In the Russian market, the most common three-phase electricity meters are devices of the Mercury brand. More advanced devices have many advantages in comparison with outdated counterparts, in particular - ease of connection and use, long operational life and affordable cost.
Types of three-phase electricity meters
Three-phase electricity meters have recently been used only at industrial facilities in order to accurately control the consumption of electricity consumed in production. This was facilitated by the advantages of electric meters - improved technical characteristics and reliability. There are three types of three-phase electricity meters:
- Direct connection. The peculiarity lies in the direct connection of the device to the electrical line.
- Indirect connection. This type of metering device is connected using a special transformer for high-voltage connections 6-10 kV or more.
- Semi-indirect connection. The peculiarity lies in the connection by means of a transformer in networks up to 60 kW.
When installing single-phase metering devices, one connection diagram is used. Three-phase are connected in several ways.
Features of the three-phase electricity meter "Mercury"
In the process of manufacturing various models of the Mercury brand, the developers used the successful practices of other specialists from this industry. Their task was to manufacture a metering device with high measurement accuracy and reliability, equipped with a modern element base, as well as advanced functionality and low cost.
The peculiarity of the electric meters of this brand lies in the circuit design, it has the maximum possible functionality. The project was implemented thanks to imported parts from leading manufacturers. As a result, a three-phase "Mercury" electric meter appeared on the market with the following advantages:
- compact dimensions and low weight;
- low measurement error;
- durability and reliability in operation;
- the ability to connect to a centralized system;
A manufacturer's warranty is provided.
Specifications
All electricity meters are divided into electronic and induction models. The difference between mechanical devices is less high accuracy and reliability.
Modern electricity meters have additional functionality that allows you not only to keep track of the amount of resource consumed, but also to monitor various parameters, as well as monitor the state and performance of the device itself. Data from electronic devices can be read remotely via a software structure. In general, Mercury metering devices have the following technical features:
- Extended operating temperature range.
- In the event of faults in the connection of the current series, the possibility of theft of electricity is excluded.
- Technological resource by type of accuracy.
- There is a manual and automatic reading mode.
- The device itself consumes very little electricity.
Different interfaces make it possible to operate the devices in an automated system for commercial accounting of the consumed resource.
Functionality
Three-phase meter "Mercury" is capable of performing the following functions:
- Manual control of power parameters.
- Accounting, recording and display of all information on the built-in display, the possibility of their remote transmission.
- The ability to track the characteristics of the electrical network with fixing deviations.
- Regulation of the set rates according to tariffs.
- Recording of the main events in the device memory.
Metering devices manufactured by Mercury fully comply with the requirements of state regulations.
Accounting parameters, their measurement and recording
It is easy to take readings from three-phase electricity meters, since all the necessary information is displayed on the built-in LCD display.
First, you need to prepare a blank sheet of paper and a pen; to take readings, pay attention to the indication, which indicates the variety of displayed data. If the meter is two-tariff, first readings are taken under the marking T1 - daytime, and then T2 - nighttime. The cost of electricity consumed at night is less. The number of kilowatts is multiplied by the cost of 1 kilowatt of the resource, the data is added. It is required to purchase special receipts for two-tariff metering devices, where there is enough column to fill in all the information.
For ease of use, manufacturers have also developed software that facilitates the task of processing and transmitting information. The launch is carried out when connected to a computer or phone on the Windows platform.
Wiring diagram for a three-phase meter "Mercury"
The choice of the most suitable connection scheme depends on the type of controlling metering device. Three-phase can operate in conditions of standard electrical networks in 220V.
For direct-flow equipment, the transmitted current should not exceed 100 A. As a result, this becomes the reason for limiting the operation of the device in terms of power, which reaches no more than 60 kW. The device is equipped with terminal contacts, their holes are designed for connecting wires with a small cross-section. As a rule, the cross-section of such a wiring ranges from 25 mm sq.
Electronic three-phase electricity meters have a standard connection diagram, which is indicated on the back cover of the device. Installation is straightforward.
The average service life of the equipment of the "Mercury" brand is 15 years. When buying, it is important to make sure that there is a warranty card among the accompanying documentation.
