超高压线路简化整定计算的原则和方法

随着超高压电网的逐步强大和继电保护技术的不断进步,简化线路后备保护的整定计算是切实可行的。提出了超高压线路后备保护的简化整定计算原则和距离保护及定时限零序保护简化整定计算的方法,重点讨论了距离Ⅰ段可靠系数、零序补偿系数、距离Ⅱ段灵敏系数和距离保护躲最小负荷阻抗的计算方法。同时简单介绍了线路后备保护整定计算中选择运行方式的优化方法。采用这些原则和方法,既保证了整定值的正确、科学和合理,又能够提高整定计算工作的效率。

Rules and methods for simplifying setting calculation of protections of extra-high voltage transmission line

The setting calculation of backup protections of transmission line can be simplified with the stronger function of extra-high voltage power network and advancement of relay protection technology.Some rules and methods for simplifying setting calculation of distance protection and definite-time residual current protection are proposed,especially the setting calculation methods for reliability factor of zone I distance protection,sensitive factor of zone II distance protection,minimum-load-avoiding impedance and zero-sequence current compensate coefficient.The optimized method of selecting operation mode in the process of setting calculation for transmission line backup protection is also discussed briefly.The use of these setting calculation rules and methods can enhance the performance of setting value and the efficiency of setting calculation process.