Overview: Due to the geographical dispersion of urban water supply, the requirements for collection and control functions are stable, and the safety requirements are relatively high. Generally, the original scheduling method of manual meter reading, telephone report and manual operation on site is adopted. The amount of information collected is low, processing is slow, and delivery is late. The scheduling is at a low level. To ensure that there is no shortage of water and to maintain normal operation, it is impossible to talk about optimal scheduling. In case of leaks and other accidents, it reflects the expansion of dull losses. The remote monitoring and monitoring system of the water supply network can monitor and control the operating equipment on the remote site to realize the data transmission of the network pressure and water flow and the control of the water output of each water plant, which is convenient for timely understanding and control of the remote production operation. , Reduce the failure rate, shorten the maintenance time, reduce the number of water stops. The data collection terminals of the monitoring points of each pipe network can automatically collect real-time data such as pipeline pressure and water flow, and the information is transmitted to the dispatching center of the water company. The dispatching center can find the location of the failure by analyzing the transmitted data, thus When a remote site fails, it can solve the problem in the shortest time. At present, the data communication used in the tap water supply monitoring system can be simply divided into two categories: wired and wireless. Wired communication mainly includes erecting optical cables, cables or leased telecommunications telephone lines, X.25, DDN, ADSL, etc., while wireless Including ultra-short wave communication, spread spectrum communication, satellite communication, GSM short message / GPRS communication, etc. In the remote monitoring system of the water supply pipe network, due to the wide distribution range, large number, and long distance of the monitoring points of each pipe network, individual sites are also located in remote areas, so it is difficult and expensive to install optical cables (cables). Lines need to apply for a lot of telephone lines, and some monitoring points are difficult to reach. Moreover, when using telephone lines, you need to wait for a long telephone dialing process. The speed is slow and the operating cost is high, which is unrealistic. In short, the monitoring system uses a wired communication method with a long construction period, difficult work, and high operating costs, which is not convenient for large-scale use; compared with it, the wireless communication method is very flexible, it has less investment, short construction period, and operation and maintenance Simple and cost-effective. In the monitoring system, wireless communication methods mainly include: ultra-short wave (230MHz) wireless data transmission, spread spectrum, satellite communication, GSM digital cellular communication system, etc. Among them, satellite communication is only used in some special fields due to the high cost of communication. It is popularized; although the spread spectrum communication technology has a high rate, it can only be transmitted within the line of sight, and its application is also limited. The use of ultra-short wave data transmission stations as transmission channels has the advantages of flexible networking, easy expansion, convenient maintenance, and low operating costs. However, because the system works at 230MHz and mostly uses indirect modulated digital transmission stations, this makes the system vulnerable to external interference , Low communication rate, high bit error rate, small data transmission volume, small signal coverage and other shortcomings. After comparative analysis, we chose China Mobile's GPRS system as the data communication platform of the water supply network remote monitoring system. At present, after years of construction by the telecommunications sector, the GSM network has continuously expanded its coverage and has become a mature, stable, and reliable communication network, especially the new GPRS data service launched by China Mobile. GSM / GPRS system can provide wide area wireless IP connection. Building a remote monitoring system for the tap water supply network on the mobile communication company's GPRS business platform to realize wireless data transmission at the network monitoring point has the advantages of making full use of the existing network, shortening the construction cycle and reducing construction costs, and the equipment is easy to install Simple maintenance. system structure: In order to meet the scheduling and command of the production process, a reliable SCADA system is needed. It is generally composed of enterprise production dispatching command center, water plant, pipe network pressure measurement point, meter reading remote measurement and so on. Its functions generally include: data collection control function, data transmission function, data display and analysis function, alarm function, historical data storage, retrieval, query function, report display and printing function, remote control function, network function and so on. The SCADA automatic control system for pipeline network measuring points mainly monitors the distributed pipeline network measuring point sites. The system uses two levels of control, the first level is the central control room of the SCADA system, and the second level is the remote measurement and control terminal GPRS RTU of the pipeline network measurement point site. The central control room is responsible for monitoring, management and control. The site GPRS RTU is responsible for data collection of multiple pipeline network measuring point sites, wireless transmission, and automatic control of pipeline network measuring point pressure. The dispatch center monitors each pipe network measuring point in real time and directs the water output of each water plant. It is the system's information collection and control center. The dispatch center collects the data information of each station, and stores, analyzes, summarizes or prints the information. Through data analysis, timely give alarm information or issue control commands to the site to control the operation of the site equipment, so as to achieve the scheduling and management of the entire system. GPRS RTU (Remote Measurement and Control Terminal) is the basic unit of SCADA system, and acquisition, control and communication are his basic functions. For enterprises with distributed, distributed and networked characteristics, the establishment of SAS / SCADA system is inseparable from the GPRS RTU products inherited from the past. The SCADA system in the urban water supply integrated automation system must have a very important function: to monitor the flow, pressure and other changes of the water pipe network throughout the city in real time and accurately. The GPRS RTU products used in pipe network pressure measurement are designed for this purpose. Due to the simple pressure measurement process of the pipe network, no need for control, and wide distribution, it is required that such GPRS RTU products have the characteristics of simple structure, reliable performance, and low price. 