S&C Custom Metal-Enclosed Switchgear Indoor and Outdoor ......S&C Custom Metal-Enclosed Switchgear...

S&C Custom Metal-Enclosed SwitchgearIndoor and Outdoor Distribution (4.16 kv throuclh 34.5 kv)

INSTRUCTIONSFor Installation

I TABLE 0F CONTENTS I

SectionINTRODUCTION . . . . . . .SECURITY PROVISIONS . .HOISTING . . . . . . . . . . .INSPECTION . . . . . . . . . .STORAGE . . . . . . . . . . . .ACCESS TO INTERIOR . . .PLACEMENT . . . . . . . . .

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Page Number. . . . . . . . . . 1. . . . . . . . . . 3. . . . . . . . . . 4. . . . . . . . . . 4. . . . . . . . . . 5. . . . . . . . . . 6. . . . . . . . . . 8

SectionPREPARING FOR SERVICE . . . . . . . . . . . . .ADDITIONS TO EXISTING INSTALLATIONS .TESTING . . . . . . . . . . . . . . . . . . . . . . . . .COMPONENTS . . . . . . . . . . . . . . . . . . . . .INTERLOCKS . . . . . . . . . . . . . . . . . . . . . .MAINTENANCE . . . . . . . . . . . . . . . . . . . . .SPECIFICATIONS . . . . . . . . . . . . . . . . . . .

Page Number. . . . . . . . . . 10. . . . . . . . . . 22. . . . . . . . . . 24. . . . . . . . . . 26. . . . . . . . . . 29. . . . . . . . . . 33. . . . . . . . . . 35

INTRODUCTION I

Supersedes lnstructlon Sheet 621-500 dated 2-16-61 @1992

q s&c ELECTRIC COMPANY l ChicagoS&C ELECTRIC CANADA LTD. l Toronto

INSTRUCTION SHEET 62 l-5()0 of 35

March 16,1992

S&C Custom Metal-Enclosed Switchgear Indoor and Outdoor Distribution (4.16 kv through 34.5 kv)

I INTRODUCTION - Continued I

The equipment covered by this publication must be selected for a specific application and it must be installed, operated, and maintained by qualified persons who are thoroughly trained and who understand any hazards that may be involved. This publication is written only for such qualified persons and is not intended to be a substitute for adequate training and experience in safety procedures for this type of equipment.

Each assembly of S&C Custom Metal-Enclosed Switchgear is provided with an “INSTALLATION AND OPERATION INFORMATION KIT“ located in the holder inside the switchgear-bay door on which the label “Installation and Operation Informatmn Kit Inside This Hay” 1s affixed. The “INSTALLATION AND OPERATION INFORMATION KIT” includes applicable instruction sheets covering installation of t he switchgear assembly and operation of components, plus drawings and wiring diagrams. All personnel involved with installation and operation of the switchgear assembly should be thoroughly familiar with the contents of the “INSTAL1,ATION AND OPERATION INFORMATION KIT.”

This equipment has been provided with compre- hensive access control and operating features to minimize hazards. However, since this equipment contains high voltage, there are hazards inherently present such that the following precautions should be observed at all times. FAILURE TO OBSERVE THESE PRECAUTIONS MAY RESULT IN SERIOUS INJURY OR DEATH.

1. Nonremovable, manual handles in high-voltage compartment doors and hinged-padlockable covers, as well as hinged-bolted panels, have provisions for padlocks which must be in place and secured at all times unless work is being performed inside the enclosure. Padlocks must be installed and secured on manual switch operating handles at all times unless the switch is being operated.

2. Snaplocks must be in place and the keys must be removed.

3. Key interlocks (if applicable) must be in place. Check the operating sequence of key interlocks to verify proper sequencing. After the switchgear is installed, destroy all duplicate keys or make

them accessible only to authorized persons so that the key interlock scheme will not be compromised. Key interlocks are not security locks.

4. Mechanical cable interlocks are provided to prevent access to fuses unless the switch is open and to prevent operation of stored-energy switch operators when the enclosure door is open. Do not attempt to operate any switch when the enclosure door is open. Periodically, verlfy that these interlocks are functional. Refer to the instructions under “INTERLOCKS” on pages 29 through 32.

5. Do not apply any undue force to any handle when attempting to open or close a door or cover. The use of undue force may damage the handle or latching mechanism, or an interlock mechanism may be jammed. Do not attempt to close doors in an effort to reset interlocks. Instead, follow the instructions under “INTERLOCKS” on pages 29 through 32.

6. Do not, remove or obscure any of t he “CAUTION,” “DANGER,” or o ther p recau- tionary signs and labels.

7. Make certain screens and hinged-bolted panels are bolted closed unless work is being performed inside the enclosure.

8. Make certain all switchgear enclosures are properly grounded.

9. Make certain fuses are disconnected from all power sources (including backfeed) before being inspected or replaced.

10. Test for voltage and install suitable grounding equipment before touching any device that is to be inspected, serviced, or repaired. Voltage testers suitable for this purpose are available from S&C.

11. Always assume both sets of power terminals on switch, fuse, or terminal connections to be energized unless proved otherwise by test or visual evidence.

12. Disconnect all voltage transformers and voltage sensors when external voltage is used to test any secondary-side wiring or when heaters are energized for temporary storage. Do not disconnect voltage limiters from voltage sensors when the switchgear is energized.

General gear may incorporate many types of components, such The following instructions are for installation ofmanual as interrupter switches, power fuses, switch operators, or power-operated S&C Custom Metal-Enclosed Switch- SOLlrce-tranSfer COntrOk, Voltage sensors, Current gear rated 4.16 kv through 34.5 kv. sensors, meters, etc., depending on user requirements.

These components may be manufactured by S&C or An assembly of S&C Custom Metal-Enclosed Switch-

62 1400 INSTRUCTION SHEET of 35 S&C ELECTRIC COMPANY Chicago March 16,1992 S&C ELECTRIC CANADA LTD. 0 Toronto

I INTRODUCTION - Continued

by others. “Instructions For Operation” of each S&C,- not apply 1,o S&C Custom Metal-Enclosed Switchgear manufactured component are provided in separate where fuse components ofother than S&C manufacture S&C instruction sheets. For each switchgear assembly, are used in conjunction with S&C Fuse Mountings. the applicable instruction sheets, drawings, and wiring With respect to major components, S&C’s Standard diagrams are in an envelope entitled “INSTALLATION Conditions sale provide the fo~~ouring: AND OPERATION INFORMATION KIT.” This envelope is located in a holder inside the appropriately marked switchgear-bay door. Instructions for components not of S&C manufacture are provided only when furnished by the original manufacturer.

The seller’s warranties do not apply to major components not of S&C manufacture, such as: surge arresters, current-limiting fuses, instrument transformers, relays and meters, circuit breakers, and terminators. However, seller will assign to pur-

Warranty Qualifications chaser all manufacturers’ warranties that apply to such major components.

The standard warranty contained in S&C’s Standard Conditions of Sale (as set forth in Price Sheet 160) does

SECURITY PROVISIONS ~~

I Enclosure Security S&C Custom Metal-Enclosed Switchgear incorporates many provisions to minimize hazards to qualified persons and to the general public. Each bay is fabricated from 11-gauge steel sheet and is a free-standing, self- supporting unit with an integral channel base around the four sides. With this unitized design, there are always double walls between the adjoining bays. There are no externally removable side sheets, rear sheets, or roofs to invite removal. Even provisions for future bus extension are closed with a panel that is secured internally. Access is from the front only, through wide bulkhead-type doors having concealed cam-type, high- strength latches that seal the doors shut. Each full- length door has a minimum of three concealed, extra- heavyduty hinges with stainless-steel pins. All doors and covers are padlockable and have top and side flanges with double 90bdegree bends (except hinged bolted panels), which overlap the door openings, adding rigidity and discouraging tampering.

Access Control Switch operat,ors and controls are isolated from high voltage in grounded, metal-enclosed compartments. Access to these components is controlled by padlockable covers, which incorporate a nonremovable manual handle. Other low-voltage components, such as meters, selector switches, toggle swit,ches, etc., are similarly isolated.

Flush-mounted key-operated snap locks (where furnished) plus interlocks and padlocks help control access to high-voltage compartments. A protective

screen is furnished behind doors that provide access to high-voltage components. These screens, when bolted closed, act as a second barrier to guard against inadvertent entry. Switch-operating handles arc padlockable in the open or closed positlon. On outdoor style switchgear, baffles and screens mounted inside the enclosure cover all vents, discouraging wire poking.

Since this gear is often located in areas accessible to the general public as well as authorized but unqualified persons, care must be taken to alert such persons to the presence of high voltage within the enclosure. Therefore, do not remove any of the “Caution-Keep Out-High Voltage” or “Danger-High Voltage-Qualified Persons Only” signs that have been attached to the gear. Any organization altering or removing these hazard altering slgns must assume full responsibility for such actions.

Take particular care to be sure that all screens and hinged-bolted panels are bolted closed and that all doors. handles. and covers are securely padlocked before leaving the gear unattended, even momentarily.

When optional key interlock schemes have been furnished, duplicate keys are provided for use during installation. To maintain the integrity o f the key interlock scheme, the duplicate key must be destroyed or made accessible only to authorized persons. Note: Key interlocks and snaplocks are not security locks and are not substitutes for padlocks.

INSTRUCTION SHEET 621-500 S&C ELECTRIC COMPANY Chicago of 35 S&C ELECTRIC CANADA LTD. 0 Toronto March 16,1992


HOISTING I To avoid damaging this gear when handling with an a timber between the eyebolts or slings as shown overhead hoist, observe normal recommended proce- in Detail A, Figure 1. dures as well as the following general instructions: 4. Be sure the eyebolts are screwed down to the 1. If possible, arrange hoist slings so as to distribute shoulder before lifting the gear.

the lifting forces equally on all eyebolts. See Figure 1. 5. Avoid sudden starts and stops. 2. Do not apply lifting force to any eyebolts at an angle Note: I t is not necessary to remove the eyebolts after

less than from the See Detail A, the switchgear has been installed. If the eyebolts are Figure 1. removed, however, the holes must be plugged using gal-

3. If i t is not possible to adhere to Instruction 2 , wedge vanized bolts and washers, and sealing mastic.

Use timber as shown if the lifting angle is less than 60" from horlzontal

Detail A i -r--i3 Detail B

Figure 1. Hoist-sling arrangements and door-latching-mechanism references for S&C Custom Switchgear.

