电压互感器N600接地电流在线监测装置研究

Research on on-line Monitoring Device for N600 Grounding Current of Voltage Transformer

电压互感器的公共回路(N600接地线)对保障系统安全运行具有非常重要的作用,国家电网公司和南方电网公司相关规程均规定,于此,文章研究了N600接地线必须可靠接地,且要求一点接地,但是变电站常由于人为接线错误或者绝缘老化等原因,出现了多点接地的情况。本项目实现了N600接地线多点接地监测报警,旨在提高N600线多点接地故障检测的准确性,实时性。

The common circuit of voltage transformer(N600 grounding wire)plays a very important role in ensuring the safe operation of the system.The relevant regulations of State Grid Corporation of China and China Southern Power Grid Corporation stipulate that N600 grounding wire must be reliably grounded,and requires a point of grounding.However,the substation often has multi-point grounding due to human wiring errors or insulation aging and other reasons.This project realizes the multi-point grounding monitoring and alarm of N600 grounding wire,and has the function of over limit alarm and mutation alarm.The accuracy and real-time performance of multi-point grounding fault detection of N600 line are greatly improved by replacing the manual detection method in the past.