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首页> 外文会议>2015 5th International Conference on Electric Utility Deregulation and Restructuring and Power Technologies >Maloperation prevention study of zero sequence direction protection to broken-line faults of parallel circuits on same tower
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Maloperation prevention study of zero sequence direction protection to broken-line faults of parallel circuits on same tower

机译：零序方向保护对同塔并联电路断线故障的误操作预防研究

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摘要

A maloperation prevention method of zero sequence direction longitudinal protection was presented in this paper directing at broken-line faults of double-circuit transmission lines on a same tower. Firstly, the maloperation reasons were analyzed in detail. Then, the zero sequence direction amplitude-comparison criterion and the negative sequence direction amplitude-comparison criterion were constructed. The zero sequence criterion is used to detect earth faults sensitively and the negative sequence criterion is used to avoid maloperation of zero sequence criterion resulting from electrical and magnetic coupling during broken-line period. Meanwhile, the zero sequence current threshold and negative sequence current and voltage threshold were set for insuring the reliability of the whole protection scheme. The interior fault logic is that the zero sequence direction criterions of the two sides of lines both reveal forward direction. If that occurs, the zero sequence longitudinal protection acts and the fault line is removed. Otherwise, the protection will not act. Finally, the simulation results demonstrated the availability of the presented protection method.
机译：针对同一塔架双回线断线故障，提出了一种零序方向纵向保护的误动预防方法。首先，详细分析了误操作的原因。然后，建立了零序方向幅度比较准则和负序方向幅度比较准则。零序准则用于灵敏地检测接地故障，负序准则用于避免在断线期间电气和磁耦合导致的零序准则误操作。同时设置零序电流阈值和负序电流电压阈值，以确保整个保护方案的可靠性。内部故障逻辑是线路两侧的零序方向准则均显示正向。如果发生这种情况，则将执行零序纵向保护，并移除故障线。否则，保护措施将失效。最后，仿真结果证明了所提出的保护方法的有效性。

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