As distributed generations are connected to the distribution grid, the short-circuit current direction will change, thus leading to the problems of decrease of sensitivity, refusing action and misoperation of the traditional line protection. This paper introduces the traditional 3-sectional current protection work principle and the setting principle for distribution network. Based on this effect of DG on the relay protection is analyzed. The simulation results also verify the validity of this method.%分布式电源（DG）接入配电网后,改变了原有网络的短路电流流向,会导致原有馈线保护出现灵敏度降低、拒动、误动等问题.本文分析了配电网常用的三段式电流保护工作原理和整定原则,在此基础上分析了分布式电源对配电网电流保护运行影响。通过MATLAB仿真分布式电源并入配电网后在线路后,DG容量发生变化时发生三相短路故障对短路电流保护的影响,仿真结果验证了理论分析的可行性。
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