湖南电力 ›› 2026, Vol. 46 ›› Issue (4): 41-46.doi: 10.3969/j.issn.1008-0198.2026.04.007

• 电网运行与控制 • 上一篇    下一篇

变压器差动保护多报故障相别的原因分析与修正策略

佘昌佳, 孙子昌, 陈昊, 陈远新, 杜敩   

  1. 国网江苏省电力有限公司南京供电分公司,江苏 南京 210019
  • 收稿日期:2026-03-09 修回日期:2026-04-23 出版日期:2026-08-25 发布日期:2026-09-11
  • 作者简介:佘昌佳(1994),男,硕士,工程师,研究方向为电气设备运检和故障分析。
  • 基金资助:
    国网江苏省电力有限公司科技项目(J2024203)

Cause Analysis and Correction Strategies for Multiple Reporting of Fault Phases in Transformer Differential Protection

SHE Changjia, SUN Zichang, CHEN Hao, CHEN Yuanxin, DU Xiao   

  1. State Grid Nanjing Power Supply Company, Nanjing 210019, China
  • Received:2026-03-09 Revised:2026-04-23 Online:2026-08-25 Published:2026-09-11

摘要: 针对变电站主变压器差动保护动作后误判故障类型和多报故障相别的问题,首先分析降低主变压器差动回路不平衡电流的电流相位补偿原理,并结合该补偿算法分析主变压器保护出现多报故障相别的原因。其次,在算法层面提出一种基于电流变化故障选相辅助判据的策略,对保护装置选相结果进行修正,并通过实例验证了修正策略的有效性。最后,根据原因分析和修正策略,给出应对此问题的处置方法。故障处置方法提示卡已在多座500 kV变电站中应用,对变电站运维主变压器事故处置具有指导意义。

关键词: 变压器, 差动保护, 故障相别, 选相判据

Abstract: To address the issues of misjudging fault types and multiple reporting of fault phases after the differential protection of main transformers in substations, the current phase compensation principle for reducing unbalanced currents in the differential circuit of main transformers is first analyzed. Combined with this compensation algorithm, the causes of multiple reporting of fault phases in main transformer protection are examined. Subsequently, at the algorithmic level, a strategy based on current variation for fault phase selection as an auxiliary criterion is proposed to correct the phase selection results of the protection device, and the effectiveness of the correction strategy is verified through practical examples. Finally, based on the cause analysis and correction strategy, a solution to address this issue is provided. The fault handling method prompt card has been implemented in several 500 kV substations in Jiangsu, offering guidance for the operational and maintenance handling of main transformer accidents in substations.

Key words: transformer, differential protection, fault phase, phase selection criterion

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