Partial discharge detection system of medium-voltage cable

The invention relates to a partial discharge detection system of a medium-voltage cable. The partial discharge detection system comprises an operating rod, a connecting assembly and a glass fiber rod.A horizontal through hole is formed in the operating rod and is detachably installed at one end of the connecting assembly; a contact head is arranged at one end of the glass fiber rod; a sensor is arranged on the connecting assembly; and a microprocessor is connected to the sensor. The system has the advantages that: since the contact head of the glass fiber rod is in contact with the insulationoutside of the cable terminal, the partial discharge state in the cable is transmitted into the sensor through the insulating layer via the glass fiber rod and the sensor transmits a received signalto the microprocessor for analysis and processing; the enough insulating strength can be ensured and the ultrasonic signals of ultrasonic waves can be transmitted by the glass fiber rod, so that the live detection of the distri