On-Line Temperature Checkout System For Key Parts Of Power Transmission Line Based On Infrared Thermal Imaging Technology

In power transmission line, the faults of electrical equipment have a close relationship with heat. On-line temperature checkout for electrical equipment is of great significance to improve the stability of power system, reduce the cost of maintenance and ensure power quality and reliability.In the traditional temperature detection methods for key parts of power transmission line, on the one hand, temperature labels or temperature wax tablets are stuck only when the power supply has been cut off; on the other hand, the narrow scope of measuring temperature makes it impossible to fit to high pressure conditions and realize the on-line monitoring. The laser temperature measuring gun must hit the corresponding target when the temperature is measured, which means the fluttering power transmission line cannot be monitored with light out. In the methd of thermal pellet, the installation is complex, the monitoring sites are fixed and limited, easily to be damaged. Whereas, the infrared thermal imaging technology, with the merits of non-contact measurement, uninterruptible power, needless sampling and the wide monitoring scope, has become a main developing direction of on-line monitoring for key parts of power transmission line.Incooperating the technological project research of Shanxi Province Electricity Company, in view of the weak link that the present power transmission line in the field could not perform realtime examination for temperature, an on-line temperature checkout system for key parts of power transmission line based on infrared thermal imaging technology, bridged on GPRS wireless communication and ARM technology is devised. The main contents are as follows.(1) The superiorities and deficiencies of different temperature measuring methods for key parts of power transmission line are compared and analyzed, and then the necessity and the development both at home and abroad related to our task are described.(2) The design scheme of the on-line temperature checkout system for key parts of power transmission line based on infrared imaging technology are presented.(3) The hardware circuit about the monitoring terminal, including selection of elements, wireless communication, image colletion and storage, system clock, watchdog and reset, JTAG interface and power management module have been finished, which provides a reliable hardware for the control program. (4) The software design of the monitoring terminal are accomplished and its'features and function are inroduced in detail.(5) The whole system are debugged again after the system departmental modules are debugged independently and successfully. Finally, the future research and improving suggestions s are given.Through transmission line on-site operating and testing of power department, the respective technical performance index of the system has met objective requirements.