Partial discharge detection system of medium-voltage cable

Abstract

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 distribution network cable terminal is realized; the partial discharge amount of the medium-voltage cable terminal can be accurately tested and the normal operation of a line is not affected; and the reliable quality assurance is obtained in the debugging and acceptance process.

Description

technical field [0001] The invention relates to a medium-voltage cable partial discharge detection system. Background technique [0002] With the acceleration of power grid construction, especially the increase in investment in cable construction, distribution network accidents caused by cable faults have occurred frequently. Among them, partial discharge is one of the main reasons for cable damage. Due to the complex insulation structure of the cable terminal, there are many reasons that affect its insulation performance. In addition, the failure rate is much higher than that of the cable body due to poor manufacturing process on site. Therefore, the partial discharge detection of the cable terminal is the focus of the cable status detection. [0003] At present, medium-voltage cable partial discharge detection is often carried out indirectly through the detection of switch cabinets. The main problems are: 1. There are many sources of external strong electromagnetic field ...

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Problems solved by technology

[0003] At present, medium-voltage cable partial discharge detection is often carried out indirectly through the detection of switch cabinets. The main problems are: 1. There are many sources of external strong electromagnetic field interference; 2. The detected cable partial discharge signal is very weak, and it is impossible to accurately judge the cable partial discharge 3. The partial discharge detection of cables has not been fully carried out, and there is a gap

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