A Fault Diagnosis Method for Interturn Short Circuit of Dry-Type Air-Core Reactor Based on High Frequency Impedance Spectrum

doi:10.11930/j.issn.1004-9649.202309025

Abstract

Abstract:

A detection method for interturn short circuit fault in dry-type air-core reactor is proposed using broadband impedance spectroscopy. Firstly, an equivalent distributed circuit model of intact reactor under high frequency is constructed based on the theory of multi-conductor transmission lines, and an equivalent simulation model is established based on the parameter calculation equation of the distributed equivalent circuit to analyze the high-frequency characteristics of the reactor broadband impedance spectrum. Secondly, the amplitude spectrum and phase spectrum of the broadband impedance of the reactor with interturn short circuit fault are simulated to analyze the influence of inductance parameters on the resonant frequency of the reactor impedance spectrum. Finally, an experimental testing was conducted on a small dry-type air-core reactor in the laboratory, which has verified the effectiveness of the proposed method.

Key words: dry-type air-core reactor, impedance spectrum, interturn short circuit, fault diagnosis, high frequency characteristics

Heqian LIU, Jian ZHANG, Haiyue ZHANG, Hongda YANG, Shiyu CHEN, Yubo SHEN, Lei WANG. A Fault Diagnosis Method for Interturn Short Circuit of Dry-Type Air-Core Reactor Based on High Frequency Impedance Spectrum[J]. Electric Power, 2024, 57(10): 218-224.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202309025

https://www.electricpower.com.cn/EN/Y2024/V57/I10/218

Figures/Tables 11

Fig.1 Equivalent circuit of intact reactor

Fig.2 Equivalent circuit of reactor with interturn short circuit fault

Fig.3 Equivalent circuit of interturn short circuit

Fig.4 Node circuit

Fig.5 Node circuit

Fig.6 Simulation circuit of intact reactor

Fig.7 The impedance spectrum of reactor with interturn short circuit at the head end

Fig.8 The impedance spectrum of reactor with interturn short circuit in the middle

Fig.9 The impedance spectrum of the reactor with interturn short circuit at the end

Fig.10 Curves of characteristic parameters varying with fault degree and fault location

Fig.11 The tested impedance spectrum of interturn short circuit fault

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