Protection system for power line

The utility model discloses a protection system for a power line, and relates to the field of power equipment and communication, which is used for solving the problem of the prior art that a uniform interface standard does not exist between relay protection apparatus and communication SDH equipment. The system comprises two sits, wherein each site comprises the relay protection apparatus and the communication SDH equipment mutually connected through an optical fiber cable; and the two sits are communicated through the communication SDH equipment. The utility model unifies the interface between the relay protection apparatus and the communication SDH equipment and removes a conversion equipment between both, thereby solving the problem associated with the prior art.