Maintenance work of 315 MVA BHEL Make Generator Transformer-5, 20 MVA UAT- 5A and 5B and 40MVA ST-3 and ST-4 during U-5 OH periods under EMO dept., STPS.

Amount

Generator Transformer #5, Make- BHEL : MVA-189 /252/315, Voltage(HV)- 235 KV, Voltage(LV) - 16.5 KV, Current(HV) - 774.81 Amp, Current(LV) -11035.21 Amp , Sl. No:6006263

Isolation of GT #5 from both LV & HV terminal with necessary dismantling and Removing of Dropper Moose Conductor & Flexible Connector

Jobs to facilitate the Testing work of transformer along with bushing before O/H & after O/H by testing dept.

Disconnection of oil lines to conservator tank and radiator side & equalizer line & Blanking work prior oil draining at reasonable level and Conservator Tank Air Cell Heartiness checking by N2/ Dry air, MOG checking & necessary gasket replacement after lifting from base.

OCTC Diverter Chamber lifting from base after disconnection and assistance for Servicing/maintenance work (change of O-ring & Gaskets) as per recommendation of OEM personal (BHEL) and Servicing Job of Off circuit Tap changer drive mechanism for enabling smooth Operation in all taps position and job assistance to OCTC testing.

Y-phase HV turret lifting for arresting the oil leakage at bottom if possible without disconnection of Bushing.

Dismantling of HV Neutral Bushing from base for rectification oil leakage and replacement if required.

Dismantling & Lifting of all LV Bushing from base for rectification of oil leakage due to trouble in oil seal and assistance to OEM for rectification of Hotspot in LV turret area and necessary maintenance work like changes of Bolt, Stud, as per recommendation.

Disconnection of TWENTY FOUR (24) Nos Radiator bank from header for requisite Maintenance of valve by replacement of o-ring & gasket.

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, Buchholz Relay gaskets, other flange gaskets (LV side inspection, equalizing pipe flanges, radiator flanges etc.) If required.

Twelve nos Cooler Fans dismantling & Fitting after OH of Motor, to be done by other agency at STPS premises.

Oil Filtration after completion of jobs still achieving desired parameter of oil due to exposure to air during maintenance works prior Oil Filling.

Transformer Surface cleaning, checking, oil settling, venting Jobs after completion of oil filtration & filling work

Reconnection of HV & LV Terminal after completion of maintenance work & satisfactory transformer testing.

Deputation of Skilled Manpower during Charging of GT#5 for 12 hours or more as per situation during unit synchronization.

BHEL Make UAT#5A & UAT#5A: 16.5/6.6 KV, 20/16 MVA, Current (HV)-699.81A, (LV)-1673.479A Sl. No:2017185 & 2017186

Isolation of Trf.from both LV & HV terminal and Necessary Jobs to facilitate the Testing of transformer before for both trf maint. Job

Disconnection of oil lines to conservator tank and radiator side & equalizer line & Blanking work prior oil draining at reasonable level for both

Job Assistance to OEM for OLTC Servicing / maintenance work as per recommendation of OEM personal (CTR) for both UAT.

Conservator Tank Air Cell Healthiness checking by N2/ Dry air, MOG checking & necessary gasket replacement after lifting from base.

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

Transformer Surface cleaning, checking, oil settling, venting Jobs after completion of oil filtration & filling work and HV, LV connection.

BHEL Make ST # 3 & ST # 5: 220/6.9 KV, 40/25 MVA, Current (HV)-104.973 A, (LV)-2091.55/1255.11A YNy0d1 Sl. No: NA & 2018453

Isolation of Trf.from both LV & HV terminal and Necessary Jobs to facilitate the Testing of transformer before trf maint. Job for both

Disconnection of oil lines to conservator tank and radiator side & equalizer line & Blanking work prior oil draining at reasonable level for OLTC disconnection

Job Assistance to OEM for OLTC Servicing / maintenance work as per recommendation of OEM personal (BHEL) for both Station Transformer.

Conservator Tank Air Cell Healthiness checking by N2/ Dry air, MOG checking & necessary gasket replacement after lifting from base.

Replacement of existing Air Cell inside conservator tank by new one after lowering the main tank oil up to required level for ST#3 only if found damaged.

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

Transformer Surface cleaning, checking, oil settling, venting Jobs after completion of oil filtration & filling work and HV, LV connection.

SHREE ABIRAMI ENGGINEERING WORKS

MESSON ELECTRICALS