Evaluation of induced stray voltages from transmission lines using EMTP

The purpose of this paper is to study the effect of transmission system parameters and operating conditions on generated stray voltage levels. This includes the transmission line conductor configurations, line loading levels, grounding system parameters, the feeder configuration (radial or ring configuration) and unbalance loading. This enables a better way to understand how different electrical parameters impact the level of NEV and currents at points of interest during different utility operating conditions. Excessive stray voltages levels may have a negative effect on dairy farm cows and endanger personnel safety. EMTP was used to simulate the coupled electromagnetic-power circuit system. EMTP models of the poles and the line phase, neutral, and ground wire were built to represent the transmission line electromagnetic behavior and the stray voltage generation mechanism. The parameters of the proposed models were obtained from the technical literature. Different simulations were conducted by varying the system parameters and operating conditions. A discussion of these results is presented.