Maintenance work of 315 MVA Generator Transformer-6 (SL. No. 6006559), UAT-6A, UAT-6B and ST-5 during U-6 OH period under EMOPH department.

Amount

Maint. work for GT#6 in OH

Job for Isolation of GT#6 from both terminal with dismantling and Removing of Twin Moose Connector & LV side Flexible Connector after clearance

Assistance for Testing work of transformer along with bushing before O/H

Disconnection of oil lines to conservator tank and oil equalizer line form top area & Blanking work prior oil draining at reasonable level

Trf conservator Tank Lifting for air cell healthiness checking with Dry air, pressure test,MOG & both side gasket replacement and placement on base.

Disconnection & refixing of Twelve (12) nos Radiator bank from header and two Bottom header valve line (250NB) for Maint. Of valve by change of O-ring & gasket due oil leakage as per instruction.

Dismantling & Lifting of LV turret from base & Assistance to OEM (BHEL) for rectification of Hotspot in LV turret area and necessary maintenance work like changes of Bolt, Stud, as per instruction and again placement upon base

Dismantling & Fitting of Twelve (12) GT Cooler Fans after OH of Motor (to be done by other agency)

Dismantling & Fixing of Buchholz Relay WTI, OTI, PRV, other flange gaskets (LV or HV side inspection door, equalizing pipe flanges, radiator flanges etc.) with change of gasket/O-ring OLTC diverter top area and any other related tit bit jobs

Oil Filtration by filter machine (To be provided by WBPDCL) till desired parameter of oil due to exposure to air after completion of jobs & oil Filling and proper Venting.

Assistance for Final Testing Reconnection of HV & LV Terminal after completion of maintenance work & Deputation of Skilled Manpower during Charging of GT#6 for 12 hours or more as per situation during unit synchronization.

Maint. work of UAT#6A

Assistance for testing of UAT before overhauling job prior LV, HV side disconnection

Disconnection of oil lines to conservator tank & 100NB equalizer line & Blanking work prior oil draining at reasonable level & Fixing of gasket & O-ring in top area inspection door, Line flanges, PRV, 4 nos CT terminal & allied parts

Job Assistance to OEM for UAT OLTC Servicing / maintenance work as per CTR necessary with oil draining & fill up and new OLTC area gasket fixing

Conservator Tank Lifting for Air Cell Healthiness checking by Dry air,pressure testing MOG & necessary gasket replacement and placement on base with oil line.

Transformer Oil Filtration after completion of jobs as required BDV value due to exposure to air during maintenance works prior Oil Filling

Transformer oil top up as necessary upto conservator level & venting as required & transformer body cleaning, final leakage checking after completion of jobs

Replacement of cable with termination for LV, HV & Neutral side current transformer with gasket replacement job and assistance for testing work

Checking & Cleaning of Neutral grounding resistance bank with cover dismantling & fixing

Assistance for Final Testing after Cooling Fan dismantling & re-fixing after checking/OH, connection of both Terminal

Maint. job for UAT#6B

Assistance for testing of UAT before overhauling job prior LV, HV side disconnection

Disconnection of oil lines to conservato tank & 100NB equalizer line & Blanking work prior oil draining at level & Fixing of gasket & O-ring in top area inspection door, Line flange, PRV, 4 nos CT terminal & allied parts

Job Assistance to OEM for UAT OLTC fixing.Servicing / maintenance work as per of OEM personal (CTR) as necessary with oil draning & fil up & new OLTC area gasket fixing.

Conservator Tank Lifting for Air Cell Healthiness checking by Dry air, pressure testing MOG & necessary gasket replacement and placement on base with oil line.

Transformer Oil Filtration after completion of jobs as required BDV value due to exposure to air during maintenance works prior Oil Filling.

Transformer oil top up as necessary upto conservator level & venting as required & transformer body cleaning, final leakage checking after completion of jobs

Checking & Cleaning of neutral grounding bank, Replacement of cable with termination for LV, HV & Neutral side CT & Assistance for Final Testing, Reconnection of HV & LV Terminal after completion

Drying Out Process of UAT#6B

Disconnection & shifting of 12 nos radiator bank from transformer body and proper preservation of each till completion of drying process.

Full Oil Down from main tank and storing in oil tanks for Transformer Dry out

Heating & Drying out of Transformer, Oil filling under vacuum as per proper procedure with Dismantling of transformer bushings if required, all radiator bank AND Alumina Chamber, of transformer pipe line, bellows between transformer & bus duct etc

N2 sealing & Vacuum process of 20MVA UAT #6B with Disconnection, Dismantle & other related jobs along with Blanking & preservation of cannibalized components with N2 gas dew point -70°C

Assemblimg of all parts after successful completion of dry out & vacuum process and Oil Filling inside tank with fixed radiator bank.

Maint. Job for ST#5

Assistance for Testing work ST#5 with bushing before O/H, LV, HV side disconnection

Disconnection of oil lines to conservator tank & 100NB equalizer line & Blanking, prior oil draining at level & Fixing of gasket & O-ring in top area inspection door, Line flanges, PRV, 9 nos CT terminal & allied parts.

Conservator Tank Air Cell Healthiness checking by Dry air, MOG checking & necessary gasket replacement after lifting from base and placement and Assistance to OEM for OLTC servicing

Dismantling of transformer pipe line from main tank, Buchholz Relay etc if required and Change of gaskets such as Man-hole gaskets, WTI & OTI Gaskets, PRV, Buch. Relay gaskets, (LV side inspection, equalizing pipe flanges,radiator flanges etc.)

Transformer Oil Filtration after completion of jobs still as required BDV value of oil due to exposure to air during maintenance works prior Oil Filling.

Transformer Surface cleaning oil settling, venting Jobs after completion of oil filtration, & Assistance for Final Testing, Reconnection of HV & LV Terminal after completion

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