Graphical coordination of overcurrent protection devices using a desktop computer

An interactive computer program has been developed that assists with the coordination of overcurrent protection devices. An engineer can enter relay or fuse settings, view the resulting characteristic curves on the computer's graphical display, evaluate the coordination of the overcurrent protection devices, and save the data used for both the protection devices and the substation. The program runs on an IBM PC/AT or compatible computer with a VGA interface, but was written in the C programming language so that it could easily be recompiled for another machine.