• Title, Summary, Keyword: Dielectric breakdown time

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Time-Dependent Dielectric Breakdown of a Polycrystalline and a Multilayered $BaTiO_3$ Thin Films (다결정 및 다층구조 $BaTiO_3$ 박막의 Time-Dependent Dielectric Breakdown 특성)

  • Oh, Jeong-Hoon;Song, Man-Ho;Lee, Yun-Hi;Park, Chang-Yub;Oh, Myung-Hwan
    • Proceedings of the KIEE Conference
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    • pp.1526-1528
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    • 1996
  • The dielectric reliability of a polycrystalline and a multilayered $BaTiO_3$ thin films was evaluated using a time-zero dielectric breakdown (TZDB) and a time-dependent dielectric breakdown (TDDB) techniques. The $BaTiO_3$ thin films were prepared by rf-magnetron sputtering technique on ITO-coated glass substrates. In case of the multilayered $BaTiO_3$ thin film, the dielectric breakdown histogram, which was obtained from the TZDB measurements, showed a typical Weibull distribution. While in case of polycrystalIine $BaTiO_3$ thin film, a randomly distributed dielectric breakdown histogram was observed. The TDDB results of the multilayered $BaTiO_3$ thin film guaranteed about $10^5$ hours-operation under the stress field of 1 MV/cm.

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The Estimation of the Dielectric Strength Decrease of the Solid-solid Interfaces by using the Applied Voltage to Breakdown Time Characteristics

  • Shin, Cheol-Gi;Bae, Duck-Kweon
    • Transactions on Electrical and Electronic Materials
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    • v.8 no.6
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    • pp.278-282
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    • 2007
  • In the complex insulation system that is used in extra high voltage(EHV) devices, according to the trend for electric power equipment of high capacity and reduction of its size, macro interfaces between two different bulk materials which affect the stability of insulation system exist inevitably. In this paper, the dielectric strength decrease of the macro interfaces between epoxy and ethylene propylene diene terpolymer(EPDM) was estimated by using the applied voltage to breakdown time characteristics. Firstly, the AC short time dielectric strength of specimens was measured at room temperature. Then, the breakdown time was measured under the applied constant voltage which is 70% of short time breakdown voltage. With these processes, the life exponent n was determined by inverse power law, and the long time breakdown voltage can be evaluated. The best condition of the interface was LOS(low viscosity(350 cSt) silicone oil spread specimen). When 30 years last on the specimens, the breakdown voltage was estimated 44% of the short time breakdown voltage.

Time-Dependent Dielectric Breakdown Characteristics of Thin $SiO_2$ Films and Their Correlation to Defects in the Oxide (얇은 산화막의 TDDB 특성과 막내의 결함과의 상관성)

  • Sung, Yung-Kwon;Choi, Jong-Ill;Kim, Sang-Yung;Han, Sung-Jin
    • Proceedings of the KIEE Conference
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    • pp.147-150
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    • 1988
  • Since the integration level of VLSI circuits progresses very quickly, a highly reliable thin $SiO_2$ film is required to fabricate a small-geometry MOS device. In the present study we have attempted to eliminate the failure-causing defects that develop in thin oxide films during the oxidation step by performing a long-time preoxidation and postoxidation annealing. The TDDB test and the copper decoration method were used to calculate the oxide defects density of MOS device. The dielectric reliability of high-quality thin oxides have been studied by using the time-zero-dielectric-breakdown (ramp-voltage-stressed I-V) and time-dependent-dielectric -breakdown (Constant-stressed I-V) tests. Failure times against temperature and electric field are examined and acceleration factors are abtained for each parameter. Based on the data obtained, breakdown wearout limitation for thin oxide films is estimated.

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The variation of water absorption rate and DC dielectric breakdown strength of Epoxy composites due to filler content (충진재 함량 변화에 따른 에폭시 복합재료의 흡수율과 직류 절연파괴강도의 변화)

  • Lee, D.J.;Kim, T.Y.;Shin, S.K.;Kim, M.H.;Kim, K.H.;Kim, J.H.
    • Proceedings of the KIEE Conference
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    • pp.2349-2351
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    • 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.

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The variations of AC dielectric breakdown strength of epoxy composites due to boiling absorption (비등흡수에 따른 에폭시 복합체의 교류 절연파괴강도의 변화)

  • 이덕진;김경민;김탁용;손인한;신성권;김경환;김재환
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.529-531
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    • 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.

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Effect oh Heat Treatment on Breakdown Properties in the Joint Interface of Power Cables (전력케이블 절연접속계면의 절연파괴 특성에 미치는 열처리 효과)

  • 이창종;김진수;박강식;한상옥
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.11 no.7
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    • pp.502-507
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    • 1998
  • The purpose of this study is to investigate the breakdown properties in joint interface of power cables with heat treatment. The specimens have the structure of XLPE/EPDM interface like the joint of distribution power cable. The breakdown characteristics of the SLPE/EPDM joint were studied with crosslinking by=products. AC breakdown voltages were measured with heat treatment time and interfacial materials and crosslinking by-products as testing factors. This study has shown that crosslinking by-product gases play an important role at the insulation properties of cable joints by heating. The dielectric strength shows the lowest values at 4 hours heat treatment. The AC breakdown strength in the untreated sample was increased with heat treatment time.

