RATE CONTRACT FOR REPAIR OF DAMAGED_FAILED 33_11 KV 3.15 MVA ,5.0 MVA, 8.0 MVA POWER TRANSFORMER

1.0) Opening of transformer cover, draining oil, de-tanking core coil assembly, Assessment and estimation for Repair and replacement of part,providing locking arrangement on all valves & plugs as per requirement of specification,Cleaning & washing of dust/ rust & dirt from all other parts including core tanks & cooling tubes, re-tank , variable with base date 01.01.2026

1.1) For 3.15 MVA Rating

1.2) For 5.0 MVA Rating

1.3) For 8.0 MVA Rating

2.0) SUPPLY OF FOLLOWING DAMAGED PARTS REQUIRING REPLACEMENT COMPLETE IN ALL RESPECT, variable with base date 01.01.2026

2.1) HV Leg Coil with insulation, varnish & baking of coil assembly (Vacuum impregnation)(the burn leg is to be retained by contractor)

2.2) LV Leg Coil with insulation, varnish & baking of coil assembly (Vacuum impregnation)(the burn leg is to be retained by contractor)

3) HT bushing (33 KV) as per relevant ISS.

4) LT bushing (11 KV) & Neutral bushing as per relevant ISS.

5) Bushing rod & other metal parts including nuts ( material & size of bushing/ rods/nuts as per IS Specidfication)

5.1) For HV

5.2) For LV

6.0) Set of Gaskets (rubberized cork neoprene material & size is to be needed)

6.1) For 3.15 MVA Rating

6.2) For 5.0 MVA Rating

6.3) For 8.0 MVA Rating

7.0) Breather Dehydrator (Silicagel type with fresh silicagel)

7.1) For 3.15 MVA Rating

7.2) For 5.0 MVA Rating

7.3) For 8.0 MVA Rating

8.0) Glass for oil level gauge

9) Taping switch handel only

9.1) For 3.15 MVA Rating

9.2) For 5.0 MVA Rating

9.3) For 8.0 MVA Rating

10) Off loading Taping switch without handle

10.1) For 3.15 MVA Rating

10.2) For 5.0 MVA Rating

10.3) For 8.0 MVA Rating

11) Oil drain/ filter valve of gun metal

12) LT Terminal plate with terminals if required

13) Fresh transformer oil of standard quality of ISI mark, variable with base date 01.01.2026

14) Filtration charges if Transformer oil supplied by the Nigam / Repairer of the Transformer

15) Sundry items viz cover bolts, plug cap screws, washers, insulation material etc. with minor repairs of tank and other parts if any (Denting and welding etc. if required)

15.1) For 3.15 MVA Rating

15.2) For 5.0 MVA Rating

15.3) For 8.0 MVA Rating

16) Cooling Tubes/ Fins

17) Conservative Tank with detachable end plates.

18) Dial type thermometer 100 mm size

19) Dial type thermometer 150 mm size with a set of alarm contact for 3.15 MVA and above transformer rating.

20) Double float buchholz relay

21) Rating plate made of stainless steel or brass or alumunium engraved with details as per specification including date of despatch of transformer after repair

22) Earthing Terminals

23) Air release valve

24) Arcing horns for HT bushing and LT bushing non adjustable type

25) Winding Temperature indicator with alarm

26) Plain Capaliary type oil level guage to be provided on the oil conservator with low level indicator

27) Magnetic type oil level gauge

28) Marshalling box for transformers

29) shut off valve (Gun metal ) 1 1/2"

30) Painting inside with two coat of Zinc chromate best paint and outside of transformer with two coat of grey paint and marking after derusting

30.1) For 3.15 MVA Rating

30.2) For 5.0 MVA Rating

30.3) For 8.0 MVA Rating

31) To and Fro transportation charges from any of the circle store / Sub store to the work of the firm and back

31) a)Loading & unloading charges at firm's works and Nigam's stores (Both Sides).

31.a.1) For 3.15 MVA Rating

31.a.2) For 5.0 MVA Rating

31.a.3) For 8.0 MVA Rating

31. b) Transportation charges Per Km.

31.b.1) For 3.15 MVA Rating

31.b.2) For 5.0 MVA Rating

31.b.3) For 8.0 MVA Rating

32) Charges for minor repair where replacement of coil is not involved

32.1) For 3.15 MVA Rating

32.2) For 5.0 MVA Rating

32.3) For 8.0 MVA Rating

33) Labour charges for opening the transformer tank top cover(if required to facilitate maintenance of transformer) after removing required accessories.Including all required T&P Up to 5 MVA transformer.

34) Preventing oil leakage by changing main gasket with material after removing cover.

34.1) Upto 1.6 MVA transformer

34.2) Above 1.6 MVA & upto 3.15 MVA transformer.

34.3) Above 3.15 MVA & upto 5 MVA transformer.

35) A) Change of HV/LV bushing gasket ring and rubber washers including supply of required material & draining /re-filling of oil as required.

35) B) For additional HV/LV bushing work. * This amount will not be payable incase the work of removing of Top cover gasket is also awarded in the same order.

36) Change of gaskets of valves/radiator / Buchhloze's Relay including cost of gaskets etc.

36.1) Valve's/Buchhloze's Relay

36.2) Radiator Valves.

37) Providing & Fixing (including replacement) of HV/LV bushing of reputed make & bushing rod of brass matel including cost of gasket & rubber rings .Gasket makes are TABROSS,TIGER, ZEBRA and any other reputed make.

37.A) HV Side

37.A.1) Upto 1.6 MVA transformer

37.A.2) Above 1.6 MVA & upto 3.15 MVA transformer.

37.A.3) Above 3.15 MVA & upto 5 MVA transformer.

37.B) LV Side

37.B.1) Upto 1.6 MVA transformer

37.B.2) Above 1.6 MVA & upto 3.15 MVA transformer.

37.B.3) Above 3.15 MVA & upto 5 MVA transformer.

38) Dehydration/Filteration and reconditioning of transformer oil (electricity shall be supplied by deptt.) as per norms and testing thereof in presence of sub-station Incharge.

39) Cleaning of oil scale deposits over the body and radiators of power transformer with thinner/detergent and de-rusting in perfect manner.

39.1) Upto 1.6 MVA transformer

39.2) Above 1.6 MVA & upto 3.15 MVA transformer.

39.3) Above 3.15 MVA & upto 5 MVA transformer.

40) Change of following items:

a) Oil temperature indicator

b) WindingTemperature indicator

c) Silica gel container

d) Presser relief device Make ATBUS

e) Magnetic oil level gauge.Make ATBUS

f) Gas operated Buchhloz relay( Double floating type make ATBUS)

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