Instrument transformer VFZ series

cast resinprotectionfor outdoor service

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) 12 24 24 Rated insulation level (kV) 12/28/75 24/50/125 Rated primary voltage (V) from 3000 up to 20000 Rated secondary voltage (VI 100 or 110 Secondary tap upon request Accuracy class 02:05:1:3 Rated burden of measuring winding (VA) 25 up to 180 10 up to 100 Continuous thermal current of secondary winding (A) 5 Rated voltage factor and permissible duration 1.2 x Un Rated frequency (Hz) 162/3:50:60 Class of insulation E Weight (kg) 40 45 30 Creepage distance (mm) 872 1084 774 Creep per kV line-to-line voltage (cm/kV) 726 4,52 3,1 Cantilever strength (N) >5000 Maximum altitude of installation (m) up to 1000 Ambient temperature (:Q - 25 up to + 55