S&C Circuit-Switchers - Mark V* Brain Adjustment Procedure Following Outdoor Transmission Replacement of Brain Assembly or

Rotating-Insulator Bearing I

INSTRUCTIONS For Field Adjustment

ITABLE OF CONTENTS

Section Page Number Section Page Number INTRODlJCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . l LATCH-GAP MEASIJREMENT AND ADJUSTMENT . . . . . . . .9 OVERTRAVEL MEASIJREMENT AND ADJUSTMENT . . . . . . .2

I

INTRODUCTION I

The equipment covered by this publication must be inspected 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.

overtravel of the interrupting rod arm and the main rod arm. Attainment of these two interrelated conditions is necessary to ensure proper seating of the rod arm latches, as well as correctly sequenced operation of the interrupting rod and the main rod.

Proper latch-gap adjustment will also be checked and, if necessary, adjusted. Attainment of proper latch gap is essential for close interpole tripping simultaneity, and to ensure that the circuit is cleared within the interrupters before the disconnect current-carrying contacts separate.

These instructions are for field adjustment of the brains on S&C Mark V Circuit-Switchers. This procedure is Before proceeding with the brain adjustment

recommended only if a pole-unit has been disassembled procedure, the pole-unit must be reassembled and to replace a brain assembly or a rotating-insulator readjusted in accordance with the field assembly and bearing. adjustment instruction sheet originally furnished with

In the steps which follow, the brain will be checked the device.

and, if necessary, adjusted to obtain adequate

* The ~nstructlons contamed hereln are also applicable to Mark 111 and Mark IV C~rcu~t-Sw~tchers

New Publlcatton @1991

INSTRUCTION SHEET 7 1 1 S&C ELECTRIC COMPANY Chicago Page 1 of 13 S&C ELECTRIC CANADA LTD. Toronto June 17,1991

S&C Circuit-Switchers - Mark VOutdoor Transmission

Brain Adjustment Procedure FollowingReplacement of Brain Assembly orRotating-Insulator Bearing

OVERTRAVEL MEASUREMENT AND ADJUSTMENTI

Normal system practices must be followed to ensurethat the high-voltage switch is de-energized, isolatedfrom high-voltage sources, and grounded at all sixterminals before proceeding with the work de-scribed below.

Step 1After following the user’s standard procedures forclearing and tagging equipment on which work is tobe performed, open the switch by pressing the “OPEN”pushbutton on the switch 0perator.A

Step 2

operator.

With the disconnect in the fully open position, removethe fuseholder for the motor circuit and (if applicable)the fuseholder for the shunt-trip circuit from the switch

step 3At the brain of the pole-unit which had been previouslydisassembled, remove the four 3/“-l 6 X 1 I/q” hex-headstainless-steel cap screws (two of which are specialshoulder bolts) from the brain cover. See Figure 1.Retain the screws.

For shunt-trip-equipped Circuit-Switchers only:Slide down the silicone-rubber weather-sealing boot toexpose the shunt-trip operating shaft tongue-and-groove joint.

Use a small screwdriver, if necessary, to pry the braincover loose, but be careful not to damage the internalO-ring seal. On shunt-trip-equipped Circuit-Switchersit will be necessary to rotate the cover counterclockwiseto disengage it from the shunt-trip operating shaft.

A

w&g diagram-for the cor&t terminal designations.)

Open close pushbuttons are not mcluded on swtch operators specifiedwth Catalog Number Suffix “-J.” In such instances, momentarily jumperterminals 1 and 8 to open the Cuvut-Switcher. (Termmal designationsmay differ rn special wiring diagrams. In such cases, refer to the specific

Locating pin /

wr -16X1%” hex-/ ’ 1

head stainless-steelcap screws

Disconnect fullv 013en

.- -Brain cover

Figure 1. Removing brain cover. Shunt-trip equipped Vertical-Break Style Circuit-Switcher shown.

expose shunt-trip

jolint

Int-trio operating shaft

7 11.662 INSTRUCTION SHEETPage 2 of 13June 17,199l

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

OVERTRAVEL MEASUREMENT AND ADJUSTMENT - Continued I

Step 4

To prevent serious injury to hands resulting frominadvertent tripping, do not make an interrupting-rod-arm measurement unless the disconnect is ator near its fully open position, as shown in Figure 2.

After ensuring that the brain is in the correct positionin accordance with the above warning, insert a 6-inchscale into the brain housing. Position it so that its right-hand edge touches the base of the aluminum inter-rupting rod nut, and read the relative position of theinterrupting rod arm on the scale. See Figure 2. Recordthis reading. Now remove the scale and take yourhands out of the brain housing!

