Many people know that watt-hour meter is used to measure electrical energy, generally when using electricity will be installed meter for the measurement of electricity. It is convenient for power companies in the future of statistics and charges. But many people do not know what kind of working process the meter has. Here is a small introduction to the main working principle of the watt-hour meter.

I. What is the main working principle of the watt-hour meter?

1. Working principle of watt-hour meter:

When the watt-hour meter is connected to the circuit, the magnetic flux generated by the voltage and current coils passes through the disc, and these fluxes are in different phases in time and space, and eddy currents are induced on the disc respectively, Due to the interaction of magnetic flux and eddy current, the rotating torque is generated to make the disc rotate, and due to the braking effect of the magnet, the rotation speed of the disc reaches uniform motion. Since the magnetic flux is proportional to the voltage and current in the circuit, the disc moves at a speed proportional to the load current under the action of the disc. The number shown on the meter is the actual amount of electrical energy used in the circuit.

2. Basic principle of watt-hour meter:

Watt-hour meters use electronic circuits/chips to measure electrical energy; voltage signals are transformed into small signals for electronic measurement using voltage divider resistors or voltage transformers, The shunt or current transformer is used to turn the current signal into a small signal that can be used for electronic measurement, and a special power measurement chip is used to convert the voltage and current signals into analog or digital multiplication, and to total the power. Then the pulse signal with frequency proportional to the electric energy is output; the pulse signal drives the stepping motor to drive the mechanical meter to display or send it to the microcomputer for digital display after processing.

II. What should we pay attention to when using the watt-hour meter?

1. reasonable choice of watt-hour meter: one is to choose single-phase or three-phase meter according to the power consumption. For three-phase meter, should be based on the measured line is a three-phase three-wire system or three-phase four-wire system . Second, the rated voltage, current selection, must make the load voltage, current equal to or less than its rated value.

2. Installation of watt-hour meter: watt-hour meter is usually installed together with the distribution device, and the meter should be installed under the distribution device, and its center is 1.5~1.8 meters from the ground; When installing multiple meters side by side, the distance between the two meters should not be less than 200 mm; the electricity lines with different tariffs should be installed separately; the electricity lines with the same tariff should be combined and installed; When installing the meter, the meter body must be made vertical to the ground, otherwise it will affect its accuracy.

3. the correct wiring: according to the requirements of the manual and wiring diagram to the incoming and outgoing lines in order to the number connected to the meter outgoing head; wiring attention to the power supply phase sequence relationship, especially the reactive power meter should pay attention to the phase sequence; after the wiring is completed, we must repeatedly check the correct before closing the gate. 

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