SHORT-CIRCUIT CURRENT DETECTOR Russian patent published in 1995 - IPC

FIELD: detection and indication of short-circuit currents in buses of 6-10 kV lines of transit substations. SUBSTANCE: detector has sensor unit 1, actuating unit 2, indicating unit 3. Sensor unit is built up of two similar assemblies each built around reed relay, connected in parallel and installed in cell under insulator at point of their attachment to case. Actuating unit has self-reset circuit of detector with network setting specified self-reset delay time; indicator operation network responding to voltage application to faulty cable, and incorporates two-position polarized relay, diodes, thyristor, capacitors, resistors, voltage regulator diodes. Indicating unit is portable device that has light-emitting diode connected through fourth limiting resistor to power supply. Indicator is isolated from main 6-10 kV line and is safe in operation. EFFECT: improved design. 2 cl, 1 dwg