Classes of accuracy of electricity meters. Accuracy requirements for the meter

The development of modern industry and household electrical utility goes in parallel with the development of a modern system of electricity, which resulted in the decision to introduce accuracy classes of electricity meters.

How is the situation today?

At the moment, there are many different companies in Russia that manufacture and sell electricity meters, while the technical innovations that different manufacturers offer are unique, and basically they do not lend themselves to comparison. However, many users do not know how to choose the right devices that have really useful functions for each person, and how to correctly determine the accuracy classes of electricity meters.

In the modern world, keeping proper records and managing energy consumption has long ago become one of the most important energy tasks, while one of the last steps of domestic electrical engineering in this direction can be called the initiative aimed at the formation of smart electricity grids.

Features of domestic and foreign practice

Back in 2009, the US decided to allocate the first $ 4 billion for the development of the project using smart networks, and eventually this gave the start to the AMI campaign. The accuracy classes of electricity meters used and developed for the implementation of this project were the most modern digital metering devices, which provide a single dispatch directly with a separate operator's computer. This is by no means the standard electric meter of the 2nd class of accuracy, but a much more accurate and efficient device.

Thus, already in 2015, it was planned to install more than 40 million such meters, which will give a significant impetus to the development of the energy industry of these countries.

In Russia initiatives are also gradually beginning to be implemented that envisage the introduction of not only the basic systems for dispatching meter readings, including the active introduction of special meters that can be combined into a full-fledged information network. Even in the last century, the introduction of such systems of automatic control and metering of electricity was laid, but to create truly large-scale systems at that time it was necessary to have more modern technologies. Taking into account the tendency to active application of microprocessor technologies, this direction allowed creating new classes of accuracy of electric meters.

What are modern devices?

At the moment, high-tech microprocessor meters provide the ability to establish two-way communication with a special dispatching console. It should be noted that there are a variety of ways to transfer information, including broadcasting through power wires, optical port, RF-modem, Wi-Fi channel and many other options. Each of the above combining schemes has advantages and disadvantages.

Also, modern manufacturers have recently introduced a sufficiently large number of characteristics that are unnecessary and incomprehensible to the general consumer, and in particular, for life, weight, degree of moisture and dust protection, the information coding system used, and many other data. Such information is more relevant for specialized energy sales organizations that commission such equipment, as well as those who purchase and install it at various sites.

How is the choice basically done?

In the majority of cases, the main criterion for modern consumers is the price, and even if a person needs, for example, an electric meter of accuracy class 2, eventually he will acquire the device that has the most optimal value. At the same time, technical competent customers can pay attention to the rated current, the type of indicator used and the completeness of the information that this device will provide through its monitor.

However, there is also one more parameter that must be taken into account in the process of choosing the necessary device to account for the consumed energy - this is what class of accuracy is required for apartment electricity meters.

What it is?

In fact, the accuracy class represents the degree of error of a device. This parameter must necessarily be displayed on the front panel of this device and has the form of a digit placed in a circle. Thus, if you purchase an electric meter of the second accuracy class, then in the circle there should be a number "2".

How do they differ?

To date, there is a certain system of standard values of accuracy classes of similar devices, which is adopted not only in Russia, but also in many other civilized countries. This classification distributes all appliances for electricity metering to the following groups:

• 5.0;
• 2.0;
• 1.0;
• 0.5;
• 0.2.

In accordance with this classification, the relevant authorities in different countries decide which accuracy class is needed for apartment electricity meters. At the same time, it should be noted immediately that in a certain number of cases the numbers can be written without a decimal part, and if the Latin letter S is also added to the designation, this means that in the transformer system of this particular counter model a structured metal is used, which provides A higher degree of reliability and durability of this equipment.

The most optimal option in this case is the electric meter of the first class of accuracy.

Why is this parameter so important?

At first glance, a sufficiently large error margin may ultimately prove beneficial to the consumer, and many try to be guided by this, choosing which accuracy class the meter should have. In this case, if the error is inclined to the big side, then, if necessary, you can write a complaint directly to the power supply, and as a result they will be obliged to make an early replacement of the device. However, if the error is directed specifically in favor of the consumer, then in this case it begins to bring a direct benefit to the owner of the apartment.

In this regard, determining what class of accuracy should be in the electricity meter in the apartment, we can say that it is better to choose a device having an accuracy class of 5.0 and 2.0, and install not even an electronic device, but an induction device equipped with a rotating disk, since this The counter can be easily braked. Many in due time heard about what the powerful magnet which is on the lid of this counter has a braking effect.

Is it safe?

In fact, the use of such measures is simply tracked, and many people are trying to figure out how to determine the accuracy class of an electricity meter and to install a really appropriate device in their home. Moreover, it should not be forgotten that such methods of deceiving accounting devices are well known among workers in power supply companies, and any violations recorded by the controller may ultimately result in a serious fine for dishonest consumers.

How to reduce the amount of payment for electricity?

First of all, if you want to reduce the level of energy consumption, you need to figure out how to find out the accuracy class of the electricity meter, and decide on the most optimal device for your apartment or private house. Also you should use only specialized economical electrical equipment. Depending on how the appliance consumes power and emits light, all devices are divided into seven main classes, with the corresponding letters from A to G. Thus, A-class devices are the most efficient and economical among all others.

Non-contact devices

For owners of non-contact devices, it is not even necessary to know the required accuracy class of the electricity meter. Recently, such equipment has become widespread on the market and is purchased by many owners of apartments and private houses.

A non-contact electricity meter is a device that differs from the others in a fundamentally different way of collecting information. In an ordinary device, the use of a winding of current and voltage is provided, which ensures the flow of all the current necessary for the operation of various devices. It should be noted that in this scheme, the entire electrical network of the meter will remain permanently under voltage ~ 220V, and at the same time it will be subjected to exactly the same voltage jumps as in the case of a home network. This option is rather unreliable regardless of whether you use an energy meter of accuracy class 2.5 or use any other devices.

What are their advantages?

In the case of a non-contact device, the current winding does not have any constructive conjugation with the logical part. The values of the flowing current are removed without the need to provide direct contact with the wire using an isolated current transformer. It should be noted that the accuracy of such equipment significantly exceeds the accuracy of standard devices due to the fact that any additional interference in the logical scheme is completely absent. In other words, it is impossible to meet contactless power meters of accuracy class 2.0 or any similar devices.

In order to remove the voltage values, the two wires passing through this device should not develop. The use of specialized clamping screws allows direct contact with the wire at one point, which allows for an increased degree of dust and moisture resistance of the equipment. At the same time, the voltage ~ 220V can not be admitted to the logic circuit of the counter with the help of specialized circuit solutions, as well as the use of additional galvanic isolation.

Such devices can be installed by everyone, without even thinking about what accuracy class of the electricity meter it might need. This design is more reliable, has increased protection from external influences, and also in the process of their production provides for increased constructive measures for fire safety. In addition, determining the accuracy class of the electricity meter for the population, it is worth paying attention to these devices also for the reason that they exclude the possibility of theft of electricity.