TECHNICAL SPECIFICATION OF ELECTRICAL MATERIALS · 1 Set3 Pole 11kv 1954200A A B Switch (H) 2 3...

.

TECHNICAL SPECIFICATION

OF

ELECTRICAL MATERIALS

(AB SWITCH, HG FUSE AND DO FUSE)

“GROUP – I & J”

Details of require materials:

Sl No Item Description Unit Quantity

1 3 Pole 11kv 200A A B Switch (H) Set 1954

2 3 Pole 11kv 200A H.G. Fuse Set 1829




6 3 Pole 11kv 200A DO Fuse Set 625

7 2 Pole 11kv 200A DO Fuse Set 625





NB: 1. Bidders should put their authorized signature with office seal on each page of

the documents.

2. Bidders should put their offer in the Guaranteed particulars column furnished

in the tender documents.

3. Purchaser may ask to the bidder who will qualify in Techno- Commercial

evaluation of the tenders for submission of Samples for verification , if

required.

4. Purchaser reserves the right to increase or decrease the above quantities

during placement of purchase order or may cancel any item/items without

assigning any reason thereof . Dy. General Manager (C&P) NESCO, Balasore, Odisha

11 KV 200 Amp 3 Pole AB Switch

Technical Specification 01.0 Scope: -

This specification covers manufacturing testing and supply of 11KV 200 Amps 50HZ Air Break switches for outdoor installation in horizontal configuration. The switches are suitable for operation under off load conditions only and are intended for use on Distribution Sub – stations and tapping sectionalizing points of 11 KV lines.

02.0 Description of the materials: -

The 11KV A.B. Switch sets shall confirm to the following parameters: -

a. Number of poles 3 b. Number of Post insulator per pole 2nos12KVpostinsulator. c. Nominal system voltage 11KV d. Highest system voltage 12KV e. Rated frequency 50Hz f. System earthling effectively earthed. g. Rated nominal current 200 amps h. Altitude of installation Not exceeding1000M

The post insulators used in the A.B. Switches shall have the following ratings :-

a. Power frequency withstand voltage (dry) 35KV (RMS) b. Power frequency withstand voltage(wet) 35KV (RMS) c. Implies withstand voltage(dry) 75KV d. Power frequency puncture withstand 1.3

03.0 Standards: -

The AB Switch Set shall conform to the following standards: -

a. IS-9920 (Part-I to V) b. IS-2544/1973 (for porcelain post insulators) c. IS-2633, (for galvanization of ferrous parts.) or its latest amendments if any.

04.0 Insulator make: -

12KV post insulators complete with post and cap duly cemented to be used in the AB Switch Set conforming to IS-2544/1973.

The bidder shall furnish the type test certificate of the post insulators from their manufacturer for reference and scrutiny.

The bidder shall mention make, type of insulation materials, metal fittings, Creepage distance, protected Creepage distance, tensile Strength, compressing strength, torsion strength and cantilever strength.

05.0 Climatic condition: -

The A.B. Switch set shall be suitable for operation under the following climatic conditions.

a. Maximum ambient air temperature 45 o C

b. Maximum daily average air temperature 35 o C

c. Maximum yearly average ambient air temperature 30 o C d. Maximum temperature attainably by a body e. Exposed to the Sum. 50 o C

f. Minimum ambient air temperature 0 o C

g. Maximum relative humidity 100% h. Minimum number of rainy days per annum 70 i. Average number of rainy days per annum 120 j. Average annual rain fall 150cm. k. Number of months of tropical monsoon conditions 4 l. Maximum wind pressure 260Kg./mm2 m. Degree of exposure to atmospheric pollution normally n. Atmosphere. Polluted.

06.0 Other technical details: -

06.01 General: - The 11KV A.B. Switch Set shall be the gang operated rotating single air

break type having 2 post insulators per phase. The operating mechanism shall be suitable for manual operation from the ground level and shall be so designed that all the three phases shall open or close simultaneously. The Switches shall be robust in construction, easy in operation and shall be protected against over travel or staining that might adversely affect any of its parts. The required base M.S. Channel (hot dip galvanized) phase coupling rod, operation rod with intermediate guide braided with flexible electrolytic copper, tail piece of required current carrying capacity and operation mechanism with ‘ON’ & ‘OFF’ positions shall be provided. The operation rod shall be medium gage of 32mm diameter nominal bore G.I. pipe single length 6 meters. The phase coupling rod for gang operation shall be of medium gauge 25mm dia &2100 mm length nominal bore G.I. pipe. The Rating post insulators shall be provide with suitable bearing mounted on a base channel with 8mm dia thrust collar and 6mm split pin made out of stainless steel. The operating down rod shall be coupled to the spindle (minimum dia – 32mm) for gang operation through another suitable bearing by two numbers 10mm dia stainless steel bolts with double nuts. All the bearings shall be provided with grease nipple. All metal (ferrous) parts shall be galvanized an polished. The pipe shall be galvanized in accordance with IS-4736/1968.The post insulators should be fixed with the base channel using Galvanized Nuts and Bolts.

06.02. Mounting:- The A.B. Switches shall be suitable for horizontal mounting in double pole sub-station structures. MS Galvanized base Channel & base support channel should be of min. size 75x40x6 mm.

06.03. Switching Blades: - It shall be made out of electricity copper with silver plated.

The approximate size shall be 220mm X 35X 6mm. The Switch shall have such a spring mechanism so as to ensure that the speed of the opening of contact is independent of speed of manual operation.

06.04 Fixed Contacts: - The Fixed Jaw type female contacts o f s ize (70x35x6) mm shall be made of electrolytic copper (minimum 95% copper composition) duly silver coated controlled by phosphorous bronze high pressure spring housed in robust G.I. Cover. It is essential that provision shall be made in fixed female contracts to take the shock arising from the closing of move contract blade without the same being transmitted to the post insulator. The arrangement made in this regard shall be specifically shown in the drawing.

06.05 Arcing Horn: - As the switches are generally meant for isolating transmission line

and distribution transformers, suitable arcing horns shall be provided for breaking the charging current horn shall be made of 8 mm dia G.I. Rod with spring assisted operation.

06.06 Terminal Connectors: - Terminal connectors shall be robust in design. The size of

fixed connector shall be (65 X 35 X 6 mm) and size of movable connector shall be of (65 X 35) X (65 X 35) X 6mm of copper casting with uniform machine finishing duly silver plated made out of minimum 95% copper composition with 2 nos. 12mm dia holes provided with suitable brass bolts and double nuts, flat washers & 2nos.

bimetallic solder less sockets suitable up to 55 mm2 conductor. 06.07Spacing: - The minimum clearance between phases to the switch shall be

760mm. The operation down rod shall be at a transverse distance of 300mm from the outer limb of the switch. The centre spacing between two post insulators of the same phase shall be 380 mm. In the open position of the A.B. switches the moving blade shall rotate through 90 o. This shall be exhibited in the drawing.

06.08 Sample, Drawing & Literatures: - Three copies of drawings of 11KV 200 Amps. A.B. Switch shall be furnished along with the tender. Technically successful bidder is to be asked for submission of Sample for verification.

06.09 The details of construction and materials of different parts of the A.B. Switch shall clearly

be indicate in the tender and illustrative pamphlet / literature for the same shall be submitted along with the tender.

07.0 TEST & TEST CERTIFICATE: -

07.01 Type Test: - Certificate for the following type tests conducted on a prototype set of A.B.

Switch in a NABL approved test house/CPRI shall have to be submitted along with offer.

Dielectric Test (impulse and one minute were power frequency withstand voltage test.)

• Temperature rise test (for contracts and terminals)

• Shorts Time current and peak withstand current test.

• Mainly active load breaking capacity test.

• Transformer off-load breaking capacity test.

• Line charging breaking capacity test.

• Cable charging breaking test.

• Operation and mechanical endurance test.

• Mechanical strength test for post insulator, as per IS-2444/1937 shall be furnished.

• Test for galvanization of metal (ferrous) parts.

07.02 Routine /Acceptance Test: -

The inspection may be carried out by the Purchaser at any stage of manufacture. The successful bidder shall grant free access to the Purchaser’s representative at a

reasonable time when the work is in progress. The following routine tests shall have

to be conducted on each set and results are to be furnished for consideration of deputing inspecting officer for inspection and conduction testing of the materials at the works of the manufacturer. the supplier shall give fifteen days advance intimation to the Purchaser to enable him to depute his representative for witnessing the tests.

1. Power frequency voltage dry test. 2. Measurement of resistance of main circuit. 3. Tests to prove satisfactory operation. 4. Dimension Check 5. Galvanization test. 6. Operational test.

08.00 Guaranteed Technical Particulars: -

The bidder shall furnish the guaranteed technical particular duly filled in the format along with the tender.

09.0 Completeness of Equipment: -

All fittings, accessories of apparatus which may not have been specifically mentioned in this specification but which are usual or necessary in equipment of similar plat shall be deemed to be included in the specification and shall be supplied by the Tender without extra charge. All plant and equipment shall be completed in all details whether such details are mentioned in the specification or not.

11 KV 200 Amp 2 / 3 Pole AB Switch

Guaranteed Technical Particulars

Sl. No

Particulars

Requirement

Bidders offer

2 pole 3 pole

1 Maker‟s name & Address To be specified by the bidder

2 Type of Switch Rotating Type

3 Suitable for mounting Horizontal only

4 No. of Breakers per phase Single Break

5 No. of Post Insulators per

phase

2nos. of 12KV Post Insulators as per

IS:2544/73 per phase

6

(a)

Post Insulators

Maker‟s Name &

Country of Manufacture of

Post Insulator

To be specified by the bidder as per CPRI Test Report

(b) Type of cementing Original Cementing. The insulator to

be cemented with MCI (Hot dip

galvanised /Al Alloy cap and

MCI/Forged steel hot deep

galvanized pedestral) as per IS:

2544/1973

(c) Power frequency withstand

voltage (Dry)

35 KV RMS

(d) One minute Power

frequency withstand

voltage (wet)

35 KV RMS

(e) Visible discharge voltage 9KV RMS

(f) Dry flash over voltage 85 KV

(g) Power frequency puncture

withstand voltage

1.3 times of actual dry flash over voltage

(h) Creapage distance 320 mm minimum (ISS-2544/1973 & relevant IEC)

(7) Impulse withstand

voltage for positive &

negative polarity

(1.2/50 micro second wave)

(a) Across the isolating distance

85KV Peak

(b) To earth & between poles 75KV Peak

8 Rated one minute

Power frequency

withstand voltage

(a) Across the Isolating

distance

32KV(RMS)

(b) To earth & between poles 28KV(RMS)

9(a) Rated voltage nominal/

maximum

11/12KV

(b) Rated normal current and

rated frequency

200 Amps. 50hz

10 Rated short-circuit

making capacity

25KA (Peak)

11 Rated Short-time current 10KA

12 Rated peak withstand current 40KA

13 Rated mainly active load

breaking capacity

200 Amp.(RMS)

14 Rated Transformer off load

breaking capacity

6.3 Amp.(RMS)

15 Rated line charging breaking

capacity

2.5 Amp(RMS)

16 Minimum clearance

between adjacent phase

(a) Switch closed (center to

center)

760mm

(b) Switch opened (Center of

post insulator to the edge

of the blade)

380mm

17 Temperature rise The

Temperature rise should

not exceed the maximum

limit to 65o

C at an ambient

temperature not

exceeding 40oC

650C

Copper contacts silver faced

terminal of switch intended to

be conducted to external

conductor by bolts or screws

at an ambient temperature

should not exceed.

