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An algorithm for directional earth-fault relay with no voltage inputs

机译:无电压输入的定向接地故障继电器的算法

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摘要

In this paper an algorithm for directional earth-fault relay without voltage inputs is presented. This relay is intended for use in isolated neutral networks. For a reference quantity the algorithm does not use the zero sequence voltage, but phase currents since in isolated neutral system they vary only slightly when a phase-to-earth fault occurs. Instead of the phase angle between the zero-sequence voltage and current phasors, the integral of the product of the phase and zero-sequence current over one-half period of the signals is calculated. For this reason the algorithm has high speed of response. The algorithm detects not only the line containing a phase-to-earth fault but also the faulted phase.
机译:本文提出了一种无电压输入的定向接地故障继电保护算法。该继电器旨在用于隔离的中性网络。对于参考量,该算法不使用零序电压,而是使用相电流,因为在隔离的中性线系统中,当发生相接地故障时,它们只会略有变化。代替零序电压和电流相量之间的相角,而是计算信号一半周期内相位和零序电流乘积的积分。因此,该算法具有较高的响应速度。该算法不仅可以检测到包含相间故障的线路,还可以检测出有故障的相位。

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