Answers to common problems of remote meter reading system [29 cases]

1. What is remote meter reading?

The remote meter reading system is designed to realize real-time and reliable remote data reading of three meters (electricity meter, water meter and gas meter). The device realizes the task of remote meter reading with the triple network structure of star / vertical line / radio communication. N MDM meters (e.g. n = 32) are connected with a data collector through the star network. The data collector is connected with the radio station through the vertical line network. A vertical line network can connect m collectors (e.g. M = 128). Therefore, a subnet can connect nm = 32 × 128 meters share a radio station. This is a triple network structure composed of star type, vertical line type and wireless type. The constituent elements of this network structure are electricity meter, water meter or gas meter (hereinafter referred to as three meters), data collector and radio transceiver.

2. Meter reading technology and implementation method?

The meter reading system is mainly divided into three parts: 1 Data acquisition 2 Data transmission 3 Data management, processing, analysis and statistics.

The data acquisition part adopts manual reading, remote automatic meter reading, wireless meter reading and other methods, and adopts appropriate schemes according to the needs of the site. The remote meter reading system is mainly composed of remote meter, collector, concentrator, communicator, UPS power supply, management center computer and system software. The data collector collects the signals of each remote meter and converts them into the corresponding energy consumption. The data concentrator collects the data in each data collector through RS485 bus and uploads the collected data to the management center computer. The management center computer calculates, queries, counts and prints, so as to realize the modern property management of energy consumption of the whole community. The system mainly adopts RS485 bus for communication, data concentrator and data acquisition

According to the database, the communication distance between collectors is less than 1200 meters (it can be extended with repeater).

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

In order to solve the difficulties of meter reading and the disadvantages caused by manual meter reading, the characteristics of meter reading system and related equipment are mainly reflected in:

1. The meter reading personnel and management costs are reduced

The traditional way of meter reading is to send meter readers to the site to copy manually. Each person copies about 2000 households per month, which has high labor intensity, large number of meter reading personnel and high management cost. With automatic meter reading system, a city's water meter reading work 1. What is remote meter reading?

The remote meter reading system is designed to realize real-time and reliable remote data reading of three meters (electricity meter, water meter and gas meter). The device realizes the task of remote meter reading with the triple network structure of star / vertical line / radio communication. N MDM meters (e.g. n = 32) are connected with a data collector through the star network. The data collector is connected with the radio station through the vertical line network. A vertical line network can connect m collectors (e.g. M = 128). Therefore, a subnet can connect nm = 32 × 128 meters share a radio station. This is a triple network structure composed of star type, vertical line type and wireless type. The constituent elements of this network structure are electricity meter, water meter or gas meter (hereinafter referred to as three meters), data collector and radio transceiver.

2. Meter reading technology and implementation method?

The meter reading system is mainly divided into three parts: 1 Data acquisition 2 Data transmission 3 Data management, processing, analysis and statistics.

The data acquisition part adopts manual reading, remote automatic meter reading, wireless meter reading and other methods, and adopts appropriate schemes according to the needs of the site. The remote meter reading system is mainly composed of remote meter, collector, concentrator, communicator, UPS power supply, management center computer and system software. The data collector collects the signals of each remote meter and converts them into the corresponding energy consumption. The data concentrator collects the data in each data collector through RS485 bus and uploads the collected data to the management center computer. The management center computer calculates, queries, counts and prints, so as to realize the modern property management of energy consumption of the whole community. The system mainly adopts RS485 bus for communication, data concentrator and data acquisition

According to the database, the communication distance between collectors is less than 1200 meters (it can be extended with repeater).

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

In order to solve the difficulties of meter reading and the disadvantages caused by manual meter reading, the characteristics of meter reading system and related equipment are mainly reflected in:

1. The meter reading personnel and management costs are reduced

The traditional way of meter reading is to send meter readers to the site to copy manually. Each person copies about 2000 households per month, which has high labor intensity, large number of meter reading personnel and high management cost. With the automatic meter reading system, a city's water meter reading work

It can be copied in a few minutes, and this part of the cost can be reduced by 90% on the basis of the existing cost.