I INSPECTION I All assemblies of S&C Metal-Enclosed Switchgear are etc. , may be packed separately and, insofar as fastened to wood skids for shipment as individual bays practicable, are shipped within the enclosure. or multibay units. Certain items, such as fuse compo- Examine the shipment for external evidence of nents, current sensors, surge arresters, key in te r loch damage. Check the bill of lading to make Sure that all

62 1400 INSTRUCTION SHEET of 35 S&C ELECTRIC COMPANY Chicago March 16,1992 S&C ELECTRIC CANADA LTD. Toronto

INSPECTION - Continued 1shipping skids, crates, and containers listed thereon 4. File a claim with the carrier.are received. If there is visible loss and/or damage: If concealed damage is discovered:1. Notify the delivering carrier immediately. 1. Notify the delivering carrier within 15 days of2. Ask for a carrier inspection. receipt of shipment.3. Note condition of shipment on all copies of the deliv- 2. Ask for a carrier inspection.

ery receipt. 3. File a claim with the carrier.

STORAGE I

S&C Metal-Enclosed Switchgear should preferably beinstalled in its permanent location immediately. Thespace heaters for outdoor switchgear (and indoorswitchgear if so equipped) should be activated at onceeven though the switchgear itself is not to be energizeduntil later. See Figure 2. This is especially importantfor bays containing meters and relays, which areparticularly susceptible to damage from moisture.

If the space heaters are wired to be normally servedthrough the secondary windings of voltage trans-formers located in the switchgear assembly, do notenergize the space heaters from a temporary sourceuntil the following precautionary measures havebeen taken: First, disconnect the secondary leadsor remove the secondary fuses, and remove theprimary fuses from the voltage transformers. Ifsecondary connections are disconnected, tape theends of the leads to prevent inadvertent shortcircuits or contact with the transformer secondaryterminals. Then connect the temporary source tothe space heaters. These precautionary measuresmust be taken to avoid energizing (backfeeding) theswitchgear conductors at high voltage through thevoltage transformers which could result in seriousinjury or death.

If the switchgear cannot be installed immediately,storage in a clean, warm, dry room is recommended,especially for indoor switchgear. It should be protectedagainst condensation, harmful gases, cement dust, andphysical damage.

If outdoor storage is a necessity, the following pre-cautions, at least, should be taken:

Indoor SwitchgearIf the switchgear was shipped with an outer pro-tective wrapping, this covering should be removed.Shelter the switchgear with a tent-like coveringwhich will allow adequate ventilation but prevententry of rain, snow, and contaminants through anyopenings. If the switchgear is not equipped withspace heaters, install temporaryelectric heaters (250

q S&C ELECTFtfC COMPANY l ChicagoS&C ELECTRIC CANADA LTD. l Toronto

to 500 watts per bay) to promote circulation to keepthe interior dry.

Outdoor SwitchgearIf the switchgear was shipped with an outer pro-tective wrapping, this covering should be removed.Shelter the switchgear with a tent-like coveringwhich will allow adequate ventilation but prevententry from rain, snow, and contaminants throughany openings in the switchgear. If the switchgearis to be stored for a considerable time (more thantwo weeks), connect and energize the space heatersto minimize condensation. See “DANGER,” at left.If the switchgear is to be stored, and it is impossible

to connect and energize space heaters or temporaryheaters, remove all meters, whether installed orseparately boxed, and store the meters in a clean, dryroom.

If the switchgear includes batteries, additionalstorage requirements apply. The battery charger shouldbe disconnected from the battery, the battery shouldbe charged periodically to avoid deep discharge thatwould damage the battery, and the battery should becharged for 24 hours following any extended storage.

1

Figure 2. Strip heater is behind a perforated sheath. Alsoshown, installation of the anchor clips and nuts.

INSTRUCTION SHEET 62 +500 of 35

March 16,1992

S8C Custom Metal-Enclosed Switchgear Indoor and Outdoor Distribution (4.16 kv through 34.5 kv)

I ACCESS TO INTERIOR I Acctlss to the Interior of the switchgear bays can be ohtaincd through two types of entranceways: high- \wItage compartment doors or hinged-bolted panels. In addition, hingpd-padlockable covers control access t o switch operators or other controls. See Figure 3.

To Open Exterior Doors, Covers, and Panels

": 0

I ) o n o t apply undue force to any door handle when a t t e m p t mg t o o p t a n a door. The use of undue force may damage the door handle and latching mechanism, or a n interlock may be jammed. Verify that snaplocks arc unlocked and that. opening the door i3 i n thc. wqurncc dictated by the interlock scheme pro\ided.

High-voltage compartment doors and hinged- padlockable covers employ nonremovable, padlock- at110 tnwnual handles which pivot for door and cover o1wnitrg. Most high-voltage compartment doors are s r ~ . u t ~ c l c.losed by a t Irree-point lat,ching mechanism u r d may IN. cquippcd with a key-operated snaplock, k t ~ y - o p c ~ r a t c ~ l Interlock. and: or a mechanical cable ~trrcr loc .k . 11' t t r r bay includes fuses, a mechanical 1ntvrIock is provided such that the associated switch nrust I w o p t ' n t d before the door can be opened. Do n o t operatr switclrrs unless the associated door is (.Iosrd.

To open the high-voltage compartment door or hinged-padlockable cover, simply remove the padlock from the hasp and firmly pull outward and down- ward on the handle. Ifthe high-voltage compartment door 1s equipped wlth a self-latching door holder, pull the door open until it is secured in place by the holder. Hinged-bolted panels on switchgear bays or bus ducts may include captive bolts, key-operated snaplocks and provisions for padlocks. To open these panels, remove the padlock and disengage the snaplock.

To Close Exterior Doors, Covers, and Panels

High-voltage compartment doors and hinged- padlockable covers are closed as follows. For doors, release the door holder if so equipped. Then, push doors or covers fully closed. While holding the door or cover closed, pivot the handle to engage the latches. Pull outward on the edge of the door (or cover) to veri@ that it has latched securely. A padlock should then he inserted into the hasp after the switchgear is cwergized.

0 Hinged-bolted panels are closed by pushing the panel closed to engage the snaplock and then tightening all bolts securely. Verify that the panel is fully closed and bolted. Insert a padlock into the hasp after the switchgear is energized

62 1-500 INSTRUCTION SHEET of 35 S&C ELECTRIC COMPANY Chicago March 16,1992 S&C ELECTRIC CANADA LTD. Toronto

ACCESS TO INTERIOR - Continued

Hinged-bolted panel

Hinged-padlockablecover

7High-voltage compartment door

Captive bolts

Padlockable-handlesProvisions for padlock

Figure 3. High-voltage compartment door, hinged-padlockable cover, and hinged-bolted panel.

INSTRUCTION SHEET 62 l-500m s&c ELECTRlC COMPANY l Chicago

S&C ELECTRIC CANADA LTD. l Toronto

of 35March 16, 1992

S&C Custom Metal-Enclosed SwitchgearIndoor and Outdoor Distribution (4.16 kv through 34.5 kv)

Step 1Transport the switchgear to the installat ion si teobserving the precautions given under the “HOISTING”section on page 4.

Step 2At the installation site, remove all the separately pack-aged components which were shipped within the enclo-sure and set them aside in a protected area.

Step 3Each bay of a multibay assembly is identified by anumber on the front of the bay. Proper positioning ofthe switchgear is indicated by corresponding numberson the anchor-bolt plan shown in the “CDA” drawingenclosed in the waterproof envelope labeled “INSTAI-LATION AND OPERATION INFORMATION KIT.”

On multibay assemblies shipped in individual unitsconsisting of bays, or groups of bays, the unit whoseworking clearance will be most affected by adjacentwalls or structures should be placed first.

Unbolt the unit from its skid and lift it over the anchorbolts, observing the precautions given under “HOIST-ING” on page 4. Align the channel base so that it issquare with, and centered on, the anchor bolts. Wherepower and control cables are to enter the enclosurethrough trench or conduit in the mounting pad, check

these locations for alignment with the terminating facil-ities provided in the switchgear.

If excess lengths of direct-buried cable are in placeand it is desired to feed them into the bay as the unitis being lowered, the doors must be opened (with doorholders latched; see Figure 3) to allow any excess cableto be fed over the door stiles. If the interphaseinsulating barriers are remmed to facilitate thisprocedure note their positioning to ensure correctreinstallation later. It should not be necessary toremove any end barriers.

Step 4On indoor assemblies furnished with optional dripproofor dustproof construction and on outdoor multibayassemblies, be sure to obtain a weather-tight sealbetween units by applying adhesive-backed foamgasketing tape (provided) around exposed edges androof section between adjoining units. See Figure 4(a).On outdoor switchgear, two strips of gasketing tapeare used at the top of the enclosure. See Figure 4(b).Strips of gasketing at the top of the roof section shouldbe installed the full depth of the enclosure with stripsat side edges starting below the top strips. Remove anybus-opening support straps before applying thegasketing.

(a) W

Figure 4. Applying gasketing tape ‘/a inch from edge. tndoor units with optional dustproof or dripproof construction arepictured at left. Outdoor units require two strips of gasketing tape at the top of the enclosure as pictured at right.

62 l-500 INSTRUCTION SHEET of 35 S&C ELECTRIC COMPANY l ChicagoMarch 16,1992 S&C ELECTRIC CANADA LTD. l Toronto

PLACEMENT - Continued I

Step 5Level the base, using metal shims as required. Secureeach bay to the pad with the anchor clips provided,(see Figure 2 on page 5) by tightening the anchor-boltnuts.

Make sure that the switchgear-bay doors open andclose without binding. Binding indicates enclosure dis-to r t ion which mus t be cor rec ted by add i t iona lshimming.

Apply grout at the bottom of the enclosure to prevententry of rodents, insects, or weeds. On outdoor assem-blies, it is recommended that the grouting be recessedsufficiently from the exterior exposure to permit caulk-ing with a weatherproof compound, applied with astandard caulking gun. A room-temperature vul-canizing (RTV) silicone rubber compound is recom-mended.

Figure 5. Joining units together.

On multibay assemblies shipped in individual units,align, level, anchor, check door operation, grout, andcaulk succeeding units in turn, and join units with theW-13 galvanized bolts provided. See Figure 5. Thebolts may be easily pressed through the gasketing tape.Do not attempt to draw misaligned units together withthese bolts. See Figure 6, “ALIGNMENT NOTE.”

