• 제목/요약/키워드: J-V Characteristics

검색결과 720건 처리시간 0.036초

The study on the Long-Term overvoltage test of EHV Gas Voltage Transformer (초고압 GAS Voltage Transformer의 장기 과전압 시험에 관한 연구)

  • Song, H.S.;Park, K.W.;Keu, G.S.;Jung, J.G.
    • Proceedings of the KIEE Conference
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    • 대한전기학회 2002년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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    • pp.157-159
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    • 2002

  • In order to obtain reliability and extend life of GAS Voltage Transformer in GIS, it has to prevent aging by overvoltage considered to insulation characteristics of insulating material. This paper describes some characteristics of V-T characteristics and partial discharges.

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Experimental for Performance of electron 9un cathode electrode (Y-824) characteristics (전자총 캐소드전극(Y-824)의 특성실험)

  • Son, Y.G.;Kwon, S.J.
    • Proceedings of the KIEE Conference
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    • 대한전기학회 2006년도 제37회 하계학술대회 논문집 C
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    • pp.1552-1553
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    • 2006

  • A thermionic gun of injector linac for pohang accelerator laboratory is required to generate beam pulse width less than 1 nsec. The gun uses cathode-grid assembly(EIMAC Y824) and operates up to 80 kV anode voltage. In order research characteristics of the electron gun, emission current from gun wear measured by the wall current monitor. In this paper the pulser system and characteristics of the emission current in region from 30 mA to 15 A are described.

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Design and Operation Characteristics of 2.4MJ Pulse Power System for Electrothermal-Chemical(ETC) Propulsion(I) (전열화학추진용 2.4MJ 펄스파워전원의 설계와 동작특성(I))

  • Jin, Y.S.;Lee, H.S.;Kim, J.S.;Cho, J.H.;Lim, G.H.;Kim, J.S.;Chu, J.H.;Jung, J.W.;Hwang, D.W.
    • Proceedings of the KIEE Conference
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    • 대한전기학회 2000년도 하계학술대회 논문집 C
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    • pp.1868-1870
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    • 2000

  • As a drive for an ETC (Electro-thermal Chemical) launcher, a large pulse power system of a 2.4MJ energy storage was designed, constructed and tested. The overall power system consists of eight capacitive 300kJ energy storage banks. In this paper we describe the design features, setup and operation test result of the 300kJ pulsed power module. Each capacitor bank of the 300kJ module consists of six 22kV 50kJ capacitors. A triggered vacuum switch (TVS-43) was adopted as the main pulse switch. Crowbar diode circuits, variable multi-tap inductors and energy dumping systems are connected to each high power capacitor bank via bus-bars and coaxial cables. A parallel crowbar diode stack is fabricated in coaxial structure with two series 13.5kV, 60kA avalanche diodes. The main design parameters of the 300kJ module are a maximum current of 180kA and a pulse width of 0.5 - 3ms. The electrical performances of each component and current output variations into resistive loads have been investigated.

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Parameter Study for the Analysis of Impact Characteristics considering Dynamic Material Properties (동적 물성치를 고려한 V.I. 충격인자의 영향 분석)

  • Lim, J.H.;Song, J.H.;Huh, H.;Park, W.J.;Oh, I.S.;Choe, J.W.
    • Proceedings of the KSME Conference
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    • 대한기계학회 2001년도 춘계학술대회논문집A
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    • pp.945-950
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    • 2001

  • Vacuum interrupters that is used in various switchgear components such as circuit breakers, distribution switches, contactors, etc. spreads the arc uniformly over the surface of the contacts. The electrode of vacuum interrupters is used sintered Cu-Cr material satisfied with good electrical and mechanical characteristics. Because the closing velocity is 1-3m/s, the deformation of the material of electrodes depends on the strain rate and the dynamic behavior of the sintered Cu-Cr material is a key to investigate the impact characteristics of the electrodes. The dynamic response of the material at the high strain-rate is obtained from the split Hopkinson pressure bar test using cylinder type specimens. Experimental results from both quasi-static and dynamic compressive tests with the split Hopkinson pressure bar apparatus are interpolated to construct the Johnson-Cook equation as the constitutive relation that should be applied to simulation of the dynamic behavior of electrodes. To evaluate impact characteristic of a vacuum interrupter, simulation is carried out with five parameters such as initial velocity, added mass of a movable electrode, wipe spring constant, initial offset of a wipe spring and virtual fixed spring constant.