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Percolation Threshold and Critical Exponent of Dielectric Breakdown Strength of Polyethylene Matrix Composites added Carbon Black (카본블랙 첨가 PMC(Polyethylene Matrix Composites)의 문턱스며들기(Percolation Threshold)와 절연파괴 강도 임계지수)

  • Shin, Soon-Gi
    • Korean Journal of Materials Research
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    • v.21 no.9
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    • pp.477-481
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    • 2011
  • Composites of insulating polyethylene and carbon black are widely used in switching elements, conductive paint, and other applications due to the large gap of resistance value. This research addresses the critical exponent of dielectric breakdown strength of polymer matrix composites (PMC) made with carbon black and polyethylene below the percolation threshold (Pt) for the first time. Here, Pt means the volume fraction of carbon black of which the resistance of the PMC is transferred from its sharp decrease to gradual decrease in accordance with the increase of carbon-black-filled content. First, the Pt is determined based on the critical exponents of resistivity and relative permittivity. Although huge cohesive bodies of carbon black are formed in case of being less than the Pt, a percolation path connecting the conducting phases is not formed. The dielectric breakdown strength (Dbs) of the PMC below Pt is measured by using an impulse voltage in the range from 10 kV to 40 kV to avoid the effect of joule heating. Although the observed Dbs data seems to be well fitted to a straight line with a slope of 0.9 on a double logarithm of (Pt-$V_{CB}$) and Dbs, the least squares method gives a slope of 0.97 for the PMC. It has been found that finite carbon-black clusters play an important role in dielectric breakdown.

Dielectric Properties of Modified Epoxy Resins under Inhomogeneous Electric Field (개질된 에폭시 수지계의 불평등 전계하에서 절연특성)

  • An, Hyun-Soo;Shim, Mi-Ja;Kim, Sang-Wook
    • Proceedings of the KIEE Conference
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    • pp.1585-1587
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    • 1996
  • The dielectric properties of DGEBA/MDA/GN system under inhomoneous electric field were investigated. As GN contents increased, impact strength increased, but dielectric breakdown strength decreased. At $150^{\circ}C$, the dielectric breakdown strength decreased and uniformly maintained with the increment of distance between two electrodes. The life-time of epoxy resin increased with the decrement of applied voltage, but dielectric breakdown didn't occur below specific applied voltage.

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Characteristics of Dielectric Breakdown in Liquid Nitrogen (액체질소의 절연파괴특성)

  • 추영배;류경우;류강식;김상현
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.37 no.12
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    • pp.872-878
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    • 1988
  • During the past few years, a great deal of attention has been directed to the application of superconductivity to the electrical systems such as superconducting power transmission lines, superconducting magnet energy storage and so on. Yet in order to develop the practical model of these electrical equiqments utilizing suprconductivety and other phenomena at cryogenic temperautre, it is necessary to know the dielectric behaviour of insulating materials at cryogenic temperature in view of reliability, safety and economy of these machines. Investigation of dielectric properties of cryogenic liquids is very important due to the dual role of those as the dielectric and cooling medium. In this study, we investigated results measured over several kinds of dielectric characteristics of liquid nitrogen taking into consideration for application of high Tc superconductor. Dependence of breakdown voltage of gap width, polarity and pressure is reported in this paper and time delay characteristics of breakdown is also the subject of this discussion.

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The Formation and Characteristics of Laser CVD SiON Films (Laser CVD에 의한 SiON막의 형성과 그 특성)

  • Kwon, Bong-Jae;Park, Jong-Wook;Cheon, Young-Il;Lee, Cheol-Jin;Park, Ji-Soon;Sung, Yung-Kwon
    • Proceedings of the KIEE Conference
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    • pp.241-244
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    • 1991
  • In this paper, we introduced Silicon Oxynitride films deposited by Laser CVD, and evaluated the electrical breakdown of these films by TZDB(Time Zero Dielectric Breakdown) and TDDB(Time Dependent Dielectric Breakdown) test. In addition, high frequency C-V test was done in order to calculate hysterisis and flatband voltage(before and after electric field stress). Failure times against eletric field are examined and electric field accelation factor $\beta$ are obtained, and long term reliability was also described by extrapolating into life time in the operating voltage(5V). In this experiments, the deposited films with increased temperature represented small flatband voltage, hysterisis and favorable breakdown characteristics, this is why the hydrogen in the film was decreased and the film was densified, long term reliability was good in the laser CVD SiON films.

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