22/ EE/PMD/PHED OF 2023-2024/Sl5

Amount

Testing and inspection of 150 KVA HT AVR (physical checking, IR value, Magnetic balance,Turn ratio, core loss,copper loss, High voltage test, double voltage double frequency, vector group, OTI, WTI,Buchholz Relay operational test)

Disconnection of power line of the damaged 150 KVA HT AVR, complete drained out of AVR oil, opening of the Top cover,then disconnect internal connection in-between regulator & auto step up-down core coil assembly and buck boost unit for taking out for fault finding.

Loading, carrying the auto step up-down core coil assembly & buck boost unit from the above site to Kollkata work shop by hired vehicle and unloading the same as per direction. ( approx 350 km)

Lifting of Core Coil Assembly from tank inside by the help of chain pulley block as per direction

Removing of core clamp & yock plate, then dismantling of HT & LT winding of Buck Boost unit of HT AVR

Auto Step Up-Down unit of HT AVR “B” phase winding construction are made with 4 nos. HT coil & 1 no LT coil. Complete HT & LT coils conductor insulation replaced by new insulation

Charges for complete Replacement of copper of 2 Nos. HT coil (B) out of 4 Nos. HT Coil & 1 No. LT Coil of Step UP-Down Transformer ( (this includes the deduction cost of old and damaged copper material of 42 kg @ 450.00 per kg)

Re-insulation of 2 Nos. LT tertiary coil of Auto Step Up Down Transformer

Winding charges of 12 Nos. HT cross over coil and 3 Nos. LT tertiary coil of Auto Step Up- Down Transformer

Supply & Replacement of all insulating materials by new insulating materials like as craft paper, presspan, cotton tape, sleevings

Supply all kinds of gaskets for AVR, Oil Seals for HV & LV bushing

Changing of all kinds of gaskets and Bushing as per sample of Transformer with the aid of necessary tools by engaging skilled and unskilled labours as per direction of EIC

Replacement of all Oil Seals, Gaskets of HV & LV bushings (AVR)

Preparation of Core assembly and after that reassembly of HV & LV coils for Auto Step Up Down Transformer

Jointing of Cu. Busbar (HV, LV & Tertiary) Using of brazing materials

Charges for drying the core and coil assembly through a very efficient drying oven which ensures extraction of moistures to zero level.

Primary testing of core & winding assembly before tanking

Supply of new transformer oil as per IS 335-1993 at site as per direction including carrying and transportation complete (make Power oil/approved make)

Oil Filteration (AVR + VLE unit)

cleaning core-coil assembly & inside the tank, filling new & old Transformer Oil inside the tank chamber & top up & completed all the connections

Checking of control circuit

Transportation of the repaired unit (approx 350 Km) by hired vehicle including loading, unloading

Assembling the core coil assembly of Auto Step Up-down & Buck Boost Unit by the help of Chain pully block at site

Testing of the HT AVR (IR value, Magnetic balance,Turn ratio, core loss,copper loss, High voltage test, double voltage double frequency, vector group, OTI, WTI,Buchholz Relay operational test)at site before power charging

Installation of the transformer at its position, making all electrical connections and testing commissioning the same

Add GST @ 18%

Add CESS @ 1%

H.K.DAS & CO.

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