特高压直流输电接地极在线监测系统设计

Design of on-line monitoring system for UHVDC earth electrode

特高压直流输电换流站接地极的检测多采用人工现场检测,这种方式无法获得接地极的实时运行数据,且人工费用较高.为了满足特高压直流输电系统安全的需求,设计了一种特高压直流输电接地极在线监测系统,该系统采用3G无线通信技术,可远程在线监测接地极电流、观测井水位等重要运行数据及接地极现场视频数据,实现对接地极的故障诊断及寿命评估.系统数据精度高和远程传输快,具有很好的野外运行稳定性.

The detecting of ultra high voltage direct current （UHVDC） earth electrode frequently uses manual inspection. This method can＇t get the real-time operational data of the earth elec- trodes. Meanwhile, the labor cost is very high. In order to meet the security needs of UHVDC, this paper designs an on-line monitoring system for UHVDC earth electrode. By 3G wireless com- munication-technologies, the system can monitor remotely many kinds of data such as the value of the grounding current, water level of the observation well, the video data around the earth e- lectrode site, etc. Through analyzing the data, the system has broad prospect on fault detection and life evaluation of the UHVDC earth electrode. The system has high data precision, fast trans- mission speed and good field operation stability.