50o

C

18 Vertical clearance from

top of insulator cap to

mounting channel.

254 mm

19 Type of contact a) Self aligned high pressure jaw type fixed contacts of electrolytic copper of size

70 mm x 35mm x 6 mm duly

silver plated .Each contact

should be riveted with three

nos. copper rivets with a bunch

( minimum 3 mm thick) of

copper strips /foil each may

vary from 0.15 mm to 0.25 mm

to and total thickness of copper

foil per jaw should be 6 mm .

Jaw assembles are to be bolted

through brass bolts and nuts

with spring washer.

b) Solid rectangular blade type

moving contact of electrolytic

copper of size 35 mm X 6 mm

and length 220 mm duly silver

plated ensuring a minimum

deposit of silver 10 micron on

copper contacts or as may be

prescribed under relevant ISS /

IEC .

c) Pressure springs are to be used

in each jaw contacts should be

phosphorous bronze having

8nos. of turns X28mm heights X14.4mm diameter with 14

SWG wire .

17 Connectors:- Terminal connectors for both

movable and fixed should be of

copper flat of same size similar to

that of moving contact blades

(minimum 95% copper

composition). The fixed connector

shall of size 65 mm x 35 mm x 6 mm

and the size of movable connector

shall be size (65 X 35) X (65 X

35) X 6mm with machine finishing

duly silver plated with 2 nos. 12mm

dia holes provided with suitable

brass bolts and double nuts, flat

washers & 2nos. bimetallic solder

less sockets suitable upto 55 mm²

conductor.

18 Moving contact supporting

angle

Moving contact is to be supported by G.I angle of size 45x45x5 mm on each phase and the moving contact are to be bolted through 2 nos. stainless steel bolts and nuts with suitable stainless steel flat and spring washers.

19 Galvanization

a) Iron parts shall be hot dip

galvanized as per IS-

2633/1972.(Latest Amendment) ,

IS :2629/1985 (1st

. Revision),

b) The pipe shall be galvanized as

per IS-4736/1968.(Latest

Amendment)

20 (a)

Phase Coupling Rod 25mm nominal bore G.I. Pipe (Medium gause)

(b) Operating Rod ISI mark 32mm nominal bore G.I. Pipe (Medium gause) 6 mtr. long

Normal Outside Dia. in

mm

Wall

thickness

Max. Min.

25 mm 34.2 33.3 3.25 32 mm 49.9 42 3.25

(c) Arcing Horn 8 mm dia G.I. rod with spring assisted operation.

(d) Force of fixed contact spring 50lbs to 75 lbs

(f) Bearings 4 nos. self lubricated bearing to be provided with grease nipple including 4th bearing being a axial thrust bearing.

(g) Locking Arrangement Pad Lock and key arrangement

at both “ON & OFF” position..

(h) Earth terminal Provided at base channel at opposite ends.

(i) Copper braided flexible tapes

320mm long 2no. tin coated

copper braided flexible tape

both end seated with cupper

sheets duly punched for

fixing having minimum

weight of 450 grams per

meter without sockets.

(j) Quick break device Lever mechanism

(k) „T‟ connector The „T‟ connector provided on the channel having „Moving

Contact‟ shall be of G.I Nut &

Bolt at the bottom end to

facilitate replacement of this unit

only during requirement and

avoid entire change of the arm.

l) I-Bolt The „I-Bolt” shall be longer with 75 mm thread.

21 Supporting Channel 75mmx40mmx 6mm M.S.Channel.

(Hot dip galvanized)

22 Weight of each pole 20 Kg (Approximately) ( to be specified by bidder)

23 Detailed drawing submitted ? To be provided by bidders

N.B i) Ferrous parts shall be duly galvanized as per IS :2629/1985 (1st

. Revision),

(Amendment-2) and non-ferrous parts shall be silver plated.

ii) The G.I pipes and rods shall be galvanized as per IS:4736/1968 (1st

. Revision),

(Amendment-1) for hot-dipped zinc coating on M.S. Tube.

iii) Certificate from a Government approved laboratory regarding composition of copper in

electrolytic copper casting of materials should be submitted during inspection of materials at the

cost of tenderer.

iv) Items not covered in the G.T.P, but relevant in Design, manufacturing, quality control

& testing of materials shall be governed by the relevant IS with latest Amendment.

11 KV 200 Amp 3 Pole HG Fuse

Technical Specifications

1. SCOPE:- This specification covers the manufacture, testing and supply of 11 3 pole 200A H.G. Fuse Sets.

2. (a) The 11 KV H.G. Fuses shall be suitable for out door operation in

horizontal configuration under the climatic conditions specified. It shall be of

the following ratings:-

1 Number of Poles 3 2 No.of Insulator per Pole 2 nos. 12 KV post Insulators 3 Nominal system Voltage 11 KV 4 Highest System of Voltage 12 KV 5 Rated frequency 50 Hz 6 System Frequency Effectively earthed 7 Rated normal current 200 Amps 8 Altitudes of installation Not exceeding 1000 M.

(b) The post insulator used in the H.G. Fuse set shall have the following ratings :-

1 Power frequency withstand voltage (dry) 33 KV (RMS) 2 Power frequency withstand voltage (wet) 35 KV (RMS) 3 Impulse withstand voltage (dry) 75 KV (Peak) 4 Power frequency withstand voltage 1.3 times the actual dry

flashover voltage of the unit

3. STANDARDS :-

The H.G. Fuse set shall confirm to the following standards.

IS- 9385-1980 ( for high voltage expulsion fuses and similar fuses).

IS- 2544-1973 ( for porecelain post insulators or its latest amendments if any.). IS-

2633-1979 ( for Galvanisation of ferrous parts).

4. INSULATOR MAKE :- 12 KV post insulator complete with pedestal cap

duly cemented to be used in 11 KV H.G. Fuse sets confirming to IS-2544/1973.

5. TECHNICAL DETAILS :- The H.G. Fuses shall have adjustable arcing

horns made of solid copper rod having 7.62 mm dia. The horns shall be

fitted with screwing devices with flynuts for fixing and tightening the fuse

wire. It shall have robust terminal connectors of size 80 mm x 50 mm x 6 mm

made of copper casting (95 % minimum copper composition) duly silver plated

with two numbers of 12 mm dia brass bolts and double nuts with flat

brass washers. The connectors should be capable of connecting crimpable

conductor upto 80 Sq. mm size( ACSR/ Alloy) with bimetallic solderless

sockets. The H.G Fuse Set shall suitable for horizontal mounting on sub-

station structures. The minimum clearance between the adjacent phases of the

fuse set shall be 760 mm and the centre to centre (distance between two post

insulators of the same phase) shall be 410 mm. All metal (ferrous) parts shall be

galvanized and polished. Only 12 KV post insulator ( orginal cemented and not

pin insulators shall be used for the H.G. Fuse Set.

6. CLIMATIC CONDITIONS :- The H.G. fuse set shall be suitable for

operation under the following climatic conditions.:-

1 Maximum ambient air temperature 450 C 2 Maximum daily average air temperature 350 C

3

Maximum yearly average ambient air temperature

300 C 4 Maximum temperature attainable by a body

exposed to the sun. 500 C

5 Minimum ambient air temperature 00 C 6 Maximum relative humidity 100% 7 Average number of thunderstorm days per annum 70 days 8 Average number of rainy days per annum 120 9 Average annual rain fall. 150CM 10 Number of months of tropical monsoon conditions 4 11 Maximum wind pressure 260 Kg/mm 12 Degree of exposure to atmospheric pollution. Normally polluted

atmosphere.

7 Type Test :-

Certificate for the following type tests conducted on a prototype set of HG Fuse in a NABL approved test house/CPRI shall have to be submitted along with offer.

i) Dielectric test (impulse & one minute wet power frequency withstand voltage test.)

ii) Temperature rise test ( for terminals) iii) Mechanical strength test for the post of insulator as per IS-2544/1973 iv) Test for galvanization of metal (ferrous) parts.

8. ROUTINE/ACEPTANCE TESTS :-

The inspection may be carried out by the Purchaser at any stage of manufacture.

The successful bidder shall grant free access to the Purchaser‟s

representative at a reasonable time when the work is in progress. The following

routine tests shall have to be conducted on each set and results are to be

furnished for consideration of deputing inspecting officer for inspection and

conduction testing of the materials at the works of the manufacturer. the

supplier shall give fifteen days advance intimation to the

Purchaser to enable him to depute his representative for

witnessing the tests.

i) Power frequency voltage dry test

ii) Dimension Check

iii) Galvanisation test.

9. Guaranteed Technical Particulars :

The bidders are required to furnish the guaranteed technical particulars duly filed in

the proforma along with the bid.

10. Completeness of Equipment :

Any fittings accessories or apparatus which may not have been

specifically mentioned in this specification but which are usually necessary in

equipment of similar plant shall be deemed to be included in the

specification and shall be supplied by the bidder without extra

charge. All plant and equipment shall be complete in all details whether such

details are mentioned in the specification or not.

11. Inspection :

Routine and acceptance test shall be conducted at the place of manufacturer.

