Data Collection And Control System Design Based On PC In The Pipeline Protection

The dissertation stems from the item 'the eroded and defended system of pipe under the ground' importantly supported by the Fund of Hubei Physical Science.The pipe transport is vitals of modern industry and country economy. But pipe accident happen continually because the coating quality is not so good when the pipeline was constructed; the coating material becomes ageing more and more, and lack of maintenance since the pipeline was put into commissioning. The Protection effect of Coating is not good. The combination protection of coating and CP(Cathode Protection) system can enhance the effect and protect the pipeline from being eroded.At first the paper introduced the demand of Cathode Protection (CP) , the fundamental of data collection and the development of control system in general. Based on the present theory, the paper presented a security; inexpensive and complete control system for the power supply of CP, which is the heart of pipeline CP system. All the work, such as data collection, communication, display and alarm, can be realized by remote control. The control system consisted of PC, single chip and PWM integration chip. It comprised CP power supply module, data collection module and control module. The PC is in communication with single chip by RS-485 bus. Then the paper introduced the structure of these modules. The power supply module is made of SG3525A, which supply current for pipeline CP. The data collection module is made up of single chip, which collect the nature eroding voltage, protection voltage and current on the spot and transport these data to PC by COM. PC constitutes master control module, which inspects work state of the whole CP system, control the system start and exit, display data out of the single chip. We make man-machine conversation by PC. PC gives voice and light alarm when the power supply is over natural voltage and current.In the design, advanced PC and grown up Single Chip forming data collection system are combined closely. The system is in DCS structure. This data collection and control system can be expanded easily and controlled expediently. It makes the design and use agility. This system provides an efficiency approach for pipeline antisepsis.