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Traction power supply system relay protection must be reasonable, standardized, accurate, quick break to satisfy the protection, reliability, selectivity, sensitivity requirements. The traction substation protection devices running mostly independent component protection, in some cases, is not conducive to the rapid identification and removal of the fault, there may even deteriorate System Status. Integrated protection can access many of the substation information that can be integrated traditional protection principle, can produce new protection features, thereby enhancing the overall performance of the protection. This article summarizes the features and advantages of the integrated power system protection, combined with the the traction substation actual analysis, the main work is as follows: (1) the design of traction substation integrated protection. This paper analyzes traction substation protection configuration, combined with the principle of substation hierarchical distributed traction substation by function, several intervals, drawing on the idea of ??the integrated power system protection, the preliminary design of traction substation integrated protection scheme . On this basis, an integrated concept low-voltage side busbar protection criterion can quickly identify the bus fault, and the algorithm is simple, convenient, high reliability, has practical application value. Of integrated protection in the traction network-phase short-circuit fault, the fault component correlation analysis method can be combined to complete the feeder-phase short-circuit fault protection. (2) from the protection function design the traction substation integrated backup protection unit. The unit in the failure of a certain interval protection through the use of the installation to complete back-up protection function in the other intervals protection information, at the same time reduce the time within which a back-up protection action to avoid the blackout extended, compared to the more obvious advantages of independent protection, through simulation software PSCAD / EMTDC verify the correctness of the theory. (3) used in traction substation integrated protection reliability preliminary analysis. To ensure that the principle is correct, the integrated protection program line reliability analysis, refers to a reliability index based on the protection of the economy, the instance is proved by integrated protection have a higher reliability than independent protection. Then explain the integrated protection, although there are some flaws, but after the improvement of the study can still be expected to play an important role in the protection of traction power supply system.
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