Localization and Diagnosis of Short-Circuit Faults in Transformer Windings Injected by Damped Oscillatory Wave

Chengbo Hu, Xueqiong Zhu (), Yongling Lu, Ziquan Liu, Zhen Wang, Zhengyu Liu and Kangyong Yin
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Chengbo Hu: State Grid Jiangsu Electric Power Company Ltd., Research Institute, Nanjing 211103, China
Xueqiong Zhu: State Grid Jiangsu Electric Power Company Ltd., Research Institute, Nanjing 211103, China
Yongling Lu: State Grid Jiangsu Electric Power Company Ltd., Research Institute, Nanjing 211103, China
Ziquan Liu: State Grid Jiangsu Electric Power Company Ltd., Research Institute, Nanjing 211103, China
Zhen Wang: State Grid Jiangsu Electric Power Company Ltd., Research Institute, Nanjing 211103, China
Zhengyu Liu: State Grid Jiangsu Electric Power Company Ltd., Research Institute, Nanjing 211103, China
Kangyong Yin: State Grid Jiangsu Electric Power Company Ltd., Research Institute, Nanjing 211103, China

Energies, 2024, vol. 17, issue 24, 1-13

Abstract: Power transformers, as critical components in regional power distribution and transmission systems, require early fault detection to ensure system reliability. This paper presents a scalable design capable of rapidly simulating winding faults in experimental transformers. By diagnosing three-phase transformer winding short-circuit faults using oscillatory shock voltages and numerical statistical methods, the relationship between the transfer function and winding short-circuit faults is investigated. The experimental results show that winding short-circuit faults cause significant changes in the transfer function curve. By analyzing transfer function variations across different phases, the location of a fault can be effectively determined. Furthermore, the correlation coefficient and absolute logarithmic deviation provide a clear indication of the fault severity. The transfer function of the high-voltage phase-to-phase is particularly sensitive to winding short-circuit faults. In non-fault phases, after the application of damped oscillatory waves, the transfer function correlation coefficient becomes negative and the absolute logarithmic deviation increases linearly with fault severity. These findings provide a rapid diagnostic solution for determining both the faulty phase and the severity of damage in three-phase transformer winding short-circuit faults.

Keywords: three-phase transformer; winding faults; damped oscillatory wave; transfer function; statistical methods (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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