Things you didn't know about electricity meters

In this day and age, you may not have a watch, but your home must have an electricity meter. ​The electricity meter, as a measuring instrument related to people's livelihood, is an essential tool for electricity metering and electricity bill settlement.

Have you looked closely at your own electricity meter? Does your home use a traditional mechanical meter or a smart meter? Do you have any questions about electricity meters? Next, Xiaobian to roughly summarize some common sense problems of electricity meters.

1, from the outside of the electricity meter, what kind of electricity meter is in line with the legal requirements of the electricity meter?

Watt-hour meter nameplate shall include at least the following information: name of watt-hour meter, model, factory number, accuracy grades, watt-hour meter constant, frequency of reference, the reference voltage, the reference current and the maximum current, according to the standard code product, factory name or trademark, the production date, the measuring unit, widely the decimal digits, or multiple value. In addition, qualified electric meters should also have the following marks:

Things you didn't know about electricity meters

(1) The nameplate of the electricity meter shall have the National Metering Manufacturing License (CMC) mark and license number;

(2) The outer shell of the electricity meter shall be affixed with the verification certificate of the verification institution and marked with the validity period;

​gemmore Mall meter

2. What is the meaning of the nameplate of the electricity meter?

On the nameplate of the electricity meter, we can see the following terms: single phase, three phase, active power, reactive power, etc. The nameplate is also marked with the registration model: such as DDS×××, the first D stands for "electricity meter", the second D stands for "single phase", and S is the English static character of "static type (commonly known as electronic type)". "×××" stands for different meters produced by different businesses. China adopts 220V voltage system, the frequency of alternating current is 50Hz. Special attention should be paid to the marked current range: for example, 5(20) A means that the base current is 5A and the maximum current is 20A. The nameplate is also marked with the logo of ① or ②, ① represents the accuracy of the electricity meter is 1%, or called a level 1 meter; 2 represents the accuracy of the electricity meter is 2%, or called the 2 level meter.

3. Why does a red light keep flashing when the electricity meter is in use?

Each meter will have a red indicator light -- a pulse light -- that will flash when electricity is used. The "1600IMP/kWh" marked on the nameplate of the electric meter is the pulse constant, which is the number of pulses per kWh, indicating that the customer consumes 1 kWh of power, and the pulse lamp flickers 1600 times. Pulse lamp flicker frequency changes with the power load. The greater the power load, the faster the power consumption, the pulse lamp flicker faster.

4, how to understand the current specifications of the electricity meter?

The capacity of an electricity meter is expressed in terms of the maximum current. For example, the parameter of an electricity meter of A certain model is 220V,5(20)A, indicating that the rated voltage of the electricity meter is 220V, the basic current is 5A, and the rated maximum current is 20A. If the usage load exceeds the maximum current of the meter, the meter may burn out and even cause a fire.

Gemmore Mall meter

5. Why should electricity meters be rotated periodically?

With the prolongation of the use time of electric energy meter, mechanical wear or aging of electronic components will occur, which will often lead to the measurement error exceeding the international allowable error limit. In order to ensure the measurement accuracy of the electricity meter, it is necessary to dismantle the electricity meter for periodic verification according to the relevant national regulations.

6. Do smart meters run faster than mechanical ones?

Smart meters are more sensitive than mechanical meters. They use appliances of a few watts or even a few tenths of a watt. Traditional meters run very slowly or not at all, but smart meters can measure accurately.

In addition, the traditional electricity meter is usually an "induction meter" in which the disk rotates with the electricity consumption. The disk is supported by bearings. As time goes by, the bearings will gradually age and the friction will increase, and the rotation speed will slow down. So when you switch to a smart meter, it feels like it's going faster than it used to,

The electricity saving advertised by smart meters is actually mainly to urge users to change their daily consumption habits and optimize their consumption mode. Pay attention to the electrical details. For example, after turning off the TV or computer, the power switch on the screen is still on, or the computer is in standby state... The amount of electricity used, though small, adds up over time.

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