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| Study of Feeders Online Insulation Monitoring in Distribution Power Network |
| Liang Rui, Zhao Guodong, Wang Chonglin, Zhang Dongliang |
| China University of Mining and Technology Xuzhou 221116 China |
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Abstract After analyzing the status of line insulation condition monitoring in domestic and oversea power distribution network in detail, the problems that cable insulation parameters measurement error is relatively large, measured signal is weakness and vulnerable to external electromagnetic interference are revealed. The paper propose a method of recording the scene data of single-line- ground(SLG) fault or performing experiments of SLG artificially to measure the parameters of cable insulation. It not only do not need to increase the injected signal devices, but also can measure parameters slight change significantly. By adopting the method of modulation technology, the fundamental frequency signal is extracted. And combining Chebyshev Low-Pass Filter with narrow transition region, the aperiodic component and harmonic components of fault signal is effectively suppressed without estimating the noise parameters. Therefore, it is able to calculate the every feeder-ground insulation parameters accurately. Experiments show that the proposed method is immune to fault resistance, fault initial phase angle and fault distance, and it can be applied to different grounding methods of distribution power network.
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Received: 23 October 2013
Published: 22 May 2014
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2013, Vol. 28 