Slowly crank the manual operating handle a maxi-mum of 1% turns in the closing direction. Insert thescale again and read the relative position of the inter-rupting rod arm on the scale. Record this reading. Nowremove the scale and take your hands out of the brainhousing!

The difference between these readings represents theinterrupting-rod-arm overtravel, and should be ‘/s inchminimum, 7/3z inch maximum. If the difference is withinthe specified range, proceed to Step 5. If the differenceis not within the specified range, overtravel adjustmentis required . . . Proceed to Step 6 for Vertical-BreakStyle and Integer Style Circuit-Switchers; proceed toStep 7 for Center-Break Style Circuit-Switchers.

rod nut To prevent serious injury tohands resulting from inad-vertent tripping, do not makean interrupting-rod-armmeasurement unless the dis-connect is at or near its fullyopen position, as shown.

I /Ic

Position 2 + c Position

r W min, 7f22” max -IIc-

INSTRUCTION SHEET 71 l-662q S&C ELECTRIC COMPANY 0 ChicagoS&C ELECTRIC CANADA LTD. l Toronto

Page 3,of 13June 17,f991

S&C Circuit-Switchers - Mark V

I

Brain Adjustment Procedure FollowingOutdoor Transmission Replacement of Brain Assembly or

Rotating-Insulator Bearing

1 OVERTRAVEL MEASUREMENT AND ADJUSTMENT - Continued I

Step 5

To prevent serious injury to hands resulting frominadvertent tripping, do not make a main-rod-armmeasurement unless the disconnect is at or nearits fully open position, as shown in Figure 3.

Crank the manual operating handle back to the fullyopen position. After ensuring that the brain is in thecorrect position in accordance with the abovewarning, insert the scale back into the brain housing,position it so that its right-hand edge touches the baseof the aluminum main rod nut, and read the relativeposition of the main rod arm on the scale. See Figure 3.Record this reading. Now remove the scale and takeyour hands out of the brain housing!

\ Mair

Slowly crank the manual operating handle amaximum of 1% turns in the closing direction. Insertthe scale again and read the relative position of themain rod arm on the scale. Record this reading. Nowremove the scale and take your hands out of the brainhousing!

The difference between these readings represents themain-rod-arm overtravel, and should be l/s inchminimum, T/X? inch maximum. If the difference is withinthe specified range, proceed to “LATCH-GAP MEA-SUREMENT AND ADJUSTMENT” on page 9. If thedifference is not within the specified range, overtraveladjustment is required . . . Proceed to Step 6 forVertical-Break Style and Integer Style Circuit-Switchers;proceed to Step 7 for Center-Break Style Circuit-Switchers.

- Main rod nut

J

Disconnect at or nearfully open position

rod arm

B-inch scale. Right-hand edge ”of scale touches base of main I

To prevent serious injury tohands resulting from inad-vertent tripping, do not makea main-rod-arm measure-ment unless the disconnectis at or near its fully openposition, as shown.

6-inch scale

Figure 3. Main-rod-arm measurement. Vertical-Break Style Circuit&uitcher shown.

/Y Position 2

T

Position

%” min, l/32” max

7 1+662 INSTRUCTION SHEETPage4of 13June 17,199l

S&C ELECTRIC COMPANY l Chicago -S&C ELECTRIC CANADA LTD. l Toronto q

OVERTRAVEL MEASUREMENT AND ADJUSTMENT - Continued

Step 6If overtravel adjustment is required on a Vertical-BreakStyle or Integer Style Circuit-Switcher perform thefollowing:(a) Crank the switch fully closed. Then slowly turn the

manual operating handle just until all threeinterrupters are heard to trip.

(b) Continue to slowly turn the manual operatinghandle a few more degrees--just to the point atwhich the disconnect current-carrying tonguecontacts disengage their respective current-

carrying jaw contacts. See Figure 4. With thedisconnect in this position, draw a verticalpositioning mark across the brain mounting flangeand the rotating insulator cap. See Figure 5.

(c) Loosen the four %“- 13 X 1 l/q” hex-head galvanizedsteel cap screws (on switches rated 34.5 kv through69 kv) or the four 5/s”-1 1 X 1 l/q” hex-head galvanizedsteel cap screws (on switches rated 115 kv through161 kv) which attach the brain mounting flangeto the rotating insulator cap. See Figure 5.

m D i s c o n n e c tI/ Ii

Figure 4. Position of disconnect requiredI for performing overtravel adjustment on Vertical-Break Style or Integer StyleCircuit-Switcher. Also position of disconnect required for performing latch-gap adjustment on Vertical-Break Style or IntegerStyle Mark V or Mark IV Circuit-Switcher.