ALIGNMENT NOTE: On multibay assemblies,avoid misalignment which may result in improperoperation of the switchgear and ineffectiveweather sealing between bays. Before installingthe switchgear, determine where shimming willbe necessary, and have the required shims onhand.

This!

Not This!

Figure 6. Alignment of multibay switchgear assemblies.

INSTRUCTION SHEET 62 11500S&C ELECTRIC COMPANY l Chicago of 35S&C ELECTRIC CANADA LTD. l Toronto March 16,1992

S&C Custom Metal-Enclosed SwitchgearIndoor and Outdoor Distribution 14.16 kv throuah 34.5 kv1\ I

PREPARING FOR SERVICE I

Step 6For Switchgear Rated 4.16 Ku or 13.8 Ku:On outdoor switchgear (as well as indoor switchgearwith optional dustproof or dripproof construction),after all bays are in place and bolted together, sidesand top edges of through-bus openings between baysshould be gasketed with the extruded rubber channelgasket supplied.

To facilitate installation of the channel gasket, installand tighten bolts and nuts at edges of through-busopenings on adjacent bays using the j/1(,” hardwareprovided. See Figure 7.

Stir the special adhesive provided until its color isthe same throughout. Cement the channel gasket inplace with the adhesive. Apply this adhesive evenlyto the two sides and top of the bus opening flange inboth bays, and to all inside surfaces of the channelgasket. After allowing the adhesive to become tacky(i.e. does not transfer to knuckle when touched), startthe channel gasket at the bottom front corner of thebus opening and, while verifying that the gasket isseated completely over the opening flange, install thegasketing at the front, top, and back of the bus opening.See Figure 8, which illustrates the last length ofgasketing being set in place at the bottom rear cornerof the bus opening.

I 4jiFigure 7. Draw edges of bus openings together, if necessary.

Install gasket-support straps (provided) at locationsalong the top of each bus opening. Each end of thestrap is to be placed against the nut on a roof-attachment bolt and secured in place with a %61fiN flatwasher and a VIB” locknut (provided). See Figure 9.Do not loosen any roof-attachment bolts.For Switchgear Rated 25 Ku or 34.5 Ku:Install and tighten bolts and nuts at edges of through-bus openings on adjacent bays using the ‘/I(<” hardwarefurnished.

On outdoor switchgear, after all bays are in placeand bolted together, install roof caps over roof flangesbetween bays and bolt in place using the hardwarefurnished. See Figure 10.

Step 7Remove (where applicable) all barrier braces andswitch-blade tie cords installed to restrain movementof these parts during shipping and handling.

Figure 8. InstaVIng rubber channel gasket in through-busopening on switchgear rated 4.16 kv or 13.8 kv. Start gasketat the bottom front corner and end (as illustrated above)at bottom rear corner.

62 l-500 INSTRUCTlON SHEET of 35March 16,1992

S&C ELECTRIC COMPANY l ChicagoSRC ELECTRIC CANADA LTD. l Toronto- - - - - - - ---_ - .

I PREPARING FOR SERVICE - Continued i

To ensure adequate electrical clearances, splice plates and hardware must be installed in the manner described and illustrated in the text and figures that follow. Failure to comply with these instructions may reduce the BIL capability of the switchgear assembly.

For switchgear equipped with insulating through bushings, semiconducting grommets must be installed on the bushings before installing splice plates. (See Figure 13.) Failure to install grommets may cause corona discharge between the bus splice plates and the bushings.

Step 8 The bus construction in S&C Custom Metal-Enclosed Switchgear is typically aluminum. Terminal pads on

5/16'' std. flat washer

5/16'' locknut

Gasket- , support strap

CUTAWAY \

TYPICAL FRONT VIEW

Figure 9. Installation of gasket-support straps in switchgear rated 4.16 kv or 13.8 kv.

S&C ELECTRIC COMPANY 0 Chicago S&C ELECTRIC CANADA LTD. Toronto

components may be aluminum, copper, or copper alloy. Hence, bus and terminal connections are typically aluminum-to-aluminum or aluminum-to-copper. Such connections employ Belleville (formed spring-steel) washers. Do not tighten factory-made connections employing Belleville washers unless they are visibly loose, since they have been correctly torqued (50 foot- pounds) at the factory.

NOTE: In cases involving copper bus construction or flexible laminated-copper connecting straps, copper- to-copper, copper-to-silver, or silver-to-silver connections may be found. These connections employ flat brass washers rather than Belleville washers (and stainless- steel or Everdur hardware instead of galvanized hardware) and shquld be torqued (35 foot-pounds) since they may have loosened during shipment. Check bus connections and where necessary, correctly tighten the connecting hardware.

CUTAWAY \

TYPICAL FRONT VIEW

Figure 10. Installation roof caps over roof flanges on outdoor switchgear rated 25 kv or 34.5 kv.

-I

INSTRUCTION SHEET 62 1 1 5 ~ of 35

March 16,1992


I PREPARING FOR SERVICE - Continued I Step 9 For aluminum bus, both the bus ends and splice plates

For the inter-unit splices in the main-bus and ground- have been pre-abraded and coated with a thin layer bus runs, splice-plate kits have been provided. These of oxidation-inhibiting grease at the factory. kits contain splice plates, bolts, nuts, washers, a sheet To ensure the highest qualityjoints the mating sur-

and instructions. be re-abraded with the abrasive paper provided and of' abrasil'e paper, a tube of Penetrox@ A compound, faces of aluminum bus ends and splice plates should

Belleville spring washers Aluminum main bus

Brass flat washers

DETAIL A for aluminum-to-

Copper main bus

SDlit lockwashe I , I

Copper splice plate (or silver-plated copper)

DETAIL B for copper-to-

Belleville spring washer Aluminum main bus

Split lockwasher

DETAIL C for copper-to- Copper splice plate (or silver-plated copper)

lgure 11. Installation of inter-unit bus splices.

62 1-500 INSTRUCTION SHEET of 35 S&C ELECTRIC COMPANY 0 Chicago March 16,1992 S&C ELECTRIC CANADA LTD. Toronto

1 PREPARING FOR SERVICE - Continued 7

immediately coated with a uniform layer of Penetrox Ajust prior to making the bolted connections.

NOTE: For copper main bus and ground bus, jointsurfaces may be silver-plated and would require nocorrosion-inhibiting compounds. Therefore, beforejoining, simply clean the surfaces with a clean dry cloth,or if necessary, with a mineral-spirits solvent. Do notuse abrasives of any kind to attempt to removediscoloration which may appear on the silver-platedsurfaces. This discoloration is characteristic of silverand does not affect the performance of the bus splice.

Figure 12. If one or two Belleville washers are used withgalvanized hardware, tighten to 50 foot-pounds; if noBelleville washers are used or if stainless-steel or Everdurhardware is used, tighten to 35 foot-pounds.

q S&C ELECTRIC COMPANY l ChicagoS&C ELECTRIC CANADA LTD. l Toronto

INSTRUCTION SHEET 62 1.500 of 35

March 16, 1992


1 PREPARING FOR SERVICE - Continued I

To facilitate installation of bus splices into throughbushings, lubricate the opening in the semiconductinggrommets with NYE Rheolube, Vaseline, liquid soap, ortalcum powder. Make up bus splices, including thosefor optional insulating through bushings, as follows(refer also to Figures 11, 12, and 13):(a) For aluminumto-aluminum bus connections:

Place the splice plate on the bottom of the endsof main bus sections, or on the side of the groundbus that faces the interior of the bay. Make up theconnections using one Belleville washer under thehead of each bolt and one Belleville washer under

Install semiconducting grommets

each nut. The bolts must be installed with the bolthead on the topside of the main bus. Bellevillewashers must be installed with the outer ring ofthe cup toward the bus. See Figures 11 (Detail A)and 12. Tighten all splice bolts and nuts to a torqueof 50 foot-pounds as indicated by a torque wrench.If a torque wrench is not available, tighten untilthe Belleville washers are flat, then back off one-half turn.

(b) For copper-to-copper bus connections (whichinclude silver-plated copper connections): Place thesplice plate on the bottom of the ends of the main

Figure 13. Installation of bus splice plates for through bushings. Exterfor view of bay Is illustrated at left. Top view atright Illustrates interior view of same bay wlth bus splice plates Inserted through semlconducting grommet of bushing.Center view at right shows splice ptates bolted in place. Bottom view at rfght Illustrates interior view of adjacent bay showingbus spice plates installed and bolted to main bus. Through bushings and 1200-ampere main bus are pictured.

62lm500 INSTRUCTION SHELr of 35March 16.1992

S&C ELECTRIC COMPANY l ChhqfoS&C ELECTRIC CANADA LTD. l Toronto IEl

I PREPARING FOR SERVICE - Continued 1 bus sections, and on the side of the ground bus that faces the interior of the bay. Make up the connections using one brass flat washer under the head of each bolt, and one brass flat washer plus one split lockwasher under each nut. The bolts must be installed with the bolt head on the topside of the main bus. See Detail B of Figure 14. Tighten all splice bolts and nuts to a torque of 35 foot-pounds as indicated by a torque wrench. If a torque wrench is not available, tighten until the split lockwasher is flat.

(c) For copper-toaluminum bus connections: Place the splice plate on the bottom of the ends of the main bus sections, and on the side of the ground bus that faces the interior of the bay. Make up the connections using one brass flat washer against the copper-bus section and one Belleville washer against the aluminum bus section. The bolts must be installed with the bolt head on the topside of the main bus. See Detail C of Figure 11. Torque the bolts to 50 foot-pounds or, in the absence of a torque wrench, tighten each bolt until the Belleville washer is flat, then back off one-half turn. Do not use lockwashers with Belleville washers.

Step 10 Make up ground connections from the ground bus (or ground pad on a single-bay assembly) to the permanent station or system ground facility. I t is recommended that cable not smaller than 1/0 copper, or equivalent, be used, and if the maximum momentary rating of the switchgear is to be realized, the equivalent of 500 kc mil of copper cable is required in either a single or multiple connection.

