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은희림,김용운,고재선 한국화재감식학회 2017 한국화재감식학회 학회지 Vol.8 No.1
Agricultural mechanization has created conditions for high productivity in spite of declining rural labor force due to industrialization. These farming systems are funded by the government, but they are limited to a certain extent, so farmers also invest a considerable amount of capital to purchase agricultural machinery. Especially in the case of a tractor, the economic loss is expected to be a heavy burden for the farmers if the use period is more than 10 years and a fire occurs and disappears. This study focuses on the actual use of the control board of the tractor, Specific phenomena depending on the type of combustion observed at the fire scene, and Experiments were conducted to reproduce the judgment of the ignition area to prove the possibility of ignition. Experiments were conducted to reproduce the judgment of the ignition region, thereby proving the possibility of ignition, I would like to present sufficient evidence on the cause of fire cause of old tractor.
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은희림,라명순,이정훈 한국화재감식학회 2017 한국화재감식학회 학회지 Vol.8 No.2
This paper reproduces the possibility of accidents and electric fires in the magnetic contactor(MC) of the control panel installed for the temperature control of the freezing warehouse, the low temperature warehouse and the storage. In addition, I would like to present a method for analyzing the characteristics and causes of accidents that occur due to an under voltage applied to a MC or an abnormal operation due to a foreign substance being interrupted. The inside of the control panel is composed of a molded-case circuit breaker(MCCB), a magnetic contactor(MC), a timer, and a terminal board. The MC for compressor and the MC for compressor control are designed to operate sequentially. The deterioration of the MC is caused by undervoltage and overvoltage, physical shock or vibration, inflow of foreign substances such as cockroaches and insects, formation of water or moisture. In other words, the inflow of foreign matter breaks the balance of the electromagnetic field of the MC and interferes with the formation of the magnetic path, so that heat and vibration are continuously generated and the function of the contact point is deteriorated. Therefore, in this paper, we analyze the ignition mechanism of MC and use it as fire detection data for the control panel for the refrigeration warehouse.
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조직 분석(ASTM E1382)에 의한 용융흔 정량적 판별 연구
은희림,김용범,정승태,홍춘호 한국화재감식학회 2023 한국화재감식학회 학회지 Vol.14 No.1
The molten marks of electrical wiring found at the fire site can be helpful in inferring the cause of the fire and the ignition point, and it is a very important piece of evidence. However, in the fire department, there are few cases of quantitative analysis and study on the texture of molten marks. In this study, based on the ASTM E1382 standard, using an analysis program called iSolution DT, the image taken with an electron microscope is analyzed and quantitatively determined. In a energized state, the electric wiring was short-circuited at 25°C and 600°C to form molten marks. The primary melt scar shorted at 25°C showed a small columnar structure major axis ratio (GAR), and the secondary melt scar shorted at 600°C showed a large major axis ratio (GAR). As a result, it will be very helpful in quantitatively classifying primary and secondary melt traces using isolution DT.
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콘센트 전원 접속구 화재 발생 메커니즘 고찰과 새로운 감식 방법 제시
박진영,방선배,은희림,오세혁,이유빈,고영호 한국화재소방학회 2020 한국화재소방학회논문지 Vol.34 No.3
Most outlet fires occur around plug pins and plug pin receivers. However, no research has been conducted on ignitionsat power connection points. This study confirms the possibility of ignition after incomplete connection, using a strandedwire, to the power connection point of an outlet. The experiment was divided into basic and reproducing experiments. Thebasic experiment confirmed the possibility of ignition according to the number of wire strands connected to the powerconnection point, and it identified the characteristics of the residue after the fire. In the reproducing experiment, lamps,vacuum cleaners, and heaters were connected to an outlet to check if the ignition at the connection advanced into a fire. The fire advanced due to the heat and arc generated at the connection point, and partial losses were identified in the U-typeholder and clip. Accordingly, the results demonstrate that a fire may occur when the stranded wire is incompletelyconnected to the outlet. Moreover, it was confirmed that the cause of a fire can be determined based on the characteristicsof the residue. 대부분의 콘센트 화재는 플러그 핀과 핀받이 주변에서 발생하는 것으로 알려져 있다. 하지만, 플러그 접속점 이외에 콘센트의 전원 접속구에서도 화재가 발생할 수 있다는 것을 간과하면 안 된다. 본 연구에서는, 전원 접속구에 연선이 불완전하게 접속될 때, 발화 가능성을 확인하였다. 실험은 기초실험과 재현실험으로 나누어 진행하였다. 기초실험은 접속구에 체결되는 연선의 가닥 수에 따른 발화 가능성을 확인하고 잔존물의 특징을 파악하였다. 재현실험은전등, 청소기, 히터 등의 부하를 콘센트에 연결하고 접속구에서의 발화가 화재로 진전되는지 확인하였다. 실험 결과,접속구에서 발생한 발열과 아크로 인해 화재로 진전되었고, 잔존물인 U-자 고정금구와 클립에서 부분적 손실이 식별되었다. 이에 따라, 연선을 사용한 전기배선이 콘센트에 불완전 접속되었을 때, 화재의 발생 가능성을 증명하였고,잔존물의 특징으로부터 화재원인을 판정할 수 있다는 것을 확인하였다.
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