1. What is remote meter reading?

The remote meter reading system is designed to achieve real-time and reliable remote data collection from three meters (electricity, water, and gas). This device employs a triple network structure of star, linear, and radio communication to accomplish remote meter reading. A star network connects n MDM (Metered Module) meters (e.g., n=32) to one data acquisition unit. The data acquisition unit connects to a radio station via a linear network. One linear network can connect m acquisition units (e.g., m=128). Therefore, a subnet can share a single radio station for nm=32×128 meters. This is a triple network structure consisting of star, linear, and wireless topologies. The components of this network structure are electricity meters, water meters, or gas meters (hereinafter referred to as the three meters), a data acquisition unit, and a radio transceiver station.

2. Meter reading technology and its implementation methods?

The meter reading system mainly consists of three parts: (1)Data acquisition;(2)Data transmission; (3)Data management, processing, analysis, and statistics.

The data acquisition system employs various methods, including manual meter reading, remote automatic meter reading, and wireless meter reading, with the appropriate solution chosen based on site requirements. The remote meter reading system mainly consists of remote meters, data collectors, concentrators, communication units, UPS power supplies, a management center computer, and system software. The data collectors acquire signals from each remote meter and convert them into corresponding energy consumption figures. The data concentrator collects data from each data collector via an RS485 bus and uploads the collected data to the management center computer. The management center computer performs calculations, queries, statistics, and printing, thereby achieving modern property management of the entire community's energy consumption. This system primarily uses an RS485 bus for communication, with a communication distance of less than 1200 meters between the data concentrator and the data collector (which can be extended by adding repeaters).

3. What are the functions of automatic meter reading and remote meter reading?

To address the difficulties of meter reading and the various drawbacks of manual meter reading, meter reading systems and related equipment offer the following key advantages:

(1) Reduced personnel and management costs:

Traditional meter reading involves sending meter readers to the site for manual recording. Each reader records approximately 2,000 meters per month, resulting in high labor intensity, a large number of personnel, and high management costs. With an automatic meter reading system, water meter reading in a city can be completed in minutes, reducing costs by 90%.

(2) Reduced drawbacks of manual meter reading:

Due to the diversity and complexity of on-site conditions, manual meter reading inevitably leads to under-reading, incorrect reading, estimated reading, missed reading, misreading, and favoritism. Under-reading, missed reading, misreading, and favoritism result in economic losses for water companies, while incorrect reading increases the workload for water companies and causes unnecessary trouble for users. Automatic meter reading eliminates these issues. The reading rate, accuracy, and correctness reach 100%.

(3) The Role of Automatic Meter Reading Systems in Water Price Adjustment

Water price adjustments affect every household. Meter readers must read meters at the designated adjustment times. What used to be a month's worth of work now needs to be completed within a specific timeframe, which is impossible for meter readers, even with increased manpower. This inevitably means the work is completed several days around the adjustment date, resulting in users incurring higher fees and negatively impacting social harmony. Automatic meter reading systems can ensure accuracy. The system only needs to add a single instruction to complete this task, eliminating complaints from both the water company and users.

(4) The role of automatic meter reading systems in water conservation

4.1 Increased Pipeline Leakage Rate

Water supply pipelines are prone to leakage and damage due to various reasons. Without technological means, these phenomena cannot be detected or detected promptly, resulting in wasted tap water. Automatic meter reading systems, through real-time analysis of system line losses (i.e., the difference between the total line meter or assessment meter and the user meter) and sudden changes in flow, can issue timely alarms, allowing maintenance personnel to handle the situation immediately, reducing tap water loss and improving the leakage rate. The loss in the main pipeline is typically between tens and hundreds of tons per hour; timely detection has considerable social and economic benefits.

4.2 Early Detection of Abnormal Water Usage (Running, Spilling, Drips, Leaks, etc.)

Abnormal water usage can manifest in various ways, such as toilet leaks, water pipe seepage, and leaks in solar water heater supply lines, leading to increased water consumption. Failure to detect these issues promptly can result in disputes with users during water bill settlement. Automatic meter reading systems, by comparing 24-hour real-time meter readings (especially continuous water consumption at night or during non-usage times) with the previous month's usage, can quickly identify problems and address them promptly, reducing water loss. Experience shows that a single toilet can lose anywhere from several tons to over ten tons of water per month; while leaks in solar water heater supply lines, due to their hidden nature, can result in over a thousand tons of water loss per month. Timely detection is crucial. Another issue is excessive or insufficient water usage caused by damaged water meters. The system, through the aforementioned analysis methods, can detect this promptly. Excessive or insufficient water usage can lead to conflicts between the water company and users; proactive and timely resolution of these issues has immeasurable social benefits.

(5) The role of automatic meter reading systems in maintaining social stability

Compared with traditional meter reading methods, automatic meter reading systems can effectively avoid the following problems:

5.1 Privacy Issues: Due to rising living standards, increasing property value, and greater emphasis on privacy, residents prefer not to be disturbed.

5.2 Water Bill Sharing Issues: Because meter reading is difficult, some water companies only read the main meter, leaving individual meter readings to individual users. Any shortfall is then shared by the users, leading to suspicion among neighbors, non-cooperation in payment, and serious water bill arrears.

5.3 Burglary Issues: Many criminals use meter reading as a pretext for burglary and robbery, affecting social stability.

(6) The Role of Meter Reading Systems in Refined Management

The system can analyze each user, unit, building, community, and pipeline by hour, day, week, month, quarter, year, or any time period and generate corresponding curves. This provides real-time and reliable data for the water company's dispatching, supply, and production systems, reducing blind spots in operations, lowering costs, and providing a scientific basis for company decision-making.

(7) Social Benefits

Automatic meter reading systems, through technological and automated means, enhance the proactive service capabilities and levels of water management departments, enabling them to promptly address potential problems. Furthermore, the manpower and resources saved by automatic meter reading systems help enterprises improve service efficiency and content, fostering a better harmonious relationship with users and creating a positive social image and benefits for water management authorities.

4. How to cut off power during remote meter reading?

First, remote meter reading requires a communication channel and protocol support. Common communication protocols include DL/T645-97, DL/T645-2007, and GDW130. When your electronic energy meter has valve control functionality and supports corresponding operation commands, you can send a power-off command to the meter to achieve the power-off function.      

5. Which method of remote meter reading system is currently the most technologically advanced?

There is no fixed method or concept for remote automatic meter reading systems. In practical applications, multiple communication technologies are usually used in combination to achieve the most ideal goals, such as cost savings and improved reliability. Currently, the most commonly used method is: Electricity meter ← (485 communication) → Data collector ← (Power line carrier communication) → Concentrator ← (GPRS wireless communication) → Electricity management system. Each method has its advantages and disadvantages, so it's impossible to say which is more advanced.

6. What is wireless remote meter reading?

Wireless remote meter reading refers to the integration of modern mobile communication technology with the power system, transforming traditional manual meter reading into direct transmission of electricity data via wireless networks. It is also a typical application of the Internet of Things (IoT), wireless cities, and smart cities. According to China Mobile staff, the wireless meter reading service utilizes wireless modules mounted on utility meters (such as water and electricity meters) to remotely and accurately collect and process data on water, electricity, and gas usage. These dedicated utility devices then periodically transmit the collected data to a smart management platform via wireless communication modules, thus enabling remote meter reading.

As an important application of IoT technology combined with urban public utilities, China Mobile Shanghai has upgraded its wireless remote meter reading service throughout the city, upgrading the meters of approximately one million households. Power company staff utilize the ubiquitous mobile network to achieve remote automatic meter reading, significantly reducing manual meter reading costs for power companies and sparing Shanghai residents the inconvenience of in-person meter reading. Compared to traditional manual meter reading services, remote wireless meter reading offers advantages such as avoiding disturbing users and significantly reducing the cost of manual meter reading. It also overcomes the limitations of wired line access in some areas, reducing reliance on lines and thus lowering system construction costs. This aligns perfectly with the goals of governments and public institutions to improve user experience and reduce costs. With the full implementation of wireless meter reading, users will be able to know their meter usage more accurately, and the power company can collect daily electricity consumption data. In the future, users can expect to check their daily electricity consumption via the internet or hotline, enjoying open and transparent service. Furthermore, the upgrade cost is borne by the power company. Since meters themselves need to be replaced periodically, the investment is not significantly higher than before, resulting in no additional costs for residents.

7. Water, Electricity, and Gas Meter Centralized Reading System Solution?

Water, Electricity, and Gas Meter Centralized Reading System Solution, Features of the Wireless Remote Meter Reading System:

(1) Strong Real-Time Performance: Due to the real-time online nature of GPRS, the system has no latency and can synchronously receive and process data from multiple/all data collection points without the need for polling. This effectively meets the system's requirements for real-time data acquisition and transmission.

(2) Remote Control of Electricity Meters: The GPRS two-way system also enables remote control of electricity meters, allowing for parameter adjustments, switching, and other control operations.

(3) Low Construction Costs: Utilizing the GPRS wireless public network platform, only equipment installation is required; no dedicated wiring for remote meter reading is needed. Initial investment is low, results are quick, and subsequent upgrades and maintenance costs are low.

(4) Wide Coverage: GPRS has a wide coverage area. Within the coverage area of the wireless GSM/GPRS network, centralized meter reading control and management can be completed. Furthermore, there are no restrictions on expansion or access location, meeting the access needs of mountainous areas, towns, and cross-regional locations.

(5) Large system transmission capacity: The power distribution data center needs to maintain a real-time connection with each electricity meter data collection point. Due to the large number of electricity meter data collection points, the system is required to meet the needs of bursty data transmission, and GPRS technology can well meet the needs of transmitting bursty data.

(6) High data transmission rate: Each electricity meter data collection point transmits data at a rate of less than 10Kbps per transmission. Theoretically, the GPRS network transmission rate can reach 171.2kbit/s, and the current actual GPRS data transmission rate is around 40Kbps, which fully meets the data transmission rate requirement (≥10Kbps) of this system.

(7) Low communication cost: A monthly billing method is adopted, costing less than 20 yuan per month, which is more than enough for the GPRS communication costs of a centralized controller, resulting in low operating costs. Also included are system equipment, reference price, system software, etc.

8. Question: How should the wiring for remote electricity meter reading be connected?

Connect the meter's 485 wire to the data collection unit or DTU, A to A, B to B.

9. What is the working principle, construction process, and wiring precautions for a remote meter reading system?

The key equipment for remote meter reading consists of a data collector and a concentrator. Data collectors are generally used in residential applications such as building corridors. The design typically reads 32 meters at a time. Downlink communication uses RS-485, power line carrier, etc., to communicate with the meters. Uplink communication uses GPRS, CDMA, Ethernet, etc., to communicate with the master station. An additional infrared line is used for maintenance. The working principle is generally to send a communication message to the meters every 5 minutes. The meters feed back the relevant data to the data collector, which stores the data and then waits for the master station to detect or actively send it back. The latest communication protocol is DLT2007 for downlink and Q/GDW 376.1-2009 for uplink.

Concentrators are generally used in large-scale centralized user groups, reading 1024 meters at a time. They primarily use power line carrier communication with the meters, and the data acquisition speed is slower. The principle is roughly the same as the data collector.

10. How do remote meter reading systems prevent electricity theft?

Most meter reading software has an abnormal electricity consumption query function, including electricity consumption within a specific time period. Check if the electricity consumption is very low or very regular. If the daily electricity consumption is the same, check the hourly electricity consumption each day. If daytime electricity consumption is high and nighttime electricity consumption is low, and this situation occurs continuously, it is preliminarily determined that there is a problem. Then, an inspector can be sent to the site to check for cross-meter wiring or other electricity theft activities.

11. What is remote wireless meter reading for electricity?

Remote wireless meter reading for electricity is generally used for meter reading of large users or meter reading at mobile operator base stations. It transmits data from digital meters to the power company via a wireless data transmission terminal (GPRS DTU). Data can be collected at any time, and the user's electricity consumption status, including voltage and current values, can be monitored.

12. Practical Applications of Remote Centralized Meter Reading Systems?

The GPRS remote power meter reading system consists of a distribution center located at the power bureau and meter data collection points located in residential communities. It utilizes China Mobile's existing GPRS/GSM network, with meter data transmitted through this network.

All meters in the residential community are first connected to a meter concentrator. Residential users' electricity consumption data is transmitted from multi-rate meters to the concentrator via RS-485. The concentrator connects to a GPRS transparent data transmission terminal via an RS-232 port. After protocol encapsulation, the meter data is sent to China Mobile's GPRS data network, which then transmits the data to the distribution data center, achieving real-time online connection between meter data and the data center system. There are actually many more examples. You can learn more about this type of product. Juying Electronics offers similar products. A friend of mine told me that their company has been using their products for several years without any problems. Their performance is quite stable.

13. What are the specific reasons why remote meter reading may fail to obtain data on-site?

This depends on whether it's an individual meter or a cluster of meters. For individual meters, check if there's a problem with the meter's pulse or 485 interface, or if there's a connection fault between the meter and the data collector. For a cluster of meters, check if there's a problem with your data collector.

14. Will a strong magnetic field affect a remote power meter reading system?

It's probably a power line carrier system. Generally, the impact is minimal. Power line carrier systems have a transmitting coil, and a strong magnetic field can saturate the coil, causing the carrier's transmission and reception performance to deteriorate.      

15. If an electricity meter stops working or runs slower than expected after adjustment, can remote meter reading detect this? Can on-site or remote power usage calibration be performed?

If you modified the resistor network, the power company inspectors will use an on-site calibrator or current clamp meter to measure the current value and check if the number of meter pulses corresponds to the current. This will reveal whether you are stealing electricity. Only then can you take the meter to the power company's meter calibration station for further verification. Remote meter reading cannot detect electricity theft, but it can identify wiring problems such as reversed live and neutral wires.

16. Carrier-based remote meter reading system?

The carrier meter and concentrator can communicate directly. Both the carrier meter and the concentrator are equipped with corresponding carrier communication modules.

17. What is the composition of a remote wireless meter reading system for electricity?

This system features fast and accurate data collection and can quickly generate electricity consumption statistics and payment receipts, significantly improving efficiency compared to traditional manual and telephone line meter reading. In addition to accurate and real-time meter reading, it provides equipment management functions, such as alarms (open box alarm, power outage alarm, reverse phase alarm, over-temperature alarm, overload alarm, etc.) and control (power outage for overdue users, etc.). It also provides power outage data protection, allowing meter reading and monitoring to continue for 48-72 hours after a power outage. This system integrates with the mobile company's SMS platform, sending SMS messages to relevant management personnel based on specific alarm content. The system provides rich interfaces, allowing for connection to the power industry's MIS system or secondary development. The meter reading software system uses an SQL database and runs on WIN98/2000/XP and NT operating systems, making it easy to use. There is no limit to the number of users the software can manage. Residential users' electricity consumption data is transmitted from prepaid meters to a meter concentrator via RS485. The concentrator connects to a GPRS DTU via RS232/RS485 serial ports. After protocol encapsulation, the meter data is sent to China Mobile's GPRS data network, which then transmits the data to the distribution data center, achieving real-time online connection between meter data and the data center system. The entire system consists of three main parts: electricity meters and data acquisition terminals, GPRS DTUs, and a monitoring center.

18. 0.4kV system remote meter reading concentrator data collector GPRS?

Situation Description:

Situation 1: Users are concentrated (e.g., in a residential building with 12 meters together). A data collector using RS-485 wiring is installed, and the data collector has a power line communication module installed, but the meters themselves do not have a power line communication module.

Situation 2: Users are dispersed. No data collector is installed, but each meter has a power line communication module installed. The same type of meter is used regardless of whether the users are concentrated or dispersed.

Questions:

(1) Does the electronic meter record the user's electricity consumption in real time?

(2) Is the data collected by the data collector the data stored on the meter? Is the collected data stored or sent directly to the main station?

(3) How often is data collected? Is the collected data real-time user electricity consumption data or data stored on some device?

(4) Since the data collector is used for data collection, why can remote meter reading be achieved in scenario 2 without a data collector installed?

(5) Concentrators are generally installed at the transformer, and the carrier signal is not isolated (it seems). Will the carrier signal leak into the power grid system (other distribution areas)?

(6) Following on from the previous question, how does the data collector identify the carrier signal of its local distribution area?

(7) What is the pulse terminal of the meter used for (it seems it's generally not connected)?

(8) Do some concentrators have cross-data collection functionality?

Does the electronic meter have the function of storing data? If it can store data, it can record the user's real-time electricity consumption, so what is the purpose of the data collector?

Answers:

(1) Generally, electronic meters can record users' electricity consumption in real time, but they cannot save previous data; usually, only the latest data is frozen.

(2) The data collected by the data collector is not the data stored on the meter, but real-time data. The collected data should be stored; whether it can be sent to the main station depends on communication connectivity.

(3) The data collection time can be manually set; the collected data is real-time user electricity consumption data.

(4) After the data collector, there should be a concentrator, which can also collect data.

(5) The concentrator is generally installed at the transformer. The carrier signal is identified by the electricity meter's communication address and will not cross-network.

(6) The data collector identifies the carrier signal of its local area by the communication address.

(7) The pulse terminal of the electricity meter is used to verify the meter's error.

(8) The concentrator itself collects data from the data collector and should have cross-data collection functionality. Ordinary electronic meters have the function of storing data. Data collectors are used to achieve centralized meter reading remotely, which can read meters remotely without having to go to the site to read each meter individually, which is so troublesome!      

19. How to read the meter reading on a remote meter reading system operated by the power company?

For a newly installed meter, the display shows the month and year first, then the time. Which of the last two sets of numbers represents the meter reading?

If you are a resident, you can read the meter reading. This meter should have a rotating display, usually with two display methods: one is a Chinese character display, and the other is a code. The Chinese character display is straightforward; it will show: "Remaining Energy XXXXXXXXX". If it's a code, it's harder to determine, as the codes are usually user-defined. Check the instruction manual for the corresponding remaining energy code. If you are using a centralized meter reading software operated by the power company, that should be sufficient.

20. We've now installed a remote centralized meter reading system here. I'm wondering if it's still possible to steal electricity. I used to bypass the meter. Is that still possible?

Installing a remote centralized meter reading system and whether or not electricity can be stolen are two different things. If you have access to the meter and the four leads at the bottom of the meter are not sealed, you can simply short-circuit the current coil leads inside the meter with a wire. The same principle applies to electronic meters; short-circuit the current sampling output terminal. Please note that you should first use a multimeter to measure to ensure it's not a voltage terminal. Do not short-circuit a voltage terminal; that would be very dangerous!

21. What is the difference between an automatic meter reading system and a GPRS remote meter reading system?

Substantively, there is no difference. Strictly speaking, an automatic meter reading system includes various channels such as direct network cable connection, CDMA, GPRS, 230 load control private network, carrier wave, 485 upload, telephone line, WIFI, and small wireless, while the latter is simply a GPRS method. For relevant information, it is recommended to refer to the protocols (05 State Grid Protocol and 376.1 Protocol) and the master station technical specifications.

22. How to implement a remote wireless meter reading system via GPRS?

The meter is the client, data is collected and sent to the server, and GPRS is just the transmission method. What's the difference between this and a client/server system within a LAN?

(1) The data collection program is definitely the same.

(2) On the hardware side, add a wireless transceiver

(3) Every module to the meter.

(4) Apply for a GGSN port from the operator. Add specific APN data to the SIM card for each meter from the operator to activate the GPRS function.

(5)  Test it!

23. What is a remote meter reading fee?

A remote meter reading project includes two parts: management system construction (computer management system) and hardware system connection (smart meters, communication cables, and construction).

I'm not sure if this fee is collected by the property management company or the developer when you handed over the property. If it's collected by the developer, it's probably unreasonable, as it should be included in the purchase price. If it's collected by the property management company later, it's likely reasonable, because the centralized meter reading system may incur later costs. For example, meter reading requires network support, which generates a certain amount of internet fees each month. The property management company or fee collection department may have to share this cost with the residents, but this fee is generally low, at most 5 yuan per household per month.

24. What does "remote meter reading for Hong Kong Gas" mean?

Remote meter reading is a smart data collection system for water, electricity, and gas meters in residential communities, enabling time-of-use electricity pricing and time-based power consumption control.

25. Does the remote wireless meter reading system utilize GPRS, and what solution is used?

GPRS wireless network provides a simple and efficient communication transmission method for power systems. China Mobile's GPRS system can provide wide-area wireless IP connectivity. Building a remote power meter reading system on the GPRS service platform of a mobile communication company to realize wireless data transmission from meters has the advantages of fully utilizing existing networks, shortening the construction period, reducing construction costs, and facilitating equipment installation and maintenance.

26. What are the uplink and downlink channels for remote meter reading?

The uplink channel for remote meter reading includes GPRS; the downlink channel includes RS485 and power line carrier.

27. How to connect the remote meter reading line between electricity meters?

It involves connecting the communication lines of the electricity meters.

28. Using power lines for internet access enables remote automatic meter reading for water, electricity, and gas. How is this achieved?

It employs carrier wave technology. Since my country's power system uses the PAL system (50Hz waveform), and digital signals are modulated to produce high-frequency waves, the two waves are mixed and transmitted. At the terminal, a frequency divider filters the signal, obtaining the high-frequency wave, which is then demodulated and restored to a digital signal.

For a more comprehensive and efficient solution, explore our meter reading and billing management system to optimize your energy management and billing operations.