Abstract
Our system involves two sample power plants which feeds power into three-phase transmission line. A total of 10 generator/motor units, 10 power transformers, 7 transmission line sections, and 1 equivalent utility load are associated to the sample power system. The goal is to determine the proper relay settings for distance and ground overcurrent relaying on the present system configuration after in-depth fault analysis. We will provide step distance protection and use an overcurrent relay as backup protection for the sampled power plant. The expected results will give us line protection for 230 kV transmission lines.