Rewinding of 1000 KVA Transformer and 11 KV HT works at various sites under EE(E)KBN,MTNL,ND

Amount

Complete rewinding of 1000 KVA primary DELTA and star secondary 11 KV / 415 volts oil filled transformer HT and LT side all 3 HT cores and 3 LT cores with suitable size copper strip / wire with H class insulation ,including dismantling the burnt winding of HT and LT sides cleaning the core, varnishing the new winding, heating, drying, testing commissioning complete in all respect etc complete as required with following test a) Megger Test, b) Ratio Test, c) Resistance Test d) Vector group test e) Megnetic balance Test f) Short Circuit Test g) No load Test.

Dismantling the 1000 KVA transformer from the foundation i/e dismantling of all incoming & outgoing connection, bus trunking at LT side and HT site etc complete as reqd and keep it to out side the room. etc. complete as reqd.

Loading the transformer in tempo with the help to chain pulley /crain & heavy labour at Tel. Exchange & unloading at workshop from tempo i/c cartage from Tel. Exchange to workshop etc complete as reqd.

Loading the transformer in tempo with the help of chain pulley/crain & heavy labour at workshop & unloading at Tel. Exchange Frome tempo i/c cartage from workshop to Tel. Exchange etc complete as reqd.

Opening of top and disconnecting all the connection from L. T. and H.T. side and opening of the tap charger , lifting the complete core brunt HT 11 KV copper coils of 3 phase, opening the LT strip winding of 3 phase for cleaning the old insulation etc complete as reqd.

Supply & fixing of following accessories in the Transformer as reqd.a)Copper rod & bushing

b)Internal side copper flexible joint with nut bolt

Servicing of 630/800 Amp 11 KV HT OCB / VCB complete with cleaning, alignment, adjustment of gaps between phase to phase, lubricating all moving parts, adjustment for smooth mechanical operation etc complete as required.

De- hydration of transformer oil for 400 to 1600 KVA with Filter machine at site to maintain the break down value, die electric strength of oil up to 50 KV including providing oil testing facility at site as reqd.

Supply and fixing of 11 KV HT xlpe Aluminium armord cable joint with testing, complete as required. Make Denson a) Indoor Type Joint Size of 150, 185 sq.mm

b) Straight through type Joint Size of 150, 185, 240 sq mm

Servicing of 800 to 3200 Amp ACB Complete with cleaning, alignment, adjustment of gaps between phase to phase, lubricating all moving parts adjustment for smooth mechanical operation etc complete as required.

Replacement of Vacuum interrupter bottle 11 KV 630 Amp i/c removal of faulty vacuum interrupter bottle and also assembling, connection, testing of new Vaccum interrupter bottle complete as required. Make: Alsthom/ Kirloskar

Supplying, Laying and fixing of HT -11 KV, 3 core following size Aluminium Armred power cable i/c connection, Testing etc. complete as required. 150/185 sqmm

Replacement of complete 11 KV VCB apoxy body with dismantling of mechanism parts, burnt out vacuumed interrupter bottle and refixing new interrupter bottle, alignment, greasing and high voltage testing etc. complete as required.

Supply and fixing of 500 Watt Halogen Light for arresting of moisture in HT Panel i/c connection with 3 core 4 sq mm cable (10 mtr aprox)to nearest power point , testing etc complete as reqd

Testing and maggering, p.c testing, insulation testing and rectification of moisture in bus bar, insulator,One in-coming & Two out-going and H.T Cable box, Heating of complete P.T, C.T testing etc. complete as required.

Checking & arresting of Oil Leakages from 630 to 1000 KVA transformer at Site. The job scope as mentioned includes : a) Dismantling of LT cable’s / Bus- Bar’s connections & dismantling of L.T. Bushing Rods. b) Dismantling of Main Top cover / inspection window of Transformer. After draining of oil of Transformer into drums. ( as per requirement) c) Replacement of Cork rings set along with new Teflon rings of all phases for arresting oil leakages. d) Fixing of all terminals & Bus-bar’s connections & making adjustments. e) Replacement of cork gaskets, oil rings of inspection window side & Buckolz relay side & pipe line also for arresting leakages, if any. f) Re-filling of oil into transformer & examining of leakages for improving breakdown value of oil complete as reqd.

Testing and calibration of IDMT relay set having 2 Nos. O/C. 1 No. E/F & instantaneous element by secondary injection method, cleaning the contacts, resetting with required accuracy complete with checking and set right the wiring etc. complete as reqd. i/c testing of the complete system of HT panel for checking the actual working of CTs their wiring, connected IDMT realy, shunt trip system, breaker's tripping system and for any loose connection by primary injection method in all three phases and at each plug setting at actual time multiplier at site with suitable equipment i/c rectify the different in control wiring etc if any complete as required.

Replacement of Rack in & Rack out assembly for 1000 amp to 1600 amp ACB.

Refilling transformer oil, sealed pack drum including transportation charges etc. ( Make : M/S Power oil /Savita with ISI marked having 50 KV R/C)

Supply & fixing of power pack unit having input 220 Volt AC and out put 24/48/110 Volt DC i/c. making inter connection suitable for existing HT system etc. complete as required.

Replacement of existing Henikwon make T.P.N. (3P4W) (100% Neutral) Aluminium conductor SANDWITCH TYPE bus ducts housed in dust and vermin proof 1.6mm thick power coated GI sheet housing, fixed with suitable spaced clamps, expansion joints etc. as required, suitable for 415V 50Hz A.C. supply including dismantling of existing faulty bus-ducting as required. (Make: Henikwon) a) 1600A, S.C withstand 50kA for 1 sec, IP54

Replacement of existing dust and vermin proof powder coated GI sheet adopter boxes for T.P.N. Aluminium SANDWITCH TYPE bus trunking of 1600A, 415V 50Hz A.C. Suply including dismantling of existing adopter box etc. complete as required. (Make: Henikwon)

Dismantling of existing faulty 1600A TPN bus-ducting, temporary arrangements for 1600A three-phase load to ensure smooth supply to central A.C Plant till the faulty bus-ducting is replaced with new bus-ducting

Replacement of existing burnt-out 1600A FP On-load Change-over switch without enclosure (EUROLOAD Havells) with new C.O.S. of same rating, make and model including dismantling the burnt-out/faulty C.O.S., making connections etc. complete as required.

Replacement of existing burnt-out 2000A FP on-load Change-over switch without enclosure (EUROLOAD Havells) with new C.O.S. of same rating make and model including dismantling the burnt-out/faulty C.O.S., making connections etc. Complete as required.

Less credit on account of dismantled material.

DUBEY ELECTRIC WORKS