高压线路新型电流差动保护原理与整定方法

Principle and Setting Method for New-Type Current Dif ferential Protection of High-Voltage Transmission Line

对高压线路新型电流差动保护的原理进行了分析 ,说明新型电流差动保护实际上是比较在一定时间内累积的两端电荷流动的相对方向 ,并用电磁场理论初步说明了其物理意义 ,证明了新型电流差动保护原理的正确性。文中还对新型电流差动保护实现时的整定计算方法进行了讨论 ,定量分析了保护判据中动作门槛值的整定计算方法 。

With the development of communication technolog y, the current differential protection will act as the primary protection of high -voltage transmission line. In this paper, the principle and setting method of a new type current differential protection of high-voltage transmission line is analyzed. In fact, the new-type current differential protection principle is t o compare with the relative directions of the accumulated electric charge flow a t two ends in a certain time period. The physical significance is described in b rief by using electromagnetic field theory, and the validity of the new-type cu rrent differential protection principle is proved. The setting calculation metho d of realization of the new-type current differential protection is discussed, and the quantitative analysis of the threshold setting values of the trip out cr iterion is carried out. This research shows the new-type current differential p rotection has a high sensitivity, fast speed, simple setting method, and great s ignificance for application of the new-type current differential protection in practice.