Current-carryingtongue contacts

Current-carryingjaw contacts

INSTRUCTION SHEET 7 4 l&62S&C ELECTRIC COMPANY l ChicagoS&C ELECTRIC CANADA LTD. l Toronto

111 WV-Page 5 of 13

June IT,1991

S&C Circuit-Switchers - Mark V

I

Brain Adjustment Procedure FollowingOutdoor Transmission Replacement of Brain Assembly or

Rotating-insulator Bearing

OVERTRAVEL MEASUREMENT AND ADJUSTMENT - Continued I

(d) To increase overtravel: Pull the disconnect upslightly-the brain mounting flange will rotatecounterclockwise with respect to the rotatinginsulator cap. To decrease overtravel: Push thedisconnect down slightly-the brain mountingflange will rotate clockwise with respect to therotating insulator cap.

(e) Securely tighten the cap screws which attach thebrain mounting flange to the rotating insulator cap.

(f) Repeat Step 4 until the difference between theinterrupting-rod-arm measurements is within thespecified range and/or repeat Step 5 until thedifference between the main-arm-rod measure-ments is within the specified range. Then proceedto “LATCH-GAP MEASUREMENT AND ADJUST-MENT” on page 9.

Discbnnect with current-carrying tongue contactspositioned as shown inFigure 4

34.5 kv through 69 kv:112”- 13 X 1%” hex-headgalvanized steel cap screws

115 kv through 161 kv:5/i’-1 1 X 1%” hex-headgalvanized steel cap screws

Brain mounting flange y

Positioning mark

Rotating insulator cap

-Figure 5. Overtravel adjustment on Vertical-Break Style or Integer style Crrcuir-swucner.

7 1 l-662 INSTRUCTION SHEETPage 6 of 13 S&C ELECTRIC COMPANY . ChicagoJune 17,199l S&C ELECTRIC CANADA LTD. l Toronto

OVERTRAVEL MEASUREMENT AND ADJUSTMENT - Continued I

Step 7If overtravel adjustment is required on a Center-BreakStyle Circuit-Switcher, perform the following:(a) Crank the switch fully closed. Then slowly turn the

manual operating handle just until all threeinterrupters are heard to trip.

(b) Continue to slowly turn the manual operatinghandle a few more degrees-just to the point at

which the current-carrying tongue contacts on theterminal-end blade assemblies disengage thecurrent-carrying jaw contacts on the interrupter-end blade assemblies. See Figure 6. With the discon-nect in this position, remove the four 5/16”-i8X3/qnhex-head stainless-steel cap screws and lock-washers which attach the linkage cover to the topof the brain housing. See Figure 6. Retain the screws.

_ Current-carryingjaw contacts 5h”-18X%” hex-head

cap screws

- Linkagecover

Figure 6. Position of disconnect required for performing overtravel adjustment on Center-Break Style Circuit-Switcher.Also position of disconnect required for performing latch-gap adjustment on Center-Break Style Mark V or Mark IV Circuit-Switcher.

INSTRUCTION SHEET 71 lm662S&C ELECTRIC COMPANY l ChicagoS&C ELECTRIC CANADA LTD. l Toronto

Page)7 of 13June 17,lggl

S&C Circuit-Switchers - Mark V

I

Brain Adjustment Procedure FollowingOutdoor Transmission Replacement of Brain Assembly or

Rotating-Insulator Bearing

OVERTRAVEL MEASUREMENT AND ADJUSTMENT - Continued 1(c) To increase overtravel: Loosen the locking nuts on

the drive link and increase the effective length ofthe drive link by turning it one turn in the directionshown in Figure 7 ( top inset) . To decreaseovertravel: Loosen the locking nuts on the drivelink and decrease the effective length of the drivelink by turning it one turn in the direction shownin Figure 7 (bottom inset).

the linkage cover to the top of the brain housing,and securely tighten the four s/16”---1SXW hex-head stainless-steel cap screws. Proceed to“LATCH-GAP MEASUREMENT AND ADJUST-MENT” on page 9.

(d) Repeat Step 4 until the difference between theinterrupting-rod-arm measurements is within thespecified range and/or repeat Step 5 until thedifference between the main-arm-rod measure-ments is within the specified range. Then securelytighten the locking nuts on the drive link, replace

I-

r Locking nuts

Figure 7. Overtravel adjustment on Center-Break Style Circuit-Switcher.

To increase overtravel, turn one turnin direction shown.

I To decrease overtravel, turn one IUrnin direction shown.

