基于双层阻抗模型的三相单芯电缆自恢复故障定位

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Abstract The failure process of the underground cable also accompanies the periodical self-clearing faults.Fast and accurate location of this kind of fault can find the potential fault points before a permanent breakdown,which provides the basis for operation and maintenance of underground cables.An algorithm for locating the self-clearing fault based the double impedance model in the three phase single core cables has been proposed that considers the impact of the metal sheath.The circuit equations of the core-sheath-ground self-clearing fault and the core-sheath self-clearing fault have been derived based on the double impedance model.The proposed method uses the time-domain information of the current and voltage waveforms monitored in the head-end of cables.The self-clearing fault can be located by the least squares regress method during a short time.Extensive simulations show that the algorithm,considering the behavior of the metal sheath of cables,can locate the self-clearing fault accurately.The proposed method is more consistent with actual structure of cables than the methods only consider the impedance of the core and it can explain the electrical behavior between the conduction and metal sheath of coaxial cables.

Key words： Single-core cable metal sheath self-clearing fault double impedance fault location

Received: 26 May 2015 Published: 18 September 2016

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