发电机定子单相接地故障电阻在线监测研究  

Study of online monitoring of the stator single-phase grounding fault resistance in generator

作　　者：罗建[1] 熊再豹[1] 张强[2] 杨健[2] 张长春 李松林[1] 

机构地区：[1]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400044 [2]许继集团有限公司,河南许昌461000 [3]重庆电力公司万州供电局,重庆404000

出　　处：《电力系统保护与控制》2010年第20期136-140,共5页Power System Protection and Control

基　　金：国家111计划项目(B08036)

摘　　要：针对目前基波零序电压型和三次谐波型发电机定子单相接地保护不能计算接地故障电阻的情况,提出了一种在线监测单相接地故障电阻的方法,以便实时监测发电机由于绝缘降低而引发的单相接地故障。结合行波故障定位功能,提出了在发电机零序网络结合三次谐波等效电路中建立定子接地电阻的计算模型,运用发电机定子单相接地多回路仿真模型对某大型发电机进行仿真验证。仿真数据表明了所提出的方法是准确可行的。On the condition that the grounding resistance on the stator single-phase grounding fault can＇t be monitored by the stator ground relay based on third harmonic voltage and zero-sequence fundamental voltage,a method for monitoring the grounding resistance online is proposed.At first,fault location by traveling wave is used,and then the model combined zero sequence equivalent circuit diagram with equivalent third harmonic circuit of stator ground fault to calculate the grounding resistance online is presented.At last,a large generator is simulated with the multi-loop analysis model to test the method,and the simulation data verify the feasibility of the method.

关 键 词：发电机保护 定子单相接地 接地故障电阻 在线监测 

分 类 号：TM31[电气工程—电机]