Research and case analysis on open-circuit fault of delta winding on low-voltage side of transformer

Zhe Feng; Guozheng Li; Yin Zhang; Junhong Wu

doi:10.1117/12.2640520

19 October 2022 Research and case analysis on open-circuit fault of delta winding on low-voltage side of transformer

Zhe Feng, Guozheng Li, Yin Zhang, Junhong Wu

Proceedings Volume 12294, 7th International Symposium on Advances in Electrical, Electronics, and Computer Engineering; 122942N (2022) https://doi.org/10.1117/12.2640520
Event: 7th International Symposium on Advances in Electrical, Electronics and Computer Engineering (ISAEECE 2022), 2022, Xishuangbanna, China

Abstract

This paper introduces a case study of an isolated neutral point system in which the overheating and melting at the flexible connection on the low-voltage side of unit auxiliary transformer leads to multiple intermittent grounding and subharmonic resonance, and finally an open circuit of the delta winding on the low-voltage side causes voltage waveform distortion, to study and analyze the case in all its stages based on the results of fault recording, KCL current equation, and Matlab simulation. At the end of the paper, it is proposed that for the transformer delta winding, the DC resistance between the connecting lines should be tested from the outgoing line terminals to eliminate the blind spot of the phase-to-phase DC resistance test, and at the same time, through the research and analysis, it provides a reference for the rapid inspection and analysis of hidden problems and hidden defects of similar equipment.

Citation Download Citation

Zhe Feng, Guozheng Li, Yin Zhang, and Junhong Wu "Research and case analysis on open-circuit fault of delta winding on low-voltage side of transformer", Proc. SPIE 12294, 7th International Symposium on Advances in Electrical, Electronics, and Computer Engineering, 122942N (19 October 2022); https://doi.org/10.1117/12.2640520

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