The Research on Joint Condition Diagnosis of Arrester in Distribution Network based on Live-line Monitoring

Live-line Monitoring for Power Grid Equipment is to obtain the device status information directly with detection device and monitoring device under the situation of non-stopping power, so as to scientific judgment the equipment health. Compared with traditional patrol inspection and power failure test, live monitoring has significant advantages in detecting potential hidden dangers of equipment. Based on the analysis of the performance and common faults in the distribution network arresters, this paper proposes three joint state diagnosis methods based on live monitoring. In the actual case, the comprehensive test and analysis of AC leakage current under the operating voltage, infrared temperature measurement, on-line monitoring data and power failure test data of distribution network arrester are carried out. Test data show that the arrester has defects. After the disassembly of the arrester, there are some defects in the arrester indeed. It is further confirmed that joint the AC leakage current, infrared temperature measurement and online monitoring data under the operating voltage can timely find the internal insulation defects of the arrester.