Step 11 If secondary and control wiring are present, all terminals should be checked for tightness. Also, connect secondary and control wiring between adjacent bays at points where “shipping splits” occur. The individual wires at terminal blocks are marked to correspond with the adjacent terminal-block marking. Connection of the secondary and control wiring should be checked with reference to the applicable “CDR” or “QCDR” wiring diagram included with the “INSTALLATION AND OPERATION INFORMATION KIT.” If connector

plugs and receptacles are used in lieu of terminal blocks at points where “shipping splits” occur, connect the mating plugs and receptacles.

step 12

Remove all temporary jumpers that have been connected across the current-transformer secondaries and remove all shorting screws from the shorting-type terminal blocks. For feeder bays equipped with voltage sensors and Type SPD Open- F’hase Detectors, shorting-type terminal blocks are also provided on the left-hand side wall of the high- voltage compartment. Store all shorting screws for future use in the holes provided in the terminal blocks. Note: Failure to remove the shorting screws will make all schemes that rely on output from the CTs or voltage sensors inoperative.

Step 13 Remove all restraining tapes and blocking from the movable elements of the meters and relays (if included), used to prevent movement of these parts during shipment. and check the elements for freedom of movement.

Relays are not set at the factoryand, therefore, must be adjusted to the proper settings.

Step 14

Switch operators and manual operating handles may be equipped with key and/or mechanical interlocks which, for example, guard against switch operation when the door of the bay containing the interrupter switch is open. Check functional operation of mechanically interlocked doors and switch-operating mechanisms. Refer to “INTER- LOCKS on pages 29 through 32. Note: Failure to check and adjust interlocks may result in personal in,jury or death.

INSTRUCTION SHEET 62 1-500 S&C ELECTRIC COMPANY Chicago of 35 S&C ELECTRIC CANADA LTD. 0 Toronto March 16, 1992


PREPARING FOR SERVICE - Continued I Key interlocks which are mounted externally, and in Step 15 which the key is retained in the operated position, are Fuse components (such as holders, fuse units, end sometimes shipped separately to prevent key breakage fittings, interrupting modules, etc.) are crated sepa- during shipment. Install such interlocks with the bolts rately. Assemble these components following the fus- provided. The key sequence of the system is indicated ing procedure described in the instruction sheet packed on the one-line diagram on the "CDA drawing. Where with the applicable fuse components. Install the fuses complex key interlock schemes are furnished, refer to in the fuse mountings following the procedures the applicable "RD" drawing. described in the S&C instruction sheet on operation,

Aluminum terminal pad

Belleville washers

Aluminum connector

DETAIL A for aluminum-toaluminum connections

Belleville washer

Aluminu terminal

tinned-copper or tinned-bronze connections

Galvanized steel or brass flat

Brass flat washer

Split

I l l washers

Copper terminal

Tinned-copper or tinned-bronze connector

DETAIL C for copper to tinned-copper or tinned-bronze

E Galvanized steel flat washer

Tinned-copper or tinned-bronze connector

Copper

Belleville washer

Aluminum * connector

DETAIL D for copper-to-aluminum connections

Terminal pad connections. See Step 17.

62 1400 INSTRUCTION SHEET of 35 S&C ELECTRIC COMPANY Chicago March 16,1992 S&C ELECTRIC CANADA LTD. Toronto

I PREPARING FOR SERVICE - Continued I which is included with the switchgear, for the particular fuse type being used. When installing fuses make certain that complete fuse closure is attained. Store spare refill units, interrupting modules, or fuse units in the container mounted on the inside of doors to bays containing fuses or fused voltage transformers.

Step 16

3 I -

To avoid personal injury or damage to interlocks, before operating any switches, close and latch the associated door, and verify that switch operation is in the sequence d ic ta ted by the key- o r mechanical-interlock scheme provided. Before proceeding with these instructions, refer to “INTERLOCKS” on pages 29 through 32.

Check operation of manually operated switches. Separate instruction sheets on manually operated interrupter switches are included in the “INSTALLA- TION k h D OPERATION INFORMATION K I T provided with the switchgear.

If the switchgear is power-operated, the switch operators and automatic control equipment may now be checked. Separate instruction sheets for the switch operator(s) and for the source-transfer control are included in the “INSTALLATION AND OPERATION INFORMATION K I T provided with the switchgear.

m \ m - I -

If high-voltage ac dielectric tests are to be performed on this switchgear, or if preliminary operational tests using an auxiliary control-voltage source are to be performed before the switchgear is energized, special precautionary measures must be taken to prevent damage to certain switchgear components or inadvertent energization of the switchgear main bus. Refer to “TESTING” on pages 24 and 25.

Step 17 After all other connections have been completed and checked, make up the medium-voltage cable terminations, following the cable-terminator manufacturer’s instructions.

” 0

For switchgear equipped with reverse-cable entrance or exit, the medium-voltage cable must be installed behind the reverse-cable bracket. These brackets are located inside the bay on the left side and caution tags installed on the brackets are to be removed following installation of’ the cable. Failure to install the cable behind the bracket may result in reduced BIL rating for the switchgear.

Where field assembled types of cable-terminating devices are used, terminations must incorporate adequate leakage distance between the exposed conductor and the stress-relief cone, across a surface of nontracking material (or a surface rendered nontracking by properly taping with a suitable material). Furthermore, to maintain the rated EHL capability of the switchgear, the following minimum clearances from energized parts (including unshielded portions of cable, such as terminator skirts) are required:

Rating, Kv Minimum Clearances

To Electrical To Insulating Nominal ‘IL Barriers (inches) Ground (inches)

4 8

1 ‘12 6 95 13 8 1 4 ‘ i 2 75 7 2

3% 3 M 60

25 125 8 1% 3 25

5 15 200 34 5 5 10% 150 34 5 3 10% 150

INSTRUCTION SHEET 62 lm50o S&C ELECTRIC COMPANY Chicago of 35 S&C ELECTRIC CANADA LTD. Toronto March 16, 1992


I PREPARING FOR SERVICE - Continued I If necessary, interphase barriers can be removed to

facilitate makeup and connection of cable terminations to switch, fuse, or bus terminals. If the interphase insulating barriers are remcuued, note their positiming to ensure correct reinstallation later.

Following the user's established system operating safety procedures , check to make cer ta in that connection of the incoming-power source(s) to the switchgear terminals is in the proper phase sequence.

When making connections, care must be used to avoid placing any intentional strain upon any switch or fuse terminal. I t is important that each cable- terminator connector be flat against the corresponding switch or fuse terminal pad, with the bolt holes in alignment. Do not use the connecting bolts to pull the cables into alignment. Failure to comply with these precautions may cause misalignment of the switch or fuse.

Before connecting the cable terminators to the terminal pads, thoroughly wire-brush aluminum contact surfaces to remove any dirt or foreign materials as well as the natural surface oxides. Immediately coat both contact surfaces, to one-half inch beyond the joint, with a uniform layer of Penetrox A.

NOTE: Copper terminals have a thin layer of silver applied to contact surfaces and the terminal surfaces must be prepared as described in the "NOTE" appearing on page 13 under Step 9.

Make up the connections as described in the following paragraphs (refer also to Figure 14):

NOTE: Torque values apply only to the %-inch hardware described and not to connectors used to secure primary leads of voltage transformers or surge arresters to the bus. (a) For aluminum terminal pads to a luminum

cmnectOTs, use %-inch aluminum or galvanized steel hardware with two Belleville washers (not furnished) as shown in Detail A of Figure 14. Torque aluminum bolts to the manufacturer's speciflca- tions. Torque steel bolts to 50 foot-pounds or, in the absence of a torque wrench, tighten each bolt until the Belleville washers are flat, then back off one-halfturn. Do not use lockwashers with Belleville washers.

(b) F m aluminum terminal pads to tinnedcqpper m tinned-bronze connectors (untinned-copper or untinned-bronze connectors are not recommended) use %-inch galvanized steel hardware, with one Belleville spring washer (not furnished) against the aluminum terminal pad and one galvanized steel flat washer against the tinned connector, as shown in Detail B of Figure 14. Torque the bolt to 50 foot-

62 l150o INSTRUCTION SHEET of 35 S&C ELECTRIC COMPANY Chicago March 16,1992 S&C ELECTRIC CANADA LTD. Toronto

I PREPARING FOR SERVICE - Continued I pounds or, in the absence of a torque wrench, tighten the bolt until the Belleville washer is flat, then back off one-half turn. Do not use lockwashers with Belleville washers.

1 For copper terminal pads to tinnedcopper or tinned-bronxe connectors use %-inch Everdur or stainless-steel hardware, with one galvanized steel or brass flat washer against each terminal and one split lockwasher under the nut as shown in Detail C of Figure 14. Torque the bolts to 35 foot-pounds or, in the absence of a torque wrench, tighten each bolt until the split lockwasher is flat.

(d) For copper terminal pads to aluminum connectors use %-inch galvanized steel hardware with one Belleville spring washer (not furnished) against the aluminum connector and one galvanized steel or brass flat washer against the copper terminal pad as shown in Detail D of Figure 14. If the Belleville washer extends beyond the edge of the aluminum connector, the positions of the Belleville washer and flat washer should be reversed, Le., place the Belleville washer against the copper terminal pad and the flat washer against the aluminum connector. Torque the bolt to 50 foot-pounds or, in the absence of a torque wrench, tighten each bolt until the Belleville washer is flat, then back off one-half turn. Do not use lockwashers with Belleville washers.

After attaching the cable terminals to the terminal pads, to maintain the short-circuit rating of the switchgear assembly secure the cable to the cable support bracket, which is provided in all bays containing Fault Fiter and all bays where the available cable space exceeds 24 inches for 4.16 kv, 30 inches for 13.8 kv, 36 inches for 25 k v , or 48 inches for 34.5 kv. Under momentary conditions, mechanical stresses caused by unsecured cables may damage switches and fuses.

Step 18 Switchgear may be equipped with one or both of two types of S&C Current Sensors. S&C Open-Gap Current Sensors (see Figure 15), which are used with the optional overcurrent lockout feature that may be furnished with S&C Type AT Source-Transfer Controls, or S&C Closed-Gap Current Sensors (see Figure 16), which are used both with the optional overcurrent lockout feature furnished with S&C Micro-AT Source- Transfer Controls and with the optional Type ZSD Overcurrent Relay. These sensors are packed separately along with a supply of plastic tie wraps, connectors. and hardware. The control-wire leads that are to be connected to the current sensors are coiled and taped to the interior side wall of the appropriate enclosure.

INSTRUCTION SHEET 62 1 1 5 ~ S&C ELECTRIC COMPANY Chicago of 35 S&C ELECTRIC CANADA LTD. 0 Toronto March 16,1992


PREPARING FOR SERVICE - Continued I

Make up control-wire-lead connections and install thecurrent sensors following the procedures in theapplicable instruction sheet and with reference to theapp l i cab le wi r ing d iagram-a l l p rov ided in the“INSTALLATION AND OPERATION INFORMATIONKIT” supplied with the switchgear. In addition, thefollowing “CAUTION” applies.

