2. 100A in brackets is the maximum current value, which is the maximum current value that the electric energy meter can meet the requirements of accurate measurement. If the current connected to the meter exceeds this value, it will cause the loss of the meter, even burn the meter and cause safety accidents.
First of all, explain in detail:
1. Take the residential single-phase meter with accuracy level 2 as an example, and its initial measurement value is 0.005lb of basic current.
2. When the basic current is 5A, the initial metering value of current is 5A*0.005=25mA.
3. When the basic current is 10A, the current starting metering value is 10A*0.005=50mA.
4. That is to say, the smaller the basic current value outside the bracket, the higher the sensitivity of the watt-hour meter, not its load capacity.
Second, the working principle:
1. Smart meters are developing rapidly. Users of traditional smart meters use IC cards to pay money to the power supply department, and the power supply department uses the electricity sales management machine to write the purchase amount into the IC card. Users can turn on the power by swiping the contactless IC card in the induction area with the IC card. After the power supply is over, Kolor will leave. When the remaining power in the meter is equal to the alarm power.
2. Power failure alarm (or buzzer alarm), when the user swipes the card in the induction area, the power supply can be restored; When the remaining power is zero, the power will be cut off automatically, and the user must pay the card again to buy electricity before resuming power use.
3. The new smart meter realizes the power supply by banks and networks, and users can purchase electricity through the business windows of power companies, cooperative banks, third-party power sales agencies and networks, which greatly facilitates users.
Extended data:
Smart meter current range:
1, current specifications: 5(20)A, 5(30)A, 10(40)A, 20 (80) a.
2. rated voltage: AC220V V v.
3. Rated frequency: 50Hz.
4. Starting current: 0.4%Ib.
5. Power consumption: ≤1w.
Technical indicators:
1, accuracy grade: 1.0, basic error, starting and crawling meet the national standard requirements.
2. Current specification: 2.5 (10) a5 (20) a10 (40) a20 (80) a30 (120) a.
3. Meter constant: 1600imp/kWh 800imp/kWh.
4. Power consumption
5. Patented technology of contactless (RF) IC card: adopting the most advanced RF IC card and base station technology in the world, totally sealed and contactless, moisture-proof, waterproof, attack-proof, electricity-stealing-proof, antimagnetic and anti-jamming.
6. Data voting error correction technology: each data in the table is stored in five places. If the data is wrong, it can be corrected elsewhere, so that the data is absolutely reliable and foolproof.
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