A Study On The Fault Self-diagnosis Technology Of Pipeline Leak Detection Fault Equipment

Pipeline leak detection system is an important guarantee for the safety of the energy storage at the present stage. As the technology has becoming perfect and mature and the function becomes ever stronger, the stability and reliability of the system have received more and more attention. Especially in the more integrated pipeline leak detection system, a tiny default may cause seriously fault of the entire system. Achieving the fault self-diagnosis of field devices and some self-recovery capabilities has important practical significance and practical value in the following respects:maintaining the system leak detection capability as long as possible, guaranteeing the safe operation of the pipeline and achieving rapidly maintaining the faulty device.Based on the study of all kinds of fault types and characteristics of fault sources which occurred in laboratory conditions, this paper improved the design of the remote terminal unit which is a part of the pipeline leak detection system with modular design approach, using dual-processor architecture including ARM9and Cortex-M3processors. On the basis of the original features, the improved RTU will have online self-diagnosis functions through hardware and software design, it can find the failures of power supply, barrier, signal sampling channel, GPS hardware circuit and network communications by real-time monitoring the changes of voltages and currents. Meanwhile, the monitoring program on the server-side which is developed by Qt can display all the fault information about the RTU and make alarm at the same time. What is more, the redundant designs of hardware circuit and control and heart beat communication make the RTU have the ability of self-recovery, such as the recovery of network communications, GPS hardware circuit and signal sampling channel.Under laboratory conditions a variety of field devices self-diagnostic function and part of self-recovery capabilities were tested. And the network connection fault self-recovery capability was tested more than a year. Test results show that the self-diagnosis fault function and part of the fault self-recovery capabilities of field devices in pipeline leak monitoring system were stable and reliable. The expected goals were achieved. The implementation of these techniques provide a favorable technical support in the following respects:quickly and accurately locating the faulty device, achieving rapidly maintaining the faulty device, minimizing the impact on the leak detection system.