2. It reduces the disadvantages of manual meter reading

Due to the diversity and complexity of on-site conditions, there will inevitably be some situations in the process of manual meter reading, such as less copy, wrong copy, estimated copy, flying copy, missing copy, human favor copy and so on; Less copy, missing copy, flying copy and human favor copy have brought economic losses to the water department,

Miscopying not only increases the workload of the water department, but also brings unnecessary trouble to users. Automatic meter reading can eliminate the above situation. The copy rate, accuracy and accuracy rate are 100%.

3. The function of automatic meter reading system in regulating water price

The adjustment of water price involves every family. The meter reader must read the meter number at the specified time point of price adjustment. At ordinary times, the workload of one month should be completed at a certain time point. This is impossible for the meter reader, even if the number of people is increased. This is bound to be completed in a few days around the price adjustment time point. In this way, users will pay more, which is not conducive to social harmony. The automatic meter reading system can be accurate. As long as the system adds an instruction, it can complete this work. The water department and users have no complaints.

4. Function of automatic meter reading system in water saving

4.1 improvement of pipeline leakage rate

The water supply pipeline will leak or be damaged due to various reasons. If there is no scientific and technological means, it can not be found or found in time, and the tap water will be wasted. The automatic meter reading system can give an alarm in time through the real-time analysis of the system line loss (i.e. the total line table or assessment table minus the total user table) and the sudden change of flow, and the maintenance personnel can deal with it at the first time, Reduce the loss of tap water and improve the leakage rate. The loss of the main pipeline in an hour is generally between tens of tons and hundreds of tons, and the social and economic effects can be found in time.

4.2. Abnormal phenomena of water use such as running, dripping and leakage shall be detected as soon as possible

There are many cases of abnormal consumption of users, such as toilet leakage, water pipe seepage, water pipeline leakage of solar water heater and other phenomena, resulting in large water consumption. If these problems can not be found in time, disputes may occur with users at the time of water fee settlement. The automatic meter reading system will quickly find problems and deal with them in time to reduce water loss by comparing the 24-hour real-time reading of the water meter (especially the continuous generation of water at night or in non water use time) with the consumption of the previous month. According to experience, the loss of a toilet in a month is less than a few tons and more than a dozen tons; The concealment of water leakage in the water delivery pipeline of solar water heater is more than 1000 tons of water a month. It is of great significance to find it in time. Another phenomenon is that the water consumption is too large or too small due to the damage of the water meter. Through the above analysis methods, the system can find out in time that there will be contradictions between too many or too few water departments and users, and take the initiative to solve them in time, with immeasurable social benefits.

5. The role of automatic meter reading system in social stability

Compared with the traditional meter reading method, the automatic meter reading system can well avoid the following problems:

5.1. Privacy issues: users do not want to be disturbed due to the improvement of residents' living standards, the increasing value of family property and the increasing emphasis on privacy.

5.2. Water fee allocation: due to the difficulty of household meter reading, some water departments simply copy the general meter, while the sub meter allows users to copy, and the insufficient part is shared by users, resulting in suspicion among neighbors and uncoordinated payment, resulting in serious arrears of water fee;

5.3. Burglary: many criminals use meter reading as an excuse for burglary and robbery, affecting social stability.

6. The role of meter reading system in management refinement

The system can analyze each user, each unit, each building, each community and each pipeline by hour, day, week, month, quarter, year or any time period and form corresponding curves, which provides real-time and reliable data for water department dispatching system, supply system and production system, reduces blindness in work and reduces cost, It provides a scientific basis for the company's decision-making.

7. Social benefits

The automatic meter reading system can improve the ability and level of active service of water management departments and deal with possible problems in time through scientific, technological and automatic means. In addition, the human and material resources saved by the automatic meter reading system can help enterprises improve service efficiency and service content, and better realize harmonious coexistence with users, Create a good social image and social benefits for the water authority.

