摘要
在典型的六相输电系统中,半正序、半零序和半负序故障分量不受系统阻抗变化的影响。文中提出了基于上述3种故障序分量的方向保护判据,并且将其综合在一起,构成了一种适用于六相输电线路的纵联方向保护方案。该方案能够根据故障的特性自动选择方向判据,并且能够反映除六相短路以外的所有故障。补充正序突变量判据以后,该方案能够判别六相短路故障。EMTDC仿真结果表明,该纵联方向保护方案不受系统阻抗和故障点过渡电阻的影响,原理简单、可靠,动作速度快。
In typical six-phase transmission system, half positive sequence, half zero sequence and half negative sequence fault components are independent of the variance of system impedance. A new comprehensive scheme, i.e. directional comparison pilot protection for six-phase transmission lines is presented based on the above mentioned three fault sequence components. It can automatically select the proper criterion according to the characteristics of faults, and reflect all faults except f-phase fault on a transmission Line. By adding positive sequence fault components of voltage and current, it can identify the direction of 6-phase fault. The results of EMTDC simulation confirm that the proposed scheme is unaffected by system impedance and transition resistance. Hence it is simple, reliable and rapid.
出处
《电力系统自动化》
EI
CSCD
北大核心
2007年第3期57-60,85,共5页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(50477037)~~
关键词
六相输电
故障序分量
纵联方向保护
电力系统
six-phase transmission
fault sequence component
directional comparison pilot protection
power systems
