The grounding current increases and the outer sheath heats up seriously, which will greatly reduce the operating heat capacity of the cable and affect the stable operation of the cable. Therefore, detecting the grounding current of the cable accessory is of great significance for monitoring the operation of the cable. In order to improve the operational monitoring level, the ground loop online monitoring system began to be gradually applied in the power system. In this paper, based on the operating environment of XLPE high-voltage cable, the structure design of the on-line monitoring system of grounding circulation is analysed. The examples of online monitoring system are given. The advantages and disadvantages of the monitoring system are discussed in combination with the operating experience.
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