Development of Stable High-Temperature Insulation Gas Generation Method for Insulation Gas Properties under High Temperatures

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03997
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 21010:Power engineering-related
• Research Institution: Kanazawa University
• Principal Investigator: Nakano Yusuke 金沢大学, 電子情報通信学系, 助教 (60840668)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: ガス遮断器 / 高温絶縁ガス / 電気絶縁 / 誘導熱プラズマ

Outline of Final Research Achievements

In a gas circuit breaker, the arc plasma that remains between the electrodes immediately after current interruption has high conductivity at a high temperature of over 3000 K. In this research project, the purpose was to develop a method to stably heat the insulation gas to a high temperature of several thousand K using an inductively coupled thermal plasma (ICTP) system and to evaluate the electrical insulation properties with high reproducibility.
The constructed system was able to achieve an insulating gas temperature of approximately 4000 - 6500 K. The temperature of the heated insulating gas can be controlled by parameters such as the lower coil power and the flow rate of the insulating gas introduced.

Free Research Field

電気工学

Academic Significance and Societal Importance of the Research Achievements

本研究手法は，ガス遮断器内の高温環境における絶縁破壊現象を再現するものである．電力系統における事故波及を防ぐために，ガス遮断器は事故による大電流を遮断する責務を担っている．電流遮断直後の遮断器の接点間に残留する高温ガスは，続けて印加される過渡回復電圧に耐えなければならない．このような高温環境を誘導熱プラズマ装置の適用によって，温度を適切に制御し，かつあらゆるガス種に対して再現できる装置を構築した．構築した装置・手法は，従来手法で課題となっていた温度限界，時間制御性を改善し，高温ガスの電気絶縁特性を実験的かつ再現性よく取得できるようになった．