Development of a Motor Monitoring and Protection Bench Using Digital Relays

Luiz Otávio Mattos dos Reis, Leonardo Mesquita, Pedro E. Lopes Nunes, and João R. de Moraes

Sao Paulo State University, Brazil

Abstract: This paper presents the development of an educational bench for being used in the teaching of electrical power systems involving: protection, supervision of electrical systems, measurement and acquisition of data. The bench as central elements on SEL digital relays. This article focused on the SEL-849 relay dedicated to the protection and monitoring of electric motors. The protection, monitoring, and measurement functions were used and tested for monitoring and measuring tests of a 0.75Hp induction motor. The tests have how objective to analyze the effects during load operation for two operating conditions, which together with the tests in empty and with the locked rotor, established ambiguous aspects to determine the best operating point. Engine temperature monitoring will also be carried out during tests to survey its thermal curve.

Key words: smart relay, engineering education, education bench for motors tests