Characteristics and advantages of electronic watt hour meter

Characteristic:
① Powerful and easy to expand
An electronic energy meter is equivalent to several inductive energy meters. For example, an electronic multi-function meter with comprehensive functions is equivalent to two positive active meters, two positive reactive meters, two maximum demand meters and one loss of voltage timer. It can also realize the functions of time sharing measurement and automatic data reading that these seven meters cannot achieve. 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 whole metering device.
② High accuracy and stability
The accuracy level of induction watt hour meter is generally 0.5-3.0, and the error is easy to change due to mechanical wear. The electronic watt hour meter can easily use various compensations to reach a higher accuracy level, and the error stability is good. The accuracy level of electronic watt hour meter is generally 0.2-1.0.
③ Small starting current and smooth error curve
Induction meters can only be started and measured at 0.3% IB, and the error curve changes greatly, especially at low load; while electronic meters are very sensitive, they can start and measure at 0.1% 1b, and the error curve is good, and the error is almost a straight line within the full load range.
④ Wide frequency response range
The frequency response range of induction meter is generally 45-55Hz, while that of electronic multi-function meter is 40-1000hz.
⑤ Little affected by external magnetic field
Induction meter is based on the principle of moving in magnetic field, so the external magnetic field has a great influence on the meter performance. The electronic watt hour meter mainly relies on multiplier, and its measurement performance is little affected by the external magnetic field.
⑥ Easy to install and use
There are strict requirements for the installation of induction energy meter. If the suspension horizontal inclination deviation is large, or even obviously inclined, it will cause inaccurate electric energy measurement. The electronic watt hour meter adopts the electronic measurement method, without mechanical rotating parts, so there is no such problem. In addition, it is small in volume, light in weight and easy to use.
⑦ Large overload capacity
Induction meters work with coils. In order to ensure the accuracy of measurement, they can only overload 4 times, while electronic multi-function meters can overload 6-10 times.
⑧ Stronger anti stealing ability
Stealing electricity is an unavoidable problem in urban and rural power consumption in China, and the ability of preventing stealing electricity of induction watt hour meter is poor. The new electronic energy meter can prevent the common electricity stealing behavior from the basic principle. For example, ADE7755 can measure the phase line and zero line current respectively through two current transformers, and take the large current as the basis of electric energy measurement, so as to realize the power stealing mode of preventing short circuit current wire, etc.
Advantage
Compared with mechanical energy meter, electronic energy meter has obvious advantages. For example, it has strong anti stealing ability, high measurement accuracy, good load characteristics, straight error curve, strong power factor compensation performance, low power consumption, especially its measurement parameter flexibility and derivative functions. Due to the application of single-chip microcomputer to inject new vitality into the electric energy meter, these are difficult to do for the general mechanical meter. But the early electronic watt hour meter also has some obvious shortcomings, such as short working life, easy to be interfered by the outside world, and less reliable than mechanical watt hour meter.

Source: Baidu Encyclopedia https://baike.baidu.com/item/%E7%94%B5%E5%AD%90%E5%BC%8F%E7%94%B5%E8%83%BD%E8%A1%A8/5567989