摘要
提出了一种基于分相复合阻抗的输电线路纵联保护新原理,它根据线路两端电压、电流故障分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。经理论证明,所提出基于输电线路分相复合阻抗的纵联保护原理及相应的保护判据,可相互补偿用单个分相阻抗计算时所出现保护的死区。该原理不仅易于整定、具有自选相功能,而且性能可靠、动作灵敏、适应性强,EMTP数字仿真结果验证了新原理的有效性。
A novel transmission line pilot protection principle based on the composite impedance of individual phase is proposed. The impedance is calculated from the fault component of the voltages and currents at both terminals of the line, and then used for judging whether the fault is occurred at the line. When the fault is outside of the protected area, the impedances just equals to the positive impedance of whole length of the transmission line, while it will obviously differ from the value when the fault is inside of the protected area. It is shown that the proposed transmission line pilot protection principle based on the individual phase composite impedance and the corresponding protection criterion can mutually compensated the dead zone existed in using single individual impedance. The proposed protection has the characteristics of ease-setting, independent phase selection, and possesses identity of reliable performance, sensitive operation, and strong adaptation. The EMTP simulation results show the effectiveness of the presented principle.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2009年第31期80-86,共7页
Proceedings of the CSEE
基金
国家自然科学基金项目(50677051
50877061)
高等学校博士学科点专项科研基金项目(20070698057)~~
关键词
输电线路
故障分量
纵联保护
两端电气量
分相阻抗
transmission line
fault component
pilot protection
two-terminal electrical quantities
individual-phase impedance
