Gone are the days when electricity bills were calculated based on the power of lighting equipment and other electrical equipment located in the room. Currently, the presence of an electrical energy meter is a prerequisite for connecting a consumer to general power supply networks. Modern electricity meters allow you to accurately determine the amount of electricity consumed and calculate fees for its use.
But sometimes these reliable devices completely fail and must be replaced. In this case, you need to connect a new device that records the amount of kW/hours of electricity consumed. Replacing an electric meter is not a very difficult operation, but if you don’t understand anything about electrical engineering, then contact a specialist electrician to avoid irreparable mistakes. If you decide to install an electric meter with your own hands, you should choose a reliable device and carefully study the connection diagram of the device in the electrical panel.
The most popular electricity metering devices on the market are devices from Incotex. These include single-phase electricity meters Mercury 201 and three-phase electricity meters Mercury 230. They have high accuracy, reliability, resistance to overloads, low energy consumption and a long service life. In this article we will consider the following issues: connection diagram for a Mercury meter, both single-phase and three-phase, as well as how to connect a Mercury 201 meter.
Attention! Single-phase electricity meters of the Mercury brand are an excellent replacement for completely outdated, both morally and technologically, electricity metering devices with rotating disks.
The single-phase electricity meter Mercury 201 is a metering device that monitors electricity consumption “modulo”. This connection means that installing the device in a network with any current polarity will not affect its operation in any way. If during installation the output and input are swapped or the phase is connected to neutral, this will not lead to catastrophic consequences and the electric meter will continue to take into account the amount of electricity consumed. But still, the manufacturer strongly recommends installing the Mercury 201 meter in accordance with the standard connection diagram. This circuit is quite simple and easy to understand by a user with minimal knowledge of electrical engineering.
The connection diagram of the three-phase electricity meter Mercury 230 is also quite simple, only the number of connected contacts increases, and the principle is the same as with the Mercury 201 meter. However, for three-phase devices there are two connection options: direct and semi-indirect through current transformers. Connection via current transformers is carried out when the load is more than 60 kW. Let's consider both options separately.
We reviewed the connection diagrams for Mercury 201 and Mercury 230 meters. This information is the basic information in accordance with which these metering devices should be installed in the distribution board. The installation of electricity meters from the Mercury company must be carried out in compliance with the requirements of regulatory documents and the manufacturer. Using the example of connecting the Mercury 201 meter, we will consider this process in detail.
The connection of the Mercury 201 meter in the electrical panel is carried out according to the diagram discussed above or printed in the technical documentation attached to the device. The installation of the electric meter in the switchboard is carried out on a DIN rail using a special mounting strip, but we will consider this process without reference to the distribution panel. As an example, let’s take a meter with a mechanical indicator of the amount of electricity consumed.
The standard connection diagram for the Mercury 201 meter is located on the inside of the device cover, which covers the contacts of the device.
The entire process of connecting an electric meter comes down to a few simple steps, which will be described below.
As we can see, installing an electric meter in an electrical network is a very simple operation that can be done independently. But it should be noted that if you were able to install the Mercury 201 meter with your own hands, then after that you need to invite a representative of the electricity supplier to check the quality of the installation of the meter and its sealing.
Important! Before proceeding with the installation of the Mercury series electric meter, it is necessary to de-energize the network by turning off the input circuit breakers, plugs or other switching devices.
In this article, we looked at connection diagrams for Mercury electricity meters in a visual form. The question of the installation location, methods of installing the device and other features of connecting metering devices was not considered, since this is the topic of another article!
Product in stock! Prices 2019
Conditions for ordering and delivery of adapters for communication with Mercury meters
(requests by email [email protected] or by phone 8-909-283-34-16)
1) Automation unit - WiFi router (model VR-007.4) Cost 5000 rubles. Buy. Miniature SPD for polling lists of Mercury meters via any of the connected USB-RS485/CAN/IRDA/optoport interfaces. It can independently poll 10 three-phase Mercury meters, or create an end-to-end tunnel through itself for polling by external programs of an unlimited list of meters.
