一种新型振荡中故障选相元件  

A New Type of Fault Phase Selector During Power Swing

作　　者：毛鹏[1] 戴斌[1] 白日昶 

机构地区：[1]江西省电力公司超高压分公司,江西省南昌市330006

出　　处：《电力系统自动化》2009年第5期61-65,共5页Automation of Electric Power Systems

摘　　要：振荡中故障准确选相是有选择切除故障和确保距离保护正确动作的前提。在分析现有振荡中选相元件需开放条件配合,导致出口延迟,且易出现误选,进而导致距离保护误动的基础上,提出了一种新型选相元件,此元件首先利用零、负序故障分量进行故障分区,在分区的基础上改变目前采用阻抗确定故障相的做法,而采用Clark变换,分别通过α,β模量信息进行故障选相。此选相方法充分发挥了零、负序故障分量以及模量变化在振荡期间不涉及相量偏移带来计算误差等优势,有效避免了阻抗选相在振荡中的弊端。文中给出了基于RTDS动模仿真数据的测试结果,理论和测试表明:此方法在振荡期间能够可靠、快速、准确地区分故障类型。The result of fault phase selector during power swing is a precondition to switch off the correct fault phase and ensure the right operation of distance protection relays. Based on the analysis of the performances of present selector during power swing, such as the delay of operating and being easy to select false fault phases, and therefore causing false operating of distance protection relay, a novel fault phase selector is presented. The selector firstly uses the zero-sequence and negative-sequence components to distinguish the different fault types, and based on the fault phase recognition, the impedance measure in the presented selector is not used, and Clark transformation is adopted and the model components of a and fl are used to select the farther fault phases. This selector fully utilizes the characteristics of zero-sequence, negative-sequence, and the advantages of model components, such as little computation error without phasor deflection during power swing. It can effectively avoid the malpractices of impedance selector during power swing. The simulation results based on RTDS are presented, and the theory and testing results show that this phase selection measure can quickly and correctly select the fault phases during power swing in an reliable way.

关 键 词：线路保护 故障选相 模变换 振荡 

分 类 号：TM773[电气工程—电力系统及自动化]