High-voltage cable sheath circulating current on-line monitoring and fault interval judging device

The utility model discloses a high-voltage cable sheath circulating current online monitoring and fault section judging device in the technical field of grounding circulating current signal acquisition and processing, which comprises a monitoring host and a circulating current sensing unit, the monitoring host comprises a host shell, one end of the host shell is provided with a first power supply aviation plug female head, and the other end of the host shell is provided with a second power supply aviation plug female head; an acquisition unit aviation plug female head, a POE power supply female head and an indicating lamp are arranged on the side surface of the host shell; the circulating current sensing unit comprises a unit shell, a second power supply aviation plug female head capable of being connected with the first power supply aviation plug female head is arranged on the unit shell, a double-magnetic-core current sensor and an automatic core alignment device are arranged in the unit shell, and the unit