Step 21If any interphase insulating barriers were removed tofacilitate accomplishment of the preceding steps,reinstall them at this time. Take care not to damagebarriers on installation and make certain they areinstalled in the locations from which they wereremoved.

For correct functioning of the automatic controlequipment, the current sensors must be placedeither against the cable concentric-neutral groundwires (in which case the ground wires must bebrought back through the current sensor beforegrounding as shown in Figure 15(a) for S&C Open-Gap Current Sensors and Figure 16(a) for S&CClosed-Gap Current Sensors) or against the cablesemiconducting jacket (as shown in Figure 15(b)and Figure 16(b) for the respective current sensors).Also, “drain-wire” type grounds on cable termina-tors, if present, must be brought back through thecurrent sensor before grounding.

Step 19Install and connect surge arresters, if applicable.

Step 20Strip heaters are included as standard in all S&C Metal-Enclosed Switchgear designed for outdoor installation.They are also optionally available in indoor switchgearto maintain the enclosed apparatus and interior areasfree of condensation, which if allowed to accumulate,can contaminate insulation and promote corrosion.Therefore, when strip heaters are included, make surethat they are connected to an adequate poww source-and energized-before placing the switc~ear in SW-vice. See “DANGER” on page 5 and Figure 2.

62 l-500 INSTRUCTION SHEET of 35March 16,1992

Make sure that the clearances between barriers andenergized parts conform to the minimum dimen-sions specified in Step 17.

TerminatorA-----G

drain wire .i -7.

,,.( ‘L.

-.aH7’L’ .._ Concentricneutral \ -

Open-gapcurrentsensors ,

Figure 15. S&C Open-Gap Current Sensors (included withoptional overcurrent-lockout feature on S&C Type ATSource-Transfer Controls) can be placed (a) against cable’sgrounded concentric neutral or (b) against cable’ssemiconducting jacket.

S&C ELECTRIC COMPANY l ChicagoS&C ELECTRIC CANADA LTD. l Toronto

1 PREPARING FOR SERVICE - Continued 1

Step 22 Step 24Sweep floors of enclosures free of debris. Wipe barriers,insulators, bushings, terminators, switches, and fusesclean with a suitable mineral-spirits solution and drywith a clean dry cloth.

Remove all shipping tapes, “bay-number”labels, and anypolyethylene or tape from vents. Clean up anyremaining adhesive. Wipe down the exterior of t,heswitchgear with a clean damp cloth and, whenthoroughly dry, touch up any scratches and abrasions,using the touch-up primer and paint provided,observing the application instructions included on theaerosol cans.

Step 23Check functional operation of key and mechanicalinterlocks, if furnished.

To maintain the integrity of key interlock schemes,duplicate keys must be destroyed or made accessibleonly to authorized persons.

-T

,+* -- -_ c--

.Lc i%

ConcentricL neutral

--/

Terminatordrain wire

current-sensors

YI (b)

Figure 16. S&C Closed-Gap Current Sensors (included withovercurrent lockout feature of S&C Micro-AT Source-Transfer Controls and with the S&C Type ZSD OvercurrentRelay) can be placed (a) against cable-grounded concentricneutral or (b) against cable’s semiconducting jacket.

m S&C ELECTRtC COMPANY l ChicagoS&C ELECTRIC CANADA LTD. l Toronto

Before Walking Away.. .1. Check the interior of each bay for foreign

materials, tools, etc., that may have been mis-laid on high-voltage bus and supporting members.

2. Make certain that switch operators, if furnished,are coupled to interrupter switches.

3. Make certain that all selector switches on source-transfer controls, if furnishrxd, arc in thr desiredpositions.

4. Check all fuses to make certain they arc fullyclosed and latched.

5. Close and securely latch all switchgear-bay doors.6. Make certain that all interrupter switches are in

the correct positions, open or closed, as dictatedby electrical system design.

7. Make certain that all grounding means have beenremoved.

8. Padlock all door handles, switch-operatinghandles, and covers [if applicable).Additional instructions on correct positioning of

specific components for normal operation arecontained in the S&C instruction sheet for theparticular component. Refer to tl~e”INSTAl~LATIONAND OIXRATION INFORMATION KIT” providedwith the switchgear.

INSTRUCTION SHEET 62 l-500 of 35

March 16, 1992

1 ADDITIONS TO EXISTING INSTALLATIONS - Continued I

Inner Protective Barrier Not Furnished1. De-energize and properly ground the existing

switchgear following the procedures outlined in the“WARNING” on pages 34 and 35.

2. Remove the end plate from the existing bay byremoving the appropriate hardware on the insideof the bay. Also, remove the knockouts for theground bus and the bay-to-bay bolt holes. SeeFigures 20, 21, and 22. On outdoor assemblies, besure to apply gasketing between the existing unitand the new unit. See Step 4 and Figure 4 on page 8.

Figure 20. View of end plate on existing unit if innerprotective barrier is not furnished.

Figure 21. Interior view of existtng unit before removal ofend plate.

q S&C ELECTRIC COMPANY l ChicagoS&C ELECTRIC CANADA LTD. l Toronto

3. Move the new unit into place immediately adjacentto the existing end unit. Make the new unit “service-ready” by completing all the bus and cableconnections and other operations described under“PLACEMENT” and “PREPARING FOR SERVICE”(Steps 1 through 24).

4. Proceed with Step 5 of the “Inner Protective BarrierFurnished” procedure under this section.

,

ic

IFigure 22. End plate removed to accept new unit.

Figure 23. With end plate (and inner protective barrier, iffurnished) removed, gasketing installed, and bays boltedtogether, bus splices are installed.

INSTRUCTION SHEI 62 lm500 of 35

March 16,1992


I TESTING

The test procedures described below must beperformed by qualified persons who are thoroughlyexperienced with this type of equipment and withthe applicable codes and standards.

Dielectric Testing

Before performing dielectric tests, make certain thatthe high-voltage conductors are not connected (i.e.,are de-energized and properly isolated). Test forvoltage, and isolate and tag all circuits in accord-ance with established system-operating safetyprocedures. In addition, remove the primary fusesand disconnect all secondary connections from allvoltage transformers and disconnect all surgearresters.

When high-voltage ac dielectric tests are to be per-formed on switchgear incorporating S&C VoltageSensors, special precautions must be taken to prevent

damage to the voltage sensor and the S&C VoltageLimiter. These precautions include the following:1. Insert shorting screws into the shorting-type

terminal block. See Figure 24.

2. In applications involving S&C Source-TransferControls, remove the plug from the input receptaclelocated at the rear of the source-transfer controland transfer the plug to the controls shortingreceptacle; refer to the S&C instruction sheet onthe source-transfer control furnished in the“INSTALLATION AND OPERATION INFORMATIONKIT.”

These precautions should also be followed whenperforming high-voltage de dielectric tests, althoughapplication of rated dc dielectric test voltages (asspecified in the table on page 35) will not damage thevoltage sensors.

After all the dielectric tests have been completed,remove the shorting screws, and transfer the plug fromthe shorting receptacle on the source-transfer controlback to the input receptacle.

It is recommended that voltage-transformer primaryfuses not be reinstalled-nor secondary connections of

Voltage Limiter

Shorting-typeterminal block

Voltage /Limiter

Figure 24. S&C Voltage Limiter is mounted on the left wall of the high-voltage compartment in applications involving S&CSource-Transfer Controls in entrance bays (as illustrated in the photo at left) and in applications involving S&C Type SPDOpen-Phase Detectors in feeder bays. In the latter case a shorting-type terminal block is furnished (as illustrated in thephoto at right).

62 l-500 INSTRUCTION SHEET of 35 S&C ELECTRIC COMPANY. ChmMarch 16,1992 S&C ELECTRIC CANADA LTD. l Toronto

I TESTING - Continued 1 unfused voltage transformers reconnected-until just prior to final energization of the switchgear for service. Remove all grounds and reconnect all high-voltage conductors and surge arresters.

Test values which apply to S&C Indoor Voltage Sensors are given in the “SPECIFICATIONS section on page 35.

Preliminary Operational Testing Before Switchgear Is Energized If the switchgear is equipped with S&C Type AT or Micro-AT Source-Transfer Controls, S&C Type ZSD Overcurrent Relays, o r S&C Type SPD Open-Phase Detectors, instructions for preliminary operational testing are contained in the S&C instruction sheets applicable to these devices.

The following test procedures apply only to switchgear equipped with S&C custom source-transfer controls with electro-mechanical components.

If it is going to be some time before high voltage is connected to the switchgear, the user may wish to perform a preliminary checkout so as to expedite full service once high voltage is available. Operation of electro-mechanical source-transfer controls and switch operators may be checked using an auxiliary control- voltage source of the required voltage.

Thp voltage trunsformers must b p disconnected on the low-voltage side when external voltage is used to test alternating-current-powered switch operators and source-transfer controls, to avoid energizing the high-voltage conductors through the voltage transformers. Failure to do so may result in serious injury or death.

Draw out the voltage transformers completely and disconnect all secondary connections if drawout-type transformers are provided. Otherwise, remove the pr imary fuses of the vol tage t ransformers and disconnect the secondaries by removing the secondary fuses or by disconnecting the secondary connections to the transformers. If secondary connections are disconnected, tape the ends of the leads to prevent inadvertent short circuits or contact with the transformer secondary terminals.

A s a safety precaution, it is recommended in any event that all voltage-transformer fuses be completely removed and kept out until just prior to final energization of the switchgear. With unfused voltage transformers, remove the secondary connections (as described in the preceding paragraph) until installation and any tests are completed.

If the switchgear assembly includes S&C Voltage Sensors that are used in conjunction with a custom source-transfer control, special precautionary measures must be taken. To avoid damage to the SKrC Volt,age Sensor’s transformer due to inadvertent open- circuiting or removal of the burden, the voltage-sensor secondaries must be shorted at the shorting-type terminal blocks located in the switchgear bays.

After operational testing is completed, disconnect the auxiliary control-voltage source. Remove the shorting screws from the voltage-sensor secondary circuit and store the shorting screws for future use in the holes provided in the terminal block. Re-install the voltage- transformer secondary fuses and reconnect the secondary leads, where applicable.

