Research For Icing Monitoring Of Power Transmission Line Based On Composite Insulator Inlined Optical Fiber Bragg Grating

Ice on overhead power line will reduce stability of power system and cause huge economic losses. Traditional ice monitoring on power line is mainly depended on artificially regular inspection, this kind of monitoring method is not only inefficient but also costly. The development of modern communication technology makes it possible to do real-time ice-monitoring to power line. In order to make power system run reliably, it is essential to strengthen ice-monitoring on power line for timely scheduling and decision support.The development of computer communication technology and modern control theory afford powerful technical support for online monitoring of power system, it promotes online monitoring equipment to update quickly. So far, many domestic research institutes and companies are taking more and more energy to do research on ice monitoring, which makes great progress to theory of ice monitoring. They explore a lot of practical monitoring systems and get good running effect in demonstration lines at a very short time. This brings about good economic benefits.Ice on-line monitoring system can get real-time information about meteorological environmental data, insulator string obliquity, wire tension change, wire vibration information by remote,real-time measurement and then gives analysis, this helps administrator know about detail field information of ice on power line. These information facilitate administrator to give relative evaluation to ice condition, supply seasonable measures for eliminating ice to special section of power line, it avoids power accidents effectively such as breakage of ground wire, hardware damage, insulator rapture and increase safety and reliability of power system at the same time.This paper simulated strain test to Optical fiber Bragg grating composite insulator in the laboratory, proved tension measuring principle of Optical fiber Bragg grating sensor, analyzed the linear relation between centric wavelength and tension,measured tension in two conditions, which one is with wind oscillation and ice on transmission line, the other is without wind oscillation and without ice, deduced the procedure of calculating ice thickness by catenary wire ice model. At last, the article compared the difference between this method and the way that had been used by other similar article in ice thickness calculation,analyzed the advantages of this type of calculating method It gives important technical support for fault early warning and aided decision making.