高压电力变压器雷击跳闸故障危害预测及抑制方法  

Prediction and Suppression Methods of High Voltage Power Transformer Trip Fault Caused by Lightning

作　　者：王俊波[1] 罗容波[1] 李雷[1] 张博[2] 鲁铁成[2] 

机构地区：[1]广东电网公司佛山供电局,广东佛山528000 [2]武汉大学电气工程学院,武汉430072

出　　处：《电瓷避雷器》2015年第4期123-127,132,共6页Insulators and Surge Arresters

基　　金：广东电网有限责任公司科技项目"电网暂态冲击引起紧凑型变压器重瓦斯误动作机理及应对措施研究"(编号:K-GD2014-0189)

摘　　要：电网暂态冲击是引起紧凑型变压器本体重瓦斯保护误动作的原因,会造成高压电力变压器跳闸,影响供电的可靠性。为精确预测高压电力变压器雷击跳闸故障的危害情况,本文通过对实际线路进行仿真计算,得到发生雷击闪络形成稳定工频电弧时的短路电流。将雷击各杆塔号产生的短路电流与变压器本体重瓦斯误动作短路电流值进行比较,计算雷击杆塔造成变压器重瓦斯误动作的概率,提出抑制变压器本体重瓦斯误动作的技术措施。Power system transient shock is the causation of the compact transformer heavy gas protection malfunction. It will cause high voltage power transformer trip and influence the reliability of power supply. In order to accurately forecast the condition of high voltage power transformer trip damage by lightning, the actual line is simulated and calculated to get the short-circuit current of stable power frequency arc which occurs at the moment of lightning flashover. The short-circuit current generated by lightning each tower with the short-circuit current value of the transformer heavy gas protection malfunction is compared and the probability of heavy gas protection malfunction caused by lightning is calculated. The technical measures of suppressing heavy gas transformer malfunction are presented.

关 键 词：高压电力变压器 重瓦斯误动作 雷击杆塔 工频短路电流 限制措施 

分 类 号：TM862[电气工程—高电压与绝缘技术] TM41