이병설  최충석

Vol. 33,  No. 1, pp. 28-34, Feb.  2018
10.14346/JKOSOS.2018.33.1.28

battery fires diffusion jet flames flame stability Ionization NOx soot

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The purpose of this study is to fabricate a sensor module to detect the resistive leakage current (Igr) in real time that occurs to low voltage electric lines and to verify its reliability. In the case of the developed sensor module, wires are inserted into the zero current transformer (ZCT) and current transformer (CT) in advance and then the branch line is connected to the circuit breaker. The measurement result of the resistance of the distribution panel equipped with the developed sensor module shows that the resistance is 0.151mΩ between the R and R phases, 0.169 mΩ between the S and S phases, and 0.178 mΩ between the T and T phases, respectively. The insulation resistance measured at AC 500 V and 1,000 V is 0.08MΩ between the R, S, T and N phases, respectively. Then, the insulation resistance measured at DC 500 V is 83.3 GΩ between the R, S, T and G terminal, respectively. In addition, the applied withstanding voltage is AC 220 V/380 V/440 V and it was found that characteristics between all phases are good. This study measured the standby power by installing the developed sensor module at the rear of the MCCB and switching the circuit breaker on sequentially. The standby power is 1.350W when one circuit breaker is turned on, 1.690W when 2 circuit breakers are turned on, and 4.371W when 10 circuit breakers are turned on. This study also verified the reliability of the standby power of the distribution panel equipped with the developed sensor module using the Minitab Program (Minitab PGM). Since the analysis shows the statistical average of 1.34627 in the reliable range of normal distribution, standard deviation of 0.001874, AD of 0.554, and P value of 0.140, it is found that the distribution panel equipped with the developed sensor module has high reliability.