DEVICE FOR VERIFICATION OF MEASURING CURRENT TRANSFORMERS Russian patent published in 1998 - IPC

FIELD: electrical engineering. SUBSTANCE: device has multiple-discharge inductance current divider with parallel connection of discharge circuits. It is designed as complex inductance current divider and current comparator which serves as detector of difference in conversion factors of tested transformer and inductance current divider. Inductance current divider has high- voltage, isolating and low-voltage parts. High-voltage part of current divider has at least one stage and is connected to primary current power supply in series with tested current transformer. Its screen is connected to high-voltage wire. Isolating circuit is designed as single-stage or multiple-stage inductance transforming current divider which conversion factor is equal to one. Isolation conforms to service voltage. Primary winding is connected to output winding of high-voltage part. Housing is connected to low-voltage wire. Low-voltage part of inductance current divider has at least one stage and is connected to secondary winding of isolating inductance current divider. Screen is connected to low-voltage wire. Current comparator with controlled arms has two in-phase windings, one quadrature winding and one indication winding. One in-phase winding of current comparator is connected to output winding of low-voltage part of inductance current divider. Second in-phase winding of current comparator is connected to secondary winding of tested current transformer through load resistors. Quadrature winding of tested current transformer is connected to secondary winding of tested current transformer through phase shifting capacitors and additional current transformer. Indication winding of current comparator is connected to zero-phase detector. EFFECT: possibility to verify current transformer under service voltage at home, decreased cost of verification, increased precision of operation. 1 dwg