电流互感器变压为100⼀5a,请说明这两个数值各代表什么意思?如与该互感器相连的电能表在某一时间段的计数值

2025-03-18 01:24:32
推荐回答(4个)
回答1:

100/5的电流互感器,代表这个互感器一次侧电流最大充许值为100安,一次侧电流达100安时二次侧感应电流为5A。当一次侧电流超过100A,互感器的精度就会下降,本身的功耗增加,发热严重,易引起计量误差。

这个变比的电流互感器用于低压(0.4KV线路)时,如电能表读数为5.6时,实际电度是 5.6×100÷5=112
这个变比的电流互感器用于高压(10KV线路)时,如电能表读数为5.6,实际电度是 5.6×(100÷5)×(10000÷100)=11200(在高压计量中,使用的是组合互感器,变比还有一个电压的变比,一般都是把高压降为100伏来用于计量。所以在10KV高压计量中还要再乘以10000/100)。

回答2:

首先纠正一点电流互感器变压为100/5a,应为电流互感器变比为100/5A,意思是100:5;即当电流互感器一次侧(接电网侧)流过100安培的电流,那么电流互感器二次侧(接电表侧)流过5安培的电流;但这里必须注意的是,电流互感器二次侧流过的最大允许电流为5安培。至于电能表在某一时间段的计数值为5.6时,实际电度值是多少?很简单5.6*(100/5)就可以了。引用公式P=UI,当U不变时,P=UI*(100/5)。问当该组合用于10kv线路计量和0.4kv线路计量时,就可以按上公式自己算了。以上回答纯属个人见解,如有错误,请指正!谢谢!

回答3:

电流互感器是将大电流转变为小电流的装置,100/5是指两侧的电流比值,即该互感器的一次侧加100A的电流时,二次的电流为5A,计算所测的实际电流时用二次的电流值乘20即为所侧电流的实际值,电能的计算用电流乘电压乘功率因数再乘时间就是

回答4:

100/5指的是电流互感器的变比...即未经互感器时如果电流为100经过之后引出电流则为5a...100即为电流互感器的额定电流....应该是功率吧电流乘电压乘变比就行了...没电表的参数你能算电量?

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