关键词: 绝缘子污闪, 泄漏电流监测, 正交锁相放大, 预警信息, ＴＬｉｎｋ

Abstract:  Pollution flashover accident has a large impact area and a long power outage. Aiming at the problems of low efficiency and high cost of traditional insulator flashover screening, an insulator leakage current online monitoring device is designed. The device can effectively extract the detected current signal from the noise through orthogonal phase-locked amplification technology, which solves the problem that it is difficult to get accurate information due to weak signal and serious interference during insulator leakage current monitoring. The device takes STM32 as the control core, and realizes the accurate monitoring of insulator leakage current through orthogonal phase-locked amplification technology. The monitoring information is uploaded to TLink cloud platform in real time through GPRS wireless communication, and the remote online view of data is realized. By comparing the data with the threshold, alarm information can be sent to the user when the leakage current value exceeds the threshold. The test results show that the measurement accuracy of the device can reach ±5% within the monitoring range of 0～30 mA, and can send alarm information in time, as well as record, store and query historical data.