NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–CCTV Monitor Tester
Partial discharge What is partial discharge? Partial discharge Recently, the staff of our company conducted a 220KV start-up transformer cable AC withstand voltage and partial discharge experiment in a power plant in Shenzhen. The test lasted for 2 days, and the partial discharge test was carried out by the partial discharge measuring instrument independently sold by our company. So what exactly is partial discharge? When the applied voltage is only localized in the electrical equipment insulator, and does not penetrate between the conductors where the voltage is applied, it can occur near the conductors or in other places. This phenomenon is called partial discharge (PD).
Partial discharges Partial discharges can occur inside insulators, at the interface between insulators and conductors, and on the surface of insulators. When the conductor is surrounded by gas, the PD at the edge of the conductor is also called corona. Discharge that occurs locally in the insulation of electrical equipment under the action of a sufficiently strong electric field.
This discharge is limited to only causing a partial short (bridge) of the insulation between the conductors without forming a conductive path. Each partial discharge will have some impact on the insulating medium. A slight partial discharge has a small impact on the insulation of power equipment, and the insulation strength decreases slowly; while a strong partial discharge will quickly reduce the insulation strength. This is an important factor in damaging the insulation of high-voltage power equipment.
Therefore, when designing the insulation of high-voltage power equipment, it should be considered that under the action of long-term working voltage, relatively strong partial discharge is not allowed to occur in the insulation structure. The equipment in operation should be monitored. When the partial discharge exceeds a certain level, the equipment should be taken out of operation and repaired or replaced. Partial discharge Shenzhen Noyafa Electronic Technology Co., Ltd. is a high-tech enterprise engaged in scientific research, production and sales, and provides technical services for cable fault detection.
At present, a variety of high-voltage test equipment and testing instruments have been widely used in the industry. At the same time, our company provides technical services such as cable fault detection and substation testing and testing to users across the country. The core engineer responsible for providing technical services has 20 years of on-site testing. Experience, can provide solutions according to different types of cables and site environment. What is partial discharge? Partial discharge Shenzhen Noyafa Electronic Technology Co., Ltd.
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