山区35kV电网电气参数测试及分析  

Electrical Parameter Testing and Analysis of 35 kV Power Grid in Mountainous Area

作　　者：李历波[1] 刘渝根[2] 

机构地区：[1]重庆市电力公司綦南供电局,重庆401420 [2]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030

出　　处：《高压电器》2011年第8期91-96,共6页High Voltage Apparatus

基　　金：国家创新研究群体基金(51021005)~~

摘　　要：为研究山区35 kV电网雷击跳闸事故原因,提出有效的防雷措施。通过对山区35 kV电网电气参数进行现场测试,为山区35 kV系统的计算研究、运行维护及设计等提供了实际参数。结果显示:山区35 kV电网其单相接地电容电流超过了10 A,应采用中性点经消弧线圈接地运行方式;由于线路不进行均匀换位,使得其线路三相对地电容不对称,从而导致中性点经消弧线圈接地系统,三相电压不对称,消弧线圈整定困难,不能同时满足失谐度整定和三相电压对称的要求。In order to study the causes of the lightning trip for 35 kV power gnd in mountainous area, anu to bring up effective lightning protection, the scene testing of electric parameter to 35 kV grounding grid in mountainous area is carried out and the actual parameter for the calculation, study, operation, maintenance and design of 35 kV system in mountainous area is gotten. The results show that the single phase grounding capacitive current of 35 kV power grid in mountain exceeds 10 A, so the neutral point for the 35 kV power system should be grounding through the arc suppression coil. Because the 35 kV transmission lines is not transposition, the capacitances to ground of the three conductors and the three phase voltages are asymmetry. It is difficult to select the arc suppressing coil winding to satisfy the requirements of system,and the suppressing coil cannot extinguish grounding arc effectively in fault.

关 键 词：35 kV线路防雷 电气参数 单相接地电容电流 测量 三相电压不平衡 消弧线圈过补偿 

分 类 号：TM862[电气工程—高电压与绝缘技术]