Research on Testing Methods for Grounding Loop Resistance of High Voltage Cables

In this paper, a high voltage cable grounding circuit resistance test method is proposed by coupling injection of different frequency signals. Non-power frequency signals are injected into the metal sheath of cross-connected circuit under charged state, and the test voltage, current and voltage current phase difference are extracted. The physical model of cable cross-connected grounding is established, and the measuring device is developed and applied research is carried out. The high voltage cable grounding circuit resistance is accurately measured.