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电能表接线方法,电能表实际用量计算方法

Release date: View count:460

     家家户户都存在着电能表,将我们的用电量转化成数值呈现给我们,市面上的电能表主要分为单相电能表、三相电能表等,你有了解过电能表的接线方式吗?电能表实际用电量怎样计算?今天小编详细介绍下电能表接线方法,实际用量计算方法。

  一、电能表接线方法

  对于单相电表,它有四个接线孔,分别是火进火出、零进零出,编号从左到右分别是①、②、③、④。

  也就是说电源火线和零线分别接到电能表的①、③接线孔作为进线,而电表的②、④接线孔分别接火线和零线的出线,这个出线一般会先接到线路的总开关,然后再分接各种各样的负载。

  以前一般都是感应式电能表,抄表也是以人工的方式进行记录。现在随着科技的发展,智能电表的普及也越发广泛,抄表方式也发生了变化,一般都是通过后台计算机的方式进行电度的抄录。而智能电表的通信一般是通过接485线来实现。

  三相电表的接线相对于单线电表而言较为复杂,有互感器的就更为复杂了。普通三相电表也就比单相电表多出两相的火进火出。

  互感式三相电能表的②、⑤、⑧接线孔分别接电压进线,而①③、④⑥、⑦⑨三对接线孔分别接A、B、C三相的电流进线和出线,还有一个(有时候是两个)就是零线的接线孔了,电压线截面一般比电流线截面小一些。

    电能表接线方法,实际用量计算方法

    二、电能表实际用量怎样计算?

  1. 不经互感器的电能表即直接接入线路,从电能表直接读得实际电度数,如电能表盘上注有倍率时,本月实际用电量为本月实际用量(kW·h)=(本月读数-上月读数)×倍率。

  2. 经互感器接入时电能表计量:

  1) 电能表与电流互感器配合使用时,本月实际用电量为本月实际用量(kW·h)=(本月读数-上月读数)×变流比。

  2) 电能表盘上注有倍率时,本月实际用电量为本月实际用量(kW·h)=(本月读数-上月读数)×倍率。

  3) 电能表与电压、电流互感器配合使用时,本月实际用电量为本月实际用量(kW·h)=(本月读数-上月读数)×变流比×变压比。

  4) 电能表盘上注有倍率与电压、电流互感器配合使用时,本月实际用电量为本月实际用量(kW·h)=(本月读数-上月读数)×变流比×变压比×倍率。

  5) 电能表上注明电流比值和电压比值,这是成套表计。如注明变流比为100A/5A,变压比为10000V/100V,是指电能表所配备的电流互感器应为100A/5A,电压互感器应为10000V/100V,所以成套配用的电能表的读数就是实际用电,不需再乘变流比、变压比。

  6) 如果电能表盘上标注的变比与电压、电流互感器的变化不符时,本月实际用电量为本月实际用量(kW·h)=(本月读数-上月读数)×(所配互感器变压比×变流比×倍率/表盘上标注的变压比×变流比)。

  以上就是关于电能表接线方法,实际用量计算方法详细介绍,如果您还有其他问题,可以随时咨询我们。

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