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首页> 外文期刊>Electric Power Components and Systems >An Improved Pilot Relaying Scheme for Shunt Compensated Transmission Line Protection Based on Superimposed Reactive Power Coefficients
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An Improved Pilot Relaying Scheme for Shunt Compensated Transmission Line Protection Based on Superimposed Reactive Power Coefficients

机译：一种基于叠加无功功率的改进型分路补偿传输线保护的继电保护方案

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摘要

The fault component power and energy based relaying schemes have limitation during double-phase to ground fault due to the mutual coupling effect. This article presents a superimposed reactive power coefficient (SRPC) based pilot relaying scheme for the protection of shunt compensated transmission line. SRPC of a phase is defined as the ratio of integrated superimposed reactive power (SRP) of that phase to the maximum magnitude of integrated SRPs among all three phases. If SRPC of any phase is found less than -0.5. an internal fault is detected and that phase is considered as a faulty phase. If no phase possesses SRPC less than -0.5, the fault is an external fault. The algorithm will start only if the superimposed differential current of any phase is found more than 50% of pre-fault differential current. The results are obtained using PSCAD/EMTDC software for different conditions, such as different fault resistances, fault locations, static VAR compensator locations, and source impedances. The proposed scheme is found robust and accurate for all the cases considered. The performance of the proposed scheme is superior to the recently proposed similar type of scheme and is unaffected from capacitive coupled voltage transformer and current transformer measurement errors and synchronization error.
机译：由于互耦效应，基于故障分量功率和能量的继电方案在双相接地故障期间具有局限性。本文提出了一种基于叠加无功功率系数（SRPC）的导频中继方案，用于保护并联补偿传输线。相的SRPC定义为该相的积分叠加无功功率（SRP）与所有三相中积分SRP的最大幅度之比。如果发现任何阶段的SRPC都小于-0.5。检测到内部故障，并且将该阶段视为故障阶段。如果没有相位的SRPC小于-0.5，则故障是外部故障。仅当发现任何相位的叠加差分电流超过故障前差分电流的50％时，算法才会启动。使用PSCAD / EMTDC软件可在不同条件下获得结果，例如不同的故障电阻，故障位置，静态VAR补偿器位置和源阻抗。发现所提出的方案对于所有考虑的情况都是鲁棒且准确的。所提出的方案的性能优于最近提出的类似类型的方案，并且不受电容耦合电压互感器和电流互感器测量误差以及同步误差的影响。

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