INSTRUCTION SHEET 62 1400 S&C ELECTRIC COMPANY 0 Chicago of 35 S&C ELECTRIC CANADA LTD. Toronto March 16,1992

S&C Custom Metal-Enclosed Switchgear indoor and Outdoor Distribution (4.16 kv through 34.5 kv)

COMPONENTS I S&C Metal-Enclosed Switchgear incorporates S&Cs field-proven components for switching and protection of high-voltage power distribution circuits. These components, which are available in a variety of combinations to meet system requirements, are briefly described below. For complete instructions on these components, refer to the applicable S&C instruction sheets provided in the “INSTALLATION AND OPER- ATION INFORMATION KIT tha t is furnished with each assembly of S&C Metal-Enclosed Switchgear. The information that follows is provided for preliminary familiarization with these components.

Interrupter Switches S&C Mini-Ruptere Switches The S&C Mini-Rupter Switch is a three-pole group- operated interrupter switch. It is applied in S&C Custom Metal-Enclosed Switchgear for many of the switching duties associated with loads of up to 600 amperes at 4.16 kv and 13.8 kv , and up to 400 amperes at 25 kv.

Mini-Rupters that include a quick-make quick-make mechanism Integrally mounted on the switch frame are manually operated. Instructions on operation of these switches are contained in the S&C instruction sheets covering S&C Mini-Rupter Switches.

Mini-Rupter Switches without a quick-make quick- break mechanism mounted on the switch frame are designed only for power operation by means of S&C Switch Operators-Type MS-2 or Type MS-10. Instruc- tions for operation of these switches are contained in the S&C instruction sheet covering S&C Switch Operators--Type MS-2 and S&C Switch Operators- Type MS-10, as applicable.

S&C Alduti-Ruptere Switches The S&C Alduti-Rupter Switch is a three-pole group- operated interrupter switch. I t is applied in S&C Custom Metal-Enclosed Switchgear for the heavier switching duties commonly encountered on larger systems-those duties associated with loads ranging as high as 1200 amperes at 4.16 k v , 13.8 k v , and 34.5 kv , and 600 amperes at 25 kv.

The Alduti-Rupter may be manually operated, or power-operated by means of an S&C Switch Operator- Type AS-30. Instructions for operation of these switches are contained in the S&C instruction sheets covering S&C Alduti-Rupter Switches and, if power operated, S&C Switch Operators-Type AS-30.

Fuses S&C Power Fuses-Type SM4Z, SM-5S (with single or parallel fuses), SM-5SS, SM-20, and SM-40, or S&C Fault Fiter@ Electronic Power Fuses are applied in S&C Custom Metal-Enclosed Switchgear in combination with an S&C Interrupter Switch. Each S&C Power Fuse is equipped with a blown-fuse target, permitting positive visual check of the fuse condition without removing the fuse from its mounting.

For instructions on how to install and replace fuses, and on how to detect a blown fuse, refer to the instruction sheet on “OPERATION for the fuse type furnished.

For instructions on installation and replacement of refill units, fuse units, or interrupting modules, refer to the S&C instruction sheet that is included with each S&C Type SM Refill Unit, S&C Type SMU-20@ Fuse Unit, S&C Type SMU-40@ Fuse Unit, or S&C Fault Fiter Interrupting Module as applicable, respectively.

Switch Operators S&C Switch Operators-Type AS-30 The S&C Type AS-30 Switch Operator is designed for power operation of S&C Alduti-Rupter Switches, which include a quick-make quick-break mechanism integrally mounted on the switch frame. This switch operator provides live switching in response to supervisory control; circuit interruption for open-phase detection schemes; and automatic switching on primary-selective systems. In S&C Metal-Enclosed Switchgear, these switch operators are located in grounded compartments isolated from high voltage and are chain coupled to the interrupter switches. They charge the quick-make quick-break mechanism (located on the switch frame) to open or close the switches with the torque and speed required to achive interrupting and duty-cycle fault- closing ratings. Instructions on operation of these swit,ch operators are contained in the S&C instruction sheet on S&C Switch Operators--Type ”30.

S&C Switch Operators-Type MS-2 The S&C Type MS-2 Switch Operator, for power operation of switch-operator-driven style S&C Mini- Rupter Switches, provldes high-speed live switching in response to supervisory control; circuit interruption for open-phase detection schemes; and high-speed source transfer for critical loads. In S&C Metal-Enclosed Switchgear, the MS-2 Switch Operator is drawout- carriage mounted on a roller-track mechanism within a grounded, steel-enclosed, low-voltage compartment in the switchgear-bay stile-isolated from high voltage. This switch operator is connected to the Mini-Rupter

62 1 4 0 0 INSTRUCTION SHEET of 35 S&C ELECTRIC COMPANY Chicago March 16,1992 S&C ELECTRIC CANADA LTD. Toronto

I COMPONENTS - Continued I Switch by means of a drive-linkage assembly. The MS-2 operator provides for both automatic trip-open and trip-closed operation. I t incorporates a motor-charged quick-make quick-break stored-energy mechanism which, when solenoid tripped in response to a control signal or when manually tripped, opens and closes the Mini-Rupter Switch swiftly, positively-thus contribut- ing to Mini-Rupter’s ability to achieve fast circuit interruption and duty-cycle fault-closing ratings. Instructions on operation of these switch operators are contained in the S&C instruction sheet on S&C Switch Operators-Type MS-2.

S&C Switch Operators-Type MS-10 The S&C Type MS-10 Switch Operator, for power operation of switch-operator-driven style S&C Mini-Rupter Switches, provides high-speed live switching in response to supervisorycontrol and circuit interruption for open- phase detection schemes. In S&C Metal-Enclosed Switchgear, the MS-10 Switch Operator is of nondrawout type and is integrally mounted in the switchgear-bay stile. This switch operator is connected to the Mini-Rupter Switch by means of a drive-linkage assembly. The MS-10 operator provides for automatic trip-open operation. It incorporates a manually charged quick-make quick-break stored-energy mechanism which, when solenoid tripped in response to a control signal or when manually tripped, opens the Mini-Rupter Switch. Manual charging, of the stored- energy mechanism for opening or closing the switch is performed using a removable manual operating handle. Instructions on operation of these switch operators are contained in the S&C instruction sheet on S&C Switch Operators-Type MS-10.

Source-Transfer Controls S&C Source-Transfer Controls are used in S&C Metal- Enclosed Switchgear, in conjunction with S&C Inter- rupter Switches driven by the Type MS-2 or Type AS-30 Switch Operators, to provide for automatic source transfer for primary-selective systems. Monitoring inputs for the source-transfer controls are typically supplied from each source by two S&C Voltage Sensors and one voltage transformer. In certain applications three voltage transformers may be used.

S&C Source-Transfer Controls-Type AT The Type AT controls are of solid-state electronic design and include field programmable operating-mode selector switches, timer adjustment dials, and test switches. In S&C MetalLEnclosed Switchgear, Type AT controls are drawout-carriage mounted on telescoping support rails within a grounded, st,eel-enclosed, low- voltage compartment in the switchgear-bay stile- isolated from high voltage. Each control is pre-

S&C ELECTRIC COMPANY 0 Chicago S&C ELECTRIC CANADA LTD. 0 Toronto

engineered to provide a particular level of source- transfer automation. The Type AT-2 control is designed for use in switchgear configured for common-bus primary-selective systems. The Type AT-3 control is designed for use in switchgear configured for split-bus primary-selective systems. An adjustable burden- resistor assembly, containing secondary burdens for S&C Voltage Sensors and/or secondary fuses for voltage transformers, is an integral part of the Type AT control. Instructions on operation and adjustment of the Type AT source-transfer control and the adjustable burden- resistor assembly are contained in the S&C instruction sheets on S&C Source-Transfer Controls-Type AT-2 and S&C Source-Transfer Controls-Type AT-3, as applicable.

S&C Micro-AT Source-Transfer Controls The Micro-AT controls utilize an advanced electronic microprocessor to perform control operations, as directed by settings programmed into the device at the factory and in the field. These settings, which consist of the source-transfer controls operating characteristics and voltage-, current-, and t,ime-related operating parameters are entered into the control by means of a keypad on the front panel of the control. To simplify review of the settings, the Micro-AT controls include a liquid-crystal display (LCD). An “event,” log captures system status, control status, and operating conditions for past control operations, providing the Micro-ATwith a built-in diagnostic capability. In S&C switchgear, the Micro-AT control IS secured to the bay stile in a grounded, steel-enclosed low-voltage compartment, and is removable for access. Instructions on operation and programming of settings for this control are contained in the S&C instruction sheet on S&C Micro-AT Source-Transfer Controls.

Custom Source-Transfer Controls Custom source-transfer controls with electro- mechanical components are used in S&C Metal- Enclosed Switchgear in conjunction with S&C Inter- rupter Switches driven by the Type MS-2 or Type AS-30 Switch Operators, to provide for automatic source transfer of complex primary-selective systems, as well as other customized automatic switching schemes. In S&C Metal-Enclosed Switchgear, custom source- transfer controls may be mounted on a swing-out panel within a grounded compartment isolated from high voltage. Custom source-transfer controls are used in switchgear configured for common-bus and split-bus primary-selective systems, monitoring source conditions and initiating switching operations. Custom source-transfer controls are typically used to provide automation for systems served by more than two power

INSTRUCTION SHEET 62 1400 of 35

March 16.1992

S8C Custom Metal-Enclosed Switchgear Indoor and Outdoor Distribution (4.16 kv through 34.5 kv)

COMPONENTS - Continued I sources, or involving other complex automatic switching operations. For switchgear equipped with a custom source-transfer control, an “Operation Description” is included in the “INSTALLATION AND OPERATION INFORMATION KIT.”

Overcurrent Relays The S&C Type ZSD Overcurrent Relay is used in S&C Metal-Enclosed Switchgear-primarily in conjunction with Type MS- 10 Switch Operators in load feeder bays- to achieve three-phase isolation of the feeder circuit after a downstream fault has been cleared by the feeder fuses or the source-side protective device. The ZSD relay responds to single-phasing conditions that occur following a fault downstream of the S&C Closed-Gap Current Sensors. The current sensors are included with and provide sensing for the relay. In S&C Metal- Enclosed Switchgear, the Type ZSD Overcurrent Relay is of nondrawout type (but can be removed). I t is mounted within a grounded, steel-enclosed low-voltage compartment and the sensors are separately installed by the user in the high-voltage compartment. The ZSD is of solid-state electronic design. Control voltage for this relay is typically supplied by the switch operator’s power source. Instructions on operation and adjustment of these relays are contained in the S&C instruction sheet on S&C Type ZSD Overcurrent Relays.

