Metodologia de ensaio “ponta a ponta” na proteção de linhas de transmissão da rede básica do sistema elétrico de potência

Abstract

This study comprises the development of a standard method for performing the test called "end to end" for protection of Transmission Lines of interconnected power systems. In most electric utilities, preventive maintenance of the protection system of basic network is performed usually at every four years. Considering this long time lapse between maintenance, it is evident that commissioning should be performed in extensive and complex way in order to cover the majority of situations that a power system may be subjected. This results in an increase of protection system reliability. The use of a standardized methodology for end-to-end testing accomplishes this need. This test methodology consists in the simultaneous application of simulated fault voltages and currents in the protective relays of both sides of the line. This way, not only the protective relays are tested but also the pilot protection systems. The objective of this work is to developed this test methodolo gy and describe a standard procedure that can be used by all maintenance teams of a power utility. With this procedure, the system is also subjected with situations closer to the reality, thus resulting in an increase of reliabitliy.