The bidders are requested to furnish details of equipments which will be used

for testing along with the bid. The bids of these manufacturers who do not

have adequate testing facilities for conducting routine and acceptance test are

liable for cancellation. The successful bidder has to furnish routine test certificate

and guarantee certificate for each consignment of materials to be inspected at

the time of offer of materials for inspection.

GUARANTEED TECHNICAL PARTICULARS OF 11 KV 200Amp.

HG Fuse ( 2 / 3 pole)

Sl.

No

Particulars

Requirement

Bidders offer

11 KV 200 Amps.2/ 3 pole H.G

Fuse.

2 Pole 3 Pole


2 Operating voltage 11 KV

3 No. of Post Insulators per phase

2 nos. of 12 KV Post Insulators per

phase as per ISS:2544/1973

4 Rated normal current &

normal frequency

200 Amp., 50 Hz

5 Vertical clearance from the top of insulator to

mounting channel

254 mm (minimum)

6 Height of the riser for carrying the horn.

150 mm from the cap top of

insulator

7

(a)

Post Insulators :

Maker‟s Name & Country of Manufacture of Post Insulator

To be specified by the bidder ( as per

CPRI Test Report).

(b) Type of cementing Original Cementing only as per IS:

2544/1973 & relevant IEC.

(c) 1 minute Power

frequency withstand

voltage (Dry)

35KV RMS

(d) 1 minute Power

frequency withstand

voltage (wet)

35KV RMS


(f) Dry flash over voltage 85 KV RMS

(g) Power frequency puncture withstand voltage

1.3 times of actual dry flash over

voltage (110 KV) .

(h) Creapage distance 320 mm (minimum). Actual

creepage distance for which type

test has been conducted is to be

supplied.

8. Impulse withstand voltage for positive & negative polarity


(a) Across the isolating distance 85KV (Peak)

(b) To earth & between poles 75KV (Peak)

9. One minute Power frequency withstand voltage

(a) Across the Isolating distance 32KV(RMS)


10 Details of Arcing Horn 1 SWG (7.62 mm) dia. solid copper rod

silver plated provided with screwing

arrangement on the fuse carrier made of

copper casting for fixing fuse wire (Total

length -635 mm). All the bolts, Nuts and

washers should be made out of Brass.

11 Riser Unit (150 mm height total)

a) Riser cum Connector made out of

copper casting (with minimum 95%

copper composition having riser size (80

mm height x30mm width x8 mm

thickness) and connector of size (80

mmx50mmx 8mm) duly silver plated

and machine finishing provided with 2

nios.12 mm dia. brass bolts and double

brass nuts with flat brass washers and 2

nos. solderless bimetallic socket per each

connector suitable upto 80

mm²conductor.

b) 100 mm height G.I Riser made of

19 mm nominal bore medium gauge G.I

pipe welded with 2 nos. of G.I flat of

30mmx5mm of both ends fixed with

10mm dia. stainless steel bolts and nuts

with flat & stainless steel spring washer.

13. Galvanization a) All ferrous parts shall be hot-

dipped Galvanized as per

IS.2633/1972 (Latest Amendment) , IS

:2629/1985 (1st

. Revision),& all non-

ferrous parts shouldbe duly electroplated

with silver.

14 Supporting Channel 75mmx40mmx6mm M.S.Channel. (Hot

dip galvanized)

15 Weight of each pole 16 Kg (Approx.)To be specified by the

Bidder


N.B i) Ferrous parts shall be duly galvanized as per IS :2629/1985(1st. Revision),


ii) Certificate from a Government approved laboratory(NABL accredited) regarding composition of copper in electrolytic copper casting of materials should be submitted during

inspection of materials at the cost of Bidder.

iii) Type Test Certificate : The type test certificate , conducted within five years , preceding to date of opening of the tender from Govt. testing laboratory (NABL accredited / CPRI) shall be

furnished.

33KV 3 Pole 200 Amp AB Switch (Horizontal Type)

Type Test: - Certificate for the following type tests conducted (within five years proceeding to the date of opening of the tender)on a prototype set of A.B. Switch in a NABL approved test house/CPRI shall have to be submitted along with offer

GUARANTEED TECHNICAL PARTICULARS Slno. Description Specified Bidder’s

Offer

1 Maker's name and Country of origin. 2 Type of Switches Rotating type only. 3 Suitable for mounting. Horizontal only.

4 Number of support post Insulator per phase

4 Nos. 22 Kv/24 Kv post Insulators per phase as per IS : 2544/1973.

5 POST INSULATOR

(a) Maker's name and Country of origin. Reputed make. All the post insulators provided shall be of same make.

(b) Type of Cementing. Original Cementing only.

(c) One minute power frequency withstand voltage dry.

95 Kv (rms)

(d) One minute power frequency withstand voltage wet.

75 Kv (rms)

(e) Visible Discharge voltage. 27 Kv (rms)

(f) Dry flash over voltage. 95 Kv.

(g) Power frequency puncture withstand voltage.

1.3 times of actual dry flash over voltage.

(h) Impulse withstand voltage (Switch in position)

170 Kv (Peak)

(i) Creepage distance. 430 mm. However, t he actual creepage d i s t a n c e f o r which type test has been conducted is to be supplied.

6 Impulse withstand voltage for positive & negative polarity (1.2/50 micro second wave)

(a) Across the Isolating distance. 195 Kv (Peak) (b) To earth and between polles 170 Kv (Peak)

7 Rated one minute power frequency withstand Voltage.

(a) Across the Isolating distance. 80 Kv (rms) (b) To earth and between polles 70 Kv (rms)

8 Rated normal current and rated frequency.

400 Amps. 50 Hz.

9 Rated short time current. 16 KA (rms) 10 Rated peak withstand current. 40 KA (Peak) 11 Rated transformer off load breaking

capacity. 6.3 A (rms)

12 Rated line charging breaking capacity. 6.3 A (rms) 13 Rated cable charging breaking capacity. 16 A (rms) 14 Minimum clearance between adjacent

phases.

(a) Switch closed (Centre to Centre) 1200 mm

(b) Switch opened (Centre of post Insulator to the edge of the blade)

640 mm

15 TEMPERATURE RISE.

The temperatyure rise should not exceed to

650C

maximum limit as specified below at an

ambient temperature not exceeding

400C.

Copper contacts silver faced terminal of switch intended to be conducted to external

conductor by bolts or screws at an

ambient temperature should not exceed

500C

16 Vertical clearance from the top of

Insulator cap to mounting channel

508 mm. Minimum.

17

Type of Contact

(a) Self-aligned, high pressure jaw type fix contacts

of electrolytic copper of size 80 x 50 x 8 mm duely

silver plated. Each contact should be rivetted with

three nos. copper rivets with a bunch ( minimum

3 mm thick) consisting of copper foils may vary

from 0.15 mm to 0.25 mm ( total thickness of

copper foil per jaw shallbe 6 mm). Jaw assembles

are to be bolted through brass bolts and nuts

with brass flat and spring washer.

(b) Solid rectangular blade type moving contact

of electrolytic copper size 220 mm x 50 mm x 8

mm duly silver plated.

(c ) Pressure springs to be used in Jaw contacts should be phosphorous bronze having 8 nos. of turns x 28 mm height x 14.4 mm dia. With 14 SWG wire (Minimum 6 nos. spring shall be used)

18

Terminal Connector.

Terminal connector for both movable and fixed should be of copper casting (minimum 95 % copper composition). The fixed connector shall be of size (80 x 50) x 8 mm and the size of the movable connector (80 x 50) x (80 x 50) x 8mm with machine finishing duely silver plated with 2 nos. 12mm dia. hole with suitable brass bolts and double nuts with brass flat washers and 2 nos. solerless bimettalic sockets per each connector suitable upto 80 mm2 conductor. The sockets shall be preferably of "USHA MARTIN" make.

19

Moving Contact supporting angle.

Movable contact is to be supported by G.I Angle of size 50 x 50 x5mm on each phase and the moving contact are to be bolted through 2 nos. stainless flat and spring washers suitably.

20 Galvanisation (a) Iron parts shall be hot-dipped galvanised as per IS :2629/1985 (1 st Revision), (Amendment-2).

(b) The G.I Pipe shall be galvanised as per IS :

4736/1968 (1 st Revision),(Amendment-1) for

Hot-dipped Zinc Coating on M.S Tubes.

21 Details of phase

(a) Coupling Rod. 25mm nominal bore G.I Pipe medium gauge.

(b) Operating Rod.

32mm nominal bore G.I Pipe medium gauge. Single length 6 mtrs. The detail dimensions of

the G.I Pipe as mentioned below :

Nominal Outside Diameter Wall thickness

Max. Min.

25mm 34.2mm 33.3mm 3.25mm

32mm 42.9mm 42mm 3.25mm

(c ) Arcing Horn. (a) 8mm dia G.I Rod with spring-assisted operation.

(d) Bearing System. One bearing shall be provided near the

Base Channel to assist in operatio.

(e) Force of fixed contact spring. 50-75 lb.

(f) Copper braided flexible tapes.

320mm length of flexible electrolytic copper tape or braided chordwith tin coated having minimum weight 450 gms/mtr. And both ends shall be cripped with copper sockets through brass bolts and nuts with brass flat washers. Two nos. of suitable copper sockets shall be used at both ends. The socket should be preferably of "DOWEL" make(catalogue o CUS/48) or equivalent USHA MARTIN make. The minimum no. of flexible wires should be 1536 of 36 SWG for each flexible chord.

(g) Quick break Device. Lever Mechanism.

(h) Bearings. 4 nos. self lubricating bearings to be provided with grease nipple including 4th bearing being a thrust bearing.

(i) Locking Arrangement. Pad locker and key arrangement at both "ON" and "OFF" position.

(j) Earth Terminal. To be provided at base channel.

(k) 'T' Connection.

The 'T' Connection provided on the channel having 'MovingContact' shall be of G.I Nut & Bolt at the bottom end to facilitate replacement of this unit only during requirement & avoid entire change of the arm.

(l) The 'I-Bolt' shall be longer with 75 mm thread. 22 Supporting Channel. 75 x 40 X6 mm M.S Channel hot-dipped galvanised. 23 Weight of each pole complete. 50 Kgs. Approximately.

N.B I) Ferrous parts shall be duly galvanised as per IS:2629/1985 (1 st Revision), (Amendment-2) and non-ferrous

II) The G.I Pipes & Rods shall be galvanised as per IS : 4736/1968 (1 st Revision),(Amendment-1) for Hot- dipped Zinc Coating on M.S Tubes.

