| At present, high frequency channel and optical fiber channel are widely used as the signal transmission path of the pilot protection of HV and EHV transmission lines. While the application of fiber protection can avid many problems from high frequency carrier wave channel, and fiber protection is more and more widely used in high-voltage power systems.The development process of the optical fiber protection is described in this paper. The actual operation status of the protection of 220 kV lines in Sihui substation and the main problems in recent years during operation of the high-frequency protection is analysed. According to the shortcomings in the high-frequency protection, fiber channel can used to improve reliability of operation.Then in this article, superiority of fiber-optical protection is analyzed, the characteristic of pilot protection and the connect ways of optic-fiber channel with relay protection devices is introduced. 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.Finally, 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.The plan for reconstruction of 220 kV Huiwang Line is provided. |
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