This project is the continuation of the doctoral research of the candidate, grant FAPESP 2014/18551, which a methodology was developed to obtain transmission tower models directly in time domain, taking into account the tower-footing grounding system, homogeneous soils and the trusses of the structure of the tower. Such parameters are generally omitted from traditional transmission towers models. In addition, giant towers were studied during his doctorate where no model was proposed in the scientific literature. It has been found that the models for traditional transmission towers are not suitable for the representation of giant towers. Based on these models, it will be obtained, using the Method of Moments (MoM), the admittances of several conventional and giant transmission towers, where tower-footing grounding system is connected. Diverse aspects such as: frequency dependence in soil parameters, stratified soils and new ground topologies and transmission towers will be considered in this project, complementing the results of the doctoral research. This admittance is approximated by a rational function in which a discrete electric circuit is obtained and can be inserted into any software for electromagnetic transient simulations. In this way, the development of the model will allow to estimate with more precision the level of the surges resulting from the lightning that may strike on the towers of the transmission lines. Once validated, the complete model is proposed for analysis of the overvoltages that may cause the backflashovers and lead to outages in electric power systems.
News published in Agência FAPESP Newsletter about the scholarship: