A Detection Method for Slight Inter-Turn Short-Circuit Fault in Dry-Type Air-Core Shunt Reactors

Jie Wu, Wei Zhen, Zhengwei Chang, Man Zhang (), Yumin Peng, Ying Liu and Qi Huang
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Jie Wu: Electric Power Research Institute of State Grid Sichuan Electric Power Company, Chengdu 610041, China
Wei Zhen: Electric Power Research Institute of State Grid Sichuan Electric Power Company, Chengdu 610041, China
Zhengwei Chang: Electric Power Research Institute of State Grid Sichuan Electric Power Company, Chengdu 610041, China
Man Zhang: School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu 610059, China
Yumin Peng: School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu 610059, China
Ying Liu: School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu 610059, China
Qi Huang: School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu 610059, China

Energies, 2024, vol. 17, issue 7, 1-14

Abstract: Dry-type air-core shunt reactors are integral components in power transmission and distribution networks, designed to control reactive power and enhance system stability. However, inter-turn short-circuit faults (ISCFs) are common occurrences in shunt reactors, which are caused by various factors, including manufacturing defects, insulation degradation, or operational stresses. At the early stage of the ISCFs, the current does not reach a sufficient level to activate the protective equipment. These faults may lead to serious consequences, such as overheating, insulation breakdown, and even catastrophic failures, posing risks to the entire power system. Therefore, developing an effective and reliable detection method for ISCFs at the early stage is paramount. In this paper, a new method named the fault detection factor (FDF) based on equivalent resistance is presented to detect the slight ISCFs in dry-type air-core shunt reactors considering insulation resistance. In addition, the effect of noise signal existence in the monitoring process is taken into account. A moving average filter is adopted to guarantee both the sensitivity and the reliability of the proposed method. Ultimately, the simulation results of the FDF under different conditions are presented, which show the effectiveness and potential of the proposed method in observing and monitoring slight ISCFs.

Keywords: dry-type air-core shunt reactors; inter-turn short-circuit fault; equivalent resistance; high sensitivity (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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