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Method and detection device for detecting a high-impedance ground fault in an electrical energy supply network with a grounded neutral point
Method and detection device for detecting a high-impedance ground fault in an electrical energy supply network with a grounded neutral point
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机译:在具有接地中性点的供电网络中检测高阻抗接地故障的方法和检测装置
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摘要
A method detects a high-impedance ground fault in an electrical energy supply network with a grounded neutral point. A test signal is fed via a detection device into the energy supply network, the test signal has a frequency which differs from the network frequency of the energy supply network. To enable a reliable detection, with low equipment costs, of high-impedance ground faults in energy supply networks with a grounded neutral point, a three-phase test signal is fed into the phase conductors of the energy supply network as the test signal. A measuring signal which indicates the residual voltage of the test signal is generated with the detection device. The residual voltage is compared with a threshold value using a test device of the detection device, and the presence of a high-impedance ground fault is detected if the residual voltage exceeds the threshold value.
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