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METHOD AND CIRCUIT ARRANGEMENT FOR THE DETECTION OF GROUND FAULTS ON ELECTRONIC TRIPS FOR LOW-VOLTAGE CIRCUIT BREAKERS COMPRISING SERIALLY CONNECTED MEASURING AMPLIFIERS
METHOD AND CIRCUIT ARRANGEMENT FOR THE DETECTION OF GROUND FAULTS ON ELECTRONIC TRIPS FOR LOW-VOLTAGE CIRCUIT BREAKERS COMPRISING SERIALLY CONNECTED MEASURING AMPLIFIERS
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机译:检测带有串联连接的测量放大器的低压断路器的电子跳闸的接地故障的方法和电路布置
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摘要
One problem during the detection of ground faults resides in the fact that the measuring amplifiers have a great amount of tolerance regarding the amplification factor thereof, resulting in a substantial error when errors are handled by means of software. According to the disclosure, the output signals of the measuring amplifiers are summed up phase by phase in a pulse-modulated manner in a summing amplifier. The duration of the pulses generated by the trip are controlled in accordance with the amplification factor of the respective associated measuring amplifier while the output of the summing amplifier represents a ground fault monitoring signal.
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