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Smart Wattmeter Parameters And Applications
- May 01, 2018 -

Energy meter parameters and applications Meters are meters that measure how much electrical energy is consumed in a circuit. To understand some of the technical parameters of the meter is conducive to the selection and correct use of the meter. First, the main parameters of the meter and its significance Voltage parameters: indicates the voltage of the power supply. The single-phase voltage of low-voltage working circuit in our country is 220V, and the three-phase voltage is 380V. Calibration 220V meter is suitable for single-phase ordinary lighting circuit. Calibration 380V meter is suitable for industrial and agricultural production circuit using three-phase power supply. Current parameters: There are two current parameters in the general ammeter. For example, 10(20)A, one is the rated working current Ib(10A) reflecting the measurement accuracy and starting current index, and the other is the two values of the maximum current Imax(20A) allowed to pass when meeting the requirements of the measurement standard. If the current in the circuit exceeds the maximum allowable current Imax, the meter will be inaccurate or even damaged. Power Frequency: Indicates the frequency of the applicable power supply. The frequency of the power supply indicates the number of times the direction of the alternating current changes within 1 s. The frequency of AC power in China is set at 50Hz. The direction of the alternating current changes, and the speed of this change is very important for demanding precision instruments (such as X-ray machines, etc.), and negligible impact on the use of electrical appliances such as lighting or electric heaters that do not require a high frequency of the power supply. . Power metering parameters: different power meters, different expressions. The metering parameter of the turntable induction system power meter is xxxr/kWh, which means that for every 1kWh of electrical energy consumed by the electrical appliance, the aluminum turntable of the power meter must turn xxx turn. The metering parameter of the electronic energy meter is marked with xxximp/kWh, which means that for every 1 kWh of electrical energy consumed by the electrical appliance, the electrical energy meter pulse count produces xxx pulses. In addition, the energy meter also has parameters such as operating environment temperature, humidity parameters, and accuracy class. Second, the application of energy meter parameters The voltage parameter of the energy meter is selected according to the operating voltage of the electrical appliance. If the electrical consumers in the circuit are all 220V power supplies, use a power meter with a calibration voltage of 220V. Otherwise, use a power meter with a calibration voltage of 380V. 2. The choice of current parameters depends on the size of the circuit load. The load of the circuit can be calculated based on the total power of the appliances in the circuit (I=P total/U). With the continuous improvement of living standards, the number of household appliances, especially high-power household appliances, is increasing. When selecting the current parameters of the electric energy meter, there should be room for surplus so that the normal use of electric appliances can be continued in the future. 3. Use the metering parameters of the energy meter to measure the actual power of the appliance. Taking the measurement parameters of the inductive power meter as an example, the actual power is measured. The metering parameter xxxr/kWh means that for every 1 kWh of electrical energy consumed by the appliance, the aluminum turntable of the energy meter must turn xxx turn. Turn off the other electrical appliances in the circuit and let only the electrical appliances under test work. Take the time t when the aluminum dial rotates through the number of revolutions n (to ensure accuracy, generally n takes 20 = 30). The power consumed in time t is nkWh/xxx. According to P = W / t can get the power size, P = W / t = nkWh / xxxt. It should be pointed out that the unit must be unified. If the power is in kWh, the unit of time is h; if the power is in J, the time unit is s.

Zhejiang Reallin Electron. Co., Ltd

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