【摘要】 提出了一种估算基于金属氧化物限压器(MOV)保护的串补系统三相短路电流的新方法——图解法。该方法借助于图形和网络等值技术来计算带非线性元件(如MOV)的电力系统短路电流,为系统规划工程师提供了计算短路电流和确定断路器等设备的电流额定值的简单方法。并采用电磁暂态分析程序(EMTP)进行了仿真实验,仿真结果也证实了上述图解法的有效性和较高的精度。文章还进一步讨论了计算短路故障时全网分支电流的方法。更多还原

【Abstract】 An approach to estimate the three phase short circuit current in power system with MOV protection based series compensation by graphic method is presented, in which the short circuit current in the power system with non-linear element such as the MOV is calculated by means of the network equivalent technology and graphic method, therefore a simple method that can be used to calculate the short circuit currents and to determine the rated value of currents of the equipments such as circuit breakers, etc., is provided for the system planning engineers. The presented approach is verified by the simulation with EMTP and the simulation results show that this approach is effective and accurate. In addition, calculation of the branch currents of the whole network under three phase fault is discussed.更多还原