配电网络单相故障馈线的S变换检测新方法  

S-Transform Approach for Detecting the Single-phase Fault Feeder in Distribution Network

作　　者：束洪春[1] 彭仕欣[2] 

机构地区：[1]昆明理工大学电力工程学院,昆明650051 [2]云南电网公司昆明供电局,昆明650011

出　　处：《高电压技术》2009年第12期2963-2969,共7页High Voltage Engineering

基　　金：国家自然科学基金(50977039;50847043;90610024;50467002;50347026);云南省自然科学基金项目(2005F0005Z;2004E0020M)~~

摘　　要：配电网络单相接地故障行波频率分布在几十～几百kHz范围，应用S变换检测故障行波几十kHz的高频暂态量来实现配网故障选线。故障配网母线零模电压的S变换幅值矩阵最高频率行中幅值最大的分量所对应的时刻即为母线零模电压的突变时刻，借此标定故障电压行波首波头到达母线的时刻，并记为故障初瞬。以故障初瞬保护安装处TA检测的故障线路电流行波与健全线路的电流行波的相位相反为依据，对故障零模电流进行S变换，故障线路与健全线路零模电流S变换辐角矩阵的最高频率行的辐角在故障初瞬相差180°，借此检出故障线路。该方法从行波中相对低的高频暂态量的层面检测行波信号相位特性，降低了对行波高速采集和处理速度的要求，耐受高阻接地和抗噪能力强。大量数字仿真试验表明，选线结果准确、可靠.In distribution network with single-phase fault, the frequency ranging of traveling wave is the from tens of kHz to hundreds of kHz. When the S-transform is implemented to determine the fault line in distribution network by detecting the tens of kHz high frequency transient component of the fault traveling wave, the moment corresponding to the maximum component in the highest frequency row of the S-transform magnitude matrix of zero modal bus voltage is the real mutation moment of zero modal bus voltage. Then the moment of the first fault traveling wave front is calibrated and recorded as the beginning moment of single-phase fault occurrence. At this moment, the phases of initial current traveling wave front in fault line and sound lines detected by TA at the protection relay device are opposite. The S transform is implemented to fault zero modal currents. The argument difference of the highest frequency row between fault line and sound line is 180° after fault, which makes fault line detectible. The proposed method detects the phase characteristics of traveling wave signal from relatively low high-frequency transient component, which can not only reduce the requirements of traveling wave acquisition and processing speed, but also enhance the capability of high resistance tolerance and anti noise ability. The simulation results demonstrate the feasibility and validity of this approach.

关 键 词：配电网 故障选线 故障行波 S变换 行波检测 辐角比较 

分 类 号：TM755[电气工程—电力系统及自动化]