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Energy Control Engineering Lab
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This lab clarifies and controls the arc discharge that occurs when large currents are interrupted.
AboutAbout the lab
Clarifying and controlling phenomena of high power and high current
The Yokomizu Lab studies the physical and chemical phenomena that occur inside electrical equipment using high power and large currents, as well as how to control them.
Its main subject is arc discharge, a high-temperature gas that forms when circuit breakers and fuses interrupt current.
Beyond clarifying the phenomena, the lab also works on devising solutions that use new measurement methods and techniques.
The lab also studies the operation and control of distribution systems connected to distributed power sources such as solar power generation.
Key terms
- Arc discharge
- A discharge in which current continues to flow between electrodes, emitting intense light and high heat. It tends to occur when current is interrupted.
- Circuit breaker
- A device that disconnects a circuit and stops the current when a large current flows due to a fault or similar event.
- Distributed power source
- Power generation equipment that is spread across many locations, such as solar power generation.
NewsLab news
A master's student received the Excellent Paper Presentation Award at the Tokai-Section Joint Conference of the Institutes of Electrical and Information Engineers
A doctoral student received the Best Student Award at the International Symposium on High Voltage Engineering
A master's student received the Excellent Paper Presentation Award from the Institute of Electrical Engineers of Japan
Assistant Professor Kodama received the Excellent Encouragement Award from the Technical Committee on Static Apparatus of the Institute of Electrical Engineers of Japan
ResearchResearch themes
The lab studies the physical and chemical phenomena that occur in electrical equipment using high power and large currents, along with the technologies to control them. It works on clarifying the properties of arc discharge, developing new measurement and interruption methods, and controlling distribution systems connected to distributed power sources.
*Illustrative imageExtinguishing arc discharge quickly
Arc discharge that occurs inside circuit breakers, fuses, and car motors shortens equipment life and causes malfunctions. The lab clarifies the fundamental properties of arcs and studies ways to extinguish them quickly.
*Illustrative imageMeasuring arcs and interrupting current without arcs
The lab is developing methods to measure the voltage and shape of arcs inside circuit breakers with high accuracy without touching them. It is also working on a new circuit breaker that uses SiC-based power semiconductors to interrupt DC current without producing an arc.
*Illustrative imageDistribution systems connected to solar power generation
When distributed power sources such as solar power generation are connected to a distribution system, reverse power flow becomes more likely, which affects power quality and stable supply. The lab studies control methods for delivering power stably.
MembersFaculty
The Yokomizu Lab consists of faculty and doctoral, master's, and undergraduate students.As of 2026
- ProfessorYasunobu Yokomizu
- LecturerNaoto Kodama
VoicesStudent voices
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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: “National Bureau of Standards high voltage laboratory” 作者不詳 / Public domain (cropped)
- Extinguishing arc discharge quickly: “High-voltage circuit-breaker, white insulators” Angie from Sawara, Chiba-ken, Japan / CC BY 2.0 (cropped)
- Measuring arcs and interrupting current without arcs: “Substation Circuit Breaker 1” Yoshieslunchbox / CC BY-SA 4.0 (cropped)
- Distribution systems connected to solar power generation: “Solar Power Plant and High Voltage Plant in Keetmanshoop” Hp.Baumeler / CC BY-SA 4.0 (cropped)
- Related lab (Power Apparatus and Energy Transmission Engineering Lab): “Jabalpur Engineering College (JEC)'s High Voltage Lab” User:R K Alaria / CC BY-SA 3.0 (cropped)
- Related lab (Power Electronics Lab): “Circuit Board 2015” Jguarin / CC BY-SA 4.0 (cropped)
- Related lab (Plasma Electronics Lab): “Bell Jar 35 with Argon Plasma” Diener electronic GmbH + Co KG / CC BY-SA 4.0 (cropped)
- Related lab (Power Electronics (S) Lab): “Electric insulators on top of a transformer (2)” High Contrast / CC BY 3.0 de (cropped)
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