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The Effect of Boron Doped CdS Film on CdS/CdTe Solar Cell (CdS 박막의 boron doping에 따른 CdS/CdTe 태양전지 특성)

  • Lee, H.Y.;Lee, J.H.;Kim, J.H.;Park, Y.K.;Shin, J.H.;Shin, S.H.;Park, K.J.
    • Proceedings of the KIEE Conference
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    • 대한전기학회 1998년도 하계학술대회 논문집 D
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    • pp.1370-1372
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    • 1998

  • Boron doped CdS films were prepared by CBD(Chemical Bath Deposition) method using boric acid ($B_3HO_3$) as donor dopant source, and their properties were investigated. As-grown CdS films were highly adherent and specularly reflective. Boron doped CdS film which was fabricated under the condition of 0.01 $B_3HO_3/Cd(Ac)_2$ mole ratio, exhibited the lowest resistivity of $2{\Omega}cm$ and the highest optical bandgap of 2.41eV. Also, CdS/CdTe solar cells were fabricated with various doping concentration of CdS films. Using optimized CdS film as the window layer of CdS/CdTe solar cell, the characteristics of the cell were improved. ( $V_{oc}$=610mV, $J_{sc}$=37.5mA/cm, FF=0.4, $\eta$=9.1% )

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Electrochemical Characteristics of H Adsorption Sites at the Poly-Pt/LiOH Aqueous Electrolyte Interface (다결정 Pt/LiOH 수성 전해질 계면에서 수소 흡착부위의 전기화학적 특성)

  • Chun Jang Ho;Cho Chong Dug
    • Journal of the Korean Electrochemical Society
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    • 제2권4호
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    • pp.213-217
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    • 1999

  • The electrochemical characteristics of two distinct adsorption sites of H at the polycrystalline Pt/0.2 M LiOH aqueous electrolyte interface have been studied using the phase-shift method. At the forward and backward scans, the under-potentially deposited H (WD H) peak occurs on the cyclic voltammogram. The transition region on the phase-shift profile or the Langmuir adsorption isotherm occurs at ca. -0.66 to -0.96 V vs. SCE. At the transition region (ca. -0.66 to -0.96 V vs. SCE), the equilibrium constant (K) for H adsorption transits from 18.5 to $4.0\times10^{-5}$ and vice versa. Similarly, the standard free energy $({\Delta}G_{ads})$ of H adsorption transits from -7.2 to 25.1kJ/mol and vice versa. The under and over-potentially deposited H (UPD H and OPD H) on the poly-Pt surface act as two distinguishable electroadsorbed H species. An exothermic reaction occurs at the UPD H range. Both the UPD H peak and the transition region are attributed to the two distinct adsorption sites of the UPD H and OPD H on the poly-Pt surface.

  • https://doi.org/10.5229/JKES.1999.2.4.213 인용 PDF

Synthesis of (N-docosyl pyridinium)-TCNQ (1:1) Complex and Negative Resistance Phenomena in Langmuir-Blodgett Ultra Thin Films ((N-docosyl pyridinium)-TCNQ(1:1) 착체의 합성과 Langmuir-Blodgett 초박막에서 부성저항현상)

  • Seo, T.S.;Choi, M.K.;Lee, W.J.;Shon, B.C.;Kwon, Y.S.;Kang, D.Y.
    • Proceedings of the KIEE Conference
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    • 대한전기학회 1989년도 추계학술대회 논문집 학회본부
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    • pp.105-108
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    • 1989

  • For the purpose of fabricating of LB Ultra Thin Films. (N-docosyl pyridinium)-TCNQ(l: 1) Complex is synthesized. This specimen is verified by U.V. I.R and elemental analyzer. In fabricated LB films with this, as a measurements of electrical conduction characteristics in perpendicular direction, this films have characteristics of insulator(about $10^{-14}S/cm$). And negative resistance phenomena are observed in I-V characteristics of this films.

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