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

Firstly, remote meter reading must be supported by communication channel and communication protocol. At present, common communication protocols include DL / t645-97, DL / t645-2007, gdw130, etc. When your electronic watt hour meter has valve control function and can support corresponding operation instructions, you can realize the power-off function by issuing the switch off command to the meter end meter.

5. What is the advanced technology of remote meter reading system?

Remote automatic meter reading system has no relatively fixed way and concept. In practical application, it is usually the comprehensive use of a variety of communication technologies to achieve the most ideal goals, such as saving cost and improving reliability. At present, the most commonly used mode is electric energy meter ← (485 communication) → collector ← (power line carrier communication) → concentrator ← (GPRS wireless communication) → power consumption management system. Various methods have their advantages and disadvantages. It's impossible to start without being advanced first.

6. What is wireless remote meter reading?

Wireless remote meter reading refers to the combination of modern mobile communication technology and power system technology, which transforms the traditional manual meter reading mode into direct transmission of power consumption data through wireless network. It is also one of the typical applications of Internet of things, wireless city and smart city. According to the mobile staff, the wireless meter reading service actually realizes the accurate and timely collection and processing of water, electricity, coal and other public utility data remotely through the wireless module loaded on the instrument recording water meter, electricity meter and other public utility data. These public sector special devices regularly send the collected data to the intelligent management platform through the wireless communication module, so as to realize the function of remote meter reading.

As an important application of the combination of Internet of things technology and urban public utilities, China Mobile Shanghai company has upgraded the wireless remote meter reading service in the whole city. About one million household users' meters have been upgraded. The staff of the power company use the ubiquitous mobile network to realize remote automatic meter reading, which not only greatly saves the cost of manual meter reading for power enterprises, At the same time, it also prevents Shanghai citizens from being disturbed by door-to-door meter reading. Compared with the traditional manual meter reading service, remote wireless meter reading not only has the advantages of avoiding disturbing users and greatly saving the cost of manual meter reading, but also can solve the constraints of wired line access restrictions in some places and reduce the dependence on lines, so as to reduce the cost of system construction, which is very in line with the goal of the government and public institutions to improve user experience and reduce costs. After the full implementation of wireless meter reading, users can more accurately know their use of meters, and the power department can also collect users' daily power consumption data. In the future, users are expected to check how much electricity they use every day through the Internet or hotline, and enjoy open and transparent services. Moreover, the cost of upgrading is borne by the power company. Since the meter itself needs to be replaced regularly, the investment in it has not increased much from the original, and there will be no additional cost for residents.

7. Solution of three meter centralized reading system for water and electricity?

Solution of three meter centralized reading system for water and electricity

1. Features of wireless remote meter reading system:

◆ strong real-time performance: due to the real-time online characteristics of GPRS, the system can receive and process the data of multiple / all data acquisition points synchronously without time delay and round inspection. It can well meet the requirements of the system for real-time data acquisition and transmission.

◆ remote control of electricity meter equipment: remote control of electricity meter equipment, parameter adjustment, switch and other control operations can also be realized through GPRS two-way system.

◆ low construction cost: due to the use of GPRS wireless public network platform, only the equipment can be installed, and there is no need for special wiring for remote meter reading. It has less investment in the early stage, quick effect and low cost of upgrading and maintenance in the later stage.

◆ wide range of centralized reading: GPRS covers a wide range, and the control and management of centralized reading can be completed within the coverage of wireless GSM / GPRS network. Moreover, there are no restrictions on capacity expansion and access locations, which can meet the access needs of mountainous areas, towns and cross regions.

◆ large transmission capacity of the system: the distribution data center shall maintain real-time connection with each meter data acquisition point. Due to the large number of data acquisition points of electric meter, the system is required to meet the needs of sudden data transmission, and GPRS technology can well meet the needs of sudden data transmission.

◆ high data transmission rate: the data transmission volume of each meter data acquisition point is within 10kbps. In theory, the transmission rate of GPRS network can reach 171.2kbit/s. At present, the actual data transmission rate of GPRS is about 40kbps, which can fully meet the demand of data transmission rate (≥ 10kbps) of the system.

◆ low communication cost: the monthly billing method is adopted, which is less than 20 yuan per month, which is fully sufficient for the GPRS communication cost of a centralized controller, and the operation cost is low.

There are also system equipment, reference quotation, system software, etc.

8. Excuse me: how to connect the power remote meter reading line?

The 485 line of the electricity meter is connected to the centralized meter or DTU, a to a and B to B.

9. What are the original working circuit, construction process and wiring precautions of remote meter reading system?

The key equipment of remote meter reading is divided into collector and concentrator. The collector is generally used for civil use such as corridor. It is designed to read 32 meters at a time. 485 is used for downlink communication, and power line carrier is used to communicate with the meter. G network is used for uplink, that is, GPRS, C network, Ethernet, etc. to communicate with the master station. In addition, infrared is used for maintenance, The working principle is generally to send a communication to the electricity meter every 5 minutes. The electricity meter feeds back the relevant data to the collector, which stores the data, and then waits for the master station to call for measurement or active uplink. The latest communication protocol is downlink dlt2007, and the uplink behavior is Q / GDW 376.1-2009.

Centralization is generally used in large-scale centralized user groups. 1024 meters are read at one time. Power line carrier and meter communication are basically adopted. The acquisition speed is slow, and the principle is roughly the same as that of the collector.

10. How to prevent stealing electricity in remote meter reading system?

General meter reading software has abnormal power query, including the power in a specific time period to check whether the power is very small or regular. If the electricity consumption is the same every day, check the whole hour electricity consumption every day. If the electricity consumption is more during the day and less at night, and this situation occurs continuously, it is preliminarily determined that there is a problem, and then let the inspector go to the scene to see if there is cross meter wiring or other electricity stealing behavior.

11. What's the matter with remote wireless meter reading?

Power remote wireless meter reading is generally used for meter reading by large users or base stations of mobile operators. The data of digital meter is transmitted to the power supply company through wireless data transmission terminal (GPRS DTU), which can read the data at any time and monitor the power consumption status of users, including piezoelectric current value, etc.

12. Practical application of remote centralized meter reading system?

GPRS power remote meter reading system consists of the distribution center located in the power bureau and the meter data acquisition point located in the residential area. Using the existing GPRS / GSM network of China Mobile, the meter data is transmitted through the GPRS / GSM network of China Mobile.

All meters in the residential area are first connected to the meter concentrator. The power consumption data of residential users is transmitted from the multi rate meter to the meter concentrator through 485. The meter concentrator is connected with the GPRS transparent data transmission terminal through RS232 port. The meter data is sent to the GPRS data network of China Mobile after protocol encapsulation, and the data is transmitted to the distribution data center through the GPRS data network, Realize the real-time online connection between meter data and data center system. In fact, there are many, many. You can learn about this product. Juying electronics has such similar products. A friend of mine said that their company has used their products for several years and there has been no failure so far. The performance is quite stable.

13. What are the specific reasons why remote meter reading can't be counted on site?

It is divided into individual meters or most centralized meters. The reason for individual failure to copy depends on whether there is a problem with the pulse or485 interface of the meter, or whether there is a fault in the connection between the meter and the collector. In most cases, it depends on whether there is a problem with your collector.

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

Power carrier, right? Generally, it has little impact. The power carrier has a transmission coil, the strong magnetic field will be saturated, and the carrier transceiver performance will become worse.

15. The electricity meter does not go after debugging, or it goes slower than the actual situation. Can the remote meter reading be found out? Can you conduct on-site or remote power calibration?

