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Power Apparatus and Energy Transmission Engineering Lab
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A power engineering lab studying electrical insulation in gases, vacuum, liquids, and solids, as well as superconductivity.
AboutAbout the lab
Toward building next-generation energy systems
The Hayakawa Lab studies a wide range of topics in power engineering, including high-electric-field phenomena, electrical insulation, and superconducting technology.
Its main subjects are discharge and insulation in solids, liquids, gases, and vacuum, and the application of superconductivity to electric power.
Experiments are carried out in a high-voltage laboratory equipped with an 800 kV impulse voltage source and a 250 kV AC voltage source.
The lab also collaborates with industry, including participation in research and development projects and joint research.
Key terms
- Electrical insulation
- Separating conductors from one another so that electricity does not flow where it should not
- SF6
- Sulfur hexafluoride. A gas that does not conduct electricity easily and has long been used in power equipment, but has a large impact on global warming
- Superconductivity
- A phenomenon in which electrical resistance becomes zero when a material is cooled to a very low temperature
NewsLab news
A student received the Young Researcher Encouragement Award from the High Voltage Technical Committee of the Institute of Electrical Engineers of Japan (IEEJ)
A student received the Excellent Paper Presentation Award at the IEEJ National Convention
A doctoral student received the IEEJ Excellent Paper Presentation Award
A master's student received the Japan-Korea Young Researcher Exchange Program Award
Prof. Hayakawa received the Ieda Award (Academic Contribution Award) from the Technical Committee on Dielectrics and Electrical Insulation of the IEEJ
ResearchResearch themes
As a power engineering lab, it conducts research centered on high-electric-field phenomena, electrical insulation, and superconducting technology. It works on electrical insulation in solids, liquids, gases, and vacuum, and on applying superconductivity to electric power.
*Illustrative imageGas insulation as an alternative to SF6
SF6, long used in power equipment, has a large impact on global warming, and its emissions are restricted. The lab captures the waveforms of discharge current and the light emission when voltages simulating lightning surges and similar events are applied, and investigates the mechanisms of dielectric breakdown in alternative gases.
*Illustrative imageVacuum insulation technology
Vacuum insulation does not use greenhouse gases, so it is highly compatible with the environment. The lab conducts experiments and analysis on conditioning, in which discharges between electrodes are used to improve insulation performance, and on surface discharge along electrodes and wall surfaces.
*Illustrative imageDischarge in oil
Oil insulation has long been used in transformers at substations and in power transmission lines. The lab aims to clarify discharge phenomena in oil and apply the findings to the maintenance and diagnosis of substation equipment. Oil insulation is also expected to help achieve higher power density in electric-propulsion aircraft.
*Illustrative imageInsulating materials with changing internal properties
To suppress the build-up of high electric fields inside power equipment, the lab develops functionally graded materials (FGM), whose internal properties change continuously. They are evaluated through sample fabrication, electrical simulations, and voltage application tests.
MembersFaculty
The Hayakawa Lab consists of faculty members, secretaries, doctoral, master's, and undergraduate students, and exchange students.As of 2026
- ProfessorNaoki Hayakawa
- Associate ProfessorHiroki Kojima
- Project ProfessorMikimasa Iwata
- Project Assistant ProfessorAyaka Nakamura
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Jabalpur Engineering College (JEC)'s High Voltage Lab” User:R K Alaria / CC BY-SA 3.0 (cropped)
- Gas insulation as an alternative to SF6: “110kV-SF6-Schaltanlage Umspannwerk Simmering” Wdwd / CC BY-SA 3.0 (cropped)
- Vacuum insulation technology: “Vacuum interrupter” Dingy / CC BY-SA 3.0 (cropped)
- Discharge in oil: “BA75-b2hv-Breakdown-during-transformer-oil-testing” HVWeb / Public domain (cropped)
- Insulating materials with changing internal properties: “Johnny ball strain insulator” Chetvorno / CC0 (cropped)
- Related lab (Energy Control Engineering Lab): “National Bureau of Standards high voltage laboratory” 作者不詳 / Public domain (cropped)
- Related lab (Power Electronics Lab): “Circuit Board 2015” Jguarin / CC BY-SA 4.0 (cropped)
- Related lab (Advanced Device Lab): “Wafer” Santi / CC BY-SA 2.0 (cropped)
- Related lab (Nano Electronic Devices Lab): “Hukseflux flexible heat flux sensor FHF04 with incorporated temperature sensor” Hukseflux TS / CC BY-SA 4.0 (cropped)
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