Development of a detection method of electric fire sign and a continuous remote monitoring system

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04023
• 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: Nagoya Institute of Technology
• Principal Investigator: MIZUNO Yukio 名古屋工業大学, 工学(系)研究科(研究院), 教授 (50190658)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 電気機器火災 / トラッキング / 半断線 / 短絡 / ねじの緩み / 伝導ノイズ / 火災未然防止

Outline of Final Research Achievements

Tracking of attachment plugs, short-circuit of damaged power-supply cords of household appliances, and overheating due to the screw slackening of a circuit breaker are the main causes of fire accidents originating from electrical equipment in domestic and industrial environments. Thus, safety devices for detecting such damages in wiring appliances are required to prevent fire incidents.
In this study, the three phenomena were reproduced in the laboratory, and investigated paying attention to the conducted emission spectrum. An increase in the conducted emission levels in a certain frequency range was observed in experiments, which may be attributed to discharge. A possibility was found that the level of conducted emissions can indicate the initiation and progression stages as well as the final stage of the three phenomena. The proposed technique based on the level has potential for detection of damage in wiring appliances before it results in fire outbreaks.

Free Research Field

電気絶縁工学

Academic Significance and Societal Importance of the Research Achievements

差込みプラグのトラッキング、電源コードの半断線による短絡、導体接続部のねじの緩みによる過熱は電気機器火災の主原因であり、家庭や工場などで身近で生じる現象である。しかしながら、信頼性の高い火災未然防止技術は確立されていない。
本研究ではこれらの現象を実験室で再現し、伝導ノイズに基づく検出手法を示した点に学術的価値がある。正常時に比べた伝導ノイズレベルの上昇程度により、発火・短絡（火災発生直前・直後の段階）のみならず予兆（火災に至る異常の初期・中期段階）の検出が可能であることを明らかにした。伝導ノイズの常時遠隔監視により電気機器火災を大幅に低減させ得る可能性があり、社会的意義は大きい。