수중 전격 과도현상 해석을 위한 ATPDraw 시뮬레이션

정종욱,정진수,Jung, Jong-Wook,Jung, Jin-Soo 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.6

본 논문에서는 전자과도현상 해석 프로그램인 ATPDraw를 이용한 사례연구로써 인체에 전격이 가해지는 순간의 과도현상을 해석하였다. 사례연구를 위한 2가지 전격 모델은 최악의 환경을 조성하고자 수중에서 발생하는 것으로 가정하였으며, 첫째, 인체가 수중에서 전원설비의 노출 충전부에 접촉하였을 경우와 둘째, 인체의 수족이 수중에서 동시에 대지에 접촉하는 경우를 모델링하였다. 모델링 후 각 사례에 대해 인체의 각 부위에서의 계산된 전압, 전류를 비교하여 전격 순간의 과도현상을 해석하였다. 첫 번째 모델에 대한 해석 결과, 인체가 수중 노출충전부에 촉수시 순간적인 과도현상이 발생하며, 이때의 전압, 전류는 촉수 전후보다 현저히 증가되는 것을 확인하였다. 그러나 이 현상은 지속시간이 매우 짧아 통전전류와 시간의 적이 안전한계 이내임을 감안할 때, 수용가의 상용전압에서의 전격의 영향은 그다지 크지 않을 것으로 사료된다. 두 번째 모델에서는 인체의 수족이 대지에 동시에 접촉했을 경우, 접촉 순간 인체에 유기되는 전압의 크기는 전반적으로 감소되었으나, 가슴 부위를 통과하는 전류량이 급증하였다. 그러나 그 크기가 작고 지속시간이 짧아 인체에 미치는 전격의 영향은 미미할 것으로 사료된다. 결국 두 경우 모두 전압의 크기, 인체 임피던스에 따라 전격의 영향이 좌우될 것으로 판단된다. This paper describes the analysis of transient phenomena on the point that a human body suffers an electrical shock. A couple of case studies were discussed by using an ATPDraw simulation tool. Two models for the case studies were constructed on the assumption that the electrical shock event takes place under water to simulate the severest condition ; the first model that the human body contacts with an energized part exposed to water ; the second model that both hands and feet simultaneously contact with the ground under water. After modeling, the transient phenomena for the models were analyzed by comparing the voltages and currents calculated at each part of the human body. As a result steep front kicks in voltage and current were observed as transient phenomena on the point that the human body contacts with the energized part exposed to water in the first model and the magnitudes of the kicks considerably increased. It was considered however, the effect of the kicks due to the commercial power source on the human body could be neglected because the product of the current through the body and the short duration is less than the safety limit. When both hands and feet simultaneously contact with the ground in the second model, the voltage generally decreased all over the body parts, while the current flowing through the chest abruptly increased. The duration of this current was very shot, as well, thus its effect on the electrical shock is considered insignificant. After all, it was confirmed through the simulation results that the electrical shock depends on the magnitude in voltage and the body impedance.

침수 상용전원에 의한 감전위험성 검토

정종욱,정진수,Jung, Jong-Wook,Jung, Jin-Soo 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.6

본 논문에서는 상용전원이 침수되었을 경우, 이에 의한 인체 감전의 위험성을 실증실험을 통해 검토하였다. 실험을 위해 한쪽 벽면에 노출된 충전부가 설치된 모의수조를 구축하고 내부에 도전성 수용액을 채운 후, 전원으로부터의 거리, 방향, 도전성 수용액의 전도율 및 수위에 따른 전위를 측정하였다. 실험 결과 수중에 설치된 전원장치로 인한 전위분포는 거리에 따라 달라지지만, 침수 수용액의 도전율, 노출된 충전부로부터의 각도 및 측정높이는 전기적으로 미치는 영향이 거의 없음이 확인되었다. This paper describes a risk assessment of electric shock based on a experiment which demonstrates a submerged commercial power source. For the experiment a water tank was made and an outlet was installed on an interior wall. After filling the tank with a conductive water solution, the electric potential was measured with the distance, the direction from the power source, the conductivity and the level of the water solution. As a result, the potential distribution due to the outlet energized and exposed to the water solution depends on the distance from the submerged power source, however, the direction from the power source, the conductivity and the level of the water solution seemed to scarcely affected on the electrical shock risk.

PE 계열 절연재 전기적 특성 평가

정종욱,정진수,한운기,Jung, Jong-Wook,Jung, Jin-Soo,Han, Woon-Ki 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.5

This paper describes the results of electrical characteristics assessment for organic insulations of polyethylene(PE) series insulations and acrylonitrile butadiene styrene copolymer(ABS). In the experiment, 4 kinds of specimens by composition density were tested in relative permittivity, specific resistance and tracking duration. A WinDETA system and a tracking test set manufactured for this assessment were used to measure the dielectric parameters and tracking duration, respectively. In measuring the tracking duration, the time from testing voltage application to testing circuit breaking due to the tracking current was measured. As a result, dielectric dispersion was observed in measuring the relative permittivity of ABS. It was confirmed that the relative permittivity decreased with the density of the PE series insulations and it depends rather on the temperature than frequency. In most specimens, specific resistance exponentially decreased with frequency and the result for each specimen was almost similar. By the way, in the tracking test, all the PE series insulations showed more excellent performance than ABS and especially in the case of HDPE, its tracking withstand performance was the best.

