摘要
由于峡谷的下沉式地形特征,经常导致峡谷地区输电线路发生大概率绕击。为降低峡谷线路绕击率,减少大档距线路雷击跳闸,在现有防雷基础上,文章提出了一种措施,即在雷击闪络前,通过雷云场强窜跃信号提前触发高压包产生人工脉冲,主动降低杆塔两端绝缘水平,将档距闪络转移至杆塔。该措施允许雷电弧在档距两端杆塔指定通道内形成冲击疏导,固相气流灭弧防雷装置(Solid-Phase Airflow Arc-Extinguishing Device,SAAED)动作后的灭弧强气流作用于电弧,电弧被吹断后逐渐熄灭,阻止后续工频电弧形成。文章首先对峡谷与平原线路绕击过程进行了对比分析;之后介绍峡谷线路雷击防护方法原理及装置结构,并通过波过程加以分析解释;最后进行雷电冲击试验,验证了高压包提前放电技术能够降低SAAED间隙击穿电压,改善伏秒特性,为后续实践应用提供了研究基础。
Due to the sunken terrain of the canyon,the transmission lines in the canyon area often have a high probability of circumvention.In order to reduce the deflection rate of the canyon transmission line and reduce the lightning strike of the large-distance line,a new method is proposed based on the existing lightning protection.Before the lightning flashover,the thundercloud field strength jump signal triggers the high voltage package to generate artificial pulses in advance,actively reduces the insulation level at both ends of the tower,and shifts the flashover to the tower.This method allows the lightning arc to form impact relief in the designated channels of the two ends of the pole.After the SAAED action,the arc extinguishing strong airflow acts on the lightning arc.The lightning arc is gradually extinguished after being blown off,preventing the formation of power frequency arcs.First of all,this paper makes a comparative analysis of the deflection process of the canyon lines and plain lines.After that,the principle and structure of the lightning protection method for the canyon line are introduced,and the wave process is used to analyze and explain.Finally,a lightning shock test is conducted.The test verified that the technology of high voltage package early discharge can indeed reduce the breakdown voltage of the SAAED gap and improve the voltsecond characteristic.This provides a research basis for subsequent practical applications.
作者
王巨丰
王国锋
李心如
杨倩颖
徐宇恒
庞智毅
张奇星
WANG Jufeng;WANG Guofeng;LI Xinru;YANG Qianyin;XU Yuheng;PANG Zhiyi;ZHANG Qixing(School of Electrical Engineering,Guangxi University,Nanning 530004,China;Shaoxing Power Supply Company,State Grid Zhejiang Electric Power Company,Shaoxing 312000,China)
出处
《电力信息与通信技术》
2021年第6期15-21,共7页
Electric Power Information and Communication Technology
基金
国家自然科学基金项目(51467002)。
关键词
绕击率
高压包
提前放电
人工电弧
SAAED
deflection rate
high voltage package
early discharge
artificial arc
SAAED
