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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United States of America Patent
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Sep 8, 2020
Grant Date -
May 2, 2019
app pub date -
Oct 16, 2018
filing date -
Oct 27, 2017
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Abstract
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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