ELECTRICAL WORK

Amount

Dismantaling & safe stacking of Mulsifire system of the transformer.The scope of the work involves opening of nuts , bolts, pipes, nozzles etc. and stacking of all the dismantled items at proper place along with other associated works.

Shifting & Carriage of 1 Nos. Oil storage Tank (50KL) & empty T/F oil drums. The scope of the works involve shifting & loading of oil Tanks & empty T/F oil at proper place alongwith other associated work.

Removal of jumpers of HV/LV/IV side of the transformer,the scope of work involves opening of bolts & nuts and removal of jumpers,bushing clamps etc.

Draning of T/F oil from transformer into empty oil tanks/oil drums and stacking them at proper place.

Arrangement of 1 No. 20-35 Ton capacity mobile crane alongwith crane operator of work at site, with all cost of material,consumable such as Diesel,Lubricating oil etc. till the completion of gasket replacement work.

Complete dismantalling of transformer.The scope of work involves removal of conservator tank radiators,Bushings,Turret,Complete oil pipe line ,cooling fan,OLTC drive Mechanism ,Oil pumps & associated pipe line ,Flange valves etc. Stacking of all the dismantled parts all proper place along with other associated works.

Lifting of main tank Body of transformer ,the scope of works involve opening of nuts,bolts of Rim Gasket of main tank body ,Jacking & lifting of top cover,Fixing of limiters and pipe stoppers between top cover after completion of the Replacement of gasket as per details at Sl. No 8 alongwith other associated works.

Replacement of Rim Gaskets,cleaning of Rim surface,Fabrication of Rim Gaskets out of 20mm thick Rubber Gasket of Konica/Troboze/Nu-cork make having temperature bearing capacity 380 degree Celcius and fixing the Gaskets with adhesive at Rim surface.

Replacement of old Gaskets from different parts of the transformers as per details below.The scope of works involves removals of gaskets,cleaning of surface,Fabrication of Gaskets of appropriate size out of gaskets of thickness 12/10/8/6 mm of Konica/Nu-cork make and fixing the Gaskets with adhesive along other associated works. Gaskets of 400kv Turret (Top & Bottom)

Gaskets of 400kv Bushings.

Gaskets of 220kv Turret (Top & Bottom)

Gaskets of 220kv Bushing.

Gaskets of 33kv Turret (Top & Bottom)

Gaskets of 33kv Bushing.

Gaskets of 33kv Bushings of Top Seal

Gaskets of Neutral Bushing Turret

Gaskets of Neutral Bushing Turret (Top & Bottom)

Gaskets of main tank inspection cover

Gaskets of HV/LV/IV/N Bushing cover.

Gaskets of CT Connection Plate cover

Gaskets of PRV Flange of main tank

Gaskets of main oil pipe line between main Tank & radiator.

Bucholz relay Gasket

Teflon Washer for air releasing plug

Gaskets of oil pipe line between main tank & conservator.

Gaskets of oil surcharge Relay & oil pipe line

Gaskets of OLTC Top Plate

Gaskets of drain Valve/sampling Valve1'' Dia.Pipe

Gaskets of drain Valve 2'' Dia.Pipe

Gaskets of drain Valve 3'' & 4'' Dia.Pipe line

Gaskets of drain Valve 6'' Dia.Pipe line

Gaskets of 150NB Oil pump

Gaskets of flow Meter (Indicating 10mm thickness)

Gaskets of pipe line flange 100mm

Radiator gaskets (180x180mm size in square shape)

Radiator valve gaskets (180x180mm size in square shape)

Header joint(440x440mm size in square shape)

Air release nylon washer on radiator cap

Gaskets of M.O.G Indicator

Gaskets of convertor tank

Gaskets of NRV

Replacement of defective Nuts & Bolts of different sizes as required

Draning out the transformer oil from OLTC Chamber,overhauling of Diverter switch then flushing with hot T/F Oil in the chamber.

Cleaning and Flushing of the transformer winding in main tank with hot T/F oil Through centrifuging machine.

Complete eraction of the transformer.The scope of work involve Refitting All the dismantalled part of the transformer such as Radiator,Conservator tank,Bushing,Turrets,Connecting oil pipe lines,cooling fan,OLTC drive Mechanism,oil pumps & associated pipe lines etc. The work also involves attending the oil leakage if any after Refilling of Transformer oil under Vaccume in the tank as per details at Sl. no 15.

Complete Evacuation of main tank of the transformer and filling of dry Nitrogen/Dry air of dew point-60 degree celcius or better in vaccume upto pressure of 0.25g/sq cm and the again evacuating the transformer Tank after required time interval (approx 12/24 Hrs) using certified machine.The scope of work involves Measuring dew point values of N2 after every cycle till required value is achieved.

Performing the Vaccume stand test.The scope of work involves to create the vaccume inside the transformer up to 70 hg mm for evacuation of moisture from core & winding and maintaining the pressure at least for 72 Hrs.

Centrifuging of oil filled in oil tanks,Un-interrupted till the desired BDV value of the oil is acheived, Filling of transformer oil into the main tank and Radiator from oil tank as per details at Sl. No 16 then centrifuging & circulation of the oil transformer,Un-interrupted till the desired BDV value of the oil is acheived including recording of all the parameters such as Temperature,vaccume,insulation Resistance etc. Hourly.Centrifuging Machine,its operator,all associated T & P etc. shall be arranged by contractors at his own cost.

Filling the transformer oil into the main tank and radiators from oil tanks under vaccume after performing the vaccume stand test successfully as per details at Sl. No.14.

Jumpering of HV/IV/LV side Bushing of the transformer.The scope of work involves tightening of Bushing Clamps with appropriate sizes Bolts & Nuts including replacement of clamps,Jumper etc. as required.

Refitting of Mulsifire System on the transformer.The scope of the work involves shifting of dismantaled parts of mulsifire system such as pipe lines,Valves,Accessories etc. to the site and connecting them properly with successful operation of the Mulsifire System.

Gupta Elect and Engg Works

Meena Elect and Engg Works