III) Certificate from a Government approved laboratory regarding composition of copper in electrolytic copper

IV) Items not covered in the G.T.P, but relevant in Design, manufacturing, quality control & testing of

materials shall be governed by the relevant IS with latest Amendments.

V) Type Test report from CPRI or accredited NABL laboratory should be furnished. Same for insulators is to

also to be provided.

TECHNICAL SPECIFICATION OF 33 KV & 11KV 3 Pole, 400

AMP , HORIZONTAL TYPE AB SWITCH

TECHNICAL SPECIFICATIONS FOR AB SWITCH

1. SCOPE:- This specification covers manufacturing testing and supply of 3 Pole, 400 AMP, 50 Hz, Single break, 33 KV & 11 KV class Air Break switches for outdoor installations to be used at 33/11 KV Sub-stations and for incoming & outgoing Lines suitable for operation under off load conditions.

1.1 DESCRIPTION OF THE MATERIALS:-The A.B. Switch sets shall confirm to the following parameters:-

Sl.

No.

Description

Parameters of AB Switch

33 KV

11 KV

i)

Number of poles

3 ii) Number of Post insulator per pole 4 nos. 22/24 KV class 2 nos. 12 KV class

iii)

Nominal system voltage (KV)

33

11

iv)

Highest System Voltage (KV)

36

12

v)

Rated frequency

50HZ

vI)

System earthing

Effectively earthed.

vII)

Rated nominal current Amp.

400 400

viii)

Altitude of installation

Not exceeding 1000 M

The post insulators used in the A.B. Switches shall have the following ratings

Sl.

No.

Description

Parameters P.I. of AB Switches for

33 KV 11 KV

i)

Power frequency withstand voltage

(dry) KV (RMS)

95

35

ii) Power frequency withstand voltage 75 35

(wet) KV (RMS)

iii

Impulse withstand voltage (dry) KV

(Peak)

170

75

iv)

Power frequency puncture

withstand voltage

1.3 times the actual dry flashover voltage of

the unit

1.2 STANDARDS:- The AB Switch Set shall conform to the following standards:-

i) IS-9920 (Part-I to V.)

ii) IS-2544/1973 ( for porcelain post insulators)

iii) Is-2633 (for galvanization of ferrous parts.) or its latest amendments if any.

1.3 INSULATORS:-

12 KV class (for 11 KV AB Switches) and 22 KV / 24 KV class (for 33 KV AB Switches) Post Insulators complete with pedestal cap duly cemented to be used in the AB Switch Set conforming to IS-2544/1973

The bidder shall furnish the type test certificate of the post insulators from their manufacturer for reference.

The bidder shall mention make, type of insulation materials, metal fittings, Creep age distance, protected Creep age distance, tensile strength, compression strength, torsion strength and cantilever strength.

1.4 CLIMATIC CONDITIONS:-

The A.B. Switch set shall be suitable for operation under the following climatic

1.

conditions

Maximum ambient air temperature.

45 0 C

2. Maximum daily average air temperature 35 0 C

3. Maximum yearly average ambient air temperature 30 0 C

4. Maximum temperature attainable by a body exposed to the sun.

50 0 C

5. Minimum ambient air temperature 0 0 C

6. Maximum relative humidity. 100%

7. Minimum number of rainy days per annum 70

8. Average number of rainy days per annum 120

9. Average annual rain fall. 150 cm.

10. Number of months of tropical monsoon conditions 4

11. Maximum wind pressure. 260 Kg./ mm2

12. Degree of exposure to atmospheric pollution. Normally polluted atmosphere.

1.5 TECHNICAL DETAILS:-

1.5.1 The 33 KV A.B. Switch Set shall be gang operated (with double tandem pipe) single air break

outdoor type horizontal mounting having 4 nos. 22/24 KV post insulator per phase and the 11

KV A.B. Switch Set shall be gang operated single (with double tandem pipe) air break outdoor

type horizontal mounting having 2 nos. 12 KV post insulator per phase. The operating

mechanism shall be suitable for manual operation from the ground level and shall be so

designed that all the three phases shall open or close simultaneously. The Switches shall be

robust in construction, easy in operation and shall be protected against over travel or straining

that might adversely affect any of its parts. The required base M.S. Channel, phase coupling

rod, operating rod with intermediate guide braided with flexible electrolytic copper, tail

piece of required current carrying capacity and operating mechanism with ‗ON‘ & ‗OFF‘

positions shall be provided. The operating rod shall be medium gauge of 32mm diameter

nominal bore G.I. pipe single piece 6 meters. The phase coupling rod for gang operation shall

medium gauge 25mm dia nominal bore G.I. Pipe. Rotating post insulators shall be provided

with suitable bearing mounted on a base channel with 6 mm thick thrust collar and 6mm split

pin made out of stainless steel. The operating down rod shall be coupled to the spindle

(minimum dia - 32mm) for gang operation through another suitable bearing by two numbers

10mm dia through stainless steel bolts with double nuts. The post insulators should be fixed

with the base channel using Galvanized Nuts and Bolts.

All the bearings shall be provided with grease nipple. All ferrous parts shall be galvanized and

polished. The pipes shall be galvanized in accordance with IS-4736/1968.

1.5.2 Mounting: - The A.B. Switches shall be suitable for horizontal mounting in all type of sub-

station structures.

1.5.3 Switching Blades: - It shall be made out of electrolytic copper with silver plated. The

approximate size shall be 250mm x 50 x 8mm for 11 KV. The switch shall have such a spring

mechanism so as to ensure that the speed of the opening of contact is independent of speed of

manual operation

1.5.4 Fixed Contracts:- The fixed jaw type female contracts (50x8x95 )mm for 11 KV shall be made

of electrolytic copper ( minimum 95 % copper composition) duly electroplated controlled by

Phosphor bronze high pressure spring housed in robust G.I. Cover.

It is essential that provision shall be made in fixed female contracts to take the shock arising

from the closing of moving contract blade without the same being transmitted to the post

insulator. The arrangement made in this regard shall be specifically shown in the drawing.

1.5.5 Arcing Horn:- As the switches are generally meant for isolating transmission line and

distribution transformers, suitable arcing horns shall be provided for breaking the

charging current horn shall be made of 10 mm dia G.I. Rod with spring assisted

operation.

1.5.6 Terminal Connectors:- Terminal connectors shall be robust in design. The size of fixed

connector shall be ( 80 x 50 x8 mm) and size of movable connector shall be of ( 80 x50) x (

80 x 50) x 8 mm of copper casting with uniform machine finishing duly silver plated made

out of minimum 95 % copper composition with 2 nos. 12 mm dia holes provided

withsuitable brass bolts and double nuts, flat washers & 2 nos. bimetallic solderless sockets

suitable up to ACSR Panther or AAAC 232 mm2 conductor.

1.5.7 Spacing:- The minimum clearance between phase to the switch shall be 1200 mm. The

operating down rod shall be at a transverse distance of 300 mm from the outer limb of the

switch. The centre spacing between two post insulators of the same phase shall be 560 mm.

In the open position of the A.B. Switches the moving blade shall rotate through anangle of 90 0

. This shall be exhibited in the drawing.

1.5.8 Drawing & Literatures:- Drawings of each item i.e. 11 KV, 400 amp and 33 KV 400 amp, 3

Pole, single break A.B. Switch shall be furnished along with the tender.

The details of construction and materials of different parts of the A.B. Switches shall clearly

be indicated in the tender and illustrative pamphlet / literature for the same shall be

submitted along with the tender.

1.6 TESTS & TEST CERTIFICATE

1.6.1 Type Test:- Certificates for the following type tests conducted within five years

proceeding to the date of opening of tender on prototype set of A.B Switch in a Govt.

Approved Testing Laboratory preferably at CPRI, Bhopal/ Bangalore shall have to be

submitted for reference and scrutiny.

i. Impulse voltage dry test

ii. Power frequency voltage dry test

iii. Power frequency voltage wet test

iv. Temperature of resistance.

v. Measurement of resistance.

vi. Test to prove the capability of carrying the rated peak short circuit current and the rated short time current.

vii. Mainly active load breaking capacity test. viii. Transformer off-load breaking test.

ix. Line charging breaking capacity test.

x. Operation tests.

xi. Mechanical endurance test.

xii. Mechanical strength test for the post insulator as per IS-2544/1973.

xiii. Test for galvanization of metal (ferrous) parts as perm IS-2633/1973.

Besides, mechanical endurance test will have to be conduct on one set in the presence of our authorized person who shall be deputed to carryout acceptance tests before delivery of the materials.

1.6.2 Routine Tests: - The following routine tests shall have to be conducted on each sets and results are to be furnished for consideration of deputing inspecting officer for inspection and conducting testing of the materials.

1. Power frequency voltage dry test

2. Measurement of resistance of main circuit

3. Tests to prove satisfactory operation.

4. Dimension check

5. Galvanization test.

1.7 GUARANTEED TECHNICAL PARTICULARS:-

The Bidder shall furnish the guaranteed technical particulars duly filled in the format at

Appendix-I along with the tender.

1.8 COMPLETENESS OF EQUIPMENT:-

Any fittings, accessories for apparatus which may not have been specifically mentioned in this specification but which are usual or necessary in equipment of similar plant shall be deemed to be included in the specification and shall be supplied by the Tender without extra charge. All plant and equipment shall be completed in all details whether such details are mentioned in the specification or not.

1.9 INSPECTION:-Routine and acceptance tests shall be conducted at the place of manufacturer. The bidder are requested to furnish details of equipment which will be used for testing along with tender. The bidder of those manufacturers who do not have adequate testing facilities for conducting routine and acceptance test are liable for cancellation. The successful bidder has to furnish routine test certificate and guaranteed certificate for approval prior to offer of materials for inspection for each consignment of offer.

(To be submitted with offer)

GUARANTEED TECHNICAL PARTICULARS FOR 33KV, 400A, 50 HZ,

3 POLE, SINGLE BREAK TYPE

Sl.

No

Particulars

Desired values

Bidder‘s

offer

1 2 3 4

1.

Maker‘s name and country

of origin

To be specified by the tenderer

2. Type of Switch Rotating type only

3. Suitable for mounting Horizontal only

4.

