• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>IET International Conference on Developments in Power System Protection >Power frequency zero-sequence directional element for parallel transmission lines
【24h】

Power frequency zero-sequence directional element for parallel transmission lines

机译：用于并行传输线的功率频率零序方向元件

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The zero-sequence mutual inductance between parallel transmission lines can weaken the reliability of protective relay. As a novel zero-sequence directional element is proposed based on the model recognition theory, an inductance model is established for the internal fault. The model error is small for an internal fault while large and oscillating for an external fault. To solve the problem on the reliability and the sensitivity of the proposed method, caused by harmonics in the transient waveform, power frequency component is extracted by Fourier algorithm, least squares algorithm and fast phasor extracting algorithm separately in this paper. A 500kV parallel transmission-line model with zero-sequence mutual inductance is established in EMTP to verify performance of the proposed protective relay based on these algorithms. Each algorithm is studied by different data windows (5ms, 10ms and 20ms). Simulation result verifies the fast phasor extracting algorithm can accurately extract the power frequency component even with a short data window. And the proposed protective relay based on the fast phasor extracting algorithm has the best performance.
机译：并联传输线之间的零序互感可以削弱保护继电器的可靠性。基于模型识别理论提出了一种新型零序定向元件，为内部故障建立电感模型。内部故障的模型误差很小，而外部故障大而振荡。为了解决所提出的方法的可靠性和灵敏度的问题，由瞬态波形中的谐波引起的，通过傅立叶算法，最小二乘算法和快速量程提取算法提取功率分量。在EMTP中建立了具有零序相互电感的500kV并联传输线模型，以验证基于这些算法的提出的保护继电器的性能。通过不同的数据窗口（5ms，10ms和20ms）研究了每种算法。仿真结果验证了快速量相提取算法即使使用短数据窗口也可以精确提取功率分量。并且基于快速量量提取算法的提出的保护继电器具有最佳性能。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号