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首页> 外文期刊>Electric power systems research >Wavelet based transformer protection using high frequency power directional signals
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Wavelet based transformer protection using high frequency power directional signals

机译：使用高频功率方向信号的基于小波的变压器保护

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摘要

This paper proposes a novel wavelet transform based relaying scheme for power transformer protection. The relay logic consists of two parts: disturbance detection based on first level high frequency details of the voltage signals only and fault discrimination using a power based directional signal derived from the first level high frequency details of both voltage and current signals. The logic is deterministic, computationally efficient, fast, secure and highly reliable. The operating time is 6 ms, about 1/3rd of power frequency cycle (20 ms). The scheme uses only the sign of the directional signals, rather than the difference in their magnitudes, hence it can work reliably in the presence of transformer tap variation, fault resistance and CT saturation. The validity of the proposed logic was exhaustively tested by simulating various types of internal and external faults, energization conditions and load variations on a 132kV system modeled in ATP/EMTP with a 31.5 MVA, 132/33 kV, Y-△ transformer. The proposed logic was able to correctly discriminate between internal faults, external faults and non-fault disturbances for all the 880 test cases.
机译：提出了一种基于小波变换的电力变压器保护继电保护方案。继电器逻辑包括两个部分：仅基于电压信号的第一级高频细节的干扰检测，以及使用基于功率的方向信号的故障判别，该方向信号从电压和电流信号的第一级高频细节得出。逻辑是确定性的，计算有效的，快速的，安全的和高度可靠的。工作时间为6 ms，约为工频周期（20 ms）的1/3。该方案仅使用方向信号的符号，而不使用其大小的差异，因此在存在变压器抽头变化，故障电阻和CT饱和的情况下，它可以可靠地工作。通过在ATP / EMTP模型中使用31.5 MVA，132/33 kV，Y-△变压器建模的132kV系统上，模拟各种内部和外部故障，通电条件和负载变化，对所提出逻辑的有效性进行了详尽的测试。所提出的逻辑能够正确地区分所有880个测试用例的内部故障，外部故障和非故障干扰。

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