7 1 l-662 INSTRUCTION SHEETPage 8 of 13 S&C ELECTRIC COMPANY l ChicagoJune 17,199l S&C ELECTRIC CANADA LTD. l Toronto

I LATCH-GAP MEASUREMENT AND ADJUSTMENT I

For latch-gap measurement and adjustment instruc- tions for 69-kv single-gap Mark V, Mark IV, or Mark I11 Circuit-Switchers in ungrounded capacitor- switching applications only, disregard Steps 8 through 16 which follow, and instead refer to S&C Instruction Sheet 711-515.

Step 8 Close the switch by cranking the manual operating handle.

Step 9 Slowly crank the manual operating handle and listen for simultaneity of tripping of the interrupters. From the point at which one interrupter trips, no more than 40 degrees of rotation should be required before the other two interrupters trip. If no more than 40 degrees of rotation are required, proceed to Step 15. If excessive

rotation is required, however, latch-gap adjustment is necessary. . . Proceed to Step 10 (for Mark V and Mark IV Circuit-Switchers) or Step 11 (for Mark 111 Circuit-Switchers).

Step 10 For Mark V and Mark IV Circuit-Switchers only: Use the manual operating handle to fully open and then reclose the switch. Now slowly turn the manual operating handle, just until all three interrupters are heard to trip. Note which interrupter is the last to trip.

On Vertical-Break Style or Integer Style Mark V and Mark IVCircuit-Switchers: Continue to slowly turn the manual operating handle a few more degrees-just to the point at which the disconnect currentcarrying tongue contacts disengage their respective current- carryingjaw contacts; see Figure 4. On Center-Break

INSTRUCTION SHEET 7 1 1-662 S&C ELECTRIC COMPANY Chicago Page 9 of 13 S&C ELECTRIC CANADA LTD. Toronto June 17,1991

S&C Circuit-Switchers - Mark V

I

Brain Adjustment Procedure FollowingOutdoor Transmission Replacement of Brain Assembly or

Rotating-Insulator Bearing

LATCH-GAP MEASUREMENT AND ADJUSTMENT - Continued I

Style Mark V and Mark IV Circuit-Switchers: Continueto slowly turn the manual operating handle a few moredegrees--just to thepoint at which thecurrentcarryingtongue contacts on the terminal-end blade assembliesdisengage the current-carrying jaw-contacts on theinterrupter-end blade assemblies; see Figure 6.

On shunt-trip-equipped Mark V and Mark IV Circuit-Switchers, slide down the silicone-rubber weather-sealing boot to expose the shunt-trip operating shafttongue-and-groove joint.

With the switch in this position, remove-at thebrain of the last pole-unit to trip-the four%&--16X 1%” hex-head stainless-steel cap screws (twoof which are special shoulder bolts) from the brain trip operating shaft.cover. See Figure 8. Retain the screws. Proceed to Step 12.

Use a small screwdriver, if necessary, to pry the braincover loose, but be careful not to damage the internalO-ring seal. On shunt-trip-equipped Mark V and MarkIV Circuit-Switchers it will be necessary to rotate thecover counterclockwise to disengage it from the shunt-

Disconnect with current-carrying tongue contactspositioned as shown inFigure 4. On Center-BreakStyle Circuit-Switcher, dis-connect should be posi-tioned as shown in Fiqure 6.

cover

3/e”- 18X1%” hex-headstainless-steel cap screws

%h x IFigure 8. Removing brain cover on Vertical-Break Style or Integer Style Mark V or Mark IV Circuit-Switcher. Center-BreakStyle Mark V and Mark IV Circuit-Switchers are similar.

7 11-662 INSTRUCTION SHEETPage 10 of 13June 17,1991

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

LATCH-GAP MEASUREMENT AND ADJUSTMENT - Continued

Step 11For Mark III Circuit-Switchers only: Use the manualoperating handle to fully open and then reclose theswitch. Now slowly turn the manual operating handle,just until all three interrupters are heard to trip. Notewhich interrupter is the last to trip.

Continue to crank the manual operating handle. Withthe disconnect in the fully open position, remove-atthe brain of the last pole-unit to trip-the four3/s”- 16 X 1%” hex-head stainless-steel cap screws (twoof which may be special shoulder bolts) from the braincover. See Figure 9. Retain the screws.

On shunt-trip-equipped Mark III Circuit-Switchers,slide down the silicone-rubber weather-sealing boot toexpose the shunt-trip operating shaft tongue-and-groove joint.

Use a small screwdriver, if necessary, to pry the braincover loose, but be careful not to damage the internalO-ring seal. On shunt-trip-equipped Mark III Circuit-Switchers it will be necessary to rotate the covercounterclmkwise to disengage it from the shunt-tripoperating shaft.

