Cable partial discharge refers to the partial discharge phenomenon of cable insulators, which usually occurs at the defects of cable insulation materials. The main reasons for the phenomenon of partial discharge of the cable are the defects of the insulation material of the cable itself, the unqualified quality of cable installation, and the aging of the cable. Partial discharge of cable has great harm, not only the damage of the cable itself, but also will have a certain impact on the power system, which is a potential safety hazard in the operation of the power system.
Partial discharge will lead to thermal decomposition, oxidation and breakdown of cable insulation materials, thereby reducing the insulation performance of the cable, and even leading to accidents such as cable short circuit and fire; Partial discharge of cables will cause voltage and current distortion in the power system, increase energy loss, reduce the efficiency of the power system, and even lead to the collapse of the entire power system; Due to the partial discharge of the cable, it will produce high temperature, high voltage and other risk factors, which may cause serious accidents such as fire and high voltage, which will pose a threat to people's life safety.
Partial discharge of cables cannot be avoided, so it is necessary to take measures to prevent them. In addition to strengthening the maintenance and management of cables, regularly inspecting and maintaining cables, through the application of advanced technical means such as partial discharge monitoring technology, the status of cables in operation can be monitored, and cable partial discharge problems can be found and dealt with in a timely manner to avoid damage to cables and power systems.
Shaanxi public design and development of high-voltage cable partial discharge monitoring system, is a system that can carry out long-term monitoring of key stations and equipment of the power system, abnormal equipment, etc. The system adopts a clamp-type sensor (high-frequency pulse current sensor) that can be disassembled and installed without power failure to couple the partial discharge pulse current signal in the cable body, and at the same time, comprehensive anti-interference measures such as analog filtering and frequency characteristic analysis are used to ensure the true reliability of the partial discharge test data.
This article was written by Shaanxi Public Intelligent Technology Co., Ltd. Shaanxi Public Electric Co., Ltd.