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| Inter-Turn Short-Circuit Detection of Dry-Type Air-Core Reactor Based on Spatial Magnetic Field Distribution |
| Song Han1, Zou Liang1, Zhang Xiuqun2, Zhang Li1, Zhao Tong1 |
1. School of Electric Engineering Shandong University Jinan 250061 China;
2. Jinan Licheng Power Supply Company State Grid Shandong Electric Power Company Jinan 250100 China |
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Abstract A detection method of inter-turn short-circuit based on the distribution of spatial magnetic field of dry-type air-core reactors (DAR) was proposed considering the influence of DAR inter-turn short-circuit fault on safe and stable operation of substation equipment. The fault positions were set as the "upper", "middle" and "lower", and the fault degree were set as "mild", "moderate" and "severe". The correlation between the fault and the spatial magnetic field distribution of DAR was acquired after analyzing the spatial magnetic field distribution of DAR along two different directions which are the axial traverse in center (ATC) and the lateral traverse in center (LTC). The detection functions were obtained from curve fitting of the magnetic induction changes with the fault position h and the fault degree s, respectively. Then, the detection functions were verified by two different examples. The results show that, the absolute error of the function is less than 0.3, and the relative error is less than 1.5%. The fault position and degree can be detected accurately by the detection functions, which proves the validity of the inter-turn short-circuit detection method based on the spatial magnetic field distribution of DAR.
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Received: 08 April 2018
Published: 29 July 2019
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2019, Vol. 34 
