Abstract

Due to asymmetrical arrangement of multi-loop high-voltage cables and unequal distance of each section in cross-connection grounding, the induced voltage cannot be completely balanced, resulting in grounding current. When the grounding current is too large, it will affect the cable current-carrying capacity, increase the line loss and have a great influence on the cable, so the cable grounding current distribution is of great significance to the design and operation of the cable. In order to analyze the ground current distribution of multi-loop high-voltage cable, the induced voltage distribution and leakage current distribution of single-phase cable are analyzed through simulation and experiment, and the induced voltage and leakage current distribution model of single-phase cable is obtained. Secondly, the single-loop three-phase cross-interconnection system is built and the sheath grounding current is analyzed in the actual cable system. Finally, the grounding current distribution model of multi-loop cable system is obtained by simulating multi-loop three-phase cross-interconnection system.

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