• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.11 no.2
• /
• pp.162-166
• /
• 1998

Synthetic fluid, class 7 group 2, as an insulating and cooling material is selected as. specimen, arid it is studied for the physical and electrical properties. Also, Benzotriazole(following as BT A) known as a suppressant of streaming electrification is added to it, and the change of physical and electrical properties by addition of BT A is investigated. From the spectrum of FT-IR, it is confirmed that the absorption peak in wavenumbers $3400{\sim}3450[cm^{-1}]$ is small or disappears when BTA is added. AC breakdown strength and volume resistivity of each specimen are investigated. It is considered that the effective content of BTA is about 10[ppm] for the suppression of electrification in this experiment.

• Applied Chemistry for Engineering
• /
• v.5 no.4
• /
• pp.722-730
• /
• 1994

The effects of antioxidant and carbon black on weatherability of crosslinked polythylene(XLPE) for electrical insulation were investigated. 16 compositions were prepared in other to determine the weathering resistance. Samples were exposed in xenon-arc lamp Weather-Ometer for 500, 1000, 1500, 2000 hours respectively. Tensile strength, elongation at break, dielectric strength and tan ${\delta}$ were measured to evaluate the weatherability of XLPE. The results indicated that the effect of carbon black was more prominent than antioxidant and synergistic effect, was observed when two additives were mixed.

• Proceedings of the KIEE Conference
• /
• 1999.07e
• /
• pp.2349-2351
• /
• 1999

In this paper, the variable absorption rates and DC dielectric breakdown strength of epoxy composites were measured at boiling absorption condition in order to observe the influences of moisture in out door use. Also, in order to improve withstand voltage properties at moisture absorbtion condition. IPN (interpenetrating polymer network) method which had been already reported, was introduced and the influence was investigated. As a result, it was confirmed that the moisture absorption rate was increased and DC dielectric breakdown strength was degraded with boiling time and filler content increasing. On the other hand, it was confirmed that moisture absorption rate and DC dielectric breakdown strength degrading rate were lowered by the improvement of adhesion strength In IPN specimens.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2008.06a
• /
• pp.256-257
• /
• 2008

Recently, with the increase of demand of electricity, electric cable or electric transfer machine are rapidly developed and meet the demand with the extra high voltage and massive capacity, the dangers of electrical accident of insulator are increasing by the electric stress, insulation degradation and insulation breakdown in insulator. In this paper, it is investigated that the temperature dependance of dielectric strength in nano-composites. We obtained that breakdown voltage of 0.4 [wt%] specimens is higher than the other $SiO_2$ content.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 1999.05a
• /
• pp.529-531
• /
• 1999

In this Paper, the variable dielectric breakdown strengths of epoxy composites were investigated at belling absorption condition in order to observe the influences of moisture in out door use. Also. in order to improve withstand voltage properties at moisture absorbtion condition, IPN(interpenetrating polymer network) method was Introduced and the Influence was investigated. As Adding filler(SiO$_2$) classified by o(phr), 50(phr) and 100[phr] to two kinds of matrix resin, six kinds of specimens were manufactured. As a result, it was confirmed that dielectric breakdown strength wer degraded with boiling time and filer content increasing. But, it was confirmed that dielectric breakdown strength degrading rate were lowered by the Improvement of adhesion strength in IPN specimens.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 1999.05a
• /
• pp.239-242
• /
• 1999

In this study, we evaluates the dependence of thickness and temperature in the breakdown strength of MDPE and effect of semiconductor. As the result, breakdown strength trend to decrease according to the increase of thickness and temperature but there is no dependence of temperature in the 70${\mu}{\textrm}{m}$ MDPE film. We obtained the result that the breakdown strength was a little lower in the structure of Semil/MDPE than Semi/MDPE/Semi, but breakdown strength of MDPE was greater both of all. Therefore we are investigating the effect of semiconductor in the breakdown strength.

• Electrical & Electronic Materials
• /
• v.3 no.3
• /
• pp.242-252
• /
• 1990

본 논문에서는 $Al_{2}$ $O_{3}$박막을 GAIVB(Gas Assisted and Ionized Vapour Beam)법에 의해 저온에서 300.angs.-1400.angs.의 두께로 성장하여 그 조건을 제시하였다. 아울러 Al-Al$_{2}$ $O_{3}$-Si의 MOS구조를 제작하여 Breakdown 현상을 고찰하고 그 결과를 분석 제시함으로써 GAIVB법에 의해 저온으로 형성된 $Al_{2}$ $O_{3}$막의 활용 가능성을 보고하였다. 한편, 본 연구에서 제작한 $Al_{2}$ $O_{3}$ 박막의 저항율은 막의 두께 100.angs.-1000.angs.인 시료소자에서 $10^{8}$ ohm-cm와 $10^{13}$ ohm-cm로 측정되었고 비유전율은 8.5-10.5, 절연파괴강도는 6~7 MV/cm(+바이어스)와 11~12MV/cm(-바이어스)이었다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
• /
• 2004.07a
• /
• pp.507-510
• /
• 2004

염해지역 배전선로의 나선 사용에 따른 안전사고방지 및 전력공급신뢰도 향상을 위하여 경동선 도체에 수밀 컴파운드를 충진하고 흑색의 가교폴리에틸렌으로 압출한 절연전선으로 염해지역의 특별고압 가공전선로에 사용하며 내부식성, 수밀성 및 전기 특성이 우수하다. 따라서 본 평가기술에서는 내트래킹, 인장강도, 우수침입방지성, 침적성, 통전내부식성, 교류파괴전압, 박리성, 밀착도 등의 주요한 시험에 대한 시험방법을 검토하고, 시험에 적용하여 시험 시 문제점을 도출하고 시험방법을 정립하고자 한다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.17 no.2
• /
• pp.66-72
• /
• 2003

The global assessment system for medium voltage power cable systems has been developed The minimum purpose of diagnostic activity is the economic discrimination and maintenance of bad cables which is likely to cause cable system failure. I have adapted the Aging Time Constant Method to construct the power cable assessment system for the diagnostic purpose. From the field application test and breakdown test results, it could be concluded that the diagnostic system was successful art convenient for the discrimination and maintenance of the bad cables, which is likely to fail sooner or later, economically.

• Proceedings of the KIEE Conference
• /
• 2000.07a
• /
• pp.555-557
• /
• 2000

원자력 발전소에서 사용되어지는 케이블은 전원 및 제어신호를 안정하게 전달하는 역할을 하며, 비상상태 발생시에는 원자로를 안전하게 shut-down시키는 통로 역할을 하므로 매우 중요하다. 케이블 상태 감시시 절연 및 피복재료는 종류 및 배합내용이 다양하기 때문에 종래의 자료로부터 전선과 케이블의 열화 또는 수명을 추정하기가 극히 어려우며 방사선에 노출이 되는 케이블의 경우 노화현상의 진행이 빠르고 방사선 열화로 수명이 단축되므로 국내 실정을 감안한 독자적인 검증방법 도출, 규제기술 기반 구축 필요 및 규제의 합리화와 효율화 필요성이 대두되고 있다. 기존에 사용해온 케이블 진단 방법에는 절연 파괴 강도 측정을 통한 노화진단, 산화 방지능력 측정을 통한 노화진단, 자켓 및 절연체의 판단, 연신율에 의한 노화진단, 케이블 Indenter에 의한 노화진단, 온도 및 방사선 등의 특정상태에 대한 평가, 유사한 환경조건에 대한 주기적 검토 등이 있다. 기존의 국내외 케이블 상태 감시방법을 조사 연구하므로서 케이블 열화에 대비한 수명관리 규제 기술 및 상태감시 (Condition Monitoring : CM) 기술의 평가 기준을 결정 하고자 한다.