Open-Phase Detectors The S&C Type SPD Open-Phase Detector, for grounded- system applications, is used in S&C Metal-Enclosed Switchgear-primarily in conjunction with Mini-Rupter Switches driven by the Type MS-10 Switch Operators in load feeder bays-to protect three-phase load circuits from open-phase conditions (such as single- phasing resulting from blown feeder fuses) occurring on upstream circuits energized at the same system voltage as the metal-enclosed switchgear. In S&C Custom Metal-Enclosed Switchgear, the Type SPD detector is typically mounted to permit drawout, but may also be fixed mounted for non drawout. When fixed mounted, the SPD is secured to the switchgear-bay stile (but can be removed for testing). Type SPD detectors are always located within a grounded, steel-enclosed low-voltage compartment-isolated from high voltage. The SPD is of solid-state electronic design and, for switchgear rated 4.16 kv through 25 k v , typically uses S&C Voltage Sensors on the load side offuses to measure line-to-ground voltages. An S&C Adjustable Burden- Resistor Assembly, which allows precise setting of the voltage sensor’s output to the level required by the SPD, is mounted adjacent to the detector within the low- voltage compartment. Instructions on operation and adjustment of these detectors and the adjustable burden-resistor assembly are contained in the S&C instruction sheet on S&C Open-Phase Detectors-me SPD.

62 1 4 0 0 INSTRUCTION SHEET of 35 March 16,1992

Open-phase detection also may be incorporated as an option in Type AT Source-Transfer Controls to protect three-phase loads from source-side open-phase conditions (such as those caused by utility-line burndown, broken conductors, single-phase switching, equipment malfunctions, or single-phasing resulting from blown source-side fuses) occurring on upstream circuits energized at the same system voltage as the metal-enclosed switchgear. Information on this option is contained in the instruction sheet for the applicable Type AT control.

Voltage Sensors The S&C Voltage Sensor produces an output voltage directly proportional to line-to-ground voltage. It has relay accuracy over an ambient temperature range of “40” F to + 160°F. In S&C Metal-Enclosed Switchgear, voltage sensors are typically used to replace apparatus insulators at the hinge end of fuses where three-phase sensing for detection of open-phase conditions is required; and at the outboard, lower terminal pads of Mini-Rupter Switches (driven by Type MS-2 Switch Operators) to provide voltage sensing for automatic source-transfer schemes. Alternately, voltage sensors are mounted separately when applied with Alduti- Rupter Switches. The voltage sensor’s Cypoxylated’” construction assures high cantilever strength, and BIL and dielectric characteristics equivalent to those of the apparatus insulator replaced. The S&C Voltage Sensor is a constant-current-output device like a current transformer, and therefore primary fusing-which is required by a voltage transformer-is eliminated. Secondaryconductors of thevoltage sensor are shielded from high voltage by switch and fuse frame channels, and are connected directly to variable burden resistors. These resistors provide for field adjustment of the voltage sensor output to the level required by automatic control devices. Instructions on adjustment of the voltage sensor’s output are included in S&C instruction sheets for the applicable associated devices, Le., S&C Source-Transfer Controls-me AT-2 or Type AT-3, S&C Micro-AT Source-Transfer Controls, and S&C Open-Phase Detectors-Type SPD.

Current Sensors When the optional overcurrent-lockout feature (which prevents a transfer operation that would close a source interrupter switch into a fault) is included with an S&C Source-Transfer Control, S&C Current Sensors are provided for attachment to the entrance cables from each source. Current sensors are also furnished with the optional Type ZSD Overcurrent Relay and are typically for attachment to feeder cables. For instructions on installation of current sensors, see Step 18 and the S&C instruction sheet on S&C Current Sensors.

S&C ELECTRIC COMPANY Chicago S&C ELECTRIC CANADA LTD. Toronto

I INTERLOCKS I

Check functional operation and adjustment of mechanical cable interlocks on doors and switch- operating mechanisms. Note: Failure to check and adjust these interlocks may result in personal injury

The switchgear assembly may include interlocks (key or mechanical) on, for example, doors, switch operators, etc. of some bays. A few typical interlock schemes, including precautionary measures that must be taken to maintain interlock integrity, are discussed below. For the types and locations of interlocks that are included on the switchgear assembly, and for operating descrip- tions of special interlocking schemes that may have

Mechanical Cable Interlocks-Operation Interrupter switches with switch operators, may include a mechanical cable interlock that blocks switch operat ion when the enclosure door is open or unlatched.

Interrupter switches with fuses, whether manually operated or power operated, may include a mechanical cable interlock that prevents opening the enclosure door when the switch is closed (preventing access to fuses) and closing the switch when the door is open or unlatched.

If mechanical cable interlocks are included, do not operate the switch unless the associated enclosure door is closed with the door latches securely engaged. Also, if the bay includes fuses, do not attempt to open the

been specified, refer to the “CDA” and “RD” drawings door unless the associated switch is open. furnished in the “INSTALLATION AND OPERATION INFORMATION KIT” with the switchgear.

For MS-2 Switch Operators, if an attempt is made to operate the switch when the enclosure door is open, the switch operator will partially discharge and become jammed.

To recover from a jammed condition, turn the “DECOUPLING INDICATOR lever on the switch operator to the right to the “DRAWOUT STOP RELEASE” position and at the same time pull on the handgrip to decouple the switch operator. It will take some force to pull the switch operator so that it is decoupled. When thus decoupled, the switch operator will immediatelyfully discharge and then will automatically recharge. Release the “DECOUPLING INDICATOR” lever and make sure

it returns to the “DECOUPLED” position. To couple the switch operator, first press the open

o r close (as appropriate) pushbutton. The switch operator will trip and automatically recharge. (This procedure returns the switch operator to the same position, i.e. switch operator open or switch operator closed, as the switch). Then, turn the “DECOUPLING INDICATOR” lever to the “DRAWOUT STOP RELEASE” position and, at the same time, push on the handgrip to move the operator fully into the enclosure. Release the “DECOUPLING INDICATOR” lever and make sure it returns to the “COUPLED” position. Close and latch the door before attempting to operate the switch.

INSTRUCTION SHEET 621-500 S&C ELECTRIC COMPANY Chicago of 35 S&C ELECTRIC CANADA LTD. Toronto March 16.1992


I INTERLOCKS - Continued I

Mechanical Cable Interlocks-Inspection and Adjustment

the switch is being exercised. Inspection and adjustment procedures for these interlocks are described

Mechanical cable interlocks should be inspected periodically for proper functioning when, for example,

Inspection and adjustment of this type interlock may require access to the interior of the bay, resulting in exposure to high voltage. Furthermore, access to the interior may require opening the switch which will interrupt power to the load. Therefore, before proceeding observe the procedures specified in the “WARNING” on pages 34 and 35 in the “MAINTENANCE” section, after which the steps below are to be completed.

SPECIAL NOTE: Do not close any power-operated switches when the associated door is open because the interlock cable may be kinked, rendering it disfunctional, and the switch operator may be stalled. To recover from a stalled condition refer to the applicable switch operator instruction sheet. Then, except where otherwise permitted, inspection of mechanical cable interlocks of power-operated switches should consist only of visual verification that the cable is not kinked and proper dimensions are malntained as detailed under “Adjustment of mechanical cable interlocks” in paragraphs 2 and 3. Inspection of mechanical cable interlocks that prevent opening the door when the switch is closed and closing the switch when the door is open (typically applied on manual and power- operated bays containing fuses): 1. For manuallg operated and power-operated

switches, with the switch closed and (if furnished) the snaplock disengaged, attempt to open the high-voltage compartment door but do not use undue force. If the door can be opened, the interlock requires adjustment as described below.

2 . For manually operated switches only, open the switch, which will interrupt power to the load. Then open the high-voltage compartment door. With the door open, use the manual switch handle and attempt to close the switch but do not use undue force. If the switch can be closed while the door is open the interlock requires adjustment as described below.

Inspection of mechanical cable interlocks that prevent opening or closing the switch when the door is open (typically applied on power-operated bays containing a switch but no fuses): 1. Open the high-voltage compartment door. 2 . With the door open, attempt to operate the switch

but do not use undue force. If the switch can be opened or closed, the interlock requires adjustment as described below.

Adjustment of mechanical cable interlocks. 1. To adjust the interlock, observe the procedures

specified in “WARNING” on pages 34 and 35 under the “MAINTENANCE”section, and open any related switches.

terminals on the switch(es) to be energized unless grounding jumpers are installed.

2. If the cable wire is kinked or bent, it must be replaced. Contact the nearest S&C Sales Office.

3. If the cable wire is not kinked or bent, verlfy that the distance from the cotter pin to the center of the wire-clamp bolt on the cam assembly is 1 5 h

(+ ’/’1(<) inch. See Figure 25(a) and (b). 4. If adjustment is necessary to obtain the correct

dimension: a. Loosen the wire-clamp bolt on the cam

assembly. b. Pull the wire cable taught, and retighten the

wire-clamp bolt to 60 inch-pounds (5 foot- pounds) while establishing the aforementioned dimension.

e. Make sure the end of the cable wire is bent 90” to prevent sl ippage during subsequent operations.

62 1-500 INSTRUCTION SHEET of 35 S&C ELECTRIC COMPANY Chicago March 16,1992 S&C ELECTRIC CANADA LTD. Toronto

~

1 INTERLOCKS - Continued ~~

1 Key Interlocks sure door unless all associated entrance switches are

open. If'such key interlocks are included, do not attempt to open the enclosure door unless t,he associated switches are open. See Figure 26 (a).

nished,duplicate" keys are provided for use during installation. To maintain the integrity of the key interlock scheme, the duplicate key must be destroyed or made accessible only to authorized persons. Note: Key interlocks are not security locks and are not a substitute for padlocks.

Entrance bays may include key interlocks that guard against opening the enclosure door unless an associated upstream or downstream device is open. If such key interlocks are included, do not attempt t o open the enclosure door unless the associated device is open.

Enclosure wall ," Enclosure door

I

Cotter pin

Cam assembly

Wire-clamp

e

Enclosure wall Enclosure door

Figure 25. Dimensions to achieve proper alignment of mechanical cable interlocks which (a) prevent switch operation when the enclosure door is open or unlatched or (b) prevent opening the enclosure door when the switch is closed and closing the switch when the door is open.

