Development of DC arc interruption method using polymer and silica sand for high interrupting capacity of DC fuses

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K14141
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 21010:Power engineering-related
• Research Institution: Nagoya University
• Principal Investigator: Kodama Naoto 名古屋大学, 工学研究科, 助教 (80828971)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: アーク / ヒューズ / 消弧媒体 / 熱プラズマ

Outline of Final Research Achievements

The present study investigated a new current-limiting interrupting method for arc discharges formed in current-limiting fuses. A simulated fuse with a narrow part made of light-curing resin was designed and used for quenching of the arc discharges. As a result of the experiment, compared to silica sand which has been conventionally used as an arc quenching medium for current-limiting fuses, the new method successfully increased arc resistance during the arc quenching process and shortened the arc quenching time. The reason for the increase in arc resistance in this method was examined by simulating the gas characteristics of the arc. As a result, it was found that the electrical resistivity and heat dissipation of the arc increased due to the polymer vapor mixing into the arc, and as a result, the arc resistance increased.

Free Research Field

電力機器

Academic Significance and Societal Importance of the Research Achievements

本研究の結果、数十年間の間、限流ヒューズのアーク消弧媒体として用いられてきた珪砂に加えて、高分子材で作成した狭隘部とアークの物理的な接触および溶発によるアークの物性の変化を利用することで、限流ヒューズのアーク遮断容量の更なる高容量化が見込めることが判明した。本成果は、再生可能エネルギーの導入において必須となる直流系統の実現と保護に対して資する成果となっている。