If you change the resistance network, the electric power bureau will check the current value with the on-site calibrator or current clamp meter, and see whether the number of pulses of the electric meter corresponds to the current, you will know whether your home steals electricity, and then you can get it to the electric meter calibration desk of the Electric Power Bureau for specific verification. Remote meter reading can't find out whether electricity is stolen, but it can judge the wiring mode of reverse connection of live line and zero line.

16. Carrier remote meter reading system?

The carrier table and concentrator can communicate directly. The concentrator of carrier meter box is equipped with corresponding carrier communication module.

17. Composition of power remote wireless meter reading system?

The system has the characteristics of fast and accurate data collection, rapid generation of power consumption statistics and analysis, payment documents and so on. Compared with the traditional manual meter reading and telephone line meter reading, the efficiency is greatly improved. In addition to accurate and real-time meter reading, it also provides equipment management functions, such as alarm: unpacking alarm, power failure alarm, reverse phase alarm, overtemperature alarm, overload alarm, etc; Control: switch off the arrearage users. It also provides power failure data protection function, and can still read and monitor meters within 48-72 hours of power failure. Combined with the short message platform of mobile company, this system can send short messages to relevant managers according to specific contents in case of alarm. The system provides rich interfaces, which can be linked with the MIS system of the power system or secondary development. The system database of meter reading software is SQL database, which runs on the operating systems of WIN98 / 2000 / XP and NT and is easy to use. There is no limit to the number of users that the software can manage. The power consumption data of residential users is transmitted from the payment rate meter to the meter concentrator through RS485. The meter concentrator is connected with GPRS DTU through RS232 / RS485 serial port. The meter data is sent to the GPRS data network of China Mobile after protocol encapsulation, and the data is transmitted to the distribution data center through GPRS data network, so as to realize the real-time online connection between the meter data and the data center system. The whole system consists of watt hour meter and data acquisition terminal, GPRS DTU and monitoring center.

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

Description:

In case 1, the users are relatively concentrated (for example, the unit building of the community, 12 meters together), the collector is installed, 485 wiring is adopted, the collector is installed with power carrier communication module, and the meter is not installed with carrier communication module; Case 2 when the users are scattered, the collector is not installed, but the power carrier communication module is installed on each meter. Whether users use centralized or decentralized meters, they all use the same meters.

Question: 1. Does the electronic meter record the user's power consumption in real time?

2. Is the data collected by the collector the data stored on the meter? Is the collected data stored or directly sent to the master station?

3. How often is the data collected? Is the collected data real-time data of users' power consumption or data stored on a device?

3. Since the collector is used to collect data, why can remote meter reading be realized without installing the collector in case 2?

4. Concentrators are generally installed at the transformer, and the carrier signal is not isolated (as if), will the carrier signal flow into the power grid system (other stations)?

5. Then, how does the collector recognize the carrier signal in this station area?

6. What is the purpose of the pulse terminal of the meter (it seems that it is generally not connected)?

7. Are some concentrators with cross acquisition function?

Does the electronic meter have the function of storing data? If you can store data and record users' real-time power consumption, what else do you use a collector for?

answer:

1. General electronic meters can record users' power consumption in real time, but they can't save the previous data. Usually, they only freeze the last data.

2. The data collected by the 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 master station depends on whether the communication is smooth.

3. The data acquisition time can be set manually, and the collected data is the real-time data of users' power consumption.

3. There should be a concentrator after the collector, which can also collect data.

4. The concentrator is generally installed at the transformer. The carrier signal is identified by the communication address of the electric energy meter and will not cross the network.

5. The collector identifies the carrier signal of the station area by the communication address.

6. The pulse terminal of the electric energy meter is used to check the error of the electric energy meter.

7. The concentrator itself collects the data of the collector and should have the function of cross acquisition.

Ordinary electronic meters have the function of storing data. Collectors are used to realize remote centralized meter reading. They can read meters remotely without going to the scene to read meters one by one. How troublesome it is!