2) Cost 3300 rubles. Buy. A complete hardware device for transmitting data between an Ethernet local network and a wired RS485 interface. Widely used to automate readings from metering devices, including Mercury electricity meters. Works with all types of TCP/IP protocols in server and client modes. Can be connected to the Internet for remote monitoring of ASKUE metering objects.
3) Cost 1950 rubles. Buy. Interface converter for electricity meters Mercury-230, 231, CE-102 containing IRDA interfaces. To connect to an electric meter, it does not require opening the terminal box.
4) Cost 1950 rubles. Buy. Universal converter of wired interfaces RS485/CAN. Can supply power to the electric meter interface. Suitable for Mercury-200, 203.2T, 206, 230, 233, 234, 236 containing RS485/CAN. Connection requires opening the terminal box. It is possible to connect highways with meters.
5) Cost 850 rubles. Buy. Suitable for Mercury electricity meters that do not need to power the communication interface. It has only output terminals D+ and D-. Can be used with Mercury-203.2T, 206, 230, 233, 234, 236, containing RS485. It is necessary to open the terminal box for connection.
6) Cost 1950 rubles. Buy. Suitable for electricity meters Mercury-201.8TLO, 203.2T, 206, 233, 234, 236, containing an optical port. Connection does not require opening the terminal box.
8) Cost 4000 rubles. Buy. Miniature radio modems with a transparent communication channel, allowing you to work with electricity meters in radio extender mode. They have the ability to connect to industrial RS485/CAN interfaces and allow you to create group or single electricity metering units in hard-to-reach places.
9) Cost 2000 rubles. Buy. The modem has specialized Hilink firmware, works with all SIM cards, has advanced settings (built-in firewall, SMS, USSD, displays service information about signal levels and much more). Allows you to provide VR-007 automation nodes with the Internet and create the ability to poll electricity meters via 3G networks.
10) Cost 4200 rubles. Buy. A smart home element that allows automated polling of a three-phase Mercury meter through any of the connected USB-RS485/CAN/IRDA/optoport interfaces. It has its own adaptable Web interface, a database, and can conduct a minute-by-minute survey of instantaneous values of currents, voltages, powers, and build energy graphs by month and day. It has the ability to broadcast a webcam and weather stations through itself, and is an element of a smart home capable of transmitting consumption data to the user’s email and sales. Can output data to the Narodmon.ru server and report critical situations.
Delivery (added to the cost of the product):
1) Russian Post - first class registered parcel. Price 300 rubles. Delivery time is 3-5 working days. A track number is issued.
2. Description of the meter and its operating principle
2.1 Purpose of the meter
2.1.1 The meter modifications covered by this manual are shown in Table 1
Table 1
2.1.2 Examples of recording meters when ordering them and in the documentation of other products in which they can be used:
“Single-tariff static AC active energy watt-hour meter MERCURY-200.02”, accuracy class 1(2), AVLG.411152.020 TU.”
“Multi-tariff static AC active energy watt-hour meter “MERCURY-200.04”, accuracy class 1(2), AVLG.411152.020 TU.”
2.1.3 The meter is designed to account for active electrical energy in two-wire AC networks with a voltage of 230 V, frequency (50 ± 1) Hz, base/maximum current 5/60 A, respectively.
2.1.4 The multi-tariff meter stores in non-volatile memory with the possibility of subsequent viewing on the indicator the value of the accounted active energy at four tariffs from the moment the meter is put into operation. As well as the value of the accounted active energy from the beginning of operation on the first day of each of the previous 11 months for each current tariff and the amount for all tariffs with a cumulative total.
2.1.5 The multi-tariff meter allows you to view the energy values on the indicator using the buttons on the front panel of the meter.
