A model of traveling wave relay

This paper presents the modeling and implementation of a traveling wave relay for transmission line protection at Extra High Voltage. The protection scheme is compounded of two algorithms; the first of them is a type D which is synchronization via GPS satellite and is used as the primary relay. The second algorithm uses a single end measurement and serves as a backup in case the primary relay fails. This second algorithm is based on a composite function which uses the ratio of the standard correlation function and a pattern recognition technique, either the Euclidean or Manhattan distance.