What Are The Differences Between A Three-Phase Meter And A Single-Phase Meter? What Are The Precautions For Wiring?

At present, electricity meters are mainly divided into two categories, one is single-phase electricity meters and the other is three-phase electricity meters. Their functions and scope of use are somewhat different. As a terminal of intelligent equipment, electricity meters have penetrated into all aspects of our lives, so how to select and connect electricity meters? Let me introduce the differences between three-phase electricity meters and single-phase electricity meters? What are the precautions for wiring?

1. What are the differences between a three-phase meter and a single-phase meter?

1. There are differences in function

Single-phase meters generally intelligently measure active power or reverse active power, and their functions are relatively simple compared to three-phase meters.

In addition to measuring active electricity, three-phase electricity meters can also measure reactive electricity, and the functions are convenient. Three-phase electricity meters are much more complicated than single-phase electricity meters.

2. Different scope of application

Three-phase electricity meters are generally used in places where the current is relatively large, such as factories, government buildings, villas, shops, etc. The demand for these electricity is relatively large, so the three-phase electricity meter is the best choice. The three-phase meter can also be used with a transformer, so the three-phase meter with a transformer does not have a maximum current value, and as long as the transformer has a sufficient transformation ratio, it is possible.

Although single-phase meters can also be used as mutual inductance, most single-phase meters are direct-entry, which are only suitable for rental houses, hotel apartments, etc. Direct-entry electric meters also have requirements for the maximum current. If the maximum current is exceeded, the meter will be burned out.

2. What are the precautions for wiring?

Whether it is a three-mutual inductance meter or a single-mutual inductance meter, the following points must be paid attention to when wiring:

S1 must be connected to 1, S2 to 3, and cannot be reversed; otherwise, the meter will be reversed

The live wire must be penetrated from the P1 side of the transformer and out from the P2 side; otherwise, the meter will reverse.

The state requires that the wires connecting S1 and S2 must use copper wires of more than 2.5 square meters

In order to prevent the high voltage generated by the open circuit of the current transformer, the current transformer S1 or S2 must be grounded, generally connected to the ground bar of the distribution box or connected to the ground wire.