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Comparison of mechanical watt-hour meters and electronic watt-hour meters

1. Stability
Because the electronic watch uses high-stability materials such as manganese copper to make current sampling components, and high-quality circuits as calculation processing components, the overall stability is very good. Users can achieve adjustment-free before installation, and the adjustment cycle during work can also be Greatly extended, thus saving labor.
Because mechanical watches work in a mechanical rotation mode, the friction is unstable, so the stability is poorer than electronic watches, and the accuracy may be worse after transportation, and must be re-calibrated before installation. The stability of the watch after installation and operation will gradually deteriorate due to the above reasons.
2. Accuracy
The accuracy of the A/D analog-to-digital converter in the electronic meter circuit can reach more than 2-14, so the resolution and precision are very high, and the high-precision electric energy meter of 0.5 level or more can be designed. Therefore, the measurement accuracy in power grid management can be greatly improved, and the line loss statistics can also be more accurate.
Due to the magnetic circuit structure, the mechanical watch has large nonlinear distortion and poor consistency, so various compensation mechanisms are used. The use of compensation mechanisms reduces the stability and is not conducive to the adjustment in production and use. Therefore, it is necessary to produce high-precision mechanical electrical energy. The difficulty of the table is quite large.
3. Sensitivity
The electronic circuit of the electronic watch is extremely sensitive, which can be an order of magnitude higher than that of the mechanical watch, and it can maintain this high sensitivity for a long time.
The mechanical friction resistance of a mechanical watch is a principle problem that cannot be overcome at present, especially at low speeds, the mechanical friction is close to the static friction, and the value is significantly increased, so the metering loopholes will increase, especially after long hours of work.
4. Linear dynamic range and measurement accuracy
Due to the good linearity of the sampling components, A/D conversion components, and amplifying circuits of the electronic watch, the electronic watch has a large linear dynamic range and strong adaptability. It is especially suitable for places with large changes in power consumption and can ensure large and small currents. Hour measurement accuracy remains unchanged.
The linear dynamic range of a mechanical watch is small. The reason is that there are too many nonlinear factors. For example, when the current is low and the speed is low, it is subject to the increase of friction and magnetic resistance. When the current is large, the magnetic circuit is prone to magnetic circuit saturation. When it is very large, the measurement accuracy will be greatly affected.
5. Power consumption
Due to the CMOS components used in the electronic watch, its own power consumption is very small. For example, the monthly power consumption of a single-phase electronic watch is about 0.3 to 0.5 kW·h.
The power consumption of mechanical watches is about 0.8-1kW·h per month. Don’t underestimate the difference of about 0.5kW·h. For a large power grid with hundreds of thousands or even millions of electric energy meters, the total number is very large, which has an energy-saving effect on the grid and the management cost of the grid. The impact is huge.electronic energy meter manufacturers
6. Anti-stealing effect
Since the internal design of the electronic circuit is easy to implement preventive measures against various electric theft behaviors, the electronic watch is much stronger than the mechanical watch in the anti-theft function.