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

doi:10.3969/j.issn.1008-0198.2026.04.007

Abstract

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

CLC Number:

TM773.4

SHE Changjia, SUN Zichang, CHEN Hao, CHEN Yuanxin, DU Xiao. Cause Analysis and Correction Strategies for Multiple Reporting of Fault Phases in Transformer Differential Protection[J]. Hunan Electric Power, 2026, 46(4): 41-46.

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