• Title/Summary/Keyword: Breakdown strength

Search Result 522, Processing Time 0.029 seconds

The Effects of Interfacial on the Electrical Properties in PET Films (PET 필름의 전기적 특성에 미치는 계면효과)

  • Gang, Mu-Seong;Lee, Chang-Hun;Park, Su-Gil;Park, Dae-Hui
    • The Transactions of the Korean Institute of Electrical Engineers C
    • /
    • v.48 no.5
    • /
    • pp.281-284
    • /
    • 1999
  • In this paper, the electrical conduction, breakdown strength and dielectric properties were investigated in the interfaces of PET films. The volume resistivity and breakdown strength were decreased; especially the specimens with semiconductive layer showed the lowest breakdown strength. This decrease of electrical properties was appeared by increasing charge density in inhomogeneous layer of PET. The dielectric properties of PET did not show significant difference with PET/PET but the films with semiconductive interface layer showed the increase in capacitance and $tan\delta$ was affected by the PET rather than semiconductive layer. It is assumed that the variation of $tan\delta$ was affected by the dielectric polarization and the leakage current(charge).

  • PDF

A Study on the Property of the Breakdown Strength and the Electrical Conduction of the PET Flim being Interface (계면이 존재하는 PET flim의 절연파괴와 전기전도특성에 관한 연구)

  • Kang, Moo-Sung;O, Jae-Hyung;Park, Dae-Hee;Han, Sang-Ok
    • Proceedings of the KIEE Conference
    • /
    • 1996.11a
    • /
    • pp.221-223
    • /
    • 1996
  • The test on the breakdown strength and the electrical conduction property about the PET flim have been done when the interface exist and do not exist between the PET flim. The PET flim that does not exist the interface uniformly maintained the breakdown strength as the temperature increase. But, the breakdown strength of the PET flim inserted carbon black flim decreased as the temperature increase. The initial current of the PET flim inserted carbon black flim was higher than the PET flim and the uniformly distributed between 2.2E-9 and 2.5E-9 above 5kV/mm.

  • PDF

A Study on the AC Interfacial Breakdown Properities of the Interface between Epoxy/EPDM with the variation of spreaded oil (도포된 오일의 변화에 따른 Epoxy/EPDM 계면의 교류 절연 파괴 특성에 관한 연구)

  • Bae, Duck-Kweon;Lee, Su-Kil;Jung, Il-Hyung;Lee, Jun-Eung
    • Proceedings of the KIEE Conference
    • /
    • 1999.11d
    • /
    • pp.897-899
    • /
    • 1999
  • In this paper, the interfacial dielectric breakdown phenomenon of interface between Epoxy/EPDM (ethylene propylene diene terpolymer) was discussed, which affects stability of insulation system of power delivery devices. Specimen structure was designed by using MAGSOFT's FLUX2D based on the finite elements method. Design concepts is to reduce the effect of charge transport from electrode in the process of breakdown and to have the tangential electrical potential with the Epoxy/EPDM interface. AC interfacial breakdown phenomenon of was investigated by variation of interfacial conditions oil and temperature which are supposed to have influence on the interfacial breakdown strength. Interfacial breakdown strength was improved by spreading oil over interfacial surface. The decreasing ratio of the AC interfacial breakdown strength in non-oiled specimens was increased by the temperature rising and its of oiled specimens was not affected by temperature.

  • PDF

Effect of pore size and porosity on electrical breakdown behaviors of $BaTiO_3$ ceramics ($BaTiO_3$ 세라믹의 절연파괴거동에 미치는 기공의 크기와 기공율의 영향)

  • 조경호;우동찬;남효덕;이희영
    • Electrical & Electronic Materials
    • /
    • v.10 no.3
    • /
    • pp.255-261
    • /
    • 1997
  • In this study, pore-containing barium titanate ceramics were prepared with different porosities and pore sizes, in order to better understand how porosity and pore size affect electrical breakdown of barium titanate ceramics. A granulated barium titanate powder was mixed with three grades of commercial polymer microspheres up to 11wt%. The electrical breakdown test was performed at two different temperatures of 30.deg. C(below Tc) and 150.deg. C(above Tc) for samples immersed in a silicon oil bath using a 60kV de power supply. Electrical breakdown strength of pore containing barium titanate ceramics with porosity lower than 10% decreased as pore size and porosity increased. However, above the 10% porosity region, electrical breakdown strength decreased as the pore connectivity increased. From the experimental results, an optimum electrical breakdown model is proposed in an attempt to explain the effect of pores.

  • PDF

A study on the v-t characteristics of interfaces between Toughened Epoxy and Rubber with Inverse Power Law (역승법칙을 이용한 터픈드 Epoxy/Rubber 계면의 V-t 특성에 관한 연구)

  • 박정규;이동규;오현석;신철기;박건호;박우현;이기식;이준웅
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2000.11a
    • /
    • pp.437-440
    • /
    • 2000
  • In this study, the interfacial dielectric breakdown phenomenon of interface between Epoxy and Rubber was discussed, which affects the stability of insulation system of power delivery devices. The breakdown strength of specimens are observed by applying high AC voltage at the room temperature. The breakdown times under the constant voltage below the breakdown voltage were gained. As constant voltage is applied, the breakdown time is proportion to the breakdown strength. The life exponent n is gained by inverse power law and the long time breakdown life time can be evaluated.

