In recent years, with the progress of technology and capital investment, most water supply enterprises have set up water supply data monitoring and control system (SCADA), and have realized the monitoring of water source and raw water delivery systems, the monitoring of water purification structures and process equipment As well as water supply network pressure measurement and other functions. Some water supply enterprises have also established "call center" hotline telephone network and pipe network geographic information system (GIS). The establishment of the above-mentioned system can timely monitor the operation of water supply equipment and discover the accident of the pipe network, and greatly improve the water supply service level. Limited to technology, equipment and system design concepts and many other reasons, the management and operation of pipe network scheduling control is also limited to manual operation. Water pressure telemetry and accident information acquisition, acquisition and judgment have been achieved information and automation, but the valve opening and closing must also rely on the operator to the scene manually. This mainly has the following deficiencies: ①transient changes in water supply network conditions, real-time optimization of pipe network operations by manual adjustment of the site is almost impossible to achieve. ② In order to ensure the safe operation of the water supply system, in the event of a major water supply accident, several important valves in the pipe network need to be repeatedly regulated repeatedly and manual operation is not competent. ③ Obtaining and judging from the accident information of the pipe network to control the valve on the artificial site, there will be a delay of about 1 hour according to the scale of the city, the power of repairing and traffic conditions. This will cause the loss of the accident to expand, causing problems. ④ current network scheduling mode on the client can not be achieved timely and reasonable regulation and control. 2. The significance of the remote control of pipe network valve Pipe network valve is an important water supply system facilities, play transport, shut down, adjust the water supply flow, pressure and change the direction of pipe network regulation and control, water supply and drainage system and pipe network Repair, maintenance, transformation of the important guarantee measures. Pipe network valve timely realization of the above-mentioned functions have a direct impact on water supply safety and service quality of the water supply industry. Importantly, when a major failure of the water supply system and the handling of large squib accidents, pipe network valve if not timely and effective regulation will delay the timing of the accident, with serious consequences. Scheduling and real-time regulation of water supply pipelines must first solve the problem of remote control valves, pipe network, a number of important valves and key valves can be timely and effective regulation of a direct impact on water supply safety, control center in the pipeline directly to the important valve remote control operations To ensure the safe and normal operation of water supply system is of great significance. 3. Implementation of the program Water supply system to achieve scientific scheduling is the key to increasing control means and work patterns and management system innovation. In view of the fact that the valve can not be dealt with in time in accordance with manual operation and control, which is unfavorable to the water supply management and service, after inspecting and analyzing the project objectives, equipment working environment, RTU, electric actuator and other technical parameters, The technical scheme of using the existing pipe network RTU equipment to carry out telemetry and remote control of the important valve in the pipe network is proposed, and the accident of the pipe network and the change of working conditions are dealt with in time so as to improve the water supply management and service level. 3.1 Technical Solution ①Remote Communication / Control Terminal Selection The remote control system of the pipe network valve is compatible with the existing SCADA system and can fully utilize existing equipment, wireless spectrum and other resources. RTU selects the MOSCADRTU used in the existing SCADA system and re-writes the corresponding control program according to the control target. ② PC configuration programming in the dispatch center host computer set the control window and the operation screen, based on shortwave radio wireless SCADA system real-time detection of valve-side operating parameters, through the command control MOSCADRTU valve telemetry, remote control. ③ actuator selection pipeline valve installed in a humid environment, valve wells, poor working environment. In order to ensure the control reliability and equipment safety, the electric head with IP68 degree of protection and the valve with high reliability are selected as the executing agency to achieve the normal working requirements. ④ power supply units in the vicinity of the controlled valve to find the appropriate power / lighting power supply as a controlled valve system power supply. According to the power of choice electric head drive power supply. In the case of conditions permit, as far as possible the choice of power supply as a working power supply. ⑤ attached to the timely grasp of the instrument to control the valve and the effect of the situation, the downstream pressure sensor installed in the valve. Acquisition of pressure signals transmitted through the RTU to the SCADA system, usually used as a pressure measurement point. 