How To Wire A Single-Phase Meter？
Do you know how to wire a household electric meter? A single-phase meter is a device used to measure the power consumption in ordinary household circuits, which are used to supply power to various household appliances. Single-phase electricity meters have the characteristics of low energy consumption and high reliability. Now, let's learn about the wiring method of household single-phase electricity meter.
The single-phase active watt-hour meter consists of terminals, current coils, voltage coils, metering turntables, and counters. As long as the current coil passes current and the voltage coil is applied with voltage, the turntable is rotated by electromagnetic force. The single-phase watt-hour meter has a total of 5 terminals, two of which are short-circuited with connecting pieces inside the meter. Therefore, the single-phase watt-hour meter has only 4 external terminals, namely terminals 1, 2, 3, and 4. Due to the different models of watt-hour meters, each type of watt-hour meter has a wiring diagram of 4 terminals in the lead-sealed cover.
Direct access method:
If the power of the load is within the allowable range of the watt-hour meter, that is, the current flowing through the current coil of the watt-hour meter will not cause the coil to burn, then the direct access method is used.
The single-phase watt-hour meter has four terminals, numbered 1, 2, 3, and 4 from left to right.
There are generally two types of wiring: 1 and 3 are connected to the incoming line, and 2 and 4 are connected to the outgoing line; the other is to connect the incoming line according to 1 and 2, and 3 and 4 to connect the outgoing line. Regardless of the connection method, the phase wire (live wire) must be connected to the terminals of the current coil of the meter. Due to the special wiring of some electric meters, the specific wiring method needs to be connected according to the wiring diagram on the terminal cover.
Access method via transformer:
When using a single-phase watt-hour meter to measure the power consumption of a single-phase circuit with a large current, a current transformer should be used for current conversion, and the current transformer should be connected to the current coil of the watt-hour meter. There are two connection methods:
(1) Connection method when terminals 5 and 1 in the single-phase watt-hour meter are not disconnected.
Since the shorting piece in the meter is not disconnected, the K2 terminal of the transformer is prohibited from being grounded.
(2) The connection method when the 5 and 1 terminals of the single-phase watt-hour meter are disconnected.
Since the shorting piece in the table has been disconnected, the K2 terminal of the transformer should be grounded. At the same time, the voltage coil should be connected to both ends of the power supply.
The above is the connection method of the electric meter, as well as the wiring diagram of the household electric meter. The editor reminds everyone to pay attention to safety when wiring household meters.
