For Jozef Levi, electricity was always like undiscovered places in far corners of the world. "The only way to get there was to discover the secrets of laws of physics. I have spent all my life getting to those places."
Levi is an application engineer for circuit breaker testing and TDR test instruments at Doble Engineering Co. in Watertown, Massachusetts. He regularly meets new people, sees new places, and interacts with different cultures through his position at Doble Engineering.
He earned a diploma in electrical engineering from the Electro-technical Faculty of the University of Sarajevo in 1973. Before joining Doble in 1999, he had worked with the Energoinvest Electrical Institute in Sarajevo; Energomex in Mexico City; and E Manufacturing, in Mentor, Ohio. Now, besides working as application engineer, he teaches courses in mechanical testing of circuit breakers. He is now preparing a new presentation for detecting contact wear of generator circuit breakers using Rogowski coil.
Levi will present Timing and Motion Testing of High-Voltage Circuit Breakers at the Finepoint Test and Maintenance Training Conference on Oct. 7-11, in Atlanta, Georgia. According to standards, the high-voltage circuit breaker is a mechanical device capable of making, carrying and breaking current under normal circuit conditions. They also make, carry for a specific time and break currents under specified abnormal circuit conditions such as those of short circuit. At the same time, it must be a perfect conductor in the closed position and a perfect insulator in open position. It must also be fast when closing and it must be fast when opening, but it must not produce overvoltages. In the end, the high-voltage circuit breaker design is a compromise of all-of-the-above.
"The first role of an HV circuit breaker is protection. As a mechanical device, the HV circuit breaker has to be ready at all times to operate under normal and abnormal conditions," Levi said. "Testing HV circuit breakers can give us an indication of what condition the circuit breaker is in and if it can operate properly."
Levi has spent more than 30 years designing high-voltage circuit breakers and disconnect switches. As an application engineer at Doble, he can share his knowledge with clients to help them in understanding how circuit breakers work and why we have to test them.
Levi credits Alexander Graham Bell with the motto: "Before anything else, preparation is the key to success.” His goal is that students understand that preparation is an important part of testing, and understanding physical processes in circuit breakers will help them to better analyze test results and make good decisions based on test results.
He spends most of his working time as a designer of circuit breakers and disconnect switches."When I have time I like to design chairs and tables. I find it satisfying to come up with an idea and watch it develop and come to fruition," Levi said. "My hobbies are certainly an extension of my career, or you can say that my career is an extension of my hobbies."