Abstract
In low-voltage networks, earth fault loop impedance (EFLI) measurement is the basis for assessing the effectiveness of automatic disconnection of supply. Such a measurement is performed during initial and periodical verification, especially in a TN low-voltage network. Nowadays, due to widespread application of residual current devices (RCDs), such test is difficult in many circuits because RCDs operate during the test. In this paper a method of EFLI measurement, without unwanted tripping of RCDs, is proposed. This method enables the measurement of EFLI using a relatively high value of full-wave testing current. It is recommended in terms of accuracy of the measurement.
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