2.1.6 The multi-tariff meter has a built-in “CAN” or RS-485 interface (according to Table 1) and can be operated either independently or as part of automated control and electricity metering systems.
2.1.7 By default, unless otherwise specified when ordering and otherwise not indicated in special notes in the passport AVLG.411152.020 PS, the meter is supplied with preset hours corresponding to the “Moscow” time zone and the Moscow tariff schedule: T1 from 07:00 to 23 :00, T2 from 23:00 to 07:00.
2.2 Environmental conditions
2.2.1 The meter is designed for operation indoors. According to operating conditions, it belongs to group 4 of GOST 22261 with a temperature range from minus 40 to plus 55 ° C.
Note: - When operating meters at temperatures from minus 20 to minus 40 ° C, partial loss of functionality of the liquid crystal indicator is allowed
2.3 Contents of the meter kit
2.3.1 The contents of the meter kit are given in Table 2.
table 2
| Document designation | | Name and symbol | ||
|
Static single-phase active energy meter “Mercury 200.02” (or “Mercury 200.04” or “Medatoy 200.05”) in consumer packaging |
1 | ||
|
AVLG.411152.020 PS |
1 | ||
|
AVLG.411152.020 RE |
Manual |
1 | |
|
AVLG.420.20.99-01 |
1 | ||
|
AVLG.411152.020 RE1* |
Verification method with test software | 1 | |
|
AVLG.650.00.00* |
USB-CAN/RS-232/RS-485 interface converter “Mercury 221” for programming meters and reading information via the interface | ||
|
AVLG.651.00.00* |
Technological device “RS-232 - PLC” for programming the network address of the meter via the power network | 1 | |
|
AVLG.699.00.00* |
Concentrator "Mercury 225" for reading information from meters via the power network | 1 | |
|
AVLG.411152.028 PC** |
Medium Repair Guide | 1 | |
| * Delivered on a separate order to organizations that verify and operate meters.** Delivered on a separate order to organizations that carry out post-warranty repairs. | |||
2.4 Specifications
2.4.1The basic current value (16) is 5 A. The maximum current value (Imax) is 60 A.
The nominal voltage value (U nom) is 230 V. The voltage ranges correspond to those given in Table 3.
Table 3
2.4.3 Mains frequency (50+1) Hz.
2.4.4 The limits of the permissible basic relative error of the meters correspond to accuracy class 1 or 2 according to GOST R 52322.
2.4.5 Starting current (sensitivity)
The meter begins to record readings at a current value of 20 mA for a meter of accuracy class 1 and 25 mA for a meter of accuracy class 2, with a power factor equal to unity.
2.4.6 The meter has a pulse output of the main transmitting device. When the meter is switched to verification mode, this output functions as a verification output. Telemetry/verification switching is carried out by command from the interface.
2.4.6.1 The constant (gear ratio) of the meter corresponds to 5000 imp/kWh or 10,000 imp/kWh.
2.4.6.2 In the “closed” state, the resistance of the output circuit of the transmitting device does not exceed 200 Ohms. In the “open” state - at least 50 kOhm.
The maximum permissible current value that the output circuit of the transmitting device can withstand in the “closed” state does not exceed 30 mA.
The maximum permissible voltage value at the output terminals of the transmitting device in the “open” state is not less than 24 V.
2.4.7 Energy consumption is measured using a liquid crystal display (LCD). The meter's LCD can display:
Current tariff number “T1”, “T2”, “TZ”, “T4”;
The value of electricity consumed from the beginning of operation for each tariff and the amount for all tariffs in kWh;
Current value of active power in the load in kW (reference value);
Current time;
Current date - day, month, year;
The value of electricity consumed from the beginning of operation on the first day of each of the previous 11 months for each tariff and the amount for all tariffs (electricity metering data is displayed in whole units of kWh);
Time for switching tariff zones (tariff schedule for the current day);
Network address number and network number (for meters “Mercury 200.04” and “Mercury 200.05”);
PLC signal level (for Mercury 200.04 and Mercury 200.05 meters).
