School of Electrical, Computer and Energy Engineering M.S. Final Oral Defense Substation Grounding Systems Analysis and Optimization by Xuan Wu 11/20/2013 12:00 pm ERC 533 Committee: Dr. Dan. Tylavsky (chair) Dr. John Undrill Dr. Raja Ayyanar Abstract According to the IEEE Guide for Safety in AC Substation Grounding, the two main design goals to be achieved by any substation ground system under both normal and fault conditions are: 1. To provide means to dissipate electric currents into the earth without exceeding any operating and equipment limits 2. To assure that a person in the vicinity of grounded facilities is not exposed to the danger of critical electric shock . In order to ensure the safety and well-being of personnel who may come close to conductive media, it is significant to do proper and practical analysis and calculations of substation grounding systems safety metrics. In other words, the primary purpose of creating ground systems is to avoid the injury of human beings during unbalanced fault conditions. For this purpose, the author created a computer program called “OptimGrid” using MATLAB to model two-layer soil, analyze and optimize grounding systems based on Salt River Project design rules.