How to connect three-phase meter
Three-phase metering equipment is a common electrical energy metering device in industrial, commercial and high-power household circuits. Correct wiring can not only ensure accurate metering, but also ensure the safety of electricity use. The following is a detailed guide on wiring of three-phase meters, which is compiled in combination with relevant technical discussions in recent hot topics (such as new energy policies, smart meter promotion, etc.).
1. Preparation work before wiring of three-phase meter
1.Confirm the meter type: Common three-phase meters are divided into direct type and transformer type, and they need to be selected according to the current size.
2.Inspection tools and materials: Screwdriver, insulation tape, cables, etc.
3.Power off operation: The power supply must be cut off before wiring to avoid the risk of electric shock.
Second and third-phase meter wiring steps (taking direct formula as an example)
| Terminals | Corresponding route | Color logo |
|---|---|---|
| 1, 4, 7 | Three-phase live wire (L1, L2, L3) | Yellow, green, red |
| 2, 5, 8 | Three-phase load out | Same line of fire color |
| 3, 6, 9 | Neutral line (N) | blue |
| 10 | Ground wire (PE) | Yellow and green two colors |
3. Precautions and common issues
1.The line order cannot be confused: Misconnection may lead to inaccurate metering or damage to the equipment.
2.Transformer wiring: If the current exceeds 100A, it needs to be equipped with a current transformer, and the secondary side wiring must be reliable grounded.
3.Recent hot topics: With the popularity of photovoltaic power generation, three-phase meters need to support bidirectional metering (such as connecting to the inverter output).
4. Popular technology trends (discussed online in the past 10 days)
| Hot Topics | Related content |
|---|---|
| Smart meter upgrade | Many places promote remote meter reading of 4G/NB-IoT, and communication module interfaces must be reserved for wiring. |
| New energy vehicle charging pile | High-power charging pile requires three-phase meter to have anti-countercurrent function |
| New national standard for energy efficiency | The new regulations in 2024 require the error rate of three-phase meter ≤0.5% |
V. Safety Specifications
1. After wiring, the exposed conductor must be wrapped with insulating tape.
2. Use a multimeter to detect the line is on and off before powering on for the first time.
3. It is recommended that licensed electricians operate, and some regions (such as Jiangsu and Guangdong) have included this in the focus of production safety inspections.
Summarize: The wiring of three-phase meter must strictly follow the specifications and adjust the installation plan in combination with the latest technical trends (such as smart meter and new energy access). If you are not sure about the operation steps, you can refer to the "Three-phase Smart Electric Energy Meter Installation Specifications" (2023 Edition) issued by State Grid.
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