數(shù)字量輸入輸出模塊DIO232 

視在功率（KVA或VA）。

  P，有功功率（KW或W）。

  Q，無功功率，也就是通常要計算的無功補償量（Kvar或var）。

  cosΦ，功率因數(shù)。

  電動機這類負載還存在一個效率比，即有用功率對驅動功率之比值。

  要計算Q，要知道S，P，cosΦ這三個中的任何2個值，通常設備上會標注設備的額定功率，功率因數(shù)以及效率比。

  有功功率P=額定功率Pe/效率比

  視在功率S=P/cosΦ或Q/sinΦ，

  S，P，Q存在一個總的關系是S2=P2+Q2，P即設備的有功功率是固定不變的。

數(shù)字量輸入輸出模塊DIO232
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