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An electronic energy meter is equivalent to several inductive energy meters, for example, a fully functional electronic multi-function meter is equivalent to two positive active meters, two positive reactive meters, two maximum demand meters and one It is only a pressure loss chronograph, and can realize the functions of time-sharing measurement and automatic data reading that cannot be achieved by these seven watches. At the same time, the reduction of the number of meters effectively reduces the pressure drop of the secondary circuit and improves the reliability and accuracy of the entire metering device. The accuracy class of the inductive energy meter is generally 0.5 to 3.0, and due to mechanical wear, the error is easy to change, while the electronic energy meter can easily use various compensation to easily achieve a higher accuracy class, and the error is stable The accuracy of the electronic energy meter is generally。The inductive electric energy meter can only be started and measured at 0.3 %Ib, and the error profile changes greatly, especially at low load. Measurement, and the error profile is good, the error is almost a straight line in the full load range. The inductive electric energy meter is measured according to the principle of moving into the magnetic field, so the external magnetic field has a great influence on the measurement performance of the meter. The electronic energy meter mainly relies on the multiplier for operation, and its measurement performance is less affected by the external magnetic field.
There are single phase MID electric energy meter strict requirements for the installation of inductive electric energy meters. If the horizontal inclination deviation of the suspension is large, or even obviously inclined, the electric energy measurement will be inaccurate. The electronic energy meter adopts an electronic measurement method without mechanical rotating parts, so there is no above-mentioned problem. In addition, it is small in size, light in weight, and easy to use. Inductive electric energy meters work with coils. In order to ensure their measurement accuracy, they can only be overloaded by 4 times; and electronic multi-function meters can be overloaded by 6 to 10 times.
Electricity tamper is an unavoidable practical problem in urban and rural electricity consumption in my country. The new electronic watt-hour meter can prevent common electricity tamper from the basic principle. For example, the ADE7755 can measure the phase line and neutral line current through two current transformers respectively, and use the large current as the basis for electric energy measurement, thereby realizing the way of preventing electricity tamper such as short-circuit current wires.
