摘要
为了实现超高压和特高压输电线路的故障快速诊断,将序电流相位差技术应用到输电线路高阻抗故障选相中。开展了三相网络单相接地故障和相间接地故障分析,通过零序和负序电流分量相位差对故障相区间进行了划分,建立了序电流相位差、相阻抗、相间阻抗、3段距离继电器保护范围与故障类型、故障相别的关系;提出了一种以序电流相位差为判断依据的超高压和特高压输电线路高阻抗故障选相新方法;在500 kV,400 km的输电线路上对该故障选相方案的精确性及可靠性进行了评价,并进行了RTDS仿真测试。研究结果表明:该故障选相方案能够实现精确可靠的识别,并有足够的边际应对意外因素或计算误差,即使在电网振荡时,也可以实现可靠的系统故障相识别。
In order to realize the fault diagnosis quickly for EHV or UHV power transmission line,the technology of sequence current phase difference was applied to the phase selection of high-impedance fault on transmission line.After the analysis of the single-phase-to-ground fault and two-phase-to-ground fault in three-phase network,the phase-to-phase fault was partitioned based on the phase difference of negative and zero sequence current components.The relationship between the fault type,fault phase and the protection region of sequence current phase difference,phase impedance,phase-to-phase impedance and 3-stage distance relay was established.A method was presented to judge the phase selection of high-impedance fault on EHV or UHV power transmission line based on sequence current phase difference.The accuracy and reliability of this fault phase selection scheme were evaluated for the 500 kV,400 km transmission line,and RTDS experimental simulations were tested.The experimental results show that the accurate and reliable recognition of this fault phase selection scheme can be realized,the unexpected factor can be dealt with,and error can be calculated with so enough time,the fault phase selection can be reliably realized,even if the system is on power grid oscillations.
出处
《机电工程》
CAS
2013年第5期614-618,共5页
Journal of Mechanical & Electrical Engineering
基金
浙江省自然科学基金资助项目(Y1110557)
2010年衢州市科技计划资助项目(20111056)
关键词
输电线路
序电流相位差
超高压
特高压
故障选相
故障诊断
transmission lines
sequence current phase difference
extra-high voltage（EHV）
ultra-high votage（UHV）
fault phase selection
fault diagnosis
