自适应型相位动态延时相继合闸方式抑制500kV过补偿线路直流偏置的试验研究  

Experimental Research on the Depression of DC Offset of 500kV Over Compensated Transmission Lines by Self-adaptive Successively Closing with Dynamic Phase Delays

作　　者：张佳鑫 魏颖莉 郑雄伟 曹树江 贾伯岩 李海涛[3] 刘杰 张志猛 孙翠英 伊晓宇 ZHANG Jiaxin;WEI Yingli;ZHENG Xiongwei;CAO Shujiang;JIA Boyan;LI Haitao;LIU Jie;ZHANG Zhimeng;SUN Cuiying;YI Xiaoyu(State Grid Hebei Electric Power Research Institute,Shijiazhuang 050021,China;State Grid Hebei Electric Power Co.,Ltd.,Shijiazhuang 050021,China;Nanjing Nanrui Jibao Electric Co.,Ltd.,Nanjing 211102,China)

机构地区：[1]国网河北省电力有限公司电力科学研究院,石家庄050021 [2]国网河北省电力有限公司,石家庄050021 [3]南京南瑞继保电气有限公司,南京211102

出　　处：《高压电器》2020年第12期277-285,共9页High Voltage Apparatus

摘　　要：过补偿线路合空线充电电流存在较大的直流偏置分量,使得合闸后空充电流较长时间内没有过零点,在此期间,若断路器意外分闸,将可能导致断路器虽然机械到达分位而触头电弧仍然无法熄灭。在合空线电流产生直流偏置机理分析的基础上,文中提出了相位角控制自适应延时相继合闸方法,将选相位角控制合闸技术和充电电流过零点检测技术相结合,有效解决交流断路器在电流非过零时刻分闸灭弧困难的问题。基于该原理研制的自适应型相位动态延时相继合闸装置在河北南网3条500 kV过补偿线路上进行了试验,文中对工程验证情况进行了总结,分析了500 kV断路器合闸的分散性、选相合闸方式的控制精度以及对直流偏置分量的抑制效果。工程试验表明该方法可以有效的降低过补偿线路合空线时直流偏置的风险。There is a large DC offset in the charging current after closing operation at one side of the no-load overcompensated line,which makes the charging current have no zero-crossing point for a long time.During this period,unexpected opening of the circuit breaker may cause the arc can not be extinguished even the breaker reaches its mechanical breaking point.Based on the analysis of the mechanism of DC offset,this paper proposes a phase angle control and self-adaptive delay sequential closing method for the first time,which combines the phase control closing technology and the charging current zero-crossing point detection technology,and solves the problem of arc-breaking in AC circuit breakers when the current is not zero-crossing effectively.Based on this method,the self-adaptive phase control and dynamic time-delayed sequential devices is developed and tested on three 500 kV over-compensation lines of Hebei south power.The dispersion of closing of 500 kV circuit breaker,the control precision of phase selection closing mode and the restraining effect on DC offset component are summarized in this paper.The engineering test shows that this method can effectively reduce the risk of DC offset after the no-load over-compensated line is closed.

关 键 词：直流偏置 并联电抗器 过补偿线路 自适应 动态延时相继合闸 

分 类 号：TM472[电气工程—电器] TM561