应用灭弧防雷间隙抑制弧光过电压的方法  

Approach to Inhibit Arc Grounding Over-voltage by Air-blast Interruption Gap

作　　者：陈光会[1] 刘儒[2] 蒙世国[3] 王巨丰[2] 黄维[2] 曲振旭[2] 

机构地区：[1]广西水利电力职业技术学院,南宁530004 [2]广西大学电气工程学院．南宁530004 [3]广西电网公司钦州供电局,钦州535000

出　　处：《高压电器》2012年第5期26-32,共7页High Voltage Apparatus

基　　金：国家自然科学基金项目(50867002)~~

摘　　要：当绝缘子发生雷击闪络造成单相接地故障时,间歇性电弧容易引发弧光接地过电压,对电网绝缘薄弱处造成破坏,影响电网安全运行。针对上述情况,设计了一种基于"疏导型"防雷理念和"气吹灭弧"相结合的灭弧防雷间隙。该间隙在快速疏导雷电流入地的同时,启动高速灭弧装置,熄灭故障点工频续流,抑制间歇性电弧产生和过电压。笔者通过对小电流灭弧试验和MATLAB建立的灭弧间隙仿真模型进行分析,灭弧防雷间隙可以抑制雷击闪络后引发的弧光过电压。Single-phase ground fault of insulator due to lightning flashover will lead to arc grounding over-voltage by intermittent arc, which damages the insulation and harms the safe operation of power grid. Therefore, a parallel air-blast interruption gap was developed based on the idea of ＂conducting＂ type lightning protection and the ＂air-blast＂ arc interruption scheme. The gap can conduct lightning current into the earth rapidly, and meanwhile start the high-speed arc interruption device to interrupt continuous current at fault point and restrain inhibit intermittent arc and over-voltage. Experiment of small current arc interruption and MATLAB based simulation with the air-blast interruption gap model indicate that the air-blast interruption gap can inbibit arc grounding over-voltage caused by lightning flashover.

关 键 词：雷击闪络 弧光过电压 改进Mayr电弧模型 

分 类 号：TM862[电气工程—高电压与绝缘技术]