3.2 System Security Measures To ensure the safety of the equipment and personal safety, the technical measures adopted in the program design and project implementation are as follows: ①Power Supply Safety Due to the special work environment, the power supply box is designed with a leakage protector. Electric head power supply is controlled by RTU only when remote control operation is carried out. The equipment inside the valve well is usually isolated from the mains. ② valve wells and covers design Selection of a good external environment is an important factor in the safe operation of equipment. Although the design and selection of equipment to meet the "immersion environment" work, in order to improve system reliability, the design of the valve wells telecommunications waterproof covers to prevent rain invade the valve wells, the implementing agencies to provide a good external working environment. The valve well design considered infiltration of the well chamber water infiltration, well room with seepage pits. Well designed indoor reed pipe installation level switch, if for some reason the valve well water / seepage, the water level reaches the set height, RTU will send a water level alarm message prompt maintenance. (3) The remote operation of safety valve in operation of pipeline network adopts the intermittent operation mode of "moving-stopping-moving" to reduce the influence of pressure fluctuation caused by valve regulation on the safe operation of the pipeline network. The control process by the "dispatch end host - on-site RTU" jointly implemented under the control of the program. ④ operating authority and system management The key valve is an important water supply and equipment operation, in order to prevent misuse, scheduling center PC with login password and management authority, and developed a corresponding management practices, such as: the valve remote control system operation Implementation of the operating system, the valve on a regular basis to prevent equipment from opening and closing rust, according to seasonal timing connected to the electric head built moisture dampness heating devices. 4. Actual application and operation effect According to the technical scheme and implementation plan, the key valve of DN800 pipe network of Jiangsu Textile Machinery has been transformed. In October 2005, the commissioning of the system was completed and put into operation. The production operation in the past year shows that the system is stable and reliable and has achieved the expected purpose. 4.1 Production scheduling regulation The valve is an important regulatory valve in the pipe network, played a major role in regulating water supply areas such as Shiyuan Waterworks and Shifu Waterworks and regulating the pressure of partial pipelines in the West Area. Valve remote control system put into use, the dispatch center according to production needs and optimization of scheduling programs at any time the valve regulation and control operations, to achieve the purpose of optimizing production. 4.2 Responding to Major Water Supply Accident 20:58, the evening of July 1, 2006, was affected by major turbulence in Henan Power Grid. Waterworks such as Shiyuan, Shifo and Dongzhou all were discontinued and all pressure measurement points were under-pressured. When the grid normal water supply system is gradually restored, due to the large-scale water stoppage in the pipe network, gas accumulates in the pipe and the pipeline pressure is low. In this case, for safety reasons, dispatching center remote operation of the provincial textile machinery remote control valves, with Beijing Guanggu Road and other valves manual adjustment, according to the pressure dispatching waterworks in turn drove the water supply system to be restored in a short period of time. 4.3 Responding to Major Accidents in Pipeline On June 19, 2006 at 14:10 on June 19, 2006, DN1200 raw water pipe of China-France water supply plant exploded near toll station of Yellow River Bridge and the water supply plant was unable to maintain normal water supply. According to the contingency plan, the dispatch center has repeatedly operated the remote control valve of the provincial textile machinery for long-distance operation. In line with the valve adjustment of Central Plains Road, the water supply area of ​​Shiyuan and Shifu two plants was changed and the central and northern urban areas were supplied with insufficient water supply, District pipe network normal pressure. The above measures have basically not affected the water supply in the urban area, and the water supply pressure in the pipe network is balanced. 4.4 Expanding Applications Remote control of key parts and key valves in the pipe network is an important technical guarantee for optimizing the operation of water supply system and improving the safety and reliability of water supply. It is also an innovation of the current dispatching mode of pipe network operation. As the pipe network valve remote control system plays a key role in the above applications, it is decided to Navigable Road DN1000, Huashan Road DN1200, Agricultural Road DN800 and other key valves in all six of the key remote control system transformation is currently under implementation . 5. Application Prospect Test program selected RTU, electric head device combination mode with high reliability, powerful features such as the scale of application may consider the possibility of further improvement. Reduce system costs Test application of remote communication / remote control device based on short-wave communication RTU. Although powerful, single station equipment costs high. You can try to select a function module with data acquisition and remote control function based on wireless digital public network, such as GPRS-RTU, CDMA-RTU, etc., in order to reduce the single station construction costs. ② power bottleneck problem Pipe network valve installed in the municipal road underground, the appropriate power / lighting mains power may not be able to get. In the key valve needs to be remote control and can not solve the mains power supply, you can choose to DC power supply, high output torque, low speed electric head, the power of lead-acid batteries. Selection of electric vehicles commonly used 48V14AH lead-acid battery pack to a month for the charging cycle, calculated during the charging cycle can be completed more than 50 times fully open - fully closed valve operation to meet functional requirements. By strengthening the battery charge maintenance management, the valve can be remotely controlled without mains power. ③ internal large-capacity clean-up users of the pool can be scheduled to regulate the network conditions according to their regular remote control of water supply, in order to make full use of users of the pool on the pipe network "peak regulation" function. 6. Conclusion Pipe network valve remote control, timely response to accidents and improve the level of water supply management services; the application of key and important valve size can achieve real-time optimal operation of the pipe network, reducing system water supply costs, is to achieve the "scheduling automation" important Technical means and measures are also breakthroughs and innovations in the existing operation and scheduling modes.
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