The Research On The Practical Application Of Fiber-optical Protection For Transmission Lines

Channel as the signal transmission path of the pilot protection of HV and EHV transmission lines plays a very key role. At present, high frequency channel and optical fiber channel are widely used. When line fault occurs, the clear impact on high frequency carrier wave channels may easily result in tripping missing or mal operation of the pilot protection. Moreover, because of multi-links, single mode, and invisibility of fault, therefore the work of maintenance is huge. While the application of fiber protection can avid many problems as described above, and fiber protection is more and more widely used in high-voltage grid.The article, starting form the principle of high-frequency protection, analyses the main problems in recent years during operation of the high-frequency protection, mainly researches on the high frequency carrier wave channels, points out the shortcomings of these, and provides technical reform measures such as using fiber channel to improve reliability of operation.Then in this article, the characteristic of pilot protection and the connect ways of optic-fiber channel with relay protection devices is introduced, superiority of fiber-optical protection for the high-frequency protection is analyzed, as well as explained the principles of fiber pilot protections of artesian and allowable. According to the fundamental disposition and the actual operation status of the protection of 220 kV lines in Sihui substation, it put forward the option of reforming.Later, it focuses on the practical application of optical fiber in the protection of the problems encountered in its solution, and it can be a good guide to the application of fiber protection of 220 kV lines in Sihui substation.Finally,the plan for reconstruction of 220 kV Huiwang line is provided.