2.4.8 The meter can be programmed and read using a computer via a communication interface for the following parameters:
Individual address;
Group address;
Tariff schedule and holiday schedule:
Current time (hours, minutes, seconds);
Dates (day, month, year);
Flag for allowing the transition from “summer” time to “winter” time and back;
Load power reading;
Flag for allowing time correction using counter buttons;
Pulse output gear ratio;
Exchange speeds;
Resolution of cyclic indication and control of it;
Number of current tariffs;
Power limit;
Energy limit per month.
2.4.9 The meter with a PLC modem provides programming of the parameters listed in clause 2.4.8 and transmits information
formation of consumed electricity on an accrual basis from the moment the meter was put into operation according to the current
tariff at the time of the survey.
2.4.10 The meter performs the load control function. The load is controlled by a pulse output (pins 10, 11) by switching to the appropriate mode using a command from the CAN interface (RS-485) or PLC modem. The load is controlled by an actuator, the state of which is determined by the state of the pulse output. The load is disconnected - the state of contacts 10, 11 is “closed”, the load is connected - the state of contacts 10, 11 is “open”.
2.4.11 The clock accuracy at normal temperature (20±5°C) is no more than ±0.5 s/day. The accuracy of the clock when the power is off and in the operating temperature range does not exceed ± 5 s/day.
2.4.12 The active and apparent power consumed by the meter voltage circuit at rated voltage, normal temperature and rated frequency does not exceed 2 W and 10 VA, respectively.
2.4.12.1 In a meter with a PLC modem, the active and apparent power does not exceed 3 W and 30 VA, respectively.
2.4.13 The total power consumed by the meter current circuit at base current, rated frequency and normal temperature does not exceed 2.5 VA.
2.4.14 Initial start of the counter.
The meter begins to function normally no later than 5 s after the rated voltage is applied to its terminals.
2.4.15 Lack of self-propelled guns
In the absence of current in the series circuit and a voltage value equal to 1.15 U nom, the test output of the meter does not create more than one pulse for a time equal to 4.4 minutes and 3.5 minutes for meters of accuracy class 1 and 2, respectively.
2.4.16 The meter can withstand short-term overloads with current exceeding 30 times the maximum current with a permissible deviation from 0% to minus 10% during one half-cycle at the rated frequency.
In this case, the change in the meter error with a top equal to 16 and a power factor equal to unity does not exceed ±1.5%.
2.4.17 The meter is resistant to dips and short-term voltage interruptions.
2.4.18 Isolation
2.4.18.1 The insulation between all connected current and voltage circuits on one side, “ground” and the auxiliary circuits connected together on the other side, with the meter body and terminal cover closed, withstands the influence of an alternating current voltage of 4 kV (rms) for 1 minute value) with a frequency of 45-65 Hz.
2.4.18.2 The insulation between the interconnected serial and parallel electrical circuits of the meter and the “ground” withstands tenfold exposure to a pulse voltage of one and then the other polarity with a peak value of 6 kV.
2.4.19 The established maximum operating temperature range is from minus 40 to plus 55 °C.
2.4.20 The maximum storage and transportation range is from minus 45 to plus 70 °C.
2.4.21 The average time between failures of the meter is at least 150,000 hours.
2.4.22 The average service life of the meter before major repairs is 30 years.
2.4.23 Design parameters of the meter:
Weight no more than 0.6 kg;
Overall dimensions 156x138x58 mm.
2.5 Design and operation of the meter
2.5.1 Structurally, the meter consists of the following components:
Housings (body bases, housing covers, terminal covers);
Contact block with current sensor (shunt);
Electronic module printed circuit board;
Pushers for display control buttons on the meter body.
The printed circuit board of the electronic module is a board with electronic components, which is installed at the base of the housing on stops and secured with latches. The printed circuit board is connected to the terminal block using wires.
