重要用户10 kV保护整定计算探讨

用户用电设备的一般配置从用户10 kV变压器出线开关、用户进线开关、到变电站出线开关至少有三级保护的配合。由于系统短路阻抗越来越小，10 kV用户专线距离变电站较近，电流保护的整定值较大，可能造成无保护区或灵敏度不够，上、下级保护之间的配合问题日益突出。以青岛国际奥帆中心10 kV变电站为例，对其10 kV供电系统保护定值整定计算中存在的一些问题进行了分析与探讨，主要对整定配合原则进行调整，对时间级差设置为0.3 s达到上下级保护间合理配合，对提高重要用户的供电可靠性有重要意义。

Discussion on 10 kV relay protection setting calculation of major users

There are three-stage cooperation of relay-protection from the 10 kV transformer out-line switch,the user into-line switch,to the substation out-line switch in the general allocation of electrical equipment users at least.As the power system short-circuit impedance is getting smaller and smaller,the distance between the user and 10 kV substation is getting closer,the setting of current-protection is becoming bigger and bigger.Therefore,these may cause the condition of no protected areas or sensitive enough,...