Brief Introduction To The Characteristics Of Electronic Energy Meter
Electronic energy meter is through the user power supply voltage and current real-time sampling, the use of a dedicated energy meter integrated circuit, the sampling voltage and current signal processing and multiplication into a pulse proportional to the power output, through the counter or digital The display shows the physical instrument.
① powerful, easy to expand
An electronic energy meter is equivalent to a few induction energy meter, such as a full-featured electronic multi-function table is equivalent to two positive active table, two positive reactive table, two maximum demand table and a Only the pressure meter, and can achieve the seven tables can not be achieved by time measurement, data automatically read and other functions. At the same time, the reduction of the number of meters, effectively reducing the secondary circuit pressure drop, improve the reliability of the entire measurement device and accuracy.
② high accuracy and stability
Induction type energy meter accuracy level is generally 0.5 ~ 3.0 level, and because of mechanical wear, the error is easy to change, and electronic energy meter can easily use a variety of compensation to easily achieve a higher accuracy level, and the error stability Good, electronic energy meter accuracy level is generally 0.2 to 1.0 level.
③ start current is small and the error curve is flat
Inductive power meter to start and measure at 0.3% Ib, the error curve changes greatly, especially in the low load error; and electronic energy meter is very sensitive, in 0.1% 1b can start and start Measurement, and the error curve is good, in the full load range error is almost a straight line.
④ wide frequency response range
Inductive energy meter frequency response range is generally 45 ~ 55Hz, and electronic multi-function table frequency response range of 40 ~ 1000Hz.
⑤ by the external magnetic field is small
Induction energy meter is based on the principle of moving into the magnetic field of measurement, so the external magnetic field on the measurement of the measurement performance of a great impact. The electronic energy meter mainly rely on the multiplier to operate, the measurement performance by the external magnetic field is small.
⑥ easy to install and use
Induction type energy meter installation has strict requirements, if the suspension level deviation deviation, or even obvious tilt, will result in energy measurement are not allowed. The electronic energy meter is used in electronic measurement, no mechanical rotating parts, so there is no such problem, while its small size, light weight, easy to use.
⑦ overload capacity
Induction of the energy meter is to use the coil to work, in order to ensure its measurement accuracy, generally only 4 times overload; and electronic multi-function table can reach an overload of 6 to 10 times.
⑧ anti-tampering ability
Stealing electricity is an unavoidable reality in China's urban and rural electricity, and the anti-tampering ability of induction type energy meter is poor. The new electronic watt-hour meter from the basic principle to achieve the prevention of common tampering behavior. For example, ADE7755 through two current transformers were measured phase line, zero line current, and the large current as a basis for energy measurement, so as to prevent short-circuit current wire and other ways to steal.