Computational method for automatic overcurrent coordination of protection devices in industrial electrical systems / Metodologia computacional para coordenação automática de dispositivos de proteção contra sobrecorrente em sistemas elétricos industriais

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

This work presents a computational methodology for automatic overcurrent coordination of protection devices in radial industrial electrical systems, which main advantages are the accuracy in the devicessettings calculation and the automatic proposition of solutions to coordination problems, whenever it is possible. The methodology is used both for equipment individual overcurrent protection and for protection devices coordination. A detailed study of the overcurrent protection requirements of the equipments used in industrial electrical systems, such as motor, cable and transformer is carried out, as well as of the most used protection devices, fuses and low voltage circuit breaker, with emphasis on the protection by means of overcurrent digital relays. The method is used to develop a computational tool. There is an explanation of the search and settings calculation algorithms applied to the devices of each equipment. Finally, two examples of industrial electrical systems are used to assess the performance of the proposed methodology. It is shown that it presents good performance on the accuracy in the calculation of the devices settings and on amount of time spent on protection coordination and selectivity studies.

ASSUNTO(S)

seletividade relés digitais overcurrent protection coordination power systems protection sistemas elétricos industriais curto-circuito proteção de sistemas elétricos selectivity digital relays short circuit industrial electrical systems coordenação da proteção de sobrecorrente

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