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首页> 外文期刊>American journal of applied sciences >The Effect of the Harmonics, the Fault Location and the Fault Resistance on the Performance of the Impedance-Type Distance Relay | Science Publications
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The Effect of the Harmonics, the Fault Location and the Fault Resistance on the Performance of the Impedance-Type Distance Relay | Science Publications

机译：谐波，故障位置和故障电阻对阻抗型距离继电器性能的影响科学出版物

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> One of today's trends is continuously increasing the number and the power ratings of the non-linear loads connected to the electric power systems. These non-linear loads, such as power-electronic converters, are the main source of the harmonics that affect the performance of the impedance-type distance relays. It was found that, in the presence of harmonics, undesired operation of such type of distance protection will occur, as the distance relay can react improperly and sense faults at zones other than the desired ones and the selectivity of the distance relays will be violated as improper relays will react while those concerned will not. It has been also shown that the fault location and the fault resistance were affecting the impedance seen by the distance relay. The data obtained from the analysis of a three-phase-to-ground fault, in a sample four-bus practical system, was used to study the behavior of the distance relay and to estimate the impedance seen by it. An algorithm, that can be used to calculate the system quantities in the presence of a harmonic source, was suggested.
机译： >当今的趋势之一是不断增加连接到电力系统的非线性负载的数量和额定功率。这些非线性负载（例如电力电子转换器）是影响阻抗型距离继电器性能的谐波的主要来源。已经发现，在存在谐波的情况下，由于距离继电器会做出不正确的反应并感应到除所需区域以外的区域的故障，并且距离继电器的选择性会受到破坏，因此会发生这种类型的距离保护的意外操作。不正确的继电器会做出反应，而有关人员则不会。还显示出故障位置和故障电阻会影响距离继电器的阻抗。在样例四母线实际系统中，从三相接地故障的分析中获得的数据用于研究距离继电器的性能并估算其所看到的阻抗。提出了一种算法，该算法可用于在存在谐波源的情况下计算系统数量。

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