Annual Rate Contract Of Tr Set Repairing Work At Stagei , Repairing Of 60Kv / 1600Ma Tr-Set: Common Job Of T-R Set 1 . Complete Draining Out Of Oil & Dismantling And Lifting Of Core & Coil Assemblies 2 . Dismantling Of Rectifier Banks From Transformer . 3 . Primary Testing For Detection Of Fault . 4 . Joint Inspection By Wbpdcl Representative And The Party At Works Will Be Made To Witness The Faults & Further Action Towards Rectification To Be Discussed & Settled For Due Rectification Of Faults . 5 . Cleaning Of Core , Coil & Tank And Associated Clamps Etc . 6 . Reassemble The Core & Coils , Reconnection Of Coils And Cleaning Of Residual Sludge From Core , Tank Etc . 7 . The Tank To Be Cleaned Thoroughly And Painted With Insulation Paint . 8 . Heat Varnishing Of Coils , Checking , Testing And Due Rectification Including Spares , If Required . Fitting & Fixing Of Rectifier Assembly ( Checking Of Individual Rectifier If Required To Be Done ) 9 . Changing Of All Gaskets By New One With Chetak , Cortica , Dog Brand Rc- 70C Neoprene Rubberized Cork-Sheet Gaskets . 10 . Tanking Of Core & Coil Assembly . 11 . Oil Filling- Transformer Oil Of Proper Grade To Be Supplied By Wbpdcl I . E . Bdv Of Oil Tested At 2 . 5Mm Gap Should Be Able To Withstand 40Kv For 01 Min . 12 . Painting Of Outer Surface Tank With Best Quality Of Paint ( Like Ici / Berger Make Smoke Grey Paints ) 13 . Supply Of Nuts , Bolts And Other Spare Items . 14 . Final Testing In Presence Of Wbpdcl Representative . Relevant Test Certificate Has To Be Submitted By The Party . , Rewinding Of Lt / Ht Coil Rewinding Of Lt / Ht Coils , If Found Defective After Testing , The Same Will Be Replaced / Repaired By The Party . Nb:- The Price Should Be Scrap Copper Adjusted Price . , Installation Of New Bridge Rectifier Bridge Rectifier , If Found Defective After Testing , The Same Will Have To Be Replaced By The Party . Nb: 1 . The Bridge Rectifier Must Have Rc Filter Against Each Power Diodes . 2 . The Bridge Rectifier Must Be Imported . , Installation Of New High Freq . Choke High Frequency Choke , Linear Reactor , If Found Absent Or Defective After Testing , The Same Will Have To Be Replaced By The Party . Nb: The Resistance Value Should Be 8 Ohm To 12 Ohm , Installation Of Hvr High Voltage Resistance ( Hvr ) , If Found Defective After Testing , The Same Will Have To Be Replaced By The Party . Nb: 1 . The Resistance Value Should Be 250 Mega Ohm . 2 . The Hvr Must Be Imported . , Repairing Of 72Kv / 1400Ma Tr-Set:Common Job Of T-R Set 1 . Complete Draining Out Of Oil & Dismantling And Lifting Of Core & Coil Assemblies 2 . Dismantling Of Rectifier Banks From Transformer . 3 . Primary Testing For Detection Of Fault . 4 . Joint Inspection By Wbpdcl Representative And The Party At Works Will Be Made To Witness The Faults & Further Action Towards Rectification To Be Discussed & Settled For Due Rectification Of Faults . 5 . Cleaning Of Core , Coil & Tank And Associated Clamps Etc . 6 . Reassemble The Core & Coils , Reconnection Of Coils And Cleaning Of Residual Sludge From Core , Tank Etc . 7 . The Tank To Be Cleaned Thoroughly And Painted With Insulation Paint . 8 . Heat Varnishing Of Coils , Checking , Testing And Due Rectification Including Spares , If Required . Fitting & Fixing Of Rectifier Assembly ( Checking Of Individual Rectifier If Required To Be Done ) 9 . Changing Of All Gaskets By New One With Chetak , Cortica , Dog Brand Rc- 70C Neoprene Rubberized Cork-Sheet Gaskets . 10 . Tanking Of Core & Coil Assembly . 11 . Oil Filling- Transformer Oil Of Proper Grade To Be Supplied By Wbpdcl I . E . Bdv Of Oil Tested At 2 . 5Mm Gap Should Be Able To Withstand 40Kv For 01 Min . 12 . Painting Of Outer Surface Tank With Best Quality Of Paint ( Like Ici / Berger Make Smoke Grey Paints ) 13 . Supply Of Nuts , Bolts And Other Spare Items . 14 . Final Testing In Presence Of Wbpdcl Representative . Relevant Test Certificate Has To Be Submitted By The Party . , Rewinding Of Lt / Ht Coil Rewinding Of Lt / Ht Coils , If Found Defective After Testing , The Same Will Be Replaced / Repaired By The Party . Nb:- The Price Should Be Scrap Copper Adjusted Price . , Installation Of New Bridge Rectifier Bridge Rectifier , If Found Defective After Testing , The Same Will Have To Be Replaced By The Party . Nb: 1 . The Bridge Rectifier Must Have Rc Filter Against Each Power Diodes . 2 . The Bridge Rectifier Must Be Imported . , Installation Of New High Freq . Choke High Frequency Choke , Linear Reactor , If Found Absent Or Defective After Testing , The Same Will Have To Be Replaced By The Party . Nb: The Resistance Value Should Be 8 Ohm To 12 Ohm , Installation Of Hvr High Voltage Resistance ( Hvr ) , If Found Defective After Testing , The Same Will Have To Be Replaced By The Party . Nb: 1 . The Resistance Value Should Be 250 Mega Ohm . 2 . The Hvr Must Be Imported .
