摘要
阐述了雷电波侵入到变电站二次系统的途径。通过线路雷电波侵入到二次系统仿真模型的建立,得出:当线路遭受雷电流幅值为80kA的雷击时,经过变电站所用变压器耦合到二次系统上的电压最大为193.983285V,大大超过了二次设备的耐过电压水平,易造成二次设备的损坏。提出了变电站二次系统三级防护措施:低压电源系统的防雷;防止感应雷通过信号、控制线侵入;改善地电位分布。
Path of lightning surge invasion into secondary system of substation was described. By means of lightning surge invasion simulation it is obtained that at lightning strike current amplitude reaching 80 kA, the voltage amplitude of 193.983 285 V coupled to secondary system from the substation transformer itself, which is far beyond the withstand voltage level of installations of secondary system, leading to their failure. The triple protection measures for secondary system is proposed as follows： lightning protection of LV supply, prevention from inductive surge invasion through signal and control conductors and improvement of ground potential distribution.
出处
《电瓷避雷器》
CAS
2008年第4期33-35,38,共4页
Insulators and Surge Arresters
关键词
变电站二次系统
防雷措施
ATP
地电位
secondary system of substation
lightning protection measures
ATP
ground potential
