FOR REPAIRING OF 25 KVA, 63 KVA AND 100 KVA DAMAGED SHELL TYPE THREE PHASE T/F AT LESA WORKSHOP, ALIGANJ.

Amount

Handling and Dragging of damaged Transformer from stacking yard to repairing hall with accessories

Cutting/Opening of top cover plates & fittings of the transformers, draining of its oil & Detanking of core & coil Assembly.

Dismantling of core & coil Assembly and its cleaning.

Dismantling of Shell Core and coil assembly. Removing of HV and LV Leg coils for assessing its reuse, reuse of major insulating material if possible, checking and recording of physical dimensions of coil.

Making of complete HV & LV leg Alu. Leg coils identical to original one with same number of turns, weight etc providing super enameled/DPC conductor/ Strip confirming to IS 1971 153 in place of old and damage coil. Alu. coil, wire strip will be provided by the department. All coil assembly of identical voltage shall be interchangeable without requiring any special equipment. Shell Coil shall be supported between adjacent sections by insulations (flick Paper) Paper, spacers, beamers and other insulations. Rewinding shall be arranged to ensure free circulation of oil to reduced hot spots in winding. The insulation of coil shall be reated with suitable insulating, varnish or equivalent compound to develop the full electrical strength of.

Assembly of Shell core (Three Limbs) coils and fitting of top and other parts. Replacement of insulation such as press board, craft paper, making support between adjacent section by insulating spacers and wrapping etc. shifting of repaired core coil assembly and placement inside the oven for proper dry out.

Shifting and keeping the assembled core& coil etc. in OVEN from the repairing hall.

Dragging of transformers tank from the repairing hall to washing area and its complete washing, cleaning, removing of rust and carbon etc.

Repairing of damaged T/F body/radiator by electric/gas welding complete in all respect for arresting oil leakage.

Painting of inner side of T/F tank with heatproof zinc chromatic paints in two coats after providing primer of red oxide paint.

Dragging/shifting out completely dried empty tank after painting to repairing hall.

Taking out core and coils assembly from the OVEN and shifting to repairing hall.

Welding/Tightening the top cover after tanking of core and coil assembly into painted tank and tightening of assembly into the tank and fitting all accessories of transformer and filling of oil.

Spray painting of transformer tank from outside with supper enamel synthetic Grey paint in two coats after providing primer of red oxide paint & Package rate per transformer the supply item to be provided by the contractor for repairing of transformer Details of supply item are annexed here to. Like - Oxygen gas, M-Seal, Araldite, Paint and Brush for lettering, Welding Electrode Gas cutter etc.

Dragging/shifting of repaired T/F near to the test cabin/testing place and dragging /shifting T/F to yard after testing and its stacking at identified place.

Package rate per transformer of supply item to be provided by the Contractor for repairing of transformer. Details of supply items are annexed hereto.

ANVESH ELECTRICALS

A. A. ENGINEERING CO.