NSF CAREER award to study accelerated aging of insulation used in power systems

By Barbara Micale

Mona Ghassemi

Mona Ghassemi. Photo Peter Means for Virginia Tech.

It is expected that by 2030, 80 percent of all electric power will flow through power electronics systems.

With an increasing need for more energy to power homes, schools, and businesses, stress on the United States’ deteriorated and aged electric power network is reaching a critical point. Yet emerging wide bandgap-based technologies, leading to higher power density and efficiency, can accelerate the aging and degradation of insulation systems and lead to unexpected failures.

“Because electrical insulation determines the life of an electrical system, whether we are talking about the country’s electric power grid, a computer, or an electric vehicle, it is important for us to find solutions to aging insulation systems,” said Mona Ghassemi, assistant professor in the Bradley Department of Electrical and Computer Engineering.

Ghassemi was recently awarded a five-year $500,000 National Science Foundation Faculty Early Career Development (CAREER) award to conduct research that addresses this issue. The CAREER award is NSF’s most prestigious award in support of early-career faculty.

Replacement of a faulted power system component can take up to a few days, and during that time, the power grid is more prone to blackouts. Blackouts can negatively impact communities and the economy in a significant way. The Northeast blackout that occurred in August 2003, for instance, affected approximately 50 million people in eight U.S. states as well as the Ontario province in Canada, resulting in $6 billion in economic losses in goods and services, said Ghassemi.

Ghassemi will study accelerated aging of insulation systems used in all components of power systems, such as rotating machines, transformers, cables, and cable terminations under fast, repetitive voltage pulses originated by next-generation wide-bandgap-based conversion systems. The project will also develop high-frequency thermal-electromagnetic transient models for the components to determine overvoltages, electrical stress, and thermal stress under wide bandgap-based voltages pulses.

“Electrical insulators are materials with a high resistivity that allows them to prevent electric current from flowing where it is not wanted,” Ghassemi said. “An electrical system without insulation is as useful as an automobile without tires. It has all the potential to perform a useful service; however, it is missing a critical component. Therefore, any electrical system must have adequate electrical insulation to perform under normal operating conditions and also provide insulation at the extremes when the system is overstressed.”

Ghassemi will conduct her research in close collaboration with the world’s largest manufacturing companies of power system apparatuses and one of the largest utilities in the United States.

Her NSF CAREER project also integrates an educational component to help train the next generation of high electric field and electrical insulation engineers and researchers, who are needed to maintain the competitive vitality of the U.S. power system and electronics workforce.

The education plan also aims to open the pipeline at the high-school level. Ghassemi will collaborate with the Center for the Enhancement of Engineering Diversity at Virginia Tech on K-12 outreach activities designed to attract women and ethnic minorities to the field of electrical engineering.

A Virginia Tech faculty member since 2017, Ghassemi has also won another award for young faculty this year, the 2020 Air Force Office of Scientific Research Young Investigator (YIP) Program Award. She is only the second faculty member in the Department of Electrical Engineering to receive both the NSF CAREER and DOD YIP award in the same year.

Ghassemi earned her Master of Science and Ph.D. degrees in electrical engineering from the University of Tehran, Iran, in 2007 and 2012, respectively.

Her professional involvement includes at-large member of the Administrative Committee of the Institute of Electrical and Electronics Engineers Dielectrics and Electrical Insulation Society for 2020–2023; corresponding member of the IEEE Conference Publication Committee of the IEEE Power & Energy Society; and active member of several CIGRE working groups and the IEEE Task Forces.

Ghassemi is also a senior member of the Institute of Electrical and Electronics Engineers; a registered Professional Engineer in the Province of Ontario, Canada; and an associate editor of IEEE Transactions on Industry Applications, IET High Voltage, and the International Journal of Electrical Engineering Education.


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