Q:Can you offer APPs or software to manage the meters?
As we are a hardware- energy meter factory, we mainly produce various of energy meters such as WIFI energy meter, 4g smart energy meter, Lorawan power meter, RS485 modbus energy meter etc. We don't produce the software. but we offer a simple pc software for performance testing. And we offer technical support to API in different system such as Tuya, HES system. We highly recommend you can use a local system or APP coz no barriers on languages and bank payment etc.
Q:Are there global standards for LoRaWAN?
Yes, LoRaWAN operates on global open standards to ensure interoperability. The LoRa Alliance, a non-profit association, manages and promotes these standards, fostering a collaborative ecosystem for the development and deployment of LoRaWAN technology.
Q:What's M-bus and wM-bus(wireless M-bus)?
M-Bus is a European standard that’s already widely used in buildings and was specifically developed for smart meters. It includes physical, data, network, and application layers, but no transport, session, or presentation layers. With M-Bus, smart meters need a gateway to convert the data to TCP/IP for transport to the cloud. Wireless M-Bus is simply a wireless version of the M-Bus standard. It’s already widely available in Europe, but there was initially no official certification program, so smart meter manufacturers who served several countries could encounter challenges with interoperability. To resolve this issue and increase compatibility, the Open Metering System Group standardized the protocol, and now manufacturers need to be OMS certified.Wireless M-Bus operates on three different frequencies, depending on the mode a meter or gateway uses. All three frequencies are sub-GHz, enabling signals to travel further and penetrate walls and buildings more effectively. As with M-
Q:What is the IEC 62052 11 standard?
Covers type tests for electricity metering equipment for indoor and outdoor application and to newly manufactured equipment designed to measure the electric energy on 50 Hz or 60 Hz networks, with a voltage up to 600 V.
Q:What is the EN50470-1 / EN50470-2 / EN50470-3 standard
3 specific European standards for active energy meters: EN50470-1 / EN50470-2 / EN50470-3. These standards specify the particular requirements and type tests for electrical energy meters. The EN50470-1/-3 standard defines three specific accuracy classes: A, B and C. These are comparable to the IEC62053-21/-22 active energy metering standard: Class A is equivalent to 2% accuracy, Class B to 1 % and Class C to 0.5 %.
Q:What is starting current of meter and what are the general minimum starting currents?
The starting current is the current value that determines the relevant characteristics of the meter, also called the calibration current value, which is determined by the starting current of the electric energy meter. Generally, the greater the multiple of the meter, the more accurate the measurement at low current. The multiple algorithm of the meter is based on the maximum rating. Current/basic current. That is, the current that the meter needs to reach when it starts. Generally speaking, there are 0.2%, 0.4%, 0.5%. Take the current of 10 (80) A, IB 0.5% as an example. The starting current of this electric meter is 10*0.5%=0.05, which means that the electric current must reach 0.05 before the electric meter starts to work and start measuring.
Q:What is the voltage (current) imbalance rate of smart energy meters?
In a three-phase power supply system, the voltage (current) unbalance rate is the difference between the maximum phase voltage (current) and the minimum phase voltage (current) as a percentage of the maximum phase voltage (current).
Q:What is the current imbalance of smart energy meters?
When any of the three-phase currents is greater than 5% of the rated (basic) current, the current imbalance rate is greater than the set current imbalance rate limit, and the duration is greater than the set current imbalance judgment delay , This working condition is current unbalance.
Q:What is the voltage imbalance of smart energy meters?
When any of the three-phase voltages is greater than the critical voltage of the energy meter, the voltage imbalance rate is greater than the set voltage imbalance rate limit, and the duration is greater than the set voltage imbalance rate judgment delay time, this This working condition is voltage unbalance.
Q:What is the critical voltage of a smart energy meter?
The minimum voltage that the smart energy meter can start to work is the critical voltage, which is generally 60% of the reference voltage. The critical voltage stipulates the minimum voltage for the smart energy meter to start work, which is the specified maximum limit, and the minimum power for the start work of the energy meter design can be lower than this value. Starting the work means that the energy meter can measure, display, and record events normally. It is not mandatory to respond to backlight lighting, communication, tripping, and alarm output. For three-phase energy meters, when the voltage of each phase reaches 60% of the lower limit of the reference voltage or when the single-phase voltage reaches 85% of the reference voltage, the energy meter can start working; for single-phase energy meters, when the voltage reaches When the reference voltage is 60%, the energy meter can start working.
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