DEVICE RECORDING COMMUTATION WEAR OF SWITCHES Russian patent published in 2001 - IPC

FIELD: electrical engineering, high-voltage oil-immersed switches of electrical networks in particular. SUBSTANCE: invention is aimed for elongation of overhaul periods of switches. It is achieved by insertion of diode-resistor converter to calculate power function of short-circuit current. Device has transreactor 3 connected with primary winding to current transformer 2 controlling current of high-voltage oil- immersed switch 1, rectifier 10 whose input is connected through adjustment resistor 4 to secondary winding of transreactor, pulse generator 38-47 connected through coincidence circuit based on elements 30-32, 34-37 to pulse counter 33, storage capacitor 21 connected by make contact 20 of output of fault relay and by break contact 22 of fault relay through linearization converter assembled on compound transistor 23 and elements 24-28 to emitter-base junction of input transistor 30 of coincidence circuit. Voltage divider based on resistors 9, 19 is connected in parallel to output of rectifier. Four diode-resistor networks 5-18 are placed in parallel to one of them, anodes of all diodes are linked to output of rectifier and common point of resistor of voltage divider is connected to input of make contact of fault relay. All cathodes of diodes of diode-resistor networks are connected through additional resistor to stabilizing voltage. EFFECT: prolonged overhaul periods of switches. 1 dwg