Zhejiang Tianpusheng Electric Co., Ltd. is one of the largest manufacturers of electric energy meters in Taizhou City, Zhejiang Province, China. One of the products we promote is the single phase meter. Let's briefly introduce the single phase electric energy meter.
Single-phase electric energy meter wiring method: There are two ways to connect the meter: jump-in connection and direct plug-in connection; the two wiring methods are different in general, and the internal principle is the same, that is, the current coil of the ammeter is inserted into the load circuit, and the voltage coil is connected to the load circuit. The load is connected in parallel, "the energy of the two coils should be connected." The polarity of the power supply is the same. Generally, single-phase electric energy meters have special junction boxes. When the lid is opened, there are four terminal buttons. Which method is used for actual wiring should be carried out in accordance with the regulations in the instrument specification. In low voltage, low current, single-phase circuits, the meter can be directly connected to the line. If the load current is high or the voltage is high, the transformer should be connected to the circuit. At this time, the primary side of the current transformer is connected in series with the load, the secondary is connected in series with the current coil of the electric energy meter, the primary of the voltage transformer is connected in parallel with the load, and the secondary is connected in parallel with the voltage coil of the electric energy meter.
Description 1. Reasonable selection of electric meters: First, select single-phase or three-phase electric meters according to the task. For a three-phase electric energy meter, it should be selected according to whether the line to be tested is a three-phase three-wire system or a three-phase four-wire system. Secondly, the selection of rated voltage and current must make the load voltage and current equal to or less than its rated value. 2. Electric meter device: The electric meter is usually equipped with a power distribution device. The meter should be installed under the power distribution device, and its center is 1.5 to 1.8 meters from the ground; when the parallel device is more than one meter, the distance between two meters should not be less than 200 mm; different electricity prices The power line should be separately loaded; the power line of the same price should be combined with the meter; when installing the meter, the body should be perpendicular to the ground, otherwise it will affect its accuracy. degree. 3. Correct wiring: According to the requirements of the manual and wiring diagram, the input and output wires should be connected to the outlet of the instrument. Wiring should pay attention to the phase sequence of the power supply, especially the reactive power meter. Phase sequence; after the wiring is completed, the correctness must be checked before it can be closed.
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