Three-phase electricity meter AIST A300 LoRaWAN

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AIST A300” meter is used for measuring and metering of active and reactive energy in three-phase AC circuits and transmission of telemetric information about the consumed electricity when used in automated data acquisition systems.

LoRaWAN module is designed for installation on the Aist-A300 meter. The device allows to poll the meter and then send data to the server via LoRaWan wireless network. The radio-frequency part of the device allows to work in the frequency range of 863-870 MHz.

Main functions

Electric energy meter three-phase electronic “AIST A300” performs the following functions:

Measurement of current and voltage in each phase.
Calculation of active and reactive energy.
Registration of consumed energy.
Countdown of time and calendar date.
Exchange of information with the concentrator by means of data transfer units.
Data storage in the energy memory.

Consumer and service data are displayed on the liquid crystal display (LCD) located on the front panel of the meter. The meter can be operated autonomously or in an automated system for collecting data on electricity consumption. It is possible to configure the meter parameters using a computer. The meter allows to control electricity consumption taking into account the developed tariff structure.

Digital data transmission interfaces

The meters have RS-485 interface and IR port. The IR port is designed for local communication with the meter via a computer with an adapter for IR communication (USB/IRDA converter). This converter provides an infrared communication channel with the meter. The communication speed of transmission via IR port is 1200 bps. RS-485 allows information transfer between the meter and a hub or a computer with an RS-485 adapter. The RS-485 communication speed can be set within the range of 1200~9600 bps. To perform data exchange it is necessary to use specialized software “AIST Meter Configurator”, as well as appropriate adapters for interface connection. For reading by RS-485 interface it is necessary to connect the meter serial interface circuits via RS-485/USB interface converter to the USB port of a personal computer.

Control relay

The meter has a built-in power relay that can be controlled remotely by a command in the meter protocol format. The command to disable/enable the relay is given via the RS-485 interface or via an additional data input/transmission unit installed in the meter. During the switch-on procedure, after the corresponding command has been given to the meter, it is also required to press the control button on the meter panel and hold it for two seconds – this is an additional protection measure against erroneous switch-on of the meter. Thanks to the power relay built into the meter, remote control of consumers is possible.

Accuracy class of active energy: 0.5S or 1 (Active energy), 1 or 2 (Reactive energy)

Base, Ib (maximum) current, A: 10 (100), 5 (60)

Rated, In, (maximum) current for transformer connection, A: 5 (10), 5 (7,5)

Rated voltage value (Unom), V: 3×230/400 (Direct), 3×230/400 (Transformer), 3×57,7/100 (Transformer)

Starting current (sensitivity threshold): 0.001Ib (Accuracy class 0.5S), 0.004Ib (Accuracy class 1), 0.005Ib (Accuracy class 2)

Set operating voltage range, V: 0.9 to 1.1Unom

Extended voltage range, V: 0.8 to 1.15Unom

Power consumption: 400mA (Current, max), Voltage circuit 5VA/Current circuit 0.2VA

Nominal value of mains frequency, Hz: 50

Maximum number of tariffs: 4

Minimum tariff duration, min: 15

RS485 interface communication speed, bps: 1200~9600

Accuracy of the built-in clock at normal temperature, better, s/day: ± 0,5

LCD display: 0.01 kWh (price of the lowest digit when displaying energy), 8 indicated digits

Meter constant, imp/(kWh): 10000, 10000 1200 (for UUTM 57.7 V, IUTM 5 A), 1200 300 (for UUTM 230 V, IUTM 5 A), 2000 (for UUTM 230 V, IUTM 5 A), 300 2000 (for UUTM 230 V, IUTM 10 A)

Average MTBF, h: 150000 (module), 160000

Service life: at least 10 years, at least 20 years (module)

Operating Temperature, °C: from -40 to +55

Dimensions: 292×174×88 mm, 95x65x28 mm (Module)

Weight, kg: 2.8

Ethernet module: Up to 100 Mbps data transfer rate via 10100 Base T interface

PLC-Module: Communication range – up to 3km, Data transmission mode over low-voltage network – packet, half-duplex, Data transmission speed over low-voltage network – up to 256 Kbps

RF-Module: Communication range – up to 1km, Mode of data transmission via RF-channel – packet, half-duplex, Operating frequency – 430…437 MHz, Speed of information transmission via radio channel – up to 10 Kb/s

3G Module: Data rate – 3.6 Mbps (HSDPA), Operating frequency range – GSM-GPRS 850/900/1800/1900 MHz; WCDMA 900/2100 MHz, Radiated power – 0.25 W (UMTS 2100)

Wi-Fi module: Operating frequency – 2.4…2.4835 GHz, Support IEEE 802.11 n/g/b standards, Wireless channel protection – WPA-PSK/WPA2-PSK, WPA/WPA2-PSK, WPA/WPA2