REPAIRS TO HT SWITCH GEARS 4 POLE STRUCTURE TRANSFORMERS AND VCBs INCLUDING EARTHING AT TECH AREA AT DIBT MYSORE UNDER GE I R AND D EAST BANGALORE

Disconnecting HT/LT and earth termination connections from transformer, taking down the transformers from plinth/platform and loading into the vehicle; transporting the same to workshop for carrying out necessary repairs and back reconnecting HT/LT connections at site and charging the transformer on load, commissioning and testing including meggar test at site all as directed by Engineer-in-Charge.

Draining out transformer oil, dismantling top cover along with conservator tank, taking out core and coil assemblies after disconnecting connections, rewinding of burnt out HV/LV coil with same size and type of super enamelled copper conductor and number of turns to get the same rating and insulating material such as paper insulator sleeves, heating etc., putting back the core and coil assemblies into the tank after removing sludge and replacement of HT & LT bushing complete with brass terminal, refixing top cover and conservator including replacement of gasket, nut, bolts & washers (filling new transformer oil having 60 KV dielectric strength and carring out tests as per IS 2026 in presence of Engineer-in-Charge for 200 to 250 KVA capacity transformer complete all as specified and as directed.

Material and labour for rewinding of HT coils with super enamelled copper winding wire of appropriate gauge and proper number of turns to get the same capacity along with insulating materials e.g. leathered paper insulation, cotton tape, empire tape, wooden blocks, PVC sleeves, soldering job, varnishing and heating, drying etc. complete to the satisfaction of Engineer-in-Charge.

All as per Ser Item No.3.00 above but of LT coils with super enamelled Class B copper strip with electrical grade insulating kraft paper all confirming to IEC-60554-3-5 (1984).

Material and labour for Plain Cement Concrete, (1:4:8), type D2 using 40mm graded crushed stone aggregate as in foundation filling and mass concrete for poles /struts / stay assembly complete all as specified and as directed by Engineer-in-Charge.

Material and labour for Plain Cement Concrete, (1:2:4) type B1, using 20mm graded crushed stone aggregate as in coping pedestal to poles including provision of necessary frame work finishing the exposed surfaces even and smooth complete all as specified and directed by Engineer-in-Charge.

Demolition of any old existing brick, stone foundation work built in cement mortar including all quoins arches, pillar etc and removal of debris out side MOD land complete all as specified and as directed.

Material and labour brickwork with sub class‘B’ bricks, straight or curved on plan exc. 6m mean radius built in cement mortar (1:6) complete all as specified and directed by Engineer-in-Charge.

Supply and filling including removal of old Stone with hard broken stone aggregate of size 40 mm to 80mm, clean, free from dust, clay, organic matter or foreign particles, laid to a uniform thickness of 100 mm (minimum) in sub station switch yard area, including levelling, dressing, watering and compacting to proper gradient and slope, complete all as specified and as directed.

Taking down cement plaster on brick or stone walls, etc. including raking out joints, hacking for key, scrubbing down with water etc., complete all as specified and as directed.