1. Pipeline monitoring point Pipe network monitoring points: Each monitoring point collects data such as pressure and flow through a data collection module, and is connected to a GPRS transparent data transmission terminal through an RS232 (RS485) interface. Devices without a standard communication interface can also use our company with analog , RS6011G GPRS RTU of switch quantity acquisition function. The embedded processor in the GPRS transparent data transmission terminal processes the data, encapsulates the protocol and sends it to the GSM network. Ruishen RS6011G GPRS RTU product introduction 1) Basic principle: Through the RS-485 bus, the digital sensor (an analog output sensor can also be used) and the Ruishen wireless intelligent measurement and control terminal are connected together to form an on-site monitoring unit. Ruishen wireless measurement and control terminal has built-in: CPU module, data storage module, control module, GPRS / CDMA data communication module. Multi-channel analog quantity, switch quantity, relay signal and other data can be accessed on site, and then the field data is directly connected to the remote control center through the GPRS wireless module, and the collected data is sent to the remote database server in real time and stored in the database. Through this system, even in a remote place away from the observation site, it can easily collect and read various environmental elements such as flow, pressure and other data, and truly realize the functions of remote monitoring and data sharing. In addition to remote data collection and real-time monitoring, the system can also realize remote mobile phone alarms and remote control of field devices through user mobile phones. 2) Features: ◎ Integration of collection, transmission and control improves system reliability and reduces costs; ◎ Using ultra-low power consumption and high-performance embedded processor, the data sampling accuracy is less than 2 ‰; ◎ Built-in watchdog, no crash, automatic recovery after disconnection; ◎ Equipped with a variety of interface resources: including analog signal acquisition, switch quantity acquisition, pulse signal input, relay control output, etc .; ◎ Relay can be set for alarm linkage; ◎ Support one-way RS232 / RS485 (only supports MODBUS protocol) user data interface, can be connected to electronic sensors, PLC and other equipment ◎ SMS data transmission or GPRS real-time online transmission method; ◎ GPRS remote online setting and short message remote setting function; ◎ Support terminal to enter sleep mode remotely, and can wake up in multiple ways; ◎ Monitoring center and mobile phone remote control field equipment; ◎ SMS alarm information can be sent to the mobile phone set by the user; ◎ Analog quantity alarm by time; ◎ User-programmable range conversion and alarm upper and lower limit settings; ◎ Built-in industrial clock, accurate time keeping; ◎ Automatic timing report and event triggered report function; ◎ Built-in large-capacity FLASH memory, automatic data recording, support historical data retrieval; ◎ Onboard industrial-grade GSM / GPRS communication module, convenient for users to choose GSM / GPRS networking mode; ◎ Provide user setting software, open interface, easy to connect with group software and other software; 2. Monitoring Center The server applies for a fixed IP address and uses a dedicated line provided by a mobile communication company to connect to the GPRS network. Since the dedicated line can provide higher bandwidth, when the number of monitoring points of the pipe network increases, the center can meet the demand without capacity expansion. After receiving the connection application from the GPRS network terminal, the monitoring center server first performs authentication, and after passing the authentication, accepts the transmitted data and processes it. System functions The central control room is responsible for controlling and monitoring the entire system. Equipped with printer radio, etc. 1. Remote telemetry Measure the status of each station, monitor the pressure of each pressure measurement point, and adjust the switch of the water pump of the water supply system; measurement and control can be carried out by human intervention or according to the setting. 2. Data processing It can store the working status information of each station in the system, and statistically process the information to produce various report outputs. 3. Network connection The system uses MODBUS RTU / ASCII protocol and can be easily connected to other computer systems. 4. Alarm indication The monitoring data volume has upper and lower limit alarm indication function. 5. System parameter input and configuration Enter system parameters, such as inspection cycle, control parameters, alarm limits, calculation formulas, system time, etc., and configure these parameters to form a complete system operation, control, statistics, display, and print parameter database. The entire system operates on the basis of this database. 6. Automatic inspection The central control room automatically patrols the work of n stations and the pumping room. 7. Manual collection It is possible to manually inspect N sites manually to obtain monitoring data. 8. Historical data printing According to the system setting parameters, the operating status data such as system telemetry and remote control are automatically printed. 9. Water supply data statistics It can realize the pressure on N pipe network measuring points and generate reports. 10. Remote diagnosis, remote maintenance, remote upgrade Through the network, remote diagnosis, remote maintenance and remote upgrade of GPRS RTU can be performed. to sum up: Based on the production process of the waterworks, this system proposes a PC-based automatic water supply computer monitoring system design scheme. On-site commissioning proved that the scheme is practical and feasible, which not only guarantees the uninterrupted production of the water plant but also improves the management level of the water plant. The development time of the system is short, the cost is low, and the energy saving benefit is obvious. It is suitable for the technical transformation of water supply dispatching in the majority of small and medium-sized cities.
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