Device that measures how much electricity is used in a power meter.But different environments for different units of electricity. Therefore, the types of electricity meters has become diverse.Now,let the editor introduce the classification of electricity meter.

Classification of electricity meter:

I.Specification: three phase three wire system, three phase four wire system, single phase system.

II.Wiring mode: via transformer access type and direct access type.

III.Measurement accuracy: 0.2S class   0.5S class   0.5 class   1.0 class   2.0 class. The Regulations on the Management of External Energy Supply of the Power metering Department requires that the electrometer accuracy of the external supply users shall not be less than level 1.0.

The unit of electricity is "kilowatt-hour" (kWh), commonly known as "degree".(For example: a rice cooker with 1000W220V, the rated voltage of the rice cooker is 220V and the rated power is 1000w. In the rated voltage of the electric appliance 220V, electricity for 1 hour, consume 1 degree of electricity, if 1 degree of electricity is 1 yuan, then the electricity bill of an hour is 1 yuan.) AC current refers to a current changing periodically between size and direction at any time.Its most basic form is the sinusoidal current, which is wavy. The standard frequency of AC power supply in China is stipulated to be 50 Hz. To reduce the loss of high voltage transmission, so the community incoming voltage is generally 10KV or 6KV, which is supplied by the high voltage power grid. Through high and low voltage distribution screen and low voltage transformer and distribution device, the high voltage power supply (generally 10kV or 6KV) into a low voltage power supply (three-phase 380V), power supply for lighting and other devices.

Generally, the low-voltage transmission mode is a three-phase four-wire system, using three phase lines plus zero line for power supply, the zero line by the neutral point of the transformer and grounding, the voltage is 380 / 220V, take any phase line plus zero line to form a 220V power supply line for general household use. The voltage between the phase lines in the line is called the line voltage. The voltage between the three phase lines is 380V, which is generally used by the motor.The voltage between the phase line and the zero line is called the phase voltage (220V) for household use.

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