On the printed circuit board there are:
Microcircuit - signal amplifier;
Power unit;
Microcontroller (MK);
Non-volatile storage device;
Backup power element;
Interface driver chip;
PLC modem (for Mercury 200.04 and Mercury 200.05)
Elements of optocouplers.
2.5.2 The block diagram of the meter is shown in Figure 1
2.5.2.1 Current and voltage sensors.
The meter uses a shunt as a current sensor.
A resistive divider is used as a voltage sensor in the meter.
Signals from the current sensor are sent to the input of the signal amplifier microcircuit, signals from the voltage peak are sent to the analog input of the microcontroller.
2.5.2.2 The microcontroller processes analog signals coming from the voltage sensor and the signal amplifier microcircuit, processes the received signals and sends the result to the liquid crystal display for display.
2.5.2.3 The MK controls all meter nodes and implements measuring algorithms in accordance with a specialized program placed in the internal program memory. The meter nodes are controlled through software interfaces implemented on the input/output ports
UART for RS-485 or CAN;
Two wire for PLC;
I 2 C interface for communication with non-volatile memory.
The MK periodically determines the current tariff zone, generates telemetry pulses, keeps track of energy and time, processes received commands via the interface or modem and, if necessary, generates a response. In addition to data on metered electricity, the MC RAM stores calibration coefficients, tariff schedule, serial number, meter software version, etc. Calibration coefficients are stored in memory at the factory and are protected by removing the write enable jumper. Without opening the meter and installing a jumper, it is impossible to change the calibration coefficients at the stage of operation of the meter.
In the absence of supply voltage, the MK is switched to a low-consumption mode with a decrease in power from a lithium battery with a voltage of 3 V. Every second, the MK goes into normal mode for continuous time calculation.
The MK is synchronized by an external quartz resonator operating at a frequency of 32.768 kHz. The clock accuracy is set and corrected using software.
The MK controls the operation of the display device to display the measured data. The display can be changed using the display control button.
To organize communication with an external control computer, an interface driver chip is used. Information interface signals from the MK through the optocoupler are sent to the interface driver chip, operating at speeds from 600 to 9600 Bol. Signals from the interface driver chip are sent to pins 2 and 3 of the counter.
2.5.2.4 Non-volatile storage device
The control unit includes a non-volatile memory chip (EEiPROM).
The microcircuit is designed for periodic storage of MK data. In the event of an emergency mode (“freezing” of the MK or a drop in the voltage of the lithium battery), the MK restores data from the EEPROM.
2.5.2.5 Optocoupler block.
The optocoupler block is made of three LED-phototransistor optocouplers. Two optocouplers are designed to provide galvanic isolation of the meter interface circuits. One optocoupler is used for the pulse input of the counter.
2.5.3 The meter indication device consists of a liquid crystal display (LCD) and an LCD driver.
The LCD driver dynamically outputs information stored in its memory to the corresponding LCD segments.
The LCD panel contains the following indication elements:
Eight digits of the recorded energy with a fixed point before the two least significant digits;
Icons for displaying tariffs (T1, T2, TZ, T4) - on the left;
The “Amount” icon is at the bottom of the indicator;
The Mercury 200 meter is a device that allows you to take into account the volume of electricity consumed in the residential and commercial sectors and is installed in single-phase electric networks. The energy meter is operated separately or connected to a centralized information display system.
The electric meter of this model is characterized by the following functionality:
The device has a 30-year standard service life. Warranty repair or replacement is possible within 3 initial years after commissioning, if the malfunction is related to a manufacturing defect and is not caused by incorrect connection or unacceptable operating conditions.
The manufacturer verifies the device after release; in further operation, the device must be verified at intervals of 16 years. The date and results of the verification are evidenced by a record in the passport documentation of the energy meter, carried out by the authorized employee who performed this operation.
