Cast Resin Transformer

Vacuum Pressure Impregnation(VPI)

A full range of dry-type transformers with primary voltages through 72.5 kV built according to all major standards including IS, IEC and ANSI. are offered to minimize environmental contamination and fire hazard. These transformers meet strict parameters with respect to electrical system demands and functioning in areas with extreme climate condions. The dry-type transformers are moisture-proof, suitable for operation in humid or heavily polluted environment. They are the ideal for operation in environment with humidity higher than 95 % as well as at temperatures down to -25 °C. There is less space and less civil work needed, no special safety features are required (fire detecon). They are maintenance free and extended life is due to low thermal and di-electric ageing Looking at these advantages customers are specifying dry-type transformers more frequently.

VPI Dry Type Transformer

HV & LV wound coils are separated by means of fiber glass cylinders & supported on the frame by special porcelain supports. HV coils are made in disc form, using enameled & fiberglass covered copper strips.

All conductors are treated with Polyesteramide resin during covering stage to achieve inter-turn di-electric strength of 6-8KV & eliminating trapped mechanical forces during the thermal operating cycle.