消弧线圈接地方式下外加20Hz电源定子接地保护的应用  

Application of Injecting 20 Hz Voltage Based Ground Fault Protection for Generators Grounded via Petersen-coil

作　　者：毕大强[1] 王祥珩[1] 余高旺 李德佳 王维俭[1] 

机构地区：[1]清华大学电机系,北京市100084 [2]许继电气保护及自动化事业部,河南省许昌市461000 [3]核电秦山联营有限公司,浙江省海盐县314300

出　　处：《电力系统自动化》2005年第4期82-84,共3页Automation of Electric Power Systems

基　　金：中国博士后科学基金资助项目(2004035022)

摘　　要：外加20Hz电源定子接地保护在发电机中性点经配电变压器高阻接地方式下已有很多工程应用,但其在中性点经消弧线圈接地的发电机上还没有成功的应用经验。文中分析了外加20 Hz电源定子接地保护应用在发电机中性点经消弧线圈接地与中性点经配电变压器高阻接地存在的差别,包括计算故障过渡电阻的等值电路、消弧线圈工作参数选择与计算等,为外加20 Hz电源定子接地保护在中性点经消弧线圈接地的发电机上成功应用提供了依据,其结果已被现场试验验证。At present there are no successful application experiences of injecting 20 Hz voltage based ground fault protection for generators grounded via Petersen-coil, although it has been adopted in some power stations, where the neutral of generator is grounded via distribution transformer paralleled resistance on secondary side. This paper analyzes the problems when applying this protection to the generators grounded via Petersen-coil, including the equivalent circuit to calculate the grounding transition resistance and how to choose and calculate the running parameters of Petersen-coil, which provides the base for the application of protection to the generators grounded via Petersen-coil. The analysis is verified by some field experiments.

关 键 词：发电机 外加电源 定子单相接地保护 消弧线圈 

分 类 号：TM862[电气工程—高电压与绝缘技术]