Three-phase electricity meters are divided into three-phase three-wire electricity meters and three-phase four-wire electricity meters. There are two main connection modes: direct access mode and transformer access mode. The wiring principle of a three-phase meter is generally as follows: the current coil is connected in series with the load, or at the secondary side of the current transformer, and the voltage coil is connected in parallel with the load or at the secondary side of the voltage transformer.
Direct access type, also known as straight-through type wiring, can be directly connected within the allowable range of the load function meter, that is,if the current specification of the meter can meet the needs of users, you can use this method.
When the parameters of the three-phase meter (voltage and current limit) are not compatible with the parameters of the required measuring circuit (voltage and current value), that is, the current and voltage of the three-phase meter cannot meet the standard of the required measuring meter, it is necessary to access through the transformer.
Post time: Jan-15-2021