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A Study on the Fabrication of the Sensor Module for the Detection of Resistive Leakage Current (Igr) in Real Time and Its Reliability Evaluation

실시간 Igr 검출을 위한 센서 모듈의 제작 및 신뢰성 평가에 관한 연구

  • Received : 2017.11.13
  • Accepted : 2018.02.08
  • Published : 2018.02.28

Abstract

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 $0.151m{\Omega}$ between the R and R phases, $0.169m{\Omega}$ between the S and S phases, and $0.178m{\Omega}$ between the T and T phases, respectively. The insulation resistance measured at AC 500 V and 1,000 V is $0.08m{\Omega}$ between the R, S, T and N phases, respectively. Then, the insulation resistance measured at DC 500 V is $83.3G{\Omega}$ 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 1.350 W when one circuit breaker is turned on, 1.690 W when 2 circuit breakers are turned on, and 4.371 W 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.

Keywords

sensor module;resistive leakage current;reliability evaluation;standby power;minitab PGM

References

  1. S. K. Lee, "Electrical Disaster Statistics in Korea", KESCO, 2016.
  2. Korean Standards Association, "KS C 61439-1, "Distributing and Control Board for Low Voltage", 2014.
  3. Korea Electrical Manufacturers Cooperative, "SPS-KEMC 2102-610, Low Voltage Distributing Board". 2008.
  4. Distribution Board System Association of Japan, "JSIA-300, Distribution Board Guide", 2010.
  5. C. S. Choi and S. Y. Hahn, "Study on the Resistivity Leakage Current Detection and Properties Analysis of Electrical Installation", 2008 Korean Institute of Electrical Engineers Fall Proceeding, pp.301-304, 2008.
  6. C. S. Kim, S. Y. Han and C. S. Choi, "Development and Safety Estimation of Resistive Leakage Current(Igr) of Detection Outlet", Trans. of the Korean Institute of Electrical Engineers, Vol.58P, No.2, pp.221-226, 2009.
  7. J. H. Lee and C. S. Choi, "Damage Pattern and Operation Characteristics of a Thermal Magnetic Type MCCB according to Thermal Stress", J. Korean Soc. Saf., Vol. 28, No. 3, pp. 69-73, 2013. https://doi.org/10.14346/JKOSOS.2013.28.3.069
  8. C. S. Choi, K. M. Shong, D. O. Kim, D. W. Kim and Y. S. Kim, "A Study on the Analysis of Heat and Metallurgical Structure of Connection Parts for Residual Current Protective Devices", Journal of Korean Institute of Fire Science and Engineering, Vol. 18, No. 4, pp. 57-63, 2004.
  9. J. H. Lee and C. S. Choi, "Damage Pattern and Operation Characteristics of a Thermal Magnetic Type MCCB according to Thermal Stress", J. Korean Soc. Saf., Vol. 28, No. 3, pp. 69-73, 2013. https://doi.org/10.14346/JKOSOS.2013.28.3.069
  10. B. S. Lee and C. S. Choi, "Study on the Evaluation of the Tension and Contact Resistance of a 3 $\Phi$ 3 W Plug-In MCCB", J. Korean Soc. Saf., Vol. 28, No. 4, pp. 43-47, 2013. https://doi.org/10.14346/JKOSOS.2013.28.4.043
  11. S. Y. Hanh, "Earth Resistance Leakage Current Meter", Republic of Korea Patent Office, 10-0771583, 2007.
  12. H. Makabe, "Introduction to Reliability Engineering", Japanese Standards Association, pp.183-194, 2010.
  13. H. Yoshida, "Failure Cause of Electronic Component and Its Measure", Nikkan Kogyo Shimbun, LTD., pp. 43-64, 2006.
  14. S. G. Seo et al, "Reliability Engineering", Kyobo Book Centre Ltd., pp.50-52,333-336,368-371, 2015.