Proceed to Step 13

w--f6 x 1%” her-headstafnless-sleet cap screws

I

Disconnect/fully open

Figure 9. Removing brain cover onCircuit-Switcher is similar.

Style or Integer style Circuit-swncner. bryle MarK III

INSTRUCTION SHEET 71 l-662q s&C ELECTRlC COMPANY l ChicagoS&C ELECTRIC CANADA LTD. l Toronto

Page 11 of 13June 17,199l

S&C Circuit-Switchers - Mark V

I

Brain Adjustment Procedure FollowingOutdoor Transmission Replacement of Brain Assembly or

Rotating-Insulator Bearing

1 LATCH-GAP MEASUREMENT AND ADJUSTMENT - Continued I

Step 12 socket wrench, turn the socket-head latch-gap adjustingscrew approximately ‘/z turn clockwise. See Figure 16This latch-gap adjustment will result in earlier trippingof the interrupter.

To prevent serious injury to hands resulting frominadvertent tripping, do not adjust the latch-gap Proceed to Step 14.

adjusting screw on Mark V or Mark IV Circuit-Switcher with the disconnect opened further thanshown m Figure 4 or Figure 6, smce the stored-energysprings in the brain may be charged.

For Mark Vand Mark IV Circuit-Switchers mly: Usinga G-inch Allen wrench socket (such as Snap-On ToolsCorporation Part Number FA4A) attached to a 3/&inch

Disconnect 7

To prevent serious injury tohands resulting from inadver-tent tripping, do not adjustthe latch-gap adjusting screwon Mark V or Mark IV Circuit-Switcher with the disconnectopened further than shown inFigure 4 or Figure 6 since thestored-energy springs in thebrain may be charged.

I.

I %-inch Allen wrench socketattached to %-inch socket

Figure 10. Adjusting latch gap on Vertical-Break Style or Integer Style Mark V or Mark IV Circuit-Switcher. Center-BreakMark V and Mark IV Circuit-Switchers are similar.

7 1 lm662 INSTRUCTION SHEETPage 12 of 13 S&C ELECTRIC COMPANY l ChicagoJune 17,199l S&C ELECTRIC CANADA LTD. l Toronto

LATCH-GAP MEASUREMENT AND ADJUSTMENT - ContinuedI

Step 13

To prevent serious injury to hands resulting frominadvertent tripping, do not adjust the latch-gapadjusting screw on Mark III Circuit-Switcher unlessthe disconnect is fully open, as shown in Figure 9,since the stored-energy springs in the brain maybe charged.

For Mark III Circuit-Switchers only: Using a s/u-inchAllen wrench socket (such as Snap-On Tools Corpo-ration Part Number FA6A) attached to a %-inch socketwrench, turn the socket-head latch-gap adjusting screwapproximately ‘/z turn counterclockwise. See Figure 11.This latch-gap adjustment will result in earlier trippingof the interrupter.

Step 14Repeat Steps 8,9, 10, and 12 (for Mark V and Mark IVCircuit-Switchers) or Steps 8,9,11, and 13 (for Mark III

To prevent serious injury to handsresulting from inadvertent tripping,do not adjust the latch-gap adjustingscrew on Mark III Circuit-Switcherunless the disconnect is fully opensince the stored-energy springs in thebrain may be charged.

Circuit-Switchers) until the requisite degrees ofrotation of the manual operating handle, from the pointat which one interrupter trips to the point at whichthe other two interrupters trip, is less than or equalto 40 degrees. To avoid multiple iterations of thisprocedure, don’t adjust the brains at more than twoof the pole-units.

Step 15Replace the brain cover(s) using the locating pin oneach brain housing (if furnished) as a positioning guide.See Figure 8. Be careful not to damage the O-ring seal.Secure each brain cover using W’---16X 1 l/q” hex-headstainless-steel cap screws (taking care to replace thespecial shoulder bolts-if present-in their correctpositions) and, if applicable, replace the shunt-tripoperating shaft weather-sealing boot.

Step 16Replace the fuseholder for the motor circuit and/orthe fuseholder for the shunt-trip circuit. The switchcan now be returned to service.

Latch-gapscrew

adjustil

Figure 11. Adjusting latch gap on Vertical-Break Style or Integer Style Mark III Circuit-Switcher. center-UreaK style c;ircuil-Switcher is similar.

INSTRUCTION SHEET 7 1 l-662S&C ELECTRIC COMPANY l ChicagoS&C ELECTRIC CANADA LTD. l Toronto

Page 13 of 13June 17,199l