Journal of the Society of Disaster InformationISSN:1976-2208(Print) 2671-5287(Online)한국재난정보학회

Purpose: To inform the danger of fire as the installation of freezing warehouse similar to the principle of refrigerator increases. Method: The fire probability of the control panel was high, and the risk of fire was examined through a reproducing experiment centering on the magnetic contactor. For this purpose, experiments were conducted on temperature changes of MC due to overcurrent, switching, coil deterioration, poor contact, and tracking of partial contact terminals. Result: Experimental results showed that the risk of ignition was not high in the measurement of temperature change of MC due to overcurrent and switching, but the durability degradation effect was expected, and the risk of ignition was largely confirmed in the experiments due to deterioration, poor contact, and tracking. Conclusion: After measuring the MC part of the defrost heater in the state of applying voltage with thermal imaging camera, 139.4℃ was measured after 5minutes and when it rose to 194V, 157.3℃ was measured and the voltage was gradually increased for 10minutes. Let's stop the operation after the flame generated with smoke inside, and the internal temperature was measured at 168.2℃ and proved the danger through the reproducing experiment.