What do you think of old electric meters?

152.2 kWh, if the number box is red, it means decimal, and black means integer. ?

The number is displayed as: 0000.0 degrees, the first four digits are degrees, and the last digit is zero degrees after the decimal point, which can be ignored. The first five digits of single-phase watt-hour meter are integers, and the last digits in different color boxes are decimals. When the electric power department reads meters, only integers are recorded, excluding decimals, and the last grid number is used as the next base and stored in the electric energy meter.

There are four ways to check the electricity meter:

1. Generally, straight-ahead single-phase and three-phase meters can directly read numbers, and the last reading is subtracted, which is the electricity consumption at this stage. The incoming line of the straight line meter is relatively thick, and it is not connected with a transformer after careful observation.

2. The three-phase ammeter is connected through a current transformer. There are 65,438+00 wires connected to the ammeter. It is necessary to observe the current ratio of the connected current transformer, which is listed on the nameplate of the current transformer. Are marked with a number ratio of 5, such as 100/5 150/5. The number read on the ammeter multiplied by the current ratio is the measured electric quantity, and the accurate number should be added.

3. Electricity meter view: A single-phase electricity meter measures the electricity quantity of three-phase electricity, and the electricity quantity reading method is to directly connect the electricity meter to read the number on the electricity meter multiplied by 3. If the meter is connected through a transformer, you need to read the number of the meter multiplied by the current multiple of the transformer and then multiplied by 3.

4. Smart meters have only one LCD screen. If it is single phase, the total power and residual power will be displayed directly, which can be read directly. If it is an IC card table, only the LED display is a single display card table. There will be a little red dot on the instrument. The red dot will be used all the time when jumping to general use, and it will be left when jumping to rest. Dual-card meter can go up and down, three-phase prepayment meter can read directly, and mutual inductance meter can read multiplied by transformer ratio.