华电技术 ›› 2019, Vol. 41 ›› Issue (6): 23-26.

• 研究与开发 • 上一篇    下一篇

一起220kV主变压器保护装置发TV异常告警的原因分析

  

  1. 1.湖北科技学院〓a.电子与信息工程学院;b.工程技术研究院,湖北咸宁〓437000; 2.国网常德供电公司,湖南常德〓415000
  • 出版日期:2019-06-25 发布日期:2019-07-12

Analysis of an abnormal alarm of TV for a 220kV main transformer protection

  1. 1.a.School of Electrical and Information Engineering; b.Institute of Engineering Technology, Hubei University of Science and Technology, Xianning 437000, China; 3.State Grid Changde Power Supply Company, Changde 415000, China
  • Online:2019-06-25 Published:2019-07-12

摘要:

以一起220kV主变压器保护装置发电压互感器(TV)异常告警为例,说明三次谐波超标是引起装置TV异常的原因之一。经过进一步分析得出,当TV中性点装有消谐器时,消谐器会产生电压并在TV零序开口三角上显现出三次谐波,进而引起主变压器保护装置发TV异常告警。针对该类异常告警提出了解决对策,以确保变电站内主设备安全稳定运行。

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Abstract:

Taking an abnormal alarm of TV for a 220kV main transformer protection as an example, it is found that excessive third harmonic is a cause for abnomal TV.Furthermore,when a harmonic elimination is equipped at the TV neutral point, it can produce voltage and third harmonics in the zero sequence opendelta connection, causing abnormal alarm of TV for  main transformer protection.Corresponding methods are put forward to ensure the safe and stable operation of the main equipment of substation.

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