电网技术2017，Vol.41Issue(7)：2401-2406,6.DOI:10.13335/j.1000-3673.pst.2016.2992
配电网雷击防护压缩效应切分电弧游离特性
Research on Characteristic of Free Arc Segmented by Compression Effects of Distribution Network Lightning Protection
摘要
Abstract
Low lightning resisting level and complex structure of distribution network are weak links of lightning protection of power grid. Direct lightning stroke and induced flashover can easily lead to lightning overvoltage, resulting in electrical equipment damage, line trip and other adverse consequences. In recent years, although number of new lightning protection measures appear, but there are still lightning trip-out rate increase, short-lived service period and many other difficulties in engineering practice. By studying mass and energy flow change characteristic of free arc under condition of thin tube restriction, it is found out that self-expanding air flow accumulated by compression effect can accelerate de-ionization of free arc and quickly cut short-circuit arc. Through simulation and experimental verification, arc-extinguishing device in actual line operation was analyzed. It is concluded that compression effects can accumulate self-expanding air flow. In experiment and simulation the arc were reliably extinguished within 1000 μs. Application of arc-extinguishing device in 10 kV line achieved excellent operating results, and lightning trip-out rate was greatly reduced.关键词
压缩效应/电弧/自膨胀气流/配网/防雷保护Key words
compression/arc/self-expanding air flow/distribution network/lightning protection分类
信息技术与安全科学引用本文复制引用
戴琦,王巨丰,郑传啸,李籽剑,丰德..配电网雷击防护压缩效应切分电弧游离特性[J].电网技术,2017,41(7):2401-2406,6.基金项目
国家自然科学基金项目(51467002).Project Supported by National Natural Science Foundation of China (51467002). （51467002）
