Uma metodologia para análise de falhas em sistemas elétricos multifásicos

Abstract

In this work a tool for fault analysis was developed, and models of many electrical systems equipment were considered in detail, allowing the analysis of multiphase systems by representing it in a more general and realistic way possible. The methodology developed for fault analysis is based on the current injection method in rectangular coordinates, where the Newton-Raphson method is used in the solution process and all quantities are defined directly in phase coordinates. The modeling of the entire electrical system is made based on elements which assemble the structures of equipment in their models, and these elements can be connected in various ways. Even the short circuit conditions are modeled by elements connected in different configurations. Also the inclusion of controls is done optimally. With the considered modeling the system to be solved is the strictly necessary, and therefore, the method shows to be efficient. The methodology is also very flexible because it is able to represent equipments with any number of conductors in many different configurations, allowing the representation of imbalances, mutual couplings, groundings and neutral cables explicitly, and allowing to model various types of faults, among other features. Therefore, the methodology allows fairly complete analysis, and the representation of the system can be made with the level of detail that is possible and desirable in every situation. The tool developed is quite ample being able to simulate balanced or unbalanced, radial or meshed systems, various types of failures (such as shunt short circuits, internal faults, simultaneous fault, and series opening), it can be applied to the transmission, subtransmission, distribution and industrial systems, including large scale systems.