① Load power: bai below 30KW (main load type: electric light, low power du rate air conditioner). zhi

Application: Facade or hand workshop dao.

Applicable power meter type: three-phase active energy meter (function requirement: active power metering), accuracy level 1

Description of functional requirements: The reactive power loss is small, and a simple active energy meter can be used.

② Load power: 30-60KW (main load type: electric lamp, electric heating equipment).

Application: facade or hand workshop.

Applicable power meter type: three-phase active energy meter (function requirement: active power metering), accuracy level 1

Description of functional requirements: There is no reactive loss, and a simple active energy meter can be used.

③ Load power: 30-60KW (main load type: electric light, low-power air conditioner, electric heating equipment).

Application occasions: facade or hand workshop, workshop.

Applicable energy meter type: three-phase active energy meter or three-phase active and reactive energy meter (function requirements: active and reactive power measurement, reactive power measurement is included in the positive power), accuracy level 1

Description of functional requirements: The total active power is not large, and active energy meters or active and reactive combined energy meters can be used.


Three-phase four-wire watt-hour meters have rated currents of 5, 10, 25, 40 and 80A. The maximum rated current allowed to pass for a long time can generally be 1.5 times the rated current.

Pay attention to the rated current and rated voltage when selecting the watt-hour meter. The rated current of the watt-hour meter should be greater than or equal to the calculated current of the line, otherwise the accuracy will be lower and the life will be shortened.

The watt-hour meter is also not allowed to be used in circuits where the load is often below 5% of the rated value, because it cannot correctly measure the power consumed.

When the rated current of the existing energy meter cannot meet the large current of the line, the current should be changed to a small current of less than 5A through a current transformer of a certain current ratio, and then connected to the 5A meter. When calculating the power consumption, the power consumption of the 5A wattmeter is multiplied by the current ratio of the selected current transformer, which is the actual power consumption.


Zhejiang Tepsung Electric Meter Co., Ltd . is a professional China manufacturer and supplier of three phase meter and Electromechanical KWh Meter . The three-phase electronic watt-hour meter uses a large integrated circuit, which is easy to operate and efficient. The measurement accuracy and accuracy of the instrument strictly abide by the national standards. New energy, energy distribution, big data and energy value-added services are our core businesses. Welcome to consult and purchase: https://www.yhddb.com/