继电保护中分支系数的计算技巧应用分析  

Calculation of Branch Coefficient in Relay Protection of Power System

作　　者：赵红梅 张军 李春松 Zhao Hongmei;Zhang Jun;Li Chunsong(Huali College,Guangdong University of Technology,Guangzhou 511325,China;Guangdong Province Huali Technician College,Guangzhou 511325,China)

机构地区：[1]广东工业大学华立学院,广州511325 [2]广东省华立技师学院,广州511325

出　　处：《机电工程技术》2022年第1期91-93,204,共4页Mechanical & Electrical Engineering Technology

摘　　要：在距离保护时,为了实现上下级线路的保护配合,需要在定值计算时引入一个分支系数。但是在复杂的电力系统网络结构中,分值系数求取一直是个难点。在距离保护整定计算分支系数时,选定保护装置后,需要根据保护装置的结构原理、相电流差、零序电流突变量启动元件、选相元件的影响,将距离保护元件的动作特性曲线结合起来进行特定的计算。针对距离保护Ⅱ段的分支系数进行公式推导,将线路的网络图等效转换为电路图,通过对电流计算公式的推导,得到电抗计算公式,从而简化分支系数的计算。最后分析距离保护的分支系数在不同网络中运行方式和短路点位置的选取,为顺利进行继电保护整定计算提供帮助。In distance protection,in order to realize the protection cooperation between upper and lower lines,it is necessary to introduce a branch coefficient in setting calculation.However,in the complex power system network structure,the calculation of score coefficient has always been a difficulty.When calculating the branch coefficient for distance protection setting,after selecting the protection device,it is necessary to combine the action characteristic curve of distance protection element for specific calculation according to the structural principle of the protection device,phase current difference,zero sequence current sudden variable starting element and phase selection element.The branch coefficient of distance protection section II was deduced,and the network diagram of the line was equivalent to the circuit diagram.Through the derivation of the current calculation formula,the reactance calculation formula was obtained,so as to simplify the calculation of the branch coefficient.Finally,the operation mode of branch coefficient of distance protection in different networks and the selection of shortcircuit point position were analyzed,which provided help for the smooth setting calculation of relay protection.

关 键 词：电力系统 继电保护 分支系数 距离保护 整定计算 

分 类 号：TH117.1[机械工程—机械设计及理论]