WOUND PRIMARY CTs 11 kV, 22kV and 33kV STC up to 40kA / 3s 2 or 3 cores as per requirement
WIMDOW TYPE CTs 11 kV, 22kV and 33kV STC up to 40kA / 3s 2 or 3 cores as per requirement
VOLTAGE TRASNFORMER 11 kV, 22kV and 33kV Voltage Factor = 1.2cont./1.9 for 8 hours 1 or 2 secondary windings as per requirement With and without HV Fuse
FEATURES
Liquid epoxy system is used
Low viscosity liquid resin and hardener is used. System with platicizer - assured flexibility and thereby have better temperature cycle performance and crack resistance Suitable for temperature range -40to+80 °c Room temperature processing - better manufacturing friendly Better environment friendly
High tracking resistance and better aesthetics
Moulds are made from steel All Moulds are diamond polished and hard chrome plated Application of uniform and thin layer of liquid mould release agent
Ensuring non-painted, natural smooth surface of high tracking resistance on very casting.
Casting Process
Every mould assembly (with active part inside) undergoes heating and degassing to ensure effective drying of all insulating materials used. Casting is made in a signle casting process unoer controlled temperature and vacuum. Steady, pre-oehneo flow rate of ipoxy maintained ouring encapsulation.
Primary winding and termination - CTs
Primary winding is made in double disc with rectangular, multiple paper covered copper conductor which offers high mechanical strength against the forces developed during dynamic currents. Winding is very compact and consistent dimensions achieved Winding is terminated in to specially designed sockets . The joints are high temperature soldered and epoxy entering to electrical joint is totally voided. Joints are designed to meet STC up to 40 kA/ 3s and also to meet continuous currents up to 2000 A.
Primary (HV) winding - VTs
Primary winding made trapezoidal with continuous reduction of turns which offeres high mechanical tability of the winding and high strength against impulse and surge voltages. High quality kraft paper insulation is used for inter-layer insulation The coil is dried, de-gassed and then impregnated with low viscosity resin under controlled temperature, vacuum and pressure.
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