Single-phase electric meter wiring diagram _ three-phase three-wire electric energy meter wiring diagram _ three-phase four-wire electric meter physical wiring diagram

There are many types of wiring in the electric meter. There are single-phase electric meter connection and three-phase electric meter connection. There are direct wiring type, and there are also wiring through current transformer and voltage transformer. But in general, there are only two circuits: the voltage loop and the current loop. The general principle of electric meter wiring is: the current coil is connected in series with the load, or connected to the secondary side of the current transformer, the voltage coil is connected in parallel with the load or connected to the secondary side of the voltage transformer, and today it is brought to the electrician friends. To the three-phase electricity meter wiring diagram and method, I hope to help you in power technology.

The wiring of single-phase meters is relatively straightforward. In the low voltage and small current lines, the meter can be directly connected to the line, as shown in Figure (A). The meter end cover (that is, the row of boxes marked 1, 2, 3, 4 in the figure) is drawn with a wiring diagram. For the line in the low voltage and high current, the current coil of the meter is connected to the load via the current transformer, such as Figure (B) shows. Domestic DD862 series single-phase electric meter.

The three-phase electric meter has three-phase three-wire active electric meter and three-phase four-wire active electric meter. The following one-to-one explanation

The three-phase three-wire active electric meter (mechanical watch) consists of two driving parts, and the two aluminum discs are fixed on one rotating shaft, which is called a two-element electric meter. There are 8 terminals externally. The wiring diagram is shown in the right figure, (a) is direct access, and (b) is the wiring method through the current transformer access;

The three-phase four-wire active meter consists of three drive components, called the three-element meter, and the biggest difference between the single-phase and three-phase three-wire meters is that there are 11 such terminals. This meter is often used in power and lighting. Power supply circuit. The wiring diagram is as follows:

The above picture (left) is directly connected to the three-phase four-wire active power meter. The live wires U, V, and W are connected to the 1, 4, and 7 terminals respectively. The 3, 6, and 9 terminals are connected to the load, and the neutral line is connected to the 10th terminal and the 11th. Terminate the other end of the load.

The above picture (right) is a three-phase four-wire active meter connected via a current transformer. The live wires U, V, and W are respectively connected to the primary side L1 of the current transformer, and the L2 end of the primary side is connected to the load. The 7th end is connected to the secondary side K1 of the secondary side of the current transformer, and the 3, 6, and 9 ends are respectively connected to the secondary side end K2.

The terminals of the electric meters 2, 5 and 8 are respectively connected to the L1 end of the primary side of the current transformer, and the contiguous pieces should be removed. To ensure safety, the secondary side end K2 of the current transformer should be grounded separately. The following figure shows the simulation of the wiring diagram. Pay attention to the wiring of the current transformer and the meter.