Number of supporting post

insulators per phase

4 nos.22 KV / 24 KV Post Insulators per phase

as per ISS-2544/1973.

5.

Post Insulator.

a)

Maker‘s name and country

of origin


b)

Type of cementing

To be quoted for original cemented only &

as per IS-2544-1973 & relevant IEC.

c)

One minute power frequency

withstand voltage Dry

95 KV RMS.

d)


withstand voltage Wet

75 KV RMS.

e) Visible discharge voltage 27 KV RMS.

f)

Dry Flashover Voltage


g)

Power frequency puncture

with stand voltage

1.3 times of actual dry flash over voltage

h)

Impulse withstand voltage

(switch in position)

170 KV (peak)

i)

Creepage distance (mm)

380 mm minimum. (actual creepage distance for which type test have been conducted is to be specified by the tenderer

6.

Impulse withstand voltage

for positive and negative

polarity 1.2 / 50 mircro-

second wave

a)

Across the isolating distance

195 KV (peak)

b)

To earth & between poles

170 KV (peak)

7.


withstand voltage

a)

Across the isolating distance

80 KV (RMS)

b)

To earth & between poles

70 KV (RMS)

8.

Rated normal current and

rated frequency

400 amps. 50 Hz

9.

Rated short time current.

16 KA ( RMS )

10.

Rated short circuit making

capacity

25 KA (RMS)

11.

Rated peak withstand current

40 KA ( Peak )

12.

Rated cable charging

breaking capacity

40 KA ( RMS )

13.

Rated Transformer off load

breaking capacity

16 Amp (RMS)

14.

Rated line charging breaking

capacity

5.3 Amps ( RMS)

15.

Minimum clearance between

adjacent phases

a)

Switch Closed ( centre to

centre)

1200 mm

b)

Switch Opened ( centre to

edge of blade)

640 mm

16.

Temperature rise

a)

Temperature rise shall not

exceed the maximum limit as specified below at an

ambient temperature not exceeding in 40

0 C

b)

Copper contacts in air 65

0 C

c)

Terminal of switch intended to

be connected to external

conductor by bolts

50 0

C

17.

Vertical Clearance from top of

insulator cap to mounting

channel

508 mm (minimum)

18.

Type of Contact: -

a) Self aligned, high pressure jaw type fixed

contacts of electrolytic copper of size 80

mm x 50 mm x 8 mm duly silver plated. Each

contact should be revetted with three nos.

Copper rivets with a bunch (minimum

3 mm thick) consisting of copper foils, each

may vary from 0.15 mm to 0.25 mm. These

total thickness of copper foils per jaw

should be 6 mm. Jaw assemblies are to be

bolted through stainless steel bolts and nuts

with stainless steel flat and spring washer.

b) Solid rectangular blade type moving

contact of electrolytic copper size 250 mm x

50 mm x 8 mm duly silver plated ensuring a

minimum deposit of 10 micron of silver on

copper contacts or as may be prescribed

under relevant ISS / IEC.

c) Pressure spring to be used in jaw contacts

shall be Stainless Steel having 8 nos of turn x

28 mm height x 14.4 mm diameter with

14 SWG wire (minimum six nos springs shall

be used)

19.

Connectors:-

Terminal connectors for both movable and

fixed should be of copper flats of same size

similar to that of moving contact blades

(minimum 95% copper composition). The

fixed connector shall of size 80 mm x 50 x 8 mm

and the size of movable connector shall be size

80 x 50 x 8 mm with machine finishing

duly silver plated with 2 nos. of

3/8‖ stainless steel bolts, nuts, plain washers

& spring washers should be provided along

with 2 nos solder less bimetallic sockets for

each connector suitable sockets for each

connector suitable up to

232 mm² AAA conductor.

20.

Moving Contacts:-

Movable contact is to be supported by

galvanized angle of 50 x 50 x 5 mm in each

phase and the moving contact are to be

bolted through 2 no stainless steel bolts and

nuts with suitable stainless steel flat and

spring washers.

21.

Galvanization

a) Iron parts shall be dip galvanized as per

IS-2633/1972.

b) b) The pipe shall be galvanized as per IS-

4736/1968.

22.

Details of Phase

a)

Coupling Rod

25 mm nominal bore G.I. pipe medium

gauge.

b)

Operating Rod

32 mm nominal bore G.I. pipe medium

gauge single length 6 mtrs. The detailed

dimension of the G. I. pipe as per IS-1239 (Pt.

I) as mentioned below :-

Nominal

base (mm)

Outside

diameter

(mm)

Diameter

thickness (mm)

Max Min

25 34.2 33.3 3.25

32 42.9 42 3.25

c)

Arcing Horns

10 mm dia G.I. rod with spring assisted

operation.

d)

Force of Fixed contact spring

To be specified by the tenderer.

e)

Copper braided flexible

tapes:-

450 mm length of flexible electrolytic

copper tape or braided chord (with tin

coated) having minimum weight 450 gms per

meter and both ends shall be crimped with

copper sockets through brass bolts and nuts

with brass flat washers. Two nos of suitable

copper sockets shall be used at both ends. The

minimum no. of flexible wires should be 1536

of 36 SWG for each flexible chord.

f)

Quick break device

Lever mechanism.

g)

Bearings

4 nos. self lubricated bearing to be provided

with grease nipple including 4th bearing

being a thrust bearing.

h)

Locking arrangement

Pad Lock & Key arrangement at both ‗ON‘

& ‗OFF‘ position.

i)

Earth Terminal:

To be provided at base channels.

23.

Supporting Channels

100 mm x 50 mm M.S. Channel hot dip

galvanized.

24.

Weight of each pole

complete

To be specified by the tender

GUARANTED TECHNICAL PERTICULARS OF 11KV 400AMP 3 POLE AB SWITCH

Slno. Perticulars Requirement Bidder’s Offer

List of relevant standards :IS

1818,9921,2544,1394,4691,325,

4722, 2629, 4759, 2633,1573,3033,

2016, 3961, 5561, 1554, 5578,

11353,9920

1 Maker’s name & Address

To be specified by the bidder

2 Type of Switch Rotating Type

3 Suitable for mounting Horizontal only

4 No. of Breakers per phase

Single Break

5 No. of Post Insulators per phase 2nos. of 12KV Post Insulators as per

IS:2544/73 per phase

6

(a)

Post Insulators

Maker’s Name & Country of

Manufacture

of Post Insulator

Techno Ceramic / Allied Ceramic

/JSI/equivalent Type Test certificates to

be provided along with the offer.

(b) Type of cementing Original Cementing. The insulator to be

cemented with MCI (Hot dip galvanised

/Al Alloy cap and MCI/Forged steel hot

deep galvanized pedestral)

(c) Power frequency withstand

voltage (Dry)

65KV RMS

(d) One minute Power frequency

withstand

voltage (wet)

40KV RMS

(e) Visible discharge voltage

9KV RMS



withstand

voltage

110KV

(h) Creapage distance 320 mm

(7) Impulse withstand voltage for positive

& negative polarity (1.2/50

micro second wave)

(a) Across the isolating distance

85KV Peak

(b) To earth & between poles

75KV Peak

8 Rated one minute

Power frequency withstand

voltage

(a) Across the Isolating distance

32KV(RMS)

(b) To earth & between poles

28KV(RMS)

9(a) Rated voltage

nominal/maximum

11/12KV

(b) Rated normal current and rated

frequency

400 Amps. 50hz

10 Rated short-circuit making

capacity

20KA (Peak)

11 Rated Short-time current

16KA

12 Rated peak withstand current

40KA

13 Rated mainly active load

breaking capacity

10KA

14 Rated transformer off load breaking

capacity

16.3A

15 Rated line charging capacity

2.5A(RMS)

16 Rated cable charging capacity

10A(RMS)

17 Minimum clearance between

adjacent

phase

(a) Switch closed (center to center)

Mm

(b) Switch opened (Center of post

insulator to the

edge of the blade)

Mm

18 Temperature rise The

Temperature rise should not exceed

the

maximum limit to 65oC

at an ambient temperature not

exceeding 40oC

The Temperature rise of contacts &

terminals are within permissible limit of

650C & 50oC respectively.

19 Vertical clearance from Mm

top of insulator cap to mounting

channel

20 Type of connect a) Self aligned high pressure law

type fixed contacts of hard drawn

copper of size 50X8X70 mm

contact is riveted with three nos.

copper rivets with a bunch of

copper strips suitable to give

desired spring action.

b) Solid rectangular blade type

moving contact of size 50X8 mm

and length 220 mm duly silver

plated.

c) Stainless Steel 4 NOS of

Pressure springs are to be used in

each jaw contacts having 8nos. of

turns X28mm heights

X14.4mm diameter with 14 SWG

wire

21(a) Terminal connector

(fixed)

Copper flat of size 50X8 mm and length

95mm duly silver plated with 1

no. long 1/2” dia G.I. Nut Bolt &

Spring washers suitable for 10Sq.mm

conductor.

(b) Terminal connector

(Movable)

Copper flat of size 50X8mm and length

100mm duly silver plated with

1no long ½” dia G.I. Nut Bolt & Spring

washers suitable to accommodate

bimetallic socket up to 100 sq mm.

conductor.

22 Terminal supporting flat Movable terminal contact is

supported by G.I. flat of size 50 X

8mm X 370mm on each phase.

23

(a)

Phase Coupling Rod ISI mark 25mm nominal bore G.I.

Pipe (Medium) conforming to

IS:1239/Part

(b) Operating Rod ISI mark 32mm nominal bore G.I.

Pipe (Medium) conforming to

IS:1239/Part

(c) Arcing Horn 10mm dia G.I. Rod

(d) Force of fixed contact spring

30 lbs to 50 lbs

(e) Copper braided flexible taps 320mm long 2no. tin coated copper

braided flexible tape both end seated

with cupper sheets duly punched for

fixing

(f) Quick break device Lever mechanism

26 Fastners All fastners (nut & bolds) should be

hot-dip galvanished & should be

provided with spring and plane

washers.

27 Material & Dimension of

Coupling Pipe

28 Material & Dimension of

Operating Rod

29 Sockets (Lugs) Shall be tinned cupper sholder less

crimping type confirming to IS : 8309

& 8394 suitable for aluminium

conductor. The cable lugs shall suit

the type of terminals provided. The

cable lug shall be of Dowel make.