The price for these products is from 2,700 rubles and above, depending on the region in which the electric meter is purchased. When ordering in bulk or purchasing online, the buyer may hope for some discount.
The display displays the following information:
The device is equipped with protection against unauthorized use. When changing the direction of the current, the information will be recorded in a larger direction.
The energy meter has numerous advantages due to the following points:
An adapter strip, which makes it easier to replace an outdated induction meter model, is included in the kit of this device, which greatly simplifies the installation of the device.
Readings are taken manually - when you press the button, the information on tariffs changes, as indicated by the corresponding designation of the displayed section. The second option is to write out the data, waiting for the information displayed on the screen to automatically change.
The indicators are compared at the beginning and end of the month separately for each of the configured prices, then the total values are summed up.
The manufacturer produces two varieties of this device. Below are the features of the modifications.
It is characterized by the value of normal electric current - 5, maximum - 60 A, voltage - 230 V, interface type - CAN.
All characteristics of this device fully correspond to the above model. The type of interface is different. In addition to CAN, a PLC-I modem is also installed.
Installation and connection of the device must be carried out by a qualified specialist. It is necessary to first submit an application to the energy supply company, since in the case of self-connection there may be problems with official commissioning.
The connection diagram is quite simple and does not require the use of additional devices:
This energy meter model is a reliable and durable device that meets the necessary standards required by domestic legislation.
Meter Mercury 200.02 5(60) 220V
The Mercury 200 electricity meter displays on the LCD indicator:
The Mercury 200 electricity meter with a PLC modem provides programming and reading using a computer via a communication interface of the following parameters:
A meter with a PLC modem provides programming and transmits information about consumed electricity on an accrual basis from the moment the meter is put into operation at the current tariff at the time of polling.
The meter performs the load control function.
The load is controlled by a pulse output (pins 10, 11) by switching to the appropriate mode by command from the CAN interface (RS-485) or PLC modem. The load is controlled by an actuator, the state of which is determined by the state of the pulse output. The load is disconnected - the state of contacts 10, 11 is “closed”, the load is connected - the state of contacts 10, 11 is “open” The clock accuracy at normal temperature (20±5°C) is no more than ±0.5 s/day. The accuracy of the clock when the power is off and in the operating temperature range does not exceed ± 5 s/day. The active and apparent power consumed by the meter voltage circuit at rated voltage, normal temperature and rated frequency does not exceed 2 W and 10 V?A, respectively. In a meter with a PLC modem, the active and total power does not exceed 3 W and 30 VA, respectively. The total power consumed by the meter's current circuit at base current, rated frequency and normal temperature does not exceed 2.5 V?A.
The meter begins to function normally no later than 5 s after the rated voltage is applied to its terminals. Lack of self-propelled guns. In the absence of current in the series circuit and the voltage value equal to 1.15 Unom, the test output of the meter does not create more than one pulse within a time equal to 4.4 minutes and 3.5 minutes for meters of accuracy class 1 and 2, respectively. The meter can withstand short-term overloads with current exceeding 30 times the maximum current with a permissible deviation from 0% to minus 10% during one half-cycle at the rated frequency. In this case, the change in the meter error at a current equal to Ib and a power factor equal to unity does not exceed ±1.5%. The meter is resistant to dips and short-term voltage interruptions.
The insulation between all connected current and voltage circuits on the one hand, “ground” and the auxiliary circuits connected together on the other side, with the meter body and terminal cover closed, withstands the influence of an alternating current voltage of 4 kV (root mean square value) frequency for 1 minute 45-65 Hz. The insulation between the connected serial and parallel electrical circuits of the meter and the “ground” withstands tenfold exposure to a pulse voltage of one and then the other polarity with a peak value of 6 kV. The established maximum operating temperature range is from minus 40 to plus 55 °C. The maximum range of storage and transportation is from minus 45 to plus 70 ° C. The average time between failures of the meter is at least 150,000 hours. The average service life of the meter before major repairs is 30 years.
