三相电表怎么选电流大小呢
三相电表怎么选电流大小呢，选择小了容易跳闸，选择大了又划不来，所以三相电表到底大小是怎么选的呢？
三相电表直通式最高可以做到100A，总线最大电流可以达到300A电流值，P=IU=300A*380V=114000W,直通三相电表最大可以承受的功率就是114000W，直通三相电表一般适用于商场、别墅、写字楼用表，这些地方一般用直通的应该够用了。
我们在选择三相电表的可以估算一下自己的设备一共有多少功率，才好选择三相电表的大小哦，三相直通式电表还有80A、60A、40A的哦，最高100A，如果您的设备功率已经超过了114000W，那么我们就要选择带互感器的三相电表了。
带互感器的三相电表电流规格一般为1.5(6)A、0.3(1.2)A，一般1.5(6)A用的比较多，这类三相电表只要互感器的倍数符合，是不受电流限制的，不限功率限制，适用于一般工厂或大中型工厂的车间、高压侧计量用户，应选择高压电能表，一般是三相三线制的、发电厂变电站计量用户。那么电流互感器的规格一般是怎么选择的呢?
电流互感器怎么选择
电流互感器一般是根据已知用电功率来计算，比如说，用电功率是100KW的用户，电压是220V/380V，电流应约等于100000除以660=150A，也就是说，用电功率除660，得到的就是电流的值，刚才计算是大约等于150A，但考虑到要预留一定的余量，需要选择200A的电流互感器，互感器的二次输出电流一般是5A，所以就选择200比5的互感器，关于电流互感器的精度，需要至少和电表处于同一个等级。
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