摘要
针对带并联电抗器的超高压输电线路,提出一种单相自适应重合闸永久性故障识别的新方法。该方法以瞬时性故障为参考模型,求取并联电抗器故障相电流,采用该求取电流与并联电抗器故障相实际测量电流之差同中性点小电抗器电流幅值比来实现永久性故障的判别。发生瞬时性故障时,故障模型正确,差电流幅值比接近零;发生永久性故障时,故障模型不正确,差电流幅值比远大于零。ATP仿真结果表明,该方法能够准确区分瞬时性故障和永久性故障,判别原理有效,能够可靠地实现超高压输电线路的单相自适应重合闸。
A novel method of identifying permanent fault for single-phase adaptive reclosure in transmission lines with shunt reactors is proposed. After the tripped phase current from shunt reactor was calculated using the transient fault model as the prototype whether transient or permanent fault, the difference between the calculated current and the measured one of the fault phase from shunt reactor was employed to identify permanent fault. When the single-phase fault is transient, the calculated current is close to the actual measured current. But for permanent fault, the currents are quite different. Therefore, an algorithm using the amplitude ratio of the differential current to the current in neutral reactor was developed to identify permanent fault. ATP simulations show that the proposed algorithm can identify permanent fault correctly and reliably, and promises to be applied to single-phase adaptive reclosure for transmission lines with Shunt reactors.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2008年第28期80-85,共6页
Proceedings of the CSEE
基金
国家自然科学基金项目(50677051)
高等学校博士学科点专项科研基金资助项目(20060698014)~~
关键词
继电保护
输电线路
自适应重合闸
并联电抗器
电流幅值比
protective relaying
transmission line
adaptive reclosure
shunt reactors
current amplitude ratio
