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| Iterative Extraction of Detected Zero-Mode Wave Velocity and Its Application in Single Phase-to-ground Fault Location in Distribution Networks |
| Tang Jinrui1, 2, Yin Xianggen1, 2, Zhang Zhe1, 2, Qi Xuanwei1, Lou Lingjiao1, Chen Kunyi1 |
| 1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China 2. Electric Power Security and High Efficiency Laboratory Huazhong University of Science and Technology Wuhan 430074 China |
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Abstract This paper presents an iterative algorithm to extract detected zero-mode wave velocity and a new method for single phase-to-ground fault location in distribution networks is given based on it. About the speed instability of zero-mode component, the paper discovers that the detected zero-mode wave velocity would be more stability by selecting appropriate large wavelet scale to detect the arrival time of traveling wave. Meanwhile, an iterative algorithm is designed based on the correspondence of the frequency component at the arrival time of traveling wave to fault distance and the correspondence of zero mode velocity to the frequency. It can improve the accuracy and anti-interference ability for detected zero-mode wave velocity extraction. Based on the iterative algorithm, the paper presents a new two terminal method of single phase-to-ground fault location based on the gap between zero mode and aerial mode traveling wave propagation time. This method does not need time synchronization, not only can locate the fault position at trunk lines, but it can also locate the fault position at braches. The effectiveness and practicability of the method are verified by the PSCAD/EMTDC simulation results.
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Received: 28 September 2011
Published: 25 March 2014
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2013, Vol. 28 
