Research and development of new main circuit breaker with liquid aec for multi terminal high voltage direct current transmission

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K06243
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Power engineering/Power conversion/Electric machinery
• Research Institution: Tokyo University of Technology
• Principal Investigator: SHINKAI Takeshi 東京工科大学, 工学部, 教授 (00758295)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: 限流器 / 遮断器 / 直流送電 / アーク / 液中プラズマ

Outline of Final Research Achievements

We have researched new concept for HVDC-CB with the hybrid structure of the current limiter and the mechanical switch. Higher arc voltage in liquid arc is used for direct current limiting in the current limiter. The mechanical switch plays a role for final current interruption and insulation after interruption. We studied arc voltage in liquid arc stabilized with resin tube in some liquid materials (water, silicon oil, hydro fluoroether…). The arcing voltage more than 3kV was obtained with only 50mm gap. Fault current interruption in 10kV HVDC transmission system was simulated in EMTP/ATP with the new concept HVDC-CB using measured arc voltage. The HVDC-CB cannot interrupt the fault current due to lack of the limiting effect and arc voltage more than five times of the measured value is necessary for successful interruption. Further research will be performed for improvement of liquid arc voltages and necessary time for interruption.

Free Research Field

電力工学

Academic Significance and Societal Importance of the Research Achievements

本研究において、高電圧直流送電主回路用遮断器の新たな原理・コンセプトを提案した。液中アークの基本特性が明らかになり、アーク電圧を向上する手法を見出すことができた。これにより、新たな高電圧直流送電主回路用遮断器への適用可能性を確立することができた。
近年液体中プラズマは新しいプラズマとして注目されており、主にその反応場としての役割が注目されている。一方で、その物理的なメカニズムや放電形態、電流波形との相関、水以外のプラズマの特性など、まだ未知の部分も多い。本研究は、広く液体中プラズマの新しいアプリケーション開発に寄与する基盤作りの一助となることが期待される。