L D o o r latch link

Cable wire

Door latch

Latch bracket

/ Locking lever I Door latch link bracket

INSTRUCTION SHEET 62 1 m500 S&C ELECTRIC COMPANY Chicago of 35 S&C ELECTRIC CANADA LTD. Toronto March 16.1992


1 INTERLOCKS - ContinuedI

leling of the power sources. If such key interlocks areincluded, do not attempt to close a source interrupterswitch unless the other source interrupter switch, orbus-tic switch in split-bus configurations, is open. SeeFigure 26 (b) and (c).

Feeder interrupter switches with fuses and manuallyoperated, may include key interlocks that guard againstopening the enclosure door unless the associatedswitches are open. If such key interlocks are included,do not attempt to open the enclosure door unless theassociated switches are open.

(a) (W

Feeder interrupter switches, with or without fuses,whether manually operated or power operated by s&CSwitch Operators--Type MS-lo, may include keyinterlocks that guard against opening the enclosuredoor unless an associated upstream or downstreamdevice is open. If such key interlocks are included, donot attempt to open the enclosure door, unless theassociated device is open. See Figure 26 (d).

Use of undue force in an attempt to operate switchescontrary to the correct sequence dictated by thekey interlock scheme may damage handles orlatching mechanisms.

04Figure 26. Key interlocks (a) on compartment door to guard against opening the compartment door unless associated switchis open, (b) on manual switch-operating handle to guard against paralleling of the power soum and to guard againstopening the door unless upstream and downstream devices are open, (c) on Type MS-2 Switch Operator to guard againstparalleling of the power source, and (d) on compartment door (Type MS-10 Switch Operator shown) to guard againstopening compartment door unless associated upstream or downstream device is open.

62 11500 INSTRUCTION SHEET of 35 S&C ELECTRIC COMPANY l ChtmgoMarch 16,1992 S&C ELECTRIC CANADA LTD. * Toronto

MAINTENANCE* 1 Although only qualified persons should be permitted to operate or maintain high-voltage switchgear, this should pose no problem to the user of S&C Custom Switchgear since the equipment. rarely needs attention. Mechanical maintenance is generally not required. The only “maintenance” recommended consists of periodic cleaning and inspection of interrupter-switch, fuse, and bus-support insulators; barriers; cable-terminating devices; and louver filters (if furnished), which should be performed at intervals based on environmental conditions. Also, in the event that an outage is taken, power-operated Mini-Rupter Switches should be relubricated with an S&C-approved lubricant: NYE Rheolube 368. For power-operated switchgear, use the appropriate S&C Inspection Recommendations for Switchgear Equipped with Source-Transfer Controls to perform regular inspections. The integrity of t he enclosure finish should be checked and any scratches or chips should be touched up with the appropriate touch-up finish. Also, occasional exercising of interrupter switches, switch operators, and all automatic control equipment, as well as inspection of interlocks for correct functioning, is recommended. Specific recommendations on exercising are included in the S&C instruction sheet applicable to each component as well as in S&C inspection recommendations provided in the “INSTALLATION AND OPERATION INFORMATION

KIT” furnished with the switchgear. Following exercising of switches, verify the correct functioning of interlock schemes; refer to “INTERLOCKS’on pages 29 through 32. Fuse replacement is infrequent, because for cable systems there is no exposure to transient faults-only to rare permanent faults.

When control-source fuse replacement is required in Type MS Switch Operators or S&C Source- Transfer Controls, be sure to use only fuses as designated in the applicable switch operator instruction sheets. When bulb replacement is performed in source-transfer controls, use only designated S&C replacement bulbs. Costly damage to the switch operator or controls could result when the wrong fuse or bulb is used.

In addition, qualified persons are available promptly from an electrical contractor experienced in high voltage, or [upon prior agreement) from the serving utility.

* These recommrndat1ons may dlffrr from the uwr’s qt’ratmg and safcty procedures Where B dlscrrpancq ?xlsts. t h c users \tlould fo lk~w t l w w procedures

INSTRUCTION SHEET 62 1400 S&C ELECTRIC COMPANY Chicago of 35 S&C ELECTRIC CANADA LTD. Toronto March 16,1992

S8C Custom Metal-Enclosed Switchgear indoor and Outdoor Distribution (4.16 kv through 34.5 kv)

~~ ~ ~

1 MAINTENANCE - Continued ~~

When access to high-voltage bays is required for these purposes, it must be restricted to qualified persons only, who must observe the following procedures:

1. Adhere to prescribed safety rules at all times. 2. Disconnect the fuses, interrupter switches, power

switching equipment, their mechanisms, and any other devices from all power sources and all control sources before that device is inspected, serviced, or repaired.

3. Always assume both sets of power terminals on any interrupter switch, fuse, or terminal to be energized unless proved otherwise by test or by visual evidence of open-circuit conditions on both terminal ends.

SPECIAL WARNING: All voltage transformers and voltage sensors must be disconnected when external voltage is used to test any secondary- side wiring or devices, to avoid energizing the high- voltage conductors through the voltage transformers or sensors. Draw out the voltage transformers completely and disconnect the secondary connections if drawout-type transformers are provided. Otherwise, remove the primary fuses of the voltage transformers and disconnect the secondaries by removing the secondary fuses or by disconnecting the secondary leads. Do not disconnect the burden or the voltage limiter from the voltage sensor until the switchgear is &-energized; otherwise the voltage sensor will be damaged. For voltage sensors, the secondary leads must be shorted either by removing the plug from the input receptacle and transferring it to the shorting receptacle for applications involving Type AT Source-Transfer Controls, or by inserting screws into shorting-type terminal blocks (see Figure 24 on page 24.)

4. Test for voltage. Qualified persons should be certain that they have and know how to operate the correct test equipment for determining the voltage on both sets of power terminals for any fuse or interrupter-switch equipment.

5 . After the switchgear has been completely disconnected from all sources of power and tested, properly connect grounding leads to both sides of the equipment, that is, to the incoming and to the outgoing phases of the equipment to be maintained.

6. Install dual-purpose slide-in barriers, if furnished. If a contact on either side of a slide-in barrier is energized, do not leave the barrier in the “slide- in” position for extended periods of time. These barriers are intended for temporary use only to isolate the blades of the switch from the main contacts while work is being performed. If the barriers are left in the “slide-in” position for extended periods of time, there is the possibility of corona discharge to the barriers. Prolonged exposure to corona discharge may damage the barriers and result in a flashover.

7. Padlock and tag equipment in accordance with the user’s standard operating procedures.

8. Follow instructions supplied by the manufacturer of the equipment to be maintained or other pertinent information,

9. Make certain the switch-operating handles, operator housings, and metal enclosures are properly grounded. No equipment should be returned to service unless such grounds are properly made.

10. Inspect and, if necessary, adjust interlocks; refer to “INTERLOCKS“ on pages 29 through 32.

-Continued-

62 1 m500 INSTRUCTION SHEET of 35 S&C ELECTRIC COMPANY Chicago March 16,1992 S&C ELECTRIC CANADA LTD. Toronto

I MAINTENANCE - Continued I

NOTE: Occasionally low-voltage components may require maintenance. In the servicing or repair of space heaters, voltage-transformer secondary wiring, and any other components located in the high-voltage compartment, all of the preceding safety procedures apply. The maintenance of other low-voltage components (such as voltmeters, ammeters, relays, etc.), isolated from high-voltage bays, may be performed under the safety rules for equipment rated 600 volts or less. If maintenance is to be performed on ammeters, short-circuit the secondary connections of the associated current transformer at the shorting- type terminal block prior to removal of the ammeter. This may require access to the high-voltage compartment, in which case the foregoing procedures on page 34 apply.

When returning the equipment to service, observe the following procedures: 1. Reconnect any low-voltage terminals that may have

been disconnected when servicing the gear.

2. Withdraw any dual-purpose slide-in barriers (if furnished) from the "slide-in" position and hang them on the storage hooks.

3. Open any grounding switch, or remove other grounding means, before closing the associated interrupter switch(es).

4. Close and securely latch each switchgear-bay door before energizing the circuit or operating any switching device.

5 . Lock interrupter switches in the open or closed position as dictated by the electric power system design.

6. Padlock all doors, switch-operating handles, and covers before leaving the installation site, even momentarlly. Observe this procedure even in those cases where the gear is accessible only to qualified persons.

I SPECIFICATIONS I Dielectric Testing For the convenience of users who normally perform electrical tests on system components, appropriate withstand test values are given in the table below:

INSULATION TEST VALUES Rating, Kv

System Applied Line-to-Ground@ I Withstand, Kv I I Nom. 1 Max I Nom. I Max I 60-Hett2, Rms@ I Dc@@ I Impulse (BIL) I

29

4 8 2 4

1 50 - 80 21 9 19 9 38 34 5 125 70 60 16 7 14 4 95 50 36 9 8 8 3 L 17 0 60 27 19 2 77

~~~ ~~ ~~

~~~~~ ~~~~

@ The output voltage of s(LC Voltage Sensors. whlch may be furnlshed wlth the sw~tchgear, are nomlnally 20 volt-amperes at 120 volts, fiO hertz wlth a 720-ohm reslstlve burden connected across the output termlnals and wlth Ilne-to-ground voltage correspondlng to ratrd nomlnal system voltage applled to the hne termma1

@ Ac tests made on thls equipment after shlpmtmt hy SCLC should be conducted at no more than 075 tlmes the values shown When mak~ng ac tests, the tune duratlon for applicatlon nf t h r tcst voltage should be Ilrnlted to less than 10 seconds

@ The column headed 'Qc" LS glven as a reference only for those maklng dc tests and reprrsents \slues believed to be approprlate and approx-

values speclfied for components of thls voltage class The presence of thls imately equivalent to the correspondmy power-frequency wlthstand test

column in no way implies any requuement for a dc wlthstand test on these components

@ Dc wlthstand tests made on thls equlpment after shiprnrnt by %C should be conducted at no more than 0.75 tmes the values shown. h'hen maklng dc tests, the test voltage should be r a sed in dLscretc steps-one mlnute per step

INSTRUCTION SHEET 62 14500 S&C ELECTRIC COMPANY Chicago of 35 S&C ELECTRIC CANADA LTD. Toronto March 16,1992

S&C Custom Metal-Enclosed Switchgear Indoor and Outdoor ......S&C Custom Metal-Enclosed Switchgear...

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