In this program the voltage and current of simultaneous faults or unbalanced power system are calculated by solving the simultaneous equations of multi-port network and of the fault boundary.
本程序应用多端口网络方程和故障端口边界方程联立求解的方法，计算电力系统各种多重故障及任意不对称运行的电压和电流。
The Port is the boundary between the city and the ocean, It has the functions and the characters of the city and the ocean. So Digital Port is also indispensable to Digital Earth.
港口是海洋与城市的交界，因而数字港兼有数字海洋与数字城市的功能与特征，同样是数字地球中一个不可缺少的重要组成部分。
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