Abstract
This paper presents an integrated boundary protection scheme for power transmission line systems. The scheme combines the latest developments in two areas of power system protection, the transient based protection and the integrated protection. In the proposed scheme, an integrated relay based on the boundary protection principle installed at a substation is responsible for the protection of all transmission lines associated with the substation. The relay is able to offer a fast trip for any fault on its protected line sections without the need for a communication link. The paper outlines the integrated protection system based on the substation communication network, and gives a description of the basic principle and algorithm of the boundary protection technique. Some typical simulation results are then used to demonstrate the performance of the scheme.
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