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In the paper, the intermittent earth faults and their detection have been discussed. The intermittent fault belong to the most difficult detectable one due to its low and unstable measuring signals. The discussion has been carried out on the true fault recorded in the typical MV distribution network. It is shown that the criterion values applied, up to now, to the ground-fault protections can be ineffective...
In this paper efficiency of the different types of the admittance criteria is described during faults with high value of the fault resistance. The two types of fault are considered: high- ohm resistance in the fault loop and unbalance of the phase load caused by discontinuity of the line feeder with simultaneous occurrence of the ground-fault located behind the gap. Values of the zero sequence signals...
The overall length of medium voltage (MV) lines, both cable and overhead, exploited by polish distribution companies was 234 827 km at the end of 2003. Every year the percentage share of cables in electrical power network is increasing. Very similar situation can be observed for insulated or covered overhead lines, which are an alternative to bare conductor lines. The evaluation of reliability of...
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