GPRS RTU water supply SCADA system

　　SCADA (supervisory control and data acquisition) system, namely data acquisition and monitoring control system. SCADA system is widely used in many fields, such as data acquisition, monitoring and control, process control and so on. At present, countries are actively building a "Digital Earth". More than 40 large and medium-sized cities in China have launched the "digital city" project. More than 70 cities across the country have completed the "digital city" plan. During the Tenth Five Year Plan period, more than 200 "digital city" projects will be launched, with a total investment of more than 10 billion yuan. The realization of "digital city" and "digital province" depends on the digitization of land and resources, water conservancy, electric power, transportation, agriculture and forestry, environmental protection, urban information management and other industries.

　　GPRS wireless data communication system has made a positive contribution to urban informatization. At present, it has been widely used in urban intelligent transportation, street lamp monitoring, water, gas and central heating pipe network measurement and control

　　The characteristics of urban water supply enterprises are: distributed, distributed, networked and fully open. In order to meet the dispatching and command of the production process, a reliable SCADA system is needed. It is generally composed of enterprise production dispatching command center, branch measurement and control station, pipe network pressure measuring points, meter reading and telemetry, etc. Its functions generally include: data acquisition and control function, data transmission function, data display and analysis function, alarm function, historical data storage, retrieval and query function, report display and printing function, remote control function, network function, etc.

　　1. System structure

　　The SCADA system of urban tap water can be divided into five parts: water division control center, water plant sub control center, pipe network pressure measuring station, pipe network pressure station and water source well monitoring station. Its structure is shown in the block diagram:

　　2. Basic measurement and control unit

　　RTU (remote measurement and control terminal) is the basic unit of SCADA system, which has the functions of acquisition, control and communication. SCADA system in urban water supply integrated automation system must have and very important functions

　　One function is to monitor the pressure changes of the tap water pipe network all over the city in real time and accurately. In addition, it is also possible to monitor the three data information of flow, residual chlorine and turbidity. According to the production characteristics of tap water enterprises, RTU products suitable for different applications are developed. The universal integrated RTU series products can be widely used in urban water supply SCADA system and meet the different requirements of different users. By entering different types

　　The control program can form different types of RTU, such as pipe network pressure monitor, pipe network midway pressurization station controller, water source well controller, water plant monitoring substation controller, remote meter reading controller and so on.

　　3. Communication system

　　GPRS, GSM and other wireless communication channels are adopted for the data transmission of China's mobile terminals, and the data transmission channels of GPRS / USB are required to meet the needs of Chinese mobile users. The production process automation monitoring system (SCADA) of urban water supply company includes: water division control center, multiple water plant sub control centers, multiple water plant monitoring sub stations, multiple water source well monitoring stations, multiple pipe network pressurization stations and multiple pipe network pressure measurement stations. Except for the centralized monitoring sub stations in a water plant, other monitoring stations are scattered in various areas of the city. Due to the wide coverage of GPRS network, high communication rate and good stability, GPRS wireless data transmission system has significant advantages:

　　Real time transparent transmission, rapid and accurate data transmission;

　　Calculate the cost according to the flow more reasonably to make the operation cost cheaper;

　　Wide network coverage, convenient distribution and simple expansion;

　　Strong system compatibility, simple and rapid networking;

　　High safety; Low maintenance cost.

　　4. Database

　　The data of tap water SCADA system takes the database of water division control center and the database of water plant sub control center as the core. The two databases have similar structures, but different emphases. The database structure is shown in the figure below:

　　5. System software

　　The SCADA system of tap water needs to be supported by a software system. The software system should not only have industry characteristics, but also have flexible configuration function. The software of tap water SCADA system is divided into two parts: the control center of the water department

　　Software system software and water plant sub control center system software. They have similar structures, but different emphases. The former focuses on statistics and query, while the latter focuses on alarm and control. Their structure is shown in the figure:

　　Beijing Juying soaring Electronics Co., Ltd., located in the science and trade building of Shangdi Information Industry Park, Haidian District, Beijing, is mainly engaged in industrial automation control, remote data acquisition and other businesses. The company's business areas cover product R & D, manufacturing and automation integration. The products are widely used in industrial automation production, GPS monitoring of civil vehicles, on-line monitoring of environmental protection, and monitoring of urban gas, water, heat, electricity and other pipe networks. It is widely used in many fields such as industrial control oil and gas fields, municipal administration, water conservancy, electric power, coal mining, agriculture, chemical industry, communication and so on, such as water supply automation, urban water treatment, pipe network measurement and control, water regime measurement and reporting system, atmospheric environment and water quality monitoring, telemetry and remote control of power system, air defense system monitoring and so on.