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ALL-CURRENT-SENSIVE ERROR CURRENT DETECTING DEVICE WITH ALTERNATIVE AND PULSE ERROR CURRENT DETECTING DEVICE, WHICH CANNOT BE INFLUED BY THE SAME ERROR CURRENT
ALL-CURRENT-SENSIVE ERROR CURRENT DETECTING DEVICE WITH ALTERNATIVE AND PULSE ERROR CURRENT DETECTING DEVICE, WHICH CANNOT BE INFLUED BY THE SAME ERROR CURRENT
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机译:带有交替错误和脉冲错误电流检测设备的全电流敏感错误电流检测设备,不能用相同的错误电流来检测
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摘要
The invention relates to a fault-current detection device having a summing current transformer arrangement (1) which has primary windings (2) for a circuit to be monitored and has a secondary winding (3). DC fault currents result in the converter being premagnetised, which premagnetisation has a significant adverse effect on the tripping of the fault-current detection device for alternating fault currents and pulsating direct false currents. This defect is remedied by shifting the magnetisation characteristic by, for example, loading the secondary winding (3) with a resistor (4). IMAGE
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