TROLLEYBUS LEAKAGE CURRENT INDICATOR Russian patent published in 1997 - IPC

FIELD: city transport; fault detectors of trolleybus high voltage equipment with grounded supply system. SUBSTANCE: pulse generator, blocking capacitor, rectifier, current meter-limiter and output filter with corresponding couplings and compensating voltage control logic unit are introduced into compensating voltage controlled source. Compensating voltage controlled source uses as supply source the contact system and it operates on principle of conversion of DC voltage into ac voltage and subsequent rectification of this voltage. Compensating voltage forming unit and indicator output current limiting unit are isolated to improve safety. Continuous automatic monitoring of device serviceability is provided owing to introduction of control logic unit. EFFECT: improved safety of passengers. 4 cl, 2 dwg