1994 Volume 114 Issue 7-8 Pages 686-692
We developed PCM carrier pilot protective equipment for resistance ground neutral system. This protective equipment uses 1.544 Mbps loop transmission lines.
It fealures are loop-back control on transmission trouble, preference tripping and differential relay with voltage restraint for branch terminals.
The transactions of the Institute of Electrical Engineers of Japan.B
The Journal of the Institute of Electrical Engineers of Japan