高电压技术2012，Vol.38Issue(2)：280-287,8.
特高压交流输电系统短路电流零点漂移影响因素分析及防治措施
Analysis on Characteristic and Influencing Factors of Current-zero Offset in UHVAC Systems
摘要
Abstract
In an ultra-high transmission system,circuit breakers will have a higher transient over-voltage when failure occurs on the transmission line,the DC component may cause the current-zero offset,it will make the arcing time extension in the arc chute and affect the breaking capacity of circuit breaker.Consequently,we theoretically analyzed the influential factors of the current-zero offset on the UHV demonstration project.Moreover,considering the arc model of the disconnected circuit breaker,we utilized ATP/EMTP to simulate the Zhejiang North-Shanghai West ultra-high voltage transmission lines.The conclusion can be drawn that,the failure time,the size of the grounding fault resistance,the location of the failure point,and the value of the load current are influential factors of the current-zero offset.Changes in load current may cause the current-zero offset to be more serious for more than two cycles.A 50 Ω closing resistor in series at the port of the circuit breaker can effectively reduce the first zero-crossing time of the short circuit current.关键词
特高压交流/直流分量/短路电流/零点漂移/断路器/电弧模型/合闸电阻Key words
UHVAC/DC component/short circuit current/current-zero offset/circuit breaker/electrical arc model/closing resistor分类
信息技术与安全科学引用本文复制引用
林莘,谢寅志,王飞鸣,徐建源..特高压交流输电系统短路电流零点漂移影响因素分析及防治措施[J].高电压技术,2012,38(2):280-287,8.基金项目
国家自然科学基金 （）
高等学校博士学科点专项科研基金 （）
教育部高等学校科技创新工程重大项目培育资金 （）
辽宁省教育厅项目（2006R40 （）
2008T134）~~ （）
