Patent ID: 9054778
Filing Date: 2015-06-09
Classification: H02H,H04B

Abstract:
1. A transmission line protective relay device wherein evaluation of whether or not a fault has occurred on a protected transmission line that has terminals with transformers installed on multiple transmission lines with three terminals or more is performed by mutual exchange of terminal information based on currents input from said transformers of each terminal through respective communication channels, and current difference computation is performed using terminal information of a terminal in question and incoming terminal information received from remote terminals respectively, said transmission line protective relay device comprising: an input processing means that is arranged to connect a transmission line protective relay device arranged at each terminal with each communication channel, and to output an incoming current at a terminal in question as terminal information by input processing, at each transmission line protective relay device of each terminal; a plurality of reception processing means that respectively receives terminal information delivered from a remote terminal connected with said terminal in question by a communication channel; a computational processing means that performs current difference computation by inputting terminal information that was output from said input means and terminal information of said remote terminal that was output from said plurality of reception means; and a transmission processing means that transmits main terminal information constituting said terminal information of said terminal in question and backup terminal information constituting terminal information of a remote terminal that is different from a remote terminal in question, to a remote terminal connected by a communication channel with said terminal in question, wherein said computational processing means, if said main terminal information and said backup terminal information cannot be received in a predetermined time from an arbitrary communication channel of communication channels, performs current difference computation using terminal information of all of said terminals, using said backup terminal information delivered through another communication channel, instead of said main terminal information that could not be received from said communication channel in question.