In this day and age, you may not have a watch, but your home must have an electric meter. As a measuring instrument related to people's livelihood, electricity meter is an indispensable tool for electricity metering and electricity bill settlement.
Have you carefully observed your own electric meters? Do you use traditional mechanical electric meters or smart electric meters? Do you have any doubts about electric meters? Next, I will summarize some common sense problems of electric meters.
1. From the outside of the electric energy meter, what kind of electric energy meter meets the legal requirements?
The nameplate of the electric energy meter should contain at least the following information: electric energy meter name, model, factory number, accuracy grade, electric energy meter constant, reference frequency, reference voltage, reference current and maximum current, product standard code based on, manufacturing Factory name or trademark, date of manufacture, unit of measurement, number of decimal places of the counter or multiples of indication. In addition, qualified meters should also have the following signs:
(1) The nameplate of the electric energy meter should have the national measurement manufacturing license (CMC) mark and license number;
(2) The housing of the electric energy meter should be affixed with the verification certificate of the verification agency and marked with the validity period;
2. What is the meaning of the nameplate of the electric energy meter?
On the nameplate of the electric energy meter, we can see the following terms: single-phase, three-phase, active power, reactive power, etc. The nameplate is also marked with the registered model: such as DDS×××, the first D stands for "energy meter", the second D stands for "single phase", S is the prefix of "static (commonly known as electronic)" in English . "×××" represents different electric meters produced by different enterprises. Our country adopts 220V voltage system, and the frequency of alternating current is 50Hz. Pay special attention to the identified current range: For example, 5(20)A means that the basic current is 5A and the maximum current is 20A. The nameplate is also marked with signs ① or ②, ① represents the accuracy of the electric energy meter is 1%, or called a level 1 meter; ② represents the accuracy of the electric energy meter is 2%, or called the level 2 meter.
3.Why does the red light keep flashing when the energy meter is in use?
Each meter will have a red indicator light-pulse light, and the pulse indicator light of the energy meter will flash when electricity is being used. The “1600imp/kWh” marked on the meter nameplate is the pulse constant. The pulse constant is the number of pulses per kilowatt hour, which means that the customer consumes 1 kWh of electricity and the pulse light flashes 1600 times. The flashing frequency of the pulse lamp changes with the size of the electrical load. The greater the electrical load, the faster the power consumption, and the faster the pulse lamp flashes.
4. How to understand the current specification of the electric energy meter?
The capacity of the electric energy meter is expressed by the maximum current. For example, the parameter of a certain type of electric energy meter is 220V, 5(20)A, which means that the rated voltage of the electric energy meter is 220V, the basic current is 5A, and the maximum rated current is 20A. If the load exceeds the maximum current of the electric energy meter, the electric energy meter may burn out and even cause a fire.
5. Why should the electric energy meter be rotated in cycles?
As the time of use of the electric energy meter is extended, mechanical wear or aging of electronic components will occur, which often causes the measurement error to exceed the internationally allowed error limit. In order to ensure the measurement accuracy of the electric energy meter, it is necessary to disassemble the electric energy meter for periodic verification according to the relevant regulations of the state.
6.Do smart meters go faster than mechanical meters?
Smart meters are more sensitive than mechanical meters. Using electrical appliances of a few watts or even a few tenths of a watt, traditional meters turn very slowly or don't turn at all, but smart meters can accurately measure, and any small current will make the meter turn.
In addition, a traditional electric meter is usually an "induction meter" in which a disc rotates with electricity consumption. The disc is supported by a bearing. As time passes, the bearing gradually ages, friction increases, and the rotation speed becomes slower. The cost is more than actual use. If there is less electricity, this is not the case with smart meters. So if you change the smart meter, you will feel that the meter goes faster than before.
The power saving promoted by smart meters is actually to urge users to change their electricity consumption habits and optimize the way they use electricity. Pay attention to the details of electricity usage. For example, after turning off the TV or computer, the power switch on the screen is still on, or the computer is in standby mode,...... Although this kind of electricity consumption is very small, the electricity bill accumulated over a long period of time is also a lot.