電動機 燒損에 의한 火災 原因 分析에 關한 硏究
(A) study on the fire cause analysis of motor damage by a fire
전동기 소손 화재원인 원인분석;
- 원문 URL
According as modern industry is developed, national life level was improved. And the supply of various electrical appliances for the convenience is expanded in everyday life. Also, the electric power demand is increasing every year that is caused by the kind of electrical appliances and the variety of function. Electricity occupies important portion in modern life. And it work human's life conveniently and abundantly by clean and ideal energy. But, while it can enjoy convenience of life by these electrical energy, it is real condition that damage of mishap, calamity by this also hard to avoid. Specially, origination of fire among occasions that occupy the most parts is electricity fire. And it is electricity wiring fire and wiring equipment fire that dominate most portion in the electricity fires. In this study, dismantled electric motors that ignite overload impression right time and outside flame impression right time to single-phase induction motor which is basic part of general household electrical appliances. And it is observed that compare and analyze properties of winding part and change or no. And this study did experimental investigation about basic data of cause searching examination and fire memorial address of electricity fire. As a result, the trace by short circuit between layers was confirmed because there is lockout test time. Also, when one see with the naked eye, was wearing copper color except charred place. And organization of inner could know stiffness phenomenally. Also, time about temperature rise of winding part, change value is maximum temperature 377.9 [℃] that ignition time of washing machine electric motor ignites 86 minutes. And temperature curved line swing upward parabola and rose. Temperature curved line of electric fan electric motor and ventilation fan electric motor swing upward parabola and was rising. However, when compared with washing machine electric motor as ignition maximum temperature(321.4 [℃], 298.7 [℃]) that the height is small and ignites with each ignition time(108 minutes, 112 minutes) talks, it takes a lot of times. And could confirm that maximum temperature that ignite is low. The trace of a short circuit by heat was discovered in microphotograph and FE-SEM comparative analysis after when is stationary state and overload impression right time and metal formation size or state could confirm uneven. When approved outside flame to use combustibles in stationary state that run electric motor rotating axis, winding part was having red violet. And organization of inner does shape dissimilar to overload impression right time. This prove that reduction of inner wiring by sudden temperature rise. And form that inside microphotograph and FE-SEM also changes and cutting by strong flames of combustibles was seen. Also, electric current when was uncommitted an outside flame impression experiment on inside coil of color glow more. And organization of winding could know to get soft. Also, the microphotograph and FE-SEM picture could confirm that metal formation itself reduction is serious and melting traces appears clearly. Therefore, it is to prove ignition in machine that have winding, need as discover that winding was burnt evenly. Also, one need that find the trace by short circuit between layers. Sometimes, it is considered that should dismantle and compares and analyzes winding part according to necessity.