变压器副边突然短路(secondary winding sudden short circuit)

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  假设:短路前为空载,相当于rK、LK电路在正弦激励下的零状态响应。

变压器副边突然短路(secondary winding sudden short circuit)

图1 变压器突然短路

变压器副边突然短路(secondary winding sudden short circuit)

图2 变压器突然短路等效电路

  设:电源电压

变压器副边突然短路(secondary winding sudden short circuit)                       (1)

  式中:变压器副边突然短路(secondary winding sudden short circuit)为短路瞬间电网电压初相角;

  等效电路:

  列KVL方程:

变压器副边突然短路(secondary winding sudden short circuit)              (2)

  得:

变压器副边突然短路(secondary winding sudden short circuit)  (3)

          稳态分量                瞬变分量

  式中:变压器副边突然短路(secondary winding sudden short circuit)             稳态短路电流有效值;

     变压器副边突然短路(secondary winding sudden short circuit)    短路阻抗角;

     变压器副边突然短路(secondary winding sudden short circuit)                 短路电流衰减时间常数;

  1.当变压器副边突然短路(secondary winding sudden short circuit)(即U1最大)时突然短路

    变压器副边突然短路(secondary winding sudden short circuit);发生稳态短路,短路电流最小,即(10~20)IN

  2.当变压器副边突然短路(secondary winding sudden short circuit)(即U1=0)时突然短路

    变压器副边突然短路(secondary winding sudden short circuit)初始值最大,最严重情况;变压器副边突然短路(secondary winding sudden short circuit),短路后,经半个周期变压器副边突然短路(secondary winding sudden short circuit)时,突然短路电流达到最大值(称为冲击电流)即为(24~36)IN

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