中国电力 ›› 2014, Vol. 47 ›› Issue (6): 22-25.DOI: 10.11930/j.issn.1004-9649.2014.6.22.3

• 电网 • 上一篇    下一篇

直流输电中换流变压器零序过流保护的探讨

刘家军, 罗明亮, 徐玉洁   

  1. 许继电气股份有限公司,河南 许昌 461000
  • 修回日期:2014-03-21 出版日期:2014-06-18 发布日期:2015-12-08
  • 作者简介:刘家军(1987—),男,安徽滁州人,助理工程师,从事电力系统继电保护装置的研究和开发。E-mail: liu13584042233@126.com

Investigation on Converter Transformer’s Zero-Sequence Over-Current in HVDC System

LIU Jia-jun, LUO Ming-liang, XU Yu-jie   

  1. XJ Electric Limited Corporation, Xuchang 461000, China
  • Revised:2014-03-21 Online:2014-06-18 Published:2015-12-08

摘要: 针对银川极1换流变压器在空充时Y0/Y换流变零序过流误动导致开关跳闸这一事故展开思考,通过理论分析发现,换流变压器网侧发生接地故障时,流经Y0/Y换流变压器中性点和Y0/Δ换流变压器中性点零序电流的大小有很大差异。同时,建立仿真模型并以南方电网在许继集团的换流变保护装置RTDS试验中数据和波形为佐证。综合分析后得出:对于Y0/Y换流变压器而言,其零序过流保护没有投入的必要。

关键词: 高压直流输电, 换流变压器, 零序过流保护, 接地故障, 零序电抗, RTDS

Abstract: An investigation is made on the accident of switch trip in Yinchuan Pole 1 converter transformer caused by zero-sequence over-current malfunction of Y0/Y converter transformer during charging period. It was found that a big difference exists between the zero-sequence current that goes through the Y0/Y converter transformer neutral point and the one that goes through the Y0/Δ converter transformer neutral point when the line-side earth fault occurs. A model simulation is made based on the data and wave shape of XJ GROUP’s converter transformer protective device-RTDS used in CSG’s project. It is concluded through synthetic analysis that the zero-sequence over-current protection is not necessary for Y0/Y converter transformer.

Key words: HVDC, converter transformer, zero-sequence over-current protection, earth fault, zero-sequence resistance, RTDS

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