AC/DC IT Systems
In the chapter general description of “mixed” unearthed networks is given. Formulas for wire-to-ground voltages and ground fault currents on both sides of AC/DC system are derived. Few examples of voltage and leakage currents waveforms recorded in a “mixed” network are presented. Problems of misoperation of devices are dealt with. Several examples of such cases are analyzed and required insulation resistance levels are evaluated. Methods of insulation equivalent resistance measurement are described. Adaptation of a well-known “three voltmeters” procedure is explained.
KeywordsFault Current Earth Fault Ground Fault Single Phase System Ground Voltage
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