THE WORK OF INTERNAL INSPECTION AND CENTRIFUGING OF 160 MVA TRANSFORMER AT 220 KV SUB STATION RAMPUR UNDER ELECTRICITY TRANSMISSION DIVISION RAMPUR

Amount

Inspection of 160 MVA T/F

Drain out of complete Transformer oil in empty oil tanker for internal inspection of Transformer.

Opening of inspection plate, HV LV Bushing and opening of HV/LV side jumpers and other associated works

Internal inspection of 160 MVA Transformer, checking of HV/LV side winding lead of Transformer, tightening of Joints, connections and all other components inside the main tank of Transformer.

If 160 MVA Transformer found healthy or repair at Sub-Station then following work is to be carried out.

Cleaning of slugs and flushing of Transformer core winding in main tank with hot Transformer oil through centrifuging machine.

Closing of inspection plate, HV LV Bushing and jumpering of HV/LV side jumpers and other associated works

Complete evacuation of 160 MVA Transformer main tank and filling of Dry air/Dry Nitrogen of dew point -50˚ C or better in vacuum up to pressure of 0.25 Kg/Cm2 and the again evacuating the Transformer tank after required time interval (approx 12/24 Hrs.) using centrifuging machine the work shall be including connecting pipe of machine as required measuring Dew Point values of N2 after every cycle till the required value is achieved.

Create the vacuum inside the 160 MVA Transformer before filling the Transformer oil including vacuum standing test. Note; Vacuum shall be maintained for 24 hrs. minimum at 01 torr.

Centrifuging of Transformer oil in 20 KL oil tanker by ultra heigh Vacuum oil filtration plant after connecting the centrifuging the pipe with oil tanker to filtration plant including taking the BDV value of oil periodically till the required value is achieved. (Centrifuging machine shall be provide by the contractor).

Filling of centrifuged Transformer oil from oil tanker to Transformer main tank and top up in conservator tank up to required level.

Testing of transformer oil of main & OLTC Tank oil sample collected in standard sample bottles at CPRI / Any Certified testing lab including cost of transportation. (after centrifuging of oil of 160 MVA T/F) i-Breakdown Voltage Test ii-Moisture Content Test

NOTE :- 1)- Actual work to be performed will be decided after internal inspection done on site in the presence of SDO / EE, ETD-Rampur and measurement will be done accordingly. 2)- Work has to be completed within a week time from date of LOI/Agreement.

Gupta Elect and Engg Works (BID ID -5187833)

BARKATI ENTERPRISES (BID ID -5186321)