Descrição do sistema de tração elétrica aplicado ao metrô de Fortaleza (METROFOR)

Abstract

The present work gives a detailed description about the electric traction system applied on the Fortaleza subway. The southern line is the only line electrified. All research was done to explain the nuances of the train's motion dynamics and how the system behaves at every variation of the engine effort. The rectification zone of the traction substation was minuted, explaining its physical composition, the reason for the use of power semiconductors (diodes), the snubbers circuits and the protection cubicles, besides the attached plant in CAD of the electric traction system. The electric traction network was scanned, showing all the components of its support, it was also spoken about the current sensor (pantograph) that feeds the drive circuits, how the contact wires were arranged and their cross-sectional shape, besides showing the problems associated with leakage currents on the metal pipes and how this problem was solved. Finally, it is spoken of the motor drive circuit, such as theoretical introduction to the three-phase induction motor, the form of control associated with frequency inverters, dynamic and regenerative braking and regenerative braking control through the brake choppers, being concluded with a schematic of activation of the train made by the author.