1994 Volume 114 Issue 7-8 Pages 792-799
This paper introduces a protective relay setting system capable of handling a large network upto 10000 buses. The remarkable features are the useful functions such as network analysis (fault analysis, load flow calculation, zero-sequence current calculation, etc.), relay operation simulation, and automated setting coordination tasks. Fault currents in the maximum and the minimum operation networks are calculated to examine the setting values. The protection zones are automatically searched along the network connection. Protection coordination tasks among the primary and the backup relays composed of different types of relays can be performed by the relay operation simulation.
The system is built on an engineering work station, which works in cooperation with other network operation support systems. Its graphical user interface helps every engineer to examine the relay setting using a variety of databases.