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水轮发电机定子单相接地故障行波定位
引用本文:党晓强,刘俊勇,杨可,雷霞.水轮发电机定子单相接地故障行波定位[J].电力系统自动化,2006,30(23):74-78.
作者姓名:党晓强  刘俊勇  杨可  雷霞
作者单位:四川大学电气信息学院,四川省,成都市,610065
摘    要:针对行波在水轮发电机定子绕组槽部和端部的传播特征分别建立其暂态电路网络模型,提出应用小波理论对定子接地行波信息进行分析来确定故障点的位置。讨论了行波速度计算的数学模型和无需波速基于相模变换,由线模量和地模量确定接地点位置的算法,解释了小波分析提取行波信号的原理。在MATLAB 6.5环境中针对一台大型水轮发电机的参数进行建模,叠加等效电源对其定子接地行为进行仿真。由小波分解的行波高频部分对行波传播的时间特征进行确认,对波速已知和未知时的接地点定位算法进行比较分析,仿真结果分析表明了该方法应用于水轮发电机接地故障定位的合理性及可行性。

关 键 词:故障定位  行波理论  小波变换  水轮发电机  定子接地  在线监测
收稿时间:1/1/1900 12:00:00 AM
修稿时间:1/1/1900 12:00:00 AM

Location for Stator Single Phase to Ground of Hydro-generators Based on Fault Traveling Waves
DANG Xiaoqiang,LIU Junyong,YANG Ke,LEI Xia.Location for Stator Single Phase to Ground of Hydro-generators Based on Fault Traveling Waves[J].Automation of Electric Power Systems,2006,30(23):74-78.
Authors:DANG Xiaoqiang  LIU Junyong  YANG Ke  LEI Xia
Affiliation:Sichuan University, Chengdu 610065, China
Abstract:Aimed at the radiate characters of the traveling waves in the slot and outside, the transient circuit models for hydro-generator stator windings are built. By applying the wavelet theory, the traveling signals of the grounding stators are analyzed to locate the fault point. The mathematical model for the speed of traveling waves is discussed. Algorithms to locate the fault point by the wave' s aerial and ground modes are also discussed without knowing the phase to modulus transformation for speed. Wavelet theory for picking up traveling waves is illustrated. Circuit model is built with the tool of MATLAB 6.5 based on the parameters for a large salient generator and an AV source is added to simulate the grounding behavior of the stators. The traveling time characteristic of the radiate traveling-wave is ensured in high frequency layer after the wavelet decomposed. The grounding point location methods with either the speed of traveling waves known or unknown are compared and analyzed and the simulation results demonstrate the validity and feasibility of the above techniques.
Keywords:fault location  traveling wave theory  wavelet transform  hydro-generator  stator to ground  on-line monitoring
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