H - Electricity – 02 – H
Patent
H - Electricity
02
H
324/58.03
H02H 3/08 (2006.01)
Patent
CA 1287110
ABSTRACT SYMMETRICAL FAULT CURRENT DETECTOR Excess currents due to faults in an electrical power system are generally larger than excess currents due to the magnetisation of distribution transformers: discrimination has hitherto relied on a threshold detector. Magnetising currents are however, asymmetrical whereas fault currents are symmetrical. This specification discloses a detector which can detect symmetrical current waveforms on a conductor 1 and thus discriminate between a fault and a magnetising excess current. A resistor 4, placed across the output terminals of a bridge rectifier 3 has a resistance selected so that the voltage across it exceeds the breakdown voltage of trigger diodes 7 and 8 when the current in conductor 1, in any half cycle, exceeds a desired maximum. Capacitors 13 and 14 will thus only both charge up in response to a large symmetrical current: a logic control 23 is connected via lines 21 and 22 to detect such a condition.
508184
Aubrey David Richard
Jameson Ian
Ea Technology Limited
Ridout & Maybee Llp
LandOfFree
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