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This paper discusses the maximum ground fault resistance, which can be tolerated by a distance relay with Mho characteristic applied at the source node of a distribution feeder. This resistance is defined as the boundary fault resistance which is the boundary of the distance relay correct discrimination between in-zone and out-of-zone faults. The robustness criterion is defined based on the boundary...
This paper discusses the variation of distance relay robustness criterion as a function of Mho characteristic shifting angle as well as power system conditions. Boundary fault resistance is the maximum tolerable fault resistance which distance relay can discriminate between in-zone and out-of-zone faults. The robustness criterion is defined on the basis of the boundary fault resistance. In order to...
Fault resistance is a source of error for distance relays by the means of deviating the measured impedance from its actual value. The presence of the fault resistance not only leads to measured resistance deviation, but also the measured reactance deviates from its actual value. This would lead to both under-reaching and over-reaching. This paper investigates the over-reaching aspect by defining an...
This paper discusses the maximum fault resistance, which can be tolerated by a communication aided distance relay with Mho characteristic. This is defined as the boundary fault resistance, that for lower fault resistances the relay can discriminate between in-zone and out-of-zone faults correctly. The robustness criterion is defined on the basis of the boundary fault resistance. In order to achieve...
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