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Single-phase electric meter wiring diagram _ three-phase three-wire electric energy meter wiring diagram _ three-phase four-wire electric meter physical wiring diagram
When it comes to electric meter wiring, there are numerous configurations available, ranging from single-phase to three-phase systems. These can either be directly wired or connected through current transformers and voltage transformers. Generally speaking, most electric meters have just two main circuits: the voltage loop and the current loop. The basic rule for wiring an electric meter is that the current coil is connected in series with the load or linked to the secondary side of a current transformer. Meanwhile, the voltage coil should be connected in parallel with the load or attached to the secondary side of a voltage transformer. Today, we’ll walk electricians through the wiring diagrams and methods for three-phase electricity meters, hoping this helps enhance your knowledge in power technology.
Let’s start with the single-phase electric meter wiring diagram. Wiring a single-phase meter is fairly simple. In low-voltage and small-current circuits, the meter can be directly connected to the line, as illustrated in Figure (A). The meter's end cover—marked by the numbered boxes 1, 2, 3, and 4 in the figure—is accompanied by a wiring diagram. For low-voltage but high-current lines, the current coil of the meter is connected to the load via a current transformer, as shown in Figure (B). This is commonly seen in domestic DD862 series single-phase electric meters.
Moving on to the three-phase meters, there are two main types: the three-phase three-wire active energy meter and the three-phase four-wire active energy meter. Let’s break them down individually.
The three-phase three-wire active energy meter, often referred to as a mechanical meter, comprises two driving parts, with two aluminum discs mounted on a single rotating shaft, known as a two-element meter. It features eight external terminals, and its wiring diagram is provided in the accompanying image, where (a) represents direct access, and (b) shows the wiring method through current transformer access.
Next up is the three-phase four-wire active energy meter, which consists of three drive components, referred to as a three-element meter. One key distinction between this and single-phase or three-phase three-wire meters is the presence of 11 terminals. This meter is frequently used in power and lighting circuits. Here’s the wiring diagram:
The left image illustrates a directly connected three-phase four-wire active power meter. Live wires U, V, and W are connected to terminals 1, 4, and 7, respectively. Terminals 3, 6, and 9 are then connected to the load, while the neutral line connects to terminals 10 and 11, completing the load circuit.
The right image depicts a three-phase four-wire active meter connected through a current transformer. Live wires U, V, and W are connected to the primary side L1 of the current transformer, with the L2 end connected to the load. Terminal 7 is linked to the secondary side K1 of the current transformer, while terminals 3, 6, and 9 are connected to the secondary side K2.
Terminals 2, 5, and 8 of the meter are connected to the L1 end of the primary side of the current transformer, and the connecting pieces must be removed for safety reasons. To ensure safety, the secondary side K2 of the current transformer should be grounded separately. Below is a simulated wiring diagram to guide you through the process. Pay close attention to the wiring of the current transformer and the meter.
This overview provides a comprehensive look at different electric meter wiring configurations. Whether you're working with single-phase or three-phase meters, understanding these principles ensures safe and efficient operations. If you encounter any challenges or need further clarification, feel free to reach out!