30 Detailed drawing submitted ?

Yes

TECHNICAL SPECIFICATION FOR 33KV, 400 AMP , 3 POLE HG FUSES

SCOPE:This specification covers the design manufacture, shop testing, loading, transportation and

delivery at sub-station site of 33KV, 400Amp, 3Pole & 11KV, 400Amp, 3Pole H.G. Fuse Sets for outdoor

installations to be used at 33/11KV Sub-stations suitable for operation under off load conditions.

The 33KV. 400Amps, 3 Pole H.G Fuse Sets shall confirm to the following parameters:-

i) Number of Poles:- 3

ii) No. of insulator per pole:- 4nos. 22/24KV Post Insulator/ Phase

iii) Nominal system voltage 33 KV

iv) Highest system voltage:- 36KV

v) Rated frequency:- 50 Hz

vi) System earthing:- Effectively earthed

vii) Rated normal current 400 Amps

viii) Altitude of installation Not exceeding 1000 M.

The post insulator used in the H.G. Fuse set shall have the following ratings:-

i) Power frequency withstand voltage (dry) 95KV (RMS)

ii) Power frequency withstand voltage ( wet) 75 KV (RMS)

iii) Impulse withstand voltage (dry) 170 KV (Peak)

iv) Power frequency puncture withstand voltage 1.3 times the actual dry flashover voltage of the unit.

STANDARDS:- The H.G. Fuse Set shall conform to the following standards:-

i) IS- 5792- 1973 (For high voltage expulsion fuses & similar fuses)

ii) IS-2544-1973 ( for porcelain post insulators)

iii) IS-9385-1979 or its latest amendments if any.

iv) IS-2633-1979 ( For Galvanization of ferrous parts )

INSULATORS:The 22KV/ 24KV post insulators complete with pedestal cap duly cemented to be used in the H.G. Fuse sets confirming to IS-2544/1973.

The bidder shall mention make, type of insulation materials, metal fittings, Creepage distance, protected Creepage distance, tensile strength compression strength, torsion strength and cantilever strength.

The bidder shall furnish the type test certificate of the post insulators from their manufacturer for reference & scrutiny.

TECHNICAL DETAILS:The H.G. Fuses shall have adjustable arcing horns made of solid copper rod having

8.23 mm dia. The horns shall be fitted with screwing devices with flynuts for fixing and tightening

the fuse wire. It shall have robust terminal connector 5s of size 80mm x50 mm x 8 mm made of

copper casting ( 95% minimum copper composition) duly silver plated with two numbers of 12mm dia

brass bolts and double nuts with flat brass washers. The connector should be capable of connecting

crimp able conductor up to 232 Sq.mm. size (ACSR/ AAAC) with bimetallic solder less sockets .The H.G.

Fuse Set shall suitable for horizontal mounting on sub-station structures. The minimum clearance

between the adjacent phases of the fuse set shall be 1200 mm and the centre to centre (distance

between two post insulators of the same phase) shall be 760 mm. All metal (ferrous) parts shall be

galvanized and polished. Only post insulator (original cemented and not pin insulators shall be used

for the H.G. Fuse Set.

DRAWIING & LITERATURES:Three copies of drawings of 33KV, 400Amp, 3 Pole H.G. Fuse shall be

furnished along with the tender for reference. The details of construction and materials of different parts

of the H.G Fuse shall clearly be indicated in the tender and illustrative pamplet/ literature for the same

shall be submitted along with the tender.

TESTS & TEST CERTIFICATE: Type Test:-Certificates for the following type tests conducted within

five years proceeding to the date of opening of tender on a prototype set of H.G. Fuse in a

Govt. Approved Testing Laboratory preferably at CPRI Bangalore shall be submitted along

with the tender.

i) Impulse voltage dry test

ii) Power frequency voltage dry test

iii) Power frequency voltage wet test

iv) Temperate of resistance.

v) Test to prove the capability of carrying the rated peak short circuit current and the rated short time current.

vi) Mainly active load braking capacity test.

vii) Transformer off-load breaking test.

viii) Line charging breaking capacity test.

ix) Operation tests.

x) Mechanical endurance test.

xi) Mechanical strength test for the post insulator as per IS:2544/1973, 5350 (Pt- II)/1970 & relevant IEC.

xii) Test for galvanization of metal (ferrous) parts as per IS- 2633/1973.

Besides above, mechanical endurance test will have to be conducted on one set in the presence of our authorized person who shall be deputed to carryout acceptance test before delivery of the materials.

Routine Tests:-

The following routine tests shall have to be conducted on each sets and results are to be furnished for consideration for acceptance of deputing inspecting Officer for inspection & conducting testing of the materials

.i) Power frequency voltage dry test.

ii) Tests to prove satisfactory operation.

iii) Dimension check.

iv)Galvanisation test.

GUARANTEED TECHNICAL PARTICULARS: The bidders are required to furnish the guaranteed technical particulars at Schedules attached to this specification duly filled in along with the tender.

COMPLETENESS OF EQUIPMENT:-

Any fittings accessories or apparatus which may not have been specifically mentioned in this specification but which are usually necessary in equipment of similar plant shall be deemed to be included in the specification and shall be supplied by the bidder without extra charge. All plant and equipment shall be complete in all details whether such details are mentioned in the specification or not.

INSPECTION AND TESTING:-

The Purchaser shall have free entry at all times, while work on the contract is being performed, to all parts of the manufacturer‘s works which concern the processing of the equipment ordered. The manufacturer shall afford the Purchaser without charge, all reasonable facilities to assure that the equipment being furnished is in accordance with this specification.

The equipment shall successfully pass all the type tests and routine tests referred to and those listed in the most recent edition of the standards given in this specification.

The Purchaser reserves the right to reject an item of equipment if the test results do not comply with the values specified or with the data given in the technical data schedule.

Type tests shall have been / shall be carried out at CPRI / National Govt. approved Laboratory and be witnessed by a representative of such laboratory or some other representative acceptable to the Purchaser. Routine tests shall be carried out by the

Supplier at no extra charge at their works.

Adequate facility with calibrated testing equipment must be provided by the manufacturer free of cost to carry out the tests. Type test certificates must be furnished along with the tender for reference of the Purchaser.

All costs in connection with the testing, including any necessary re-testing, shall be borne by the Supplier who shall provide the Purchaser with all the test facilities which the latter may require, free of charge. The Purchaser shall have the right to select the samples for test and shall also have the right to assure that the testing apparatus is duly calibrated and correct. Measuring apparatus for routine tests shall be calibrated at the expense of the Supplier at an approved laboratory and shall be approved by the Purchaser.

The Supplier shall be responsible for the proper testing of the plant or materials supplied by sub-suppliers to the same extent as if the work, plant or materials were completed or supplied by the Supplier.

Any cost, incurred by the Purchaser in connection with inspection and re-testing as a result of failure of the equipment under test or damage during transport or offloading shall be to the account of the Supplier.

The supplier shall submit to the Purchaser five signed copies of the test certificates, giving the results of the tests as required. No materials shall be dispatched until the test certificates have been received by the Purchaser and the Supplier has been informed that they are acceptable.

The test certificates must show the actual values obtained from the tests, in the units used in this specification, and not merely confirm that the requirements have been met.

In the case of components for which specific type tests or routine tests are not given in this specification, The Supplier shall include a list of the tests normally required for these

components. All materials used in the Contract shall withstand and shall be certified to have satisfactorily passed such tests.

The Purchaser at his discretion may re-confirm the Test Results in his own laboratory or laboratory of his choice.

No inspection or lack of inspection or passing by the Purchaser‘s Representative of equipment or materials whether supplied by the Supplier or sub-supplier, shall relieve the Supplier from his liability to complete the contract works in accordance with the contract or exonerate him from any of his guarantees.

GURANTEED TECHNICAL PARTICULARS FOR 400 AMP, 3 POLE, H.G. FUSES.

Sl.

No.

Particulars

Desired Values for

Bidder‘s

Offer

33 KV

1 2 3 4

1

Maker's name and

country or origin

To be specified by the bidder.

2

Suitable for mounting

Horizontal only.

3

Number of supporting

post

insulator per phase

4 nos. 22KV/24KV Post Insulator per phase as per ISS -

2544/ 1973

4 Post Insulator

(a)

Maker's name and

country or origin


(b)

Type of cementing

To be quoted original cemented only.

(c )

One minute power

frequency withstand

voltage dry

95KV RMS

(d)

One minute power

frequency withstand

voltage wet.

75 KV RMS.

(e)

Visible discharge

voltage

27KV RMS

(f)

Dry Flashover

Voltage


(g)

Power frequency

puncture withstand

voltage

1.3 times of actual dry flash over voltage.

(h)

Impulse withstand

voltage (switch in

position)

170KV (peak)

(I )

Creepage distance

380mm minimum. (actual creepage distance for

which type test have been conducted is to

be specified by the bidder)

5

Impulse withstand

voltage for positive

and negative

polarity (1.2/50

micro second wave)

(a)

Across the isolating

distance

195 KV (peak)

(b)

To earth & between

poles

170 KV (peak)

6

One minute power

frequency withstand

voltage

(a)

Across the isolating

distance

100 KV (RMS)

(b)

To earth & between

poles

75 KV (RMS)

7

Rated normal current and rated frequency.

400 amps, 50 Hz , 3 Pole

8

Operating Voltage

33 KV

9

Vertical clearance

from top of insulator

cap to mounting

Channel

508 mm (minimum)

10

Height of the riser

for carrying the

horns.

250mm from the cap

(top) of insulator.

11

Details of Arcing

Horns

Copper rod having 8.32 mm dia Silver-plated provided

with screwing arrangement for fixing use wire made of

copper casting. (Total length 995mm). All the bolts, nuts

and washers should be made out of brass.

12

Riser Unit

(250mm total height).

(a) The shape of connectors may be made of

straight copper Flat of size adequate enough to carry a

current density not ess than 1.5 Amp/ mm .

2 Nos of 3/8‖ G.I. Bolts, double nuts, plain and spring

washers and 2 nos. solder less bimetallic shockets per each

connector suitable up to 232mm² AAA conductor.

(b) 170mm height G.I. Risermade of 25mm nominal

bore medium gauge G.I. Pipe welded with 2 nos. G.I.

Flat of 35 x 5 mm at both ends fixed with 10mm dia

stainless steel, bolts and nuts with flat stainless steel

spring washers.

13

Supporting

Channels

100 x 50 x 6 mm M.S. Channel (galvanized)

14

Galvanisation

All ferrous parts should be galvanized as per IS-

2633/1972 & all non-ferrous part should be duly

galvanized..

15

Weight of each pole

(complete)

To be specified by the tenderer.

33KV 3-Pole 200 Amp H.G Fuse

Technical Specification

1. SCOPE: - This specification covers the manufacture, testing and supply

of 33 KV 200 Amps 3 pole, H.G. Fuse Sets.

2. (a) The 33 KV H.G. Fuses shall be suitable for out door operation in horizontal

configuration under the climatic conditions specified. It shall be of the following

ratings:-

1 Number of Poles 3 2 No.of Insulator per Pole 4 nos. 22 KV /24 KVpost Insulators per phase

3 Nominal system Voltage 33 KV 4 Highest System of Voltage 36 KV 5 Rated frequency 50 Hz 6 System Frequency Effectively earthed 7 Rated normal current 200 Amps 8 Altitudes of installation Not exceeding 1000 M.

(b) The post insulator used in the H.G. Fuse set shall have the following ratings :-

1 Power frequency withstand voltage (dry) 95 KV (RMS) 2 Power frequency withstand voltage (wet) 75 KV (RMS) 3 Impulse withstand voltage (dry) 170 KV (Peak) 4 Power frequency withstand voltage 1.3 times the actual dry flashover

voltage of the unit

3. STANDARDS :- The H.G. Fuse set shall confirm to the following standards. IS- 9385-1980 ( for high voltage expulsion fuses and similar fuses).

IS- 2544-1973 ( for porecelain post insulators or its latest amendments if any.). IS- 2633- 1979 ( for Galvanisation of ferrous parts).

4. INSULATOR MAKE :- 22/24 KV post insulator complete with pedestal cap duly

cemented to be used in 33 KV H.G. Fuse sets confirming to IS-2544/1973.

5. TECHNICAL DETAILS :- The H.G. Fuses shall have adjustable arcing horns made

of solid copper rod having 8.23 mm dia. The horns shall be fitted with screwing

devices with fly nuts for fixing and tightening the fuse wire. It shall have robust terminal

connector of size 80 mm x 50 mm x 8 mm made of copper casting ( 95 % minimum

copper composition) duly silver plated with two numbers of 12 mm dia brass bolts

and double nuts with flat brass washers. The connectors should be capable of

connecting crimpable conductor upto 80 Sq. mm size( ACSR/ Alloy) with bimetallic

solderless sockets. The H.G Fuse Set shall suitable for horizontal mounting on sub

station structures. The minimum clearance between the adjacent phases of the fuse set

shall be 1200 mm and the centre to centre (distance between two post insulators of the

same phase) shall be 760 mm. All metal (ferrous) parts shall be galvanized and polished.

Only post insulator ( orginal cemented and not pin insulators shall be used for the H.G.

Fuse Set.

6. CLIMATIC CONDITIONS :- The H.G. fuse set shall be suitable for operation

under the following climatic conditions.:-

1 Maximum ambient air temperature 450

C

2 Maximum daily average air temperature 350

C

3

Maximum yearly average ambient air temperature 300

C

4 Maximum temperature attainable by a body

exposed to the sun. 50

0 C

5 Minimum ambient air temperature 00

C

6 Maximum relative humidity 100% 7 Average number of thunderstorm days per annum 70 days 8 Average number of rainy days per annum 120 9 Average annual rain fall. 50 cm 10 Number of months of tropical monsoon conditions 4 11 Maximum wind pressure 260 Kg/mm 12 Degree of exposure to atmospheric pollution. Normally polluted

atmosphere.

7 Type Test :-

Certificate for the following type tests conducted (within five years proceeding to the date of opening of the tender) on a prototype set of H.G. Switch in a NABL approved test house/CPRI shall have to be submitted along with offer.

i) Dielectric test (impulse & one minute wet power frequency withstand voltage test.)

ii) Temperature rise test ( for terminals)

iii) Mechanical strength test for the post of insulator as per IS-2544/1973

iv) Test for galvanization of metal (ferrous) parts.

8. ROUTINE/ACEPTANCE TESTS :-

The inspection may be carried out by the Purchaser at any stage of manufacture. The

successful bidder shall grant free access to the Purchaser‟s representative at a

reasonable time when the work is in progress. The following routine tests shall have to

be conducted on each set and results are to be furnished for consideration of

deputing inspecting officer for inspection and conduction testing of the materials at the

works of the manufacturer. the supplier shall give fifteen days advance intimation to

the Purchaser to enable him to depute his representative for witnessing the tests.

i) Power frequency voltage dry test

ii) Dimension Check

iii) Galvanization test.

9. Guaranteed Technical Particulars :

The bidders are required to furnish the guaranteed technical particulars duly filed in the

proforma along with the bid.

10. Completeness of Equipment :

Any fittings accessories or apparatus which may not have been specifically mentioned in

this specification but which are usually necessary in equipment of similar plant shall be

deemed to be included in the specification and shall be supplied by the bidder without extra

charge. All plant and equipment shall be complete in all details whether such details are

mentioned in the specification or not.

11. Inspection :

Routine and acceptance test shall be conducted at the place of manufacturer. The bidders are

requested to furnish details of equipments which will be used for testing along with the bid.

The bids of these manufacturers who do not have adequate testing facilities for conducting

routine and acceptance test are liable for cancellation. The successful bidder has to furnish

routine test certificate and guarantee certificate for each consignment of materials to be

inspected at the time of offer of materials for inspection.

Sl.

No

Particulars

Requirement

Bidders offer

33 KV ,200 Amps.3 pole H.G Fuse


2 Operating voltage 33 KV

3 No. of Post Insulators per

phase

4nos. of 22KV/24 KV Post Insulators per phase

4 Rated normal current & normal frequency

200 Amp., 50 Hz

5 Vertical clearance from the top of insulator to mounting

channel

508 mm (minimum)

6 Height of the riser for carrying

the horn.

250 mm from the cap top of

insulator

7 (a)

Post Insulators :

Maker‟s Name & Country of Manufacture of Post Insulator

Reputed make . All the post insulators provided shall be of

same make.

(b) Type of cementing Original Cementing only.

(c) 1 minute Power frequency

withstand voltage (Dry)

95KV RMS

(d) 1 minute Power frequency

withstand voltage (wet)

75KV RMS




withstand voltage

1.3 times of actual dry flash over

voltage.

(h) Creapage distance 430 mm(minimum). Actual creepage distance for which type

test has been conducted is to be

supplied.

8. Impulse withstand voltage for positive & negative polarity


(a) Across the isolating distance 195KV (Peak)

(b) To earth & between poles 170KV (Peak)

9. One minute Power frequency withstand voltage

(a) Across the Isolating distance 100KV(RMS)

GUARANTEED TECHNICAL PARTICULARS of 33 KV 200 Amp

3 Pole HG Fuse


10 1.2/50 microsecond wave

impulse flash over voltage


11 Details of Arcing Horn 1‟ SWG (8.23 mm) copper rod silver plated provided with screwing

arrangement on the fuse carrier made

of copper casting for fixing fuse wire

(Total length -995 mm). All the

bolts, Nuts and washers should be

made out of Brass.

12 Riser Unit (250 mm height total)

a) Riser cum Connector made out of copper casting (with minimum 95%

copper composition having riser size

(80 mmx50mmx8 mm) and

connector of size (80 mmx50mmx8

mm) duly silver plated and machine

finishing provided with 2 nios.12

mm dia. brass bolts and double brass

nuts with flat brass washers and 2

nos. solderless bimetallic socket per

each connector suitable upto 80 mm²

conductor. The sockets shall be

preferably of “Usha Martin” make.

b) 170 mm height G.I Riser made of 25 mm nominal bore medium gauge

G.I pipe welded with 2 nos. of G.I flat

of 35mmx5mm of both ends fixed

with 10mm dia. stainless steel bolts

and nuts with flat & stainless steel

spring washer.

13. Galvanization a) All ferrous parts shall be hot- dipped Galvanized as per

IS.2629/1985 (Latest Amendment)

b)The pipe shall be galvanized as per IS-4736/1968(Latest Amendment)

14 Supporting Channel 100mmx50mm M.S.Channel. (Hot

dip galvanized)

15 Weight of each pole 50 Kg (Approximately)


N.B i) Ferrous parts shall be duely galvanized as per IS :2629/1985(1st. Revision),


ii) Certificate from a Government approved laboratory regarding composition of copper in

electrolytic copper casting of materials should be submitted during inspection of materials

at the cost of tenderer.

iii) Items not covered in the G.T.P, but relevant in Design, manufacturing, quality control & testing of materials shall be governed by the relevant IS with latest Amendment.

11KV 2/3 Pole D.O. Fuse 200Amp

01) SCOPE:

This specification covers outdoor, open, drop out expulsion type fuse cut outs suitable for installation in

50Hz, 11KV distribution system for protection of H. T. lines and transformer centers, Tap lines. The 11KV D.O.

fuses offered shall be complete with all components necessary for it‟s effective and trouble free operation.

02) APPLICATION:

The distributions fuse Drop outs are intended for use on distribution transformers and have no inherent load break

capacity.

03) APPLICABLE STANDARD:

Unless otherwise modified in this specification, the Drop out fuse shall conform to IS: 9385 (Part-I to III) as

amended from time to time.

04) RATED VOLTAGE:

The rated voltage shall be 12 KV.

05) RATED CURRENT:

The rated current shall be 200 A.

06) RATED LIGHTING IMPULSE WITH STAND VOLTAGE VALUES FOR THE FUSE BASE:

The rated lightning impulse withstands voltage both for positive and negative polarities shall be as given below.

a) To earth and between pole: 75 KV (Peak)

b) Across the isolating distance: 85KV (Peak) of fuse base.

07) RATD ONE MINUTE POWER FREQUENCY WITHSTAND VOLTAGE (DRY AND WET)

VALUES FOR THE FUSE BASE:

a) To earth and between poles: 28KV (rms)

b) Across the isolating distance: 35KV (rms)

08) TEMPERATURE RISE LIMIT (IN AIR) :

a) Copper contacts silver faced: 65ºC

b) Terminals: 50ºC

c) Metal parts acting: The temperature shall not reach as springs such a value that elasticity of the Metal is

changed.

