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| Study on the small-current grounding fault location based on the kurtosis analysis of spectrum sequence |
| DOI：10.7667/PSPC171501 |
| Key Words:distribution network single-phase earth fault fault section location spectral analysis kurtosis |
| Author Name | Affiliation | | XU Chongchong | State Grid Beijing Electric Power Corporation, Beijing 100045, China | | LUO Xunhua | Zhuhai XJ Electric Co., Ltd., Zhuhai 519070, China | | ZHANG Wei | Zhuhai XJ Electric Co., Ltd., Zhuhai 519070, China | | LIN Tao | State Grid Beijing Electric Power Corporation, Beijing 100045, China | | CHI Zhongjun | State Grid Beijing Electric Power Corporation, Beijing 100045, China | | CHEN Yanxia | State Grid Beijing Electric Power Corporation, Beijing 100045, China | | TAN Weibin | Zhuhai XJ Electric Co., Ltd., Zhuhai 519070, China |
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| Abstract:In order to avoidthedifficulty of selecting gravity frequency on the downstream of fault point when transient center frequency method is used for fault location in distribution network, this paper puts forward that the Fourier spectrum sequence of zero sequence current component should be analyzed further using kurtosis analysis. For the upstream section of fault point, the amplitude of zero sequence current transient gravity center frequency is much higher than the other resonance frequency components, and the spectrum diagram is approximate to a single shock shape, thus the calculated kurtosis value is larger. For the downstream section of the fault point, the zero sequence current dispersion is distributed in each resonant frequency components, and its spectrum analysis graph is similar to multi-shock shape, thus the calculated kurtosis value is small. Therefore, the maximum difference of the kurtosis value of adjacent monitoring points is used to determine the fault section. A large number of ATP/EMTP simulations show that the proposed method can effectively find fault segments when the gravity frequency in the downstream of the fault point is not obvious, which can be used as a supplement to the transient center of gravity frequency criterion. This work is supported by Science and Technology Project of Headquarter of State Grid Corporation of China (No. 52020116000F). |
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