供电网潮流计算、短路电流计算分别针对开式电网和闭式电网，给出了开发的基本方法。
Calculations of power net tide and short circuit have obtained basic methods of developing to contrapose open or close net.
①分别接通各个接触器，依次拨通相应的限位开关和过电流继电器常闭触头，查看其切断控制电流的能力。
Respectively through the various contacts, in order to dial the corresponding limit switches and over current relay normally closed contacts, to see the ability to cut off the control current.
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