High voltage electrical insulation, discharge control, and protection technology for electrical equipment.
Monozukuri (Saitama University Research Seed Collection 2025-27 p.47)
Keywords: High voltage insulation, high current interruption, discharge suppression, electrical insulation in general, high voltage technology in a vacuum, fuse technology.
High voltage (generally electrical equipment over 600V) is used in various places, starting from power transmission and distribution. This is because it allows for efficient use (transport) of electricity and makes it easier to generate high electric fields. When attempting to use electricity at high voltage, unexpected breakdowns in electrical insulation (preventing electricity from flowing) can occur, leading to discharges (similar to small lightning) that can cause power outages or damage to equipment. It is important to prevent such occurrences, and to ensure that electricity can be used safely and securely, proper electrical insulation must be maintained. If electrical insulation is completely compromised and a large current flows, it can lead to catastrophic accidents such as fires or explosions, as well as equipment failures. Even if such incidents occur, it is also crucial to have protective devices that can immediately cut off the large current (referred to as disconnection in electrical terms) to minimize accidents. In our laboratory, we conduct research on electrical insulation using "vacuum," which has excellent insulating properties. We are also researching fuses to protect equipment when a large current flows due to electrical accidents.
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Yasushi Yamano, Professor Graduate School of Science and Engineering, Department of Mathematical and Electronic Information, Field of Electrical and Electronic Physics 【Recent Research Themes】 ● High voltage resistance and discharge suppression in vacuum insulation ● Research on improving the performance of electrodes and insulators for high voltage applications ● Research on enhancing the interrupting performance of fuses ● Research on direct current high current interruption
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【Appeal Points to the Industry】 ● We offer consultations for those troubled by discharge, particularly regarding insulation methods and discharge suppression techniques in a vacuum. ● We also accept inquiries about various high voltage tests, insulation performance tests, and large current interruption tests for fuses, etc. ● Our university is equipped with testing facilities for high voltage and large current, along with dedicated testing rooms. ● An AC/DC/impulse high voltage testing system (see Figure 2, with maximum output voltages of AC: 100kVrms, DC: 200kV, and lightning impulse voltage: 1000kV) is installed, allowing for various high voltage tests. ● Interruption tests can be conducted using an LC resonant type large current generation device (up to 100kArms at low voltage 600V and up to 40kArms at high voltage 7200V). 【Examples of Practical Applications, Case Studies, and Utilization】 ● Suppression of discharge and improvement of dielectric strength in charged particle accelerators, X-ray sources, and electron beam devices. ● High dielectric strength in power switching devices. ● General suppression of discharge in various equipment. ● Various tests on different types of fuses (interruption tests, melting tests, temperature rise tests, etc.).
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Figure 2 AC, DC, and Impulse High Voltage Test Equipment
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The Saitama University Open Innovation Center is a center that functions as a liaison office for industry-academia-government collaboration. It consists of three departments: the Industry-Academia-Government Collaboration Department, the Intellectual Property Department, and the Startup Support Department, each staffed with coordinators well-versed in various fields. The center's activities include solving technical challenges in companies, supporting the implementation of joint research, and conducting technology transfer aimed at introducing and utilizing Saitama University's intellectual property.