Every household has electricity meters, which convert our electricity consumption into a numerical value and present it to us. Electricity meters on the market are mainly divided into single-phase electricity meters, three-phase electricity meters and so on. Did you know how the electricity meter is wired?  How to calculate the actual electricity consumption of electricity meter?  Now,let the editor introduce the "electricity meter wiring method, the actual consumption calculation method".

I. Wiring method of electricity meter  

For single-phase electricity meter, it has four wiring holes, respectively fire in fire out, zero in zero out, numbered from left to right are respectively ①, ②, ③, ④.  

That is to say, the live line and the neutral line of the power supply are respectively connected to the wiring holes (1) and (3) of the electricity meter as the incoming line, and the wiring holes (2) and (4) of the electricity meter are respectively connected to the outgoing line of the live line and the neutral line.  

This outlet is usually connected to the main switch of the line first, and then connected to various loads.  

In the past, induction meters were used and meter reading was recorded manually.  Now with the development of technology, smart meters are becoming more and more popular,  

Meter reading has also changed, generally through the way of background computer electricity transcription.  The communication of smart electricity meter is generally realized by connecting 485 lines.   

The wiring of three-phase meter is more complicated than that of single-wire meter, and the one with transformer is even more complicated.  Ordinary three - phase electricity meter than single - phase electricity meter more than two phases of fire in fire out.  

The ②, ⑤, ⑧ wiring holes of the mutual inductance three-phase electricity meter are respectively connected with the voltage input line, while the ①③, ④⑥, ⑦⑨ three pairs of wiring holes are respectively connected with the A, B, C three-phase current input line and outlet line.  

There is also one (sometimes two) is the wiring hole of the zero line, the section of the electric pressure line is generally smaller than the section of the current line. 

II. How to calculate the actual amount of electricity meter?  

1. The electricity meter without the transformer is directly connected to the line, and the actual electricity quantity can be read directly from the electricity meter. For example, when the power dial is marked with multiplier, The actual electricity consumption of this month is the actual consumption of this month (KW.h)=(monthly reading - monthly reading)× multiplier.  

2. Metering by electricity meter when connected by transformer:  

1) When the electricity meter is used with the current transformer, the actual electricity consumption of this month is the actual consumption of this month (KW.h)=(reading of this month - reading of last month)× current transformer ratio.   

2) When the power dial is marked with multiplier, the actual electricity consumption of this month is the actual consumption of this month (KW.h)=(monthly reading - monthly reading)× multiplier.   

3) When the electricity meter is used in conjunction with the voltage and current transformer, the actual electricity consumption of this month is the actual consumption of this month (KW. h)=(monthly reading - monthly reading)× current conversion ratio × voltage conversion ratio.   

4) When the power dial is equipped with multiplier and the voltage and current transformer are used together, the actual electricity consumption of this month is the actual consumption of this month (KW. h)=(monthly reading - monthly reading)× current ratio × voltage ratio × multiplier.  

5) The current ratio and voltage ratio are marked on the watt-hour meter, which is a complete set of meters.  If the variable current ratio is 100A/5A and the variable voltage ratio is 10000V/100V, It means that the current transformer equipped with the electricity meter should be 100A/5A and the voltage transformer should be 10000V/100V, so the reading of the electricity meter used in the whole set is the actual electricity consumption. There is no need to multiply the current ratio and pressure ratio.  

6) If the change ratio marked on the electric energy dial is inconsistent with the change of the voltage and current transformer, the actual electricity consumption of this month is the actual consumption of this month (KW.h)=(monthly reading - monthly reading)× (Transformer ratio x current ratio x multiplier/transformer ratio x current ratio marked on the dial).

The above is all the content of this article, if you want to know more about electric energy meters, please pay attention to this website!