Kawashima, Tomohiro
Affiliation | Department of Electrical and Electronic Information Engineering |
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Title | Associate Professor |
Fields of Research | Measurement, High Voltage, Electrical insulation, |
Degree | Doctor of Engineering (Toyohashi University of Technology) |
Academic Societies | Department of Electrical and Electronic Information Engineering |
kawashima@ee Please append ".tut.ac.jp" to the end of the address above. |
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Laboratory website URL | http://dei.ee.tut.ac.jp/ |
Researcher information URL(researchmap) | Researcher information |
Research
Current electric power systems are diversifying from power generation to usage, for instance, the promotion of renewable energy and the spread of electric vehicles. On the other hand, the aging of power equipment that was introduced in large quantities during high economic growth is also a severe issue. It is crucial to quantitatively clarify the lifetime of the equipment and ensure a stable supply of electricity through appropriate updates, as well as to develop technology to realize next-generation power systems. We develop nondestructive high-voltage measurement technology that contributes to the condition diagnosis of power systems. We also aim to apply the developed technology to research fields such as steel, automobiles, and food.
Theme1:Deterioration Diagnosis of high voltage insulation systems by measuring partial discharges
Overview
One cause of the deterioration of high-voltage insulation systems in power equipment is minute discharges, namely partial discharges. Measuring partial discharges with the broadest possible band and time series and then quantitatively evaluating the deterioration area and circumstances using the information of the waveform should help prevent severe accidents. In this research, we develop a deterioration diagnosis technology using a time-series analysis of partial discharge waveform characteristics. We also aim to assess the condition of the deterioration and make predictions using machine learning.
Keywords
Theme2:High voltage dielectric spectrum measurement and its applications
Overview
Dielectric properties at high voltages are mainly evaluated using bridge circuits. Since transformers can apply as voltage sources, obtaining high voltages is easy; however, it is often difficult to sweep the frequency. The frequency spectrum at high voltages allows us to evaluate, for example, nonlinear charge behavior related to degradation. We develop a deterioration diagnosis technology for power equipment using high voltage dielectric spectrum analysis. In addition, we aim to apply this technology to the operation assessment of high-voltage actuators and real-time non-destructive diagnosis of food products.