Desenvolvimento de modelo virtual para testes de detecção de faltas de alta impedância em tempo real

Abstract

This final paper presents the development of a virtual real-time high impedance fault model for the Typhoon HILs real-time simulators toolchain. High impedance faults are very common events in overhead distribution systems and occurs when there is contact between an energized conductor and a surface with high electric resistance. However, this events are difficult to detect by common protection functions, requiring specially designed algorithms for its detection. Since HIFs have characteristics that distinguish them of the other faults, it is also necessary to model these events in order to develop the correct design of protective functions. In view of the advantages of real-time simulation tools combined with the almost abscence of HIF models in simulations library, this work proposes the development of a virtual model for the HIL Control Center, the Typhoon HILs real-time simulators toolchain. For this, a HIF model proposed by Gautam and Brahma (2013) is implemented chosen for its wide dissemination in the academic environment combined with an easy execution by simulators. With the model implemented, it is validated through comparative analysis with the same model and test system implemented in the ATP Draw simulator. Finally, the HIF hardware-in-theloop (HIL) detection tests are performed using the SEL-751 relay, a feeder protection relay from Schweitzer Engineering Laboratories.