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백승명(Seung-Myeong Baek),곽민환(Min-Hwan Kwak),곽동순(Dong-Soon Kwag) 대한전기학회 2017 전기학회논문지 Vol.66 No.11
Bus bars are used in place of cables because they can carry more electrical energy with the same volume of conductors. This paper deals with the electrical properties of ceramic coating material for busbars. A ceramic coated samples were prepared for the electrical properties test. There are two types of samples. One is a sample without degradation, and the other is a sample degraded for 30 days. Four electrical properties tests were carried out in accordance with domestic standards. Four electrical characteristics tests are AC dielectric breakdown, V-t, lighting impulse dielectric breakdown, and discharge arc. Both samples showed excellent electrical properties, and the ceramic coating material is very good insulating materials for bus bar.
백승명,김해종,Baek, Seung-Myeong,Kim, Hae-Jong 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.5
In this paper, we study the insulating properties of the liquid nitrogen(LN2) including the thermal bubbles. The shape of the thermal bubbles in accordance with the current change was observed in the 77 K and 65 K LN2. According to the temperature of liquid nitrogen, bubbles were generated differently. The round shape of the bubble is occurred in 77 K LN2. But the layer shape of bubble is occurred in 65 K LN2. When the bubbles present, the dielectric strength of liquid nitrogen is low. However, the breakdown patterns were different according to the electrode arrangement. AC breakdown voltage(BDV) was lower than the DC BDV due to the influence of bubbles. Therefore, the design of a high-voltage superconducting equipments should consider the bubbles.
백승명,Baek, Seung-Myeong 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.6
We analyzed the correlation between breakdown voltage(BDV) of liquid nitrogen(LN2) and factors. The chosen factors affecting the breakdown are the diameter of electrode, gap length, temperature of LN2, and pressure of LN2. The BDV of LN2 was increased with increasing the diameter, the gap length and the pressure. And The BDV of LN2 was increased with decreasing the temperature. However, correlation coefficient was different from each other depending on the situation. The BDV exhibited a very high correlation coefficient of 0.92227 to dependence on the diameter. And a very high correlation coefficient of 0.94980 to dependence on the pressure under sphere(D 7.5 mm)-plane electrode. When the pressure is applied, sphere-plane electrode is the correlation coefficient was higher than that of the needle-plane electrode. It shows the dependence of a temperature coefficient of -0.758290 ~ -0.39946 under needle-plane electrode.
PL법 환경을 고려한 배전 케이블 종단부의 사고 유형 연구
백승명(Seung-Myeong Baek),최재형(Jae-Hyeong Choi),최진욱(Jin-Wook Choi),김영석(Young-Seok Kim),김선구(Sun-Gu Kim),김상현(Sang-Hyun Kim) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.10월
This paper introduces experimental investigates of an accident pattern for the distributing XLPE cable terminations considering PL law environment. The influence of defects such as thickness and length decrease of XLPE, the impurity on XLPE and the gap between stress-con of housing and semi-conductor on insulating properties of the termination have been studied. The thickness and length decrease of XLPE decrease ac breakdown strengths. Dielectric breakdown traces of XLPE that is damaged by knife displayed other shape. The gap of between housing and semiconductor deteriorates dielectric strength of XLPE seriously.
기계적 손상에 따른 6.6㎸케이블 종단부의 전기적 특성
백승명(Seung-Myeong Baek),최진욱(JIn-Wook Choi),김상현(Sang-Hyun Kim),김영석(Young-Seok Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
We show results that examine about electrical properties of XLPE insulated 6.6kV cable termination by mechanical damage. The cable used to produce the cable termination is 6/10㎸ tray XLPE fire retardant electric cable (6/10㎸ TFR-CV 35SQMM×1C) which is domestically made. We apply force to XLPE insulator and made mechanical defect using knife. Defected samples go through the withstand voltage test according to the IEEE std. 48 test regulations and lighting impulse (hereunder, IMP) withstand voltage test regulations. Then the effects of the scars shown during the construction process on electric accidents at the end part are analyzed.
PL법 환경을 고려한 배전 케이블 종단부의 전기적 사고 연구
김상현,최재형,최진욱,백승명,Kim, Sang-Hyun,Choi, Jae-Hyeong,Choi, Jin-Wook,Baek, Seung-Myeong 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.2
This paper introduces experimental investigates of an accident pattern for the distributing cross linking-polyethylene(XLPE) cable terminations considering product liability(PL) law environment. The influence of defects such as thickness and length decrease of XLPE, an impurity on XLPE and the gap between stress-con of housing and semi-conductor on insulating properties of the termination have been studied. The thickness and length decrease of XLPE decrease ac breakdown strengths. Breakdown traces of XLPE that is damaged by knife displayed ellipse shape. The gap of between stress-con and semiconductor deteriorates dielectric strength of XLPE seriously.
곽동순(Dong-Soon Kwag),백승명(Seung-Myeong Baek),곽민환(Min-Hwan Kwak) 대한전기학회 2017 전기학회논문지 Vol.66 No.11
This paper deals with the thermal and mechanical properties of ceramic coating material for bus bars. A ceramic coated samples were prepared for the mechanical properties test. There are two types of samples. One is a square shape and the other is a busbar shape. Each sample was deteriorated for 30 days to compare the thermal and mechanical properties with the non-degraded samples. Two thermal properties tests are TGA and flammability tests, and four mechanical properties tests are drop impact test, cross cut, tensile test, and bend test. The ceramic coating material was never damaged by impact and did not separate from aluminum in the cross cut test. In the tensile test, the breakage of the insulating material did not occur until aluminum fractured, and the breakage of the insulating material did not occur until the maximum load in the bending test. The decomposition temperature (melting point) of the ceramic coating material was higher than that of other epoxy insulators. This ceramic coating material is nonflammable and it has excellent fire stability.
배전급 케이블 종단부의 결점이 전기적 특성에 미치는 영향
김상현(Sang-Hyun Kim),최재형(Jae-Hyeong Choi),최진욱(Jin-Wook Choi),김영석(Young-Seok Kim),김선구(Sun-Gu Kim),백승명(Seung-Myeong Baek) 한국조명·전기설비학회 2009 조명·전기설비학회논문지 Vol.23 No.2
본 논문은 모의된 시공불량에 따른 결점을 가진 배전급 종단부의 전기적인 사고에 대하여 실험적으로 조사한 것을 나타낸다. 실험에 조립형과 열수축형인 두 개의 종단재를 사용하였다. 우리는 시공불량에 따른 모의 결점을 가진 케이블 종단부를 제작하여 교류 및 임펄스 내전압 시험과 같은 절연 특성을 고찰하였다. 두께 감소나 하우징의 스트레스콘과 반도전층 사이의 틈과 같은 결점의 영향에 대하여 연구하였다. 절연체의 두께 감소 시 교류 절연파괴 강도는 급격히 감소하였고 이 절연체의 절연파괴 흔적은 타원형으로 나타났다. 스트레스콘과 반도전층 사이의 틈은 절연내력애 매우 나쁜 영향을 주었다. 열수축형에서, 교류 절연파괴 전압은 가열 시간이 짧을 때 낮아졌다. This paper introduces experimental investigates of an electrical accident of the distributing cable termination with simulated a shoddy construction. We prepared two termination kites, one is built-in type, the other is heat contraction type. Also, we manufactured cable termination that have simulated defect by badness construction and investigated their insulation characteristics such as ac (35[㎸], 1[min]) and impulse (95[㎸], 1.2×50[㎲]) withstand test. The influence of defects such as thickness decrease, the gap between stress-con of housing and semiconductor and heating time on insulating properties of the termination have been studied. The thickness decrease of an insulator decreases ac breakdown strength suddenly and the breakdown traces of the insulator that is damaged by knife displayed elliptic shape. The gap of between stress-con and semiconductor deteriorates dielectric strength of insulator seriously. In heat contraction type, the ac breakdown voltage became low when the heating time is short.