20. How to read the meter from the remote power supply bureau?

For the new electricity meter, first the month and year, then the time, and the last two groups of numbers. Which is the number of electricity meters?

If you are a resident, look at the degree of the meter. The meter should be displayed in turn. Half of it has two display modes, one is the number Chinese character prompt, and the other is the code Chinese character. It is very intuitive. It will display: the remaining electricity XXXXXXXX. If it is a code, you can't be sure, because the codes are basically self-defined. Look for the instructions to see what the remaining electricity code is, You can know that if it is the power supply bureau, it will be OK to use the centralized meter reading software to copy the meter data soon!

21. Now we have set up the remote centralized meter reading system here. I don't know if I can steal electricity. In the past, I bypassed the meter. Is it ok now?

The installation of remote centralized meter reading system is different from whether you can steal electricity. If you may contact the meter and the four lead ends at the lower part of the meter are not sealed, just short-circuit the lead out end of the current coil in the meter with a wire. If it is an electronic meter, the reason is similar. Short circuit the current sampling output terminal. Please pay attention to measure it with a multimeter to judge whether it is not the voltage terminal. Don't short connect it to the voltage terminal, which is very dangerous!

22. What is the difference between automatic meter reading system and GPRS Remote Meter Reading System?

It doesn't make any difference. Strictly speaking, the automatic meter reading system includes network cable direct connection, CDMA, GPRS, 230 load control private network, carrier, upload 485, telephone line, WiFi, small wireless, etc., and the latter is only GPRS. For relevant information, it is recommended to see the regulations (05 Guodian regulations and 376.1 regulations) and the technical specifications of the master station.

23. How to realize remote wireless meter reading system through GPRS?

Table is the client, data collection to the server, GPRS is only a means of transmission. Is this different from the client / server in the LAN!

1. the collection procedure as like as two peas.

2. In terms of hardware, add a wireless transceiver module at the meter end.

3. Apply for GGSN port from the operator

5. Go to the operator and add specific APN data to the SIM card at each meter end to enable GPRS function.

6. Test it!

24. What is the remote centralized reading fee?

Remote centralized reading project includes two parts: management system construction [computer management system] and hardware system connection [intelligent meter, communication cable and construction].

I don't know whether you charge for the property or the developer when delivering the house. If it is collected by developers, it should be unreasonable, because the house payment when buying a house should be included. If it is collected by the later property, it is likely to be reasonable, because the centralized meter reading system may incur late fees. For example, meter reading needs network support, and a certain amount of network fees will be generated every month. It is likely that the property or charging department will share the fees equally with the owners, but the fee is generally not high, with 5 yuan per household per month.

25. What does Ganghua gas remote meter reading mean?

Remote meter reading is a wireless water, electricity and gas meter intelligent acquisition system used in the community to realize time-of-use electricity price statistics and time-of-time electricity control.

26. Does the remote wireless meter reading system have GPRS application and how to adopt the solution?

GPRS wireless network can provide a simple and efficient means of communication and transmission for power system. China mobile GPRS system can provide wide area wireless IP connection. Building a power remote meter reading system on the GPRS service platform of mobile communication company to realize the wireless data transmission of meter data has the advantages of making full use of the existing network, shortening the construction cycle and reducing the construction cost, and the equipment installation is convenient and the maintenance is simple.

27. What are the upstream and downstream channels of remote meter reading?

The upstream channel of remote meter reading is GPRS; The downlink channel has RS485 and power line carrier.

28. How to connect the remote meter reading line between the meter and the meter?

Is to connect the communication line of the meter

29. Using the power line to access the Internet, it can realize remote automatic meter reading of water, electricity and gas. How is it realized?

The carrier technology is adopted, because China's power system adopts PAL system, i.e. 50Hz waveform. The digital signal is a high-frequency wave after modulation. The mixed wave of the two waves is transmitted to the terminal, and then filtered by a frequency divider to obtain the high-frequency wave, which is demodulated and restored to a digital signal.