A program of computer-aided coordination analysis for anundergraduate course in protective relaying

The authors introduce a program used as a tool for protective relaying courses at the undergraduate level. This program allows students to practice protective devices coordination in power systems on a personal computer by representing the time-current curve with dynamic computer graphics. The program is provided with a debugging system that is designed to inform the user of any problem found in a protection scheme. To make students fully understand the dynamic performance of protective devices coordination, the program allows students to assign the location of a fault, and will display the operating time of the protective devices according to the tripping sequence. The program also has the function of automatic coordination analysis, the results of which can be compared with the user's scheme and can also help the user to have a better understanding of what is actually used in industry today