ABB BAILEY INIIT13 INTKM01 N***01
变压器的短路阻抗，是指在额定频率和参考温度下，一对绕组中、某一绕组的端子之间的等效串联阻抗Zk＝Rk+jXk。由于它的值除计算之外，还要通过负载试验来确定，所以习惯上又把它称为阻抗电压。变压器的短路阻抗值百分比是变压器的一个重要参数,它表明变压器内阻抗的大小，即变压器在额定负荷运行时变压器本身的阻抗压降大小。
变压器短路阻抗怎么计算？
用试验求取的方法为：将变压器二次侧短路，在一次侧逐渐施加电压，当二次绕阻通过额定电流时，一次绕阻施加的电压Uz与额定电压Un之比的百分数,即：Uz%=Uz/Un×100%。
变压器短路阻抗的大小有什么影响？
变压器短路阻抗也称阻抗电压，在变压器行业是这样定义的：当变压器二次绕组短路（稳态），一次绕组流通额定电流而施加的电压称阻抗电压Uz。通常Uz以额定电压的百分数表示，即uz=(Uz/U1n)*100%。
变压器的短路阻抗在运行中有什么作用？ 当变压器满载运行时，短路阻抗的高低对二次侧输出电压的高低有一定的影响，短路阻抗小，电压降小，短路阻抗大，电压降大。当变压器负载出现短路时，短路阻抗小，短路电流大，变压器承受的电动力大。短路阻抗大，短路电流小，变压器承受的电动力小。
阻抗电压是涉及变压器成本、效率及运行的重要经济技术指标。同容量变压器，阻抗电压小的成本低，效率高，价格便宜，另外运行时的***及电压变动率也小，电压质量容量得到控制和保证，所以在制造变压器时，必须根据满足设备运行条件来设计阻抗电压，且应尽量小一些。
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