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Percentage Differential Protection of Double-circuit Line Using Wavelet Transform

机译：小波变换的双回线差动保护百分比

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This article presents development of a new percentage differential protection scheme for double-circuit transmission line using wavelet transform (WT). The work presented addresses the problems encountered by conventional distance relays when protecting double-circuit transmission lines sharing the same right of way. By the use of powerful analyzing and decomposing features of WT, a new technique is presented that takes care of the problems faced by pilot independent distance relay. The suggested technique depends on the six line currents of the two parallel lines at each end. The idea of the protection algorithm is based on the percentage of the difference of the two line current of each corresponding phase at each terminal. The measured six line currents at the relay location are decomposed into three levels of decomposition using the db4 mother wavelet. The summation of third level approximation coefficients are used as bias current whereas third level detailed coefficients are used as differential current. The proposed method eliminates many of the problems associated with double-circuit lines, such as high fault resistance, cross-country fault, mutual coupling effects, remote infeed, and avoids the problem of single-end supply. The stability of the relay under varied system configurations and operating conditions is examined. The relay algorithm is tested for various probable fault inception angles and loading conditions and with varying fault resistance between 0-150 ohms. The proposed wavelet based scheme provides encouraging results for different fault and system conditions. Relaying signals under different fault conditions were obtained by simulating the system using PSCAD/EMTDC.
机译：本文介绍了一种使用小波变换（WT）的双回路输电线路新型百分比差动保护方案的开发。提出的工作解决了传统距离继电器在保护具有相同通行权的双回路传输线时遇到的问题。通过使用强大的WT分析和分解功能，提出了一种新技术，该技术可以解决飞行员独立距离中继所面临的问题。建议的技术取决于两端的两条平行线的六线电流。保护算法的思想是基于每个端子上每个相应相的两线电流之差的百分比。使用db4母小波将在继电器位置处测得的六线电流分解为三个分解级别。第三级近似系数的总和用作偏置电流，而第三级详细系数用作差分电流。所提出的方法消除了与双回线相关的许多问题，例如高故障电阻，越野故障，互耦效应，远程馈电，并且避免了单端供电的问题。检查了继电器在各种系统配置和运行条件下的稳定性。测试了该继电器算法的各种可能故障起始角度和负载条件，并且故障电阻在0-150欧姆之间变化。所提出的基于小波的方案为不同的故障和系统条件提供了令人鼓舞的结果。通过使用PSCAD / EMTDC对系统进行仿真，可以获得不同故障条件下的继电器信号。

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