摘要
提出了一种基于故障全量的分相复合阻抗输电线路纵联保护原理,它根据线路两端电压、电流故障全量差的比值引入分相阻抗,并以计算得到的阻抗数值判断故障是否发生在区内.在区外故障时,分相阻抗等于线路全长的正序阻抗;在区内故障时,分相阻抗明显偏离上述正序阻抗.该原理为幅值判据,不仅易于整定、具有自选相功能,而且性能可靠、动作灵敏、适应性强,EMTP数字仿真和动模试验结果验证了其有效性.
A transmission line pilot protection principle based on the composite impedance of individual phase is proposed. The individual phase impedances are calculated from the fault total content differences of the voltages and currents at both terminals of the line, and then used for judging if the fault is occurs at the line. If the fault is outside of the protected area, the individual phase impedances just equal to the positive sequence impedance of whole length of the transmission line, while they will obviously differ from the determined value in case of the fault inside of the protected area, which refers an amplitude criterion. The proposed protection with independent phase selection possesses identity of reliable performance, sensitive operation, and strong adaptation. The EMTP simulation and the dynamic simulation test results indicate the effectiveness of the presented principle.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2010年第2期92-97,共6页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(50677051
50877061)
高等学校博士学科点专项科研基金资助项目(20070698057)
关键词
输电线路
故障全量
纵联保护
transmission line
fault total content
pilot protection