09) BREAKING CAPACITY:

The breaking capacity of D.O. Fuse element shall be 8 KA (asymmetrical).

10) GENERAL REQUIREMENTS/CONSTRUCTIONAL DETAILS:

10.1 The D.O. Fuse shall be of single vent type (downward) having a front connected fuse carrier suitable

for angle mounting.

10.2 All ferrous parts shall be hot dip galvanized in accordance with the latest version of IS: 2633.

Nuts and bolts shall conform to IS:1364. Spring washers shall be electro-galvanized.

11) FUSE BASE TOP ASSEMBLY:

11.1 The top current carrying parts shall be made of a highly conductive copper alloy and the contact

portion shall be silver plated for corrosion resistance and efficient current flow. The contact shall

have a socket cavity for latching and holding firmly the fuse carrier until the fault interruption is

completed within the fuse.

11.2 The top contact shall be actuated by a strong steel spring which keeps it under sufficient pressure

to maintain a firm contact with the fuse carrier during all operating conditions. The spring

shall also provide flexibility and absorbs most of the stresses when the fuse carrier is pushed

into the closing position.

11.3 The current carrying parts of the assembly shall be protected from water and dust formation by

a stainless steel top cover.

11.4 The top contact assembly shall have a robust galvanized steel hook to align and guide the fuse

carrier in to the socket latch even when the fuse carrier is closed at an off centre angle.

11.5 The top assembly shall have an aluminum alloy terminal connector

(refer clause 19).

11.6 The top assembly shall be robust enough to absorb bulk of the forces during the fuse carrier

closing and opening operations and shall not over stress the spring contact. It shall also

prohibit accidental opening of the fuse carrier due to vibrations or impact.

12) FUSE BASE BOTTOM ASSEMBLY:

12.1 The conducting parts shall be made of high strength highly conductive copper alloy and the contact

portion shall be silver plated for corrosion resistance and shall provide a low resistance current

path from the bottom fuse carrier contacts to the bottom terminal connector.

12.2 The bottom assembly shall have hinge contacts made from highly conductive, anti-corrosive copper

alloy and shall accommodate and make a firm contact with the fuse carrier bottom assembly. The

fuse carrier shall be placed easily in or lifted from the hinges without any man handling. In

addition, the bottom assembly shall perform the following functions.

i) When opened manually or after fault interruption the fuse carrier shall swing through 180º to the vertical

and its further travel shall be prevented by the fuse base bottom assembly

ii) The fuse carrier shall be prevented from slipping out of the self locking hinges during all operating

conditions and only when the fuse carrier has reached its fully open position then only if can be

removed from the hinge support.

12.3 The assembly shall have an aluminum alloy terminal connector (refer clause 19).

13) FUSE CARRIER TOP ASSEMBLY:

13.1 The fuse carrier top contact shall have a solid replaceable cap made from highly conductive, anti-

corrosive copper ally and the contact portion shall be silver plated to provide a low resistance

current path from the fuse base top contact to the fuse link. It shall make a firm contact with

the button head of the fuse link and shall provide a protective enclosure to the fuse link to

check spreading of arc during fault interruptions.

13.2 The fuse carrier shall be provided with a cast bronze opening eye (pull ring) suitable for operation

with a hook stick from the ground level to pull-out or close-in the fuse carrier by manual

operation.

14) FUSE CARRIER BOTTOM ASSEMBLY:

14.1 The fuse carrier bottom assembly shall be made of bronze castings with silver plating at the

contact points to efficiently transfer current to fuse base. It shall make smooth contact with

the fuse base bottom assembly during closing operation.

14.2 The bottom assembly shall have a lifting eye for the hook stick for removing or replacing the fuse

carrier.

14.3 The bottom assembly shall have a suitable ejector which shall perform the following functions. i) It shall keep the fuse link in the centre of fuse tube and keep it tensioned under all operating

conditions.

ii) It shall be capable of absorbing the shock when the fuse carrier is pushed Into the closed

position and shall not allow the fuse link to be damaged. This is specially important when the

fuse link is of low ampere rating.

iii) The ejector at the instant of interruption shall retain the fuse carrier in the closed

position ling enough to ensure that the arc is extinguished within the fuse tube thereby

excluding the possibility of arcing and subsequent damage at the contact surfaces.

iv) The ejector shall help the fuse link separation after fault interruption, allowing the

fuse carrier to drop out and clearing the pigtail of the blown fuse link through the bore of use

tube.

15) FUSE BASE (PORCELAIN):

The fuse base shall be bird-proof, two units porcelain insulator with a creep age distance (to earth) not

less than 320mm. The insulators will be supplied with 10KN as per IS:731

16) FUSE TUBE:

The fuse tube shall be made of fiber glass coated with ultraviolet inhibitor on the outer surface and

having arc quenching bone fiber liner inside. The tube shall have high bursting strength to sustain high

pressure of the gases during fault interruption. The inside diameter of the fuse tube shall be 17.5mm. The

solid cap of the fuse carrier shall clamp the button head of the fuse link, closing the top end of the fuse

tube and allowing only the downward venting during fault interruption.

17) TYPE TESTS :

The Drop out shall be subjected to the following type tests.

i) Dielectric tests (rated impulse withstand and rated one minute power frequency withstand

test voltages

ii) Temperature rise test. The above tests shall be carried out in accordance with IS: 9385 Parts I and II.

FOR PORCELAIN FUSE BASE ONLY:

iii) Pull out test for embedded components of the fuse base.

iv) Beam strength of porcelain base.

18) MOUNTING ARRANGEMENT:

The Drop outs mounting arrangement shall be made of high strength galvanized steel flat and shall

be robust enough to sustain the various stresses encountered during all operating conditions of the

Drop out.

19) TERMINAL CONNECTIONS:

The Drop out shall be provided with two aluminum alloy as per IS: 617-1994) terminal connectors at top

and bottom of fuse base assemblies to receive aluminum conductors of diameters between 6.3mm to

10.05mm. These terminals shall be easily accessible irrespective of the Drop out location with respect of

the pole. The terminals shall meet the test requirements of REC construction standard E-30.

20) NAME PLATE:

Aluminum anodized name plate shall be fixed at base of D.O. fuse. The following information shall

be duly punched or engraved on it.

(1)Manufacturer‟s name

(2) P.O. No. and date

(3) Rated voltage

(4) Rated normal current

(5) Frequency

(6) Sr. No. of D. O. fuse

(7) Property of NESCO etc.

21) INSPECTION :

All tests and inspection shall be made at the place of manufacture unless otherwise especially agreed

upon by the manufacturer and the purchaser at the time of purchase. The manufacturer shall afford the

inspector representing the purchaser all reasonable facilities without charge, to satisfy him that the material

is being furnished in accordance with this specification.

The purchaser has the right to have the tests carried out at his own cost by an independent agency whenever

there is dispute regarding the quality of supply.

22) ROUTINE TESTS :

The following routine tests shall be carried out by the manufacturer on each unit to check the essential

requirements.

a) Visual inspection.

b) Verification of all dimensions.

c) Power frequency voltage dry test.

Supplier is required to maintain the register for routine tests and will show to the inspector, who comes

for inspection for verification / confirmation purpose.

d) Mechanical operation: 10Nos of open-close operation per unit ON operation can be carried

out with operating rod. OFF operations can be carried out by cutting the fuse wire so that it falls freely

as in actual service condition.

23) ACCEPTANCE TESTS:

The following tests shall be carried out at supplier‟s works on the samples selected from the offered lot as

per the sample procedure given at clause No.24 of this specification.

I. Visual inspection.

II. Verification of dimensions of all parts as per approved Drawing.

III. Power frequency voltage dry test as per IS: 73/71 with latest amendment if any.

IV. Mechanical operation test ON-OFF operation (100 Nos. ON-OFF operation) can be carried out with

operating rod. OFF operations can be carried out by cutting the fuse wire so that it falls freely as in

actual service condition.

V. Temperature-rise test.

VI. Galvanizing test

VII. Test on F. R. B. P. Tube.

VIII. Chemical composition test of all current carrying components.

25) TEST CERTIFICATE FOR POST INSULATOR:

For the offered lot supplier shall have to submit acceptance and routine test certificate received from the

original manufacturer for 11KV post insulator and FRBP tube used in the manufacturing of D.O. fuse.

It is preferred that insulators of same make are used in one lot. However, if insulators of different make are

used in one lot of D. O. fuse then supplier will have to submit Type test certificates (Validity up to 5

Years) received from the respective original manufacturer for the insulators used in D. O. fuse.

11 KV 200 Amp 2 / 3 Pole D.O. Fuse

Guaranteed Technical Particulars

Slno. Description & Specification Bidder’s Offer

1 Normal system voltage 11KV

2 Rated Voltage – 12KV

3 Rated Current-200Amp.

4 Rated frequency – 50 Hz.

5 Rated – 1 (one) inute power frequency withstand voltage.

a) between pole and earth – 28 V Yes

b) across the isolating distance of fuse of base – 35 KV Yes

6 Lightening Impulse Voltage With stand

a) Earth & between poles - 75 KV (Peak)

b) Across Isolating - 85KV (Peak) of fuse base.

7 Breaking Capacity – 8KA

8 Contact shall be made from phosphorus bronze (Copper Alloy)

Yes i.e. the contact should be silver plated with thickness of

coating not less than 2.5 Micron and the contact points should

efficiently transfer current to fuse base.

9 The fuse band shall be made from fiber glass tube (FRBP Tube)

made from synthetic resin bounded woven glass fabric grade MF-4

laminated sheet as per BS-3953/1976

10 11KV Solid Core Insulators having 320mm minimum creep age

distance and 10 KN (minimum) mechanical failing load shall be

provided Max Well Ceramics / Vishal Malleable or any other

approved material. The offer with any other make insulators also

are acceptable and in the event of order the same shall have to be

got approved and type tested by selecting samples by the

inspecting officer. .

11 All M. S. Bolts, Nuts, Washer above 10mm, ferrous shall be hot

dip galvanized.

TECHNICAL SPECIFICATION OF ELECTRICAL MATERIALS · 1 Set3 Pole 11kv 1954200A A B Switch (H) 2 3...

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Transcript of TECHNICAL SPECIFICATION OF ELECTRICAL MATERIALS · 1 Set3 Pole 11kv 1954200A A B Switch (H) 2 3...