一个变压器保护的程序，是配电变电所内的保护程序-A transformer protection program, is within the power distribution substation protection program

开关电源的拓扑指开关电源电路的构成形式。一般是根据输出地线与输入地线有无电气隔离，分为非隔离及隔离变换器。非隔离即输入端与输出端相通，没有隔离措施，常见的DC/DC变换器大多是这种类型。-Switching power supply topology refers to the form of switch power supply circuit. Is generally based on input and output ground ground for electrical isola

电力系统绘图软件，可绘制导线、电源、单双三绕变压器、开关等，但缺少移动功能。-Drawing software in power system, can draw the wires, power supply, single and double three winding transformer, switch, etc., but the lack of movement function.