WUHAN RADARKING ELECTRONICS CORP.
WUHAN RADARKING ELECTRONICS CORP. Electric Meter, Smart Water Meter, Smart Gas Meter & AMI solution
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Three Phase Multi Tariff Lora Smart Meter Remote Meter Reading in LoraWan Technology
Specification:
| Name | Parameter |
| Rated Voltage | 3*220/380V |
| Operating Voltage | 80%~120%(Rated Voltage) |
| Current | 1.5(6)A, 5(20)A, 5(30A), 5(40)A, 5(60)A, 10(40)A, 10(60)A, 15(60)A, 20(80)A |
| Frequency | 50Hz/60Hz |
| Accuracy Class | 1.0 |
| Impulse Constant (imp/kWh) | 6400, 3200, 2400, 1600, 1200, 800, 400, 200 |
| Clock Accuracy(optional) | ≤ 0.5s/Day (Refer to temperature of 23 centigrade); |
| Data Storage Period | ≥ 10 years, the working time lasts more than 5 years even if power off . |
| Power Consumption | ≤ 0.8 W*3 |
| Dimension | 218mm*145mm*72mm |
| Operating Temperature | Normal operating temperature: -25℃ to + 55℃ Limited operating temperature: -40℃ to + 70℃ |
| Standard | GB/T17215.321-2008, DL/T645-2007 |
Main Functions:
Precise metering of active electric energy
Remote reading of real-time electric quantity through low-voltage line
Remote switching-in and load control, indicating of power-up or power-off
Mutual auto relay
LCD, power failure flashing
Freezing of electric quantity, daily frozen electric quantity kept for 7 days; Daily hour total active power meter code stored for 3 days;
Multi-rate and stepped electric energy supported
Three modes switching supported: Normal, stepped rate, time shared rate
Alarming of loss of phase, current loss, and overloaded power off, overpower load value settable
Event recording, recording of programming, timing, tripping, dumping, and uncapping events
IR communication, RS485 communication, and power carrier communication supported
IR and power line carrier programming available
Dimension(218mm×145mm×72mm):
(1) The electric meter should be installed indoors and installed on the wall or in the meter box. The electric meter should be basically vertical when installing.
(2) The voltage to be connected should meet the rated operating voltage, and the current should not exceed the maximum rated current.
(3) In the case of power failure, the wiring should be strictly as shown in the wiring diagram.
(4) The electric meter is fixed on the meter box with three screws.
Working Principle
Measured AC voltage and current have been sampled and transported to professional metering chip, after digital processing, they have been changed to the pulse signal, which in direct proportion to active power, and then sent to microprocessor. Microprocessor would accumulate the pulse signal according to the tariff, then get total power and tariff power and put them in register. At the same time, the microprocessor finishes the function of display and changeover with external messages. Please take attention to the Figure 1
LoRaWAN communication interface:
Using LoRaWAN communication for meter reading and parameter setting. When meter reading, remote meter data transmission software provided by our company can be used for meter reading
and parameter setting. It is also possible to design a software and hardware system that fully
complies with the protocol requirements for meter reading and parameter setting according to the
power industry standard DL/T 645-2007 (supporting part of the communication protocol). Please take attention to the followig points when handle meter reading and parameter setting:
a. Parameter setting, please just setting items which refers to the certain meter
b. LoRaWAN active upload data format:
| Name | Data | Instruction | Length |
| Leading | FEFEFEFE | 4 | |
| Frame starter | 68H | 1 | |
| Address | A5 A4 A3 A2 A1 A0 | Send with low position ahead | 6 |
| Frame starter | 68H | 1 | |
| Control code | 91H | 1 | |
| Length | 1DH | 1 | |
| Data identification | 04601001 | Send with low byte ahead | 4 |
| Com active total energy | XXXXXX．XX | Send with low byte ahead | 4 |
| Positive active total energy | XXXXXX．XX | Send with low byte ahead | 4 |
| Reverse active total energy | XXXXXX．XX | Send with low byte ahead | 2 |
| Voltage | XXX．X | Send with low byte ahead | 2 |
| Current | XXX．XXX | Send with low byte ahead | 3 |
| Active power | XX．XXXX | Send with low byte ahead | 3 |
| Power grid frequency | XX．XX | Send with low byte ahead | 2 |
| Power factor | X．XXX | Send with low byte ahead | 2 |
| Status bit | XX | Send with low byte ahead | 1 |
| Checksum | CS | 1 | |
| Terminator | 16H | 1 |
Carriage and storage:
Our products should be packaged well when being transported. And the products should not be shaken or hit when being transported and unpacked. The carriage and storage should correspond with GB/T15464-1995 "General packing technical conditions of instruments and meters" Inventory and storage should be put on the bracket under the original package, and the stacked height can’t exceed 5 layers. The storage place will be clean and the environment temperature will not more than from -40℃ to +70℃, relative humidity not more than 95% and without corrosive gas and mildew in the air.