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영어

In this paper, in order to understand the characteristics of ignition caused by overload and overheating of motor among various factors of electric fire, we studied through ventilator used in various places such as restaurants and houses.It was able to identify the type of the ventilator by sampling the old ventilator which is used in various places, and it was possible to identify many kinds of ventilators which are damaged by the disconnection of the motor and the potential of the winding protection film and the interlayer short circuit,Experiments were conducted to forcibly restrain the rotating blades by using foreign substances to produce realistic situations and collect data such as the heat of the motor, the change of the current value, and the process of interlayer short-circuit and proved the fire hazard.And to utilize it as a basic data for the cause identification and as a fire investigation identification data.