变电站二次系统防雷措施的探讨

Discussion of Lightning Protective Measures of Transformer Substation Secondary System

变电站二次系统是电力系统的重要组成部分,但其耐雷水平低,雷电波侵入易导致二次设备的损坏,严重影响了电力系统的正常运行。分析了变电所二次系统防雷保护中存在的问题,探讨了雷电对微机保护、综合自动化系统的干扰方式和途径以及雷电流对二次系统的耦合方式,深入研究了二次系统防雷上存在的缺陷和不足,对二次系统防止雷电干扰提出改进措施:改变二次系统的接地方式,改善接地网电位分布,完善二次系统的屏蔽及安装电涌保护器等,提高了电力系统供电的可靠性。

Secondary system of the substation is an but because of its low level of lightning-resistant level, important part of the electnc power system, lightning surge can invade easily leading to damage of secondary equipments, and seriously affectes the normal operation of the power system. Existing problems of the lightning protection of substation＇s secondary system is analyzed, paths and means of lightning interfere to the microprocessor-based protection and integrated automation system, as well as coupling mode of lighting current on the secondary system is approached. The shortcomings and defects of the secondary system lightning protection is studied deeply, improvement measures for the secondary system to prevent lightning interference is proposed： changing the grounding means of the secondary system, improving the potential distribution of the grounding grid, consummating the shielding of the secondary system and installation of surge protectors and so on, the reliability of the power system electricity supply has been improved.