다른 굵기의 6/10[kV]급 CV 케이블 직선접속부 안전성 평가

정종욱,김선구,정진수,Jung, Jong-Wook,Kim, Sun-Gu,Jung, Jin-Soo 한국조명전기설비학회 2010 조명·전기설비학회논문지 Vol.24 No.10

This paper describes the safety assessment of power cable splices connecting different sized 6/10[kV] class power cables. To assess the safety, AC withstand voltage tests, partial discharge tests and impulse tests were carried out to the cable splice specimens and thermal rise due to overload and cross section of joint were examined as well. As a result, a breakdown due to the $4.5[U_0](27[kV_{ac}])$ application could not found for 5 minutes. Under $1.73[U_0](10.4[kV_{ac}])$ application, partial discharges of 4~8[pC] were detected. In impulse tests, all the specimens withstood to the standard waveforms of $75[kV_{peak}](1.2{\times}50[{\mu}s])$ without any breakdowns. In addition, the temperature on the splice rose by $3[^{\circ}C]$ when the 200[A] flew through the splice for 20minutes, however the thermal rise of $3[^{\circ}C]$ was considered due to the atmospheric temperature. After all the electrical tests, the cross section of the splice was visually examined. The conditions of the conductors of both $185[mm^2]$ and $240[mm^2]$ were good.

A Study on the Breakage Causes of Toughened Glass Stem Insulators

정종욱(Jong-Wook Jung),정진수(Jin-Soo Jung),송길목(Kil-Mok Shong),김영석(Young-Seok Kim),김선구(Sun-Gu Kim),임동훈(Dong-Hoon Lim),유영태(Young-Tae Ryu),전용주(Yong-Joo Jeon) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.7(초록집)

태양광 패널 최소 임계출력 음영비 결정

정종욱(Jong-Wook Jung),정진수(Jin-Soo Jung),김선구(Sun-Gu Kim) 한국조명·전기설비학회 2010 조명·전기설비학회논문지 Vol.24 No.10

In this paper, the shading ratio about to output the minimum critical power of a photovoltaic panel was determined by experiment and simulation. A 2.475[㎾] poly-crystalline photovoltaic panel consisting of 11 modules was used in the experiment and its surface was covered with shading curtains, thus the amount of light incident to the modules were controlled. In order to compare with the experimental results, the experimental circuits were modelled with the CASPOC (power electronics electrical drives simulator) and module parameters were applied to it, by which the minimum critical power was calculated. As a result, the photovoltaic panel was about to generate the power when the 5th shading curtains were removed from the module surface, after then the output power linearly increased by removing the shading curtains. In addition, the CASPOC simulation results were similar to the experimental results in the abrupt decreasing pattern of power.

국내 보안등 운용실태 조사

정종욱(Jong-Wook Jung),정진수(Jin-Soo Jung),김선구(Sun-Gu Kim) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.5월

In this paper, the recent technologies of a guardlamp are surveyed and the research on the actual condition of the management and maintenance is carried out. In addition, this paper intends to arouse people s attention to the electrical disasters caused by neglecting the installation, operation, management and maintenance of the guardlarnp. In the process of the research, a field survey, a meeting of interested persons and manufacturers were performed and their opinions were reflected.

태양광 이종 모듈 발전출력 분석

정종욱(Jong-Wook Jung),김선구(Sun-Gu Kim),정진수(Jin-Soo Jung),문정선(Jung-Sun Moon) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7

This paper describes the comparison and analysis of generating power of different photovoltaic modules. 2 mounted modules of a mono crystalline type and a thin film type with 2.5㎾ each were installed and their generating power was acquired and analyzed by hour. As a result, the total generating power was varied by solar radiation and available time. In addition, the generating power of the thin film type was greater than that of the mono crystalline type when the solar radiation was more than 900W/㎡.

캐나다 BC주의 전기안전 시스템

정종욱(Jong-Wook Jung),김선구(Sun-Gu Kim) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.9

본 논문에서는 캐나다 중서부에 위치한 BC(British Columbia)주 및 AB(Alberta)주의 수용가 전력설비에 대한 전기안전 시스템에 대해 고찰하였다. 캐나다의 전기안전은 주정부 권한을 위임받은 안전청에서 담당하여, 세부적인 안전관리는 각 주마다 절차 상 약간의 차이는 있었지만, 전체적으로는 전기안전이라는 큰 틀 안에서 동일한 맥락으로 통제되고 있었다. 또한, 국내에 비해 전기안전 교육 프로그램 및 홍보가 상당히 강화되어 있음을 알 수 있었다.

커패시터용 MPPF의 교류전압 인가시 전기적 특성

정종욱(Jong-Wook Jung),곽희로(Hee-Ro Kwak),박중신(Jung-Shin Park) 한국조명·전기설비학회 2000 한국조명·전기설비학회 학술대회논문집 Vol.2000 No.-

This paper describes the self healing characteristics of metalized polypropylene film(MPPF) under ac condition. PDs were generally observed at relatively low voltage, and the PDIVs were differently varied depending on the number of pre-self healing due to void defects. Several pre-self healing events took place at lower voltage than the critical breakdown voltage of PPF. Self healing mainly occurred at pin tips, wrinkle sides, and cross points of wrinkles. The applied voltage at self healing was increased with PPF thickness. The burn out area at self healing was also increased with the applied voltage and PPF thickness. The peak currents in a grounding conductor at self healing was also increased with the applied voltage.