This paper present the study of a new principle in directional relaying based on a new current mode derived by a new modal transformation technique, the α mode. The detection unit is installed at a substation and interfaced to every emanating line through the CTs. In the proposed technique, the fault generated transient signals are captured by the relay using a new transient detection technique. The technique uses the symmetrical component to replace Clark transformation to decouple the three phase transient current signals. Theoretical analysis and extensive simulation studies show that the technique is able to give correct responses for all fault types. For the all emanating line of the a certain busbar, the polarity of the transient current traveling wave come from the fault direction is different from the ones of other emanating lines. That is the basic principle of this integrated protection. This paper applies the symmetrical component transformation technique for polarity detection and signal processing. The paper also includes extensive simulation studies of a typical transmission line and the faulted responses with respect to different fault conditions. (5 pages)