Instrument transformer VFE series

cast resinfor outdoor servicemedium-voltage

These are voltage transformers type for outdoor installation. The resin is cycloaliphatic and outdoor proof. Because it is vacuum impregnated and cured under a long thermally controlled cycle, an insulating material of high electrical and mechanical qualities, resistance to ultraviolet rays and the effects of tracking, erosion and ageing, is thus obtained. For an increase in the creep age distance, the insulation body is equipped with double sheds, the shape of which has been determined aftermany years of research. They contain up to three windings for revenue metering and protection purposes. An extra 100/3 V winding can be provided in case the earth fault detection is demanded. Their cores are constructed from high quality siliceoussteel laminations. If an additional ratio is requested, thiscan be achieved by an intermediate terminal at the secondary coil or an additional coil. We also produce "railway type" voltage transformer with low resistance shield. Highest voltage for equipmet (kV) 24 36 Rated nsulation level (kVJ 24/50/125 36/70/170 Rated pnmary voltage (V) from 3000/V 3 up to 30000/v'3 Rated secondary voltage (V) 100V3 or 110/V3 Secondary tap upon request Accuracy class 02:05:1:3 Rated burden of measuring winding (VA) 15 up to 200 Rated voltage of open delta winding (V) 100/3 or 110/3 Accuracy class 3P:6P Rated burden of open delta winding (VA) 15 up to 200 Continuous thermal current of secondary winding (A) 7 Continuous thermal current of tertiary wtndrig (A) 8 Rated voltage factor and permissible duration 1.9xUn/8h Rated frequency (Hz) 16 2/3:50 : 60 Class of insulation E