Abstract
For protection against single-phase earth faults (SPEF) in medium voltage 6–10 kV distribution networks, operating with isolated neutral or neutral grounding through high-resistance resistor, simple and reliable overcurrent zero sequence protections (OZSP) have been most widely used [1], [2], etc.]. Overcurrent protections based on higher harmonics (HH) of zero sequence current 3i 0 of protected connection (OZSPHH) have received the widest application in compensated networks [3], [4]. The disadvantage of all OZSP performances is a significant effect on the efficiency of its operation of zero-sequence transient currents with arc intermittent earth faults (AISPEF), limiting selectivity and sensitivity and, therefore, possible application scope of the above protection [5], [6], etc.]. The main OZSPHH disadvantages are significant influence on the conditions of its selectivity and sensitivity of HH level instability in the current of compensated network limiting possibilities of its application, as well as protection blocking for AISPEF, to prevent unnecessary trips. At the same time, it is known that the occurrence of AISPEF accompanied by dangerous overvoltages for network is also possible in compensated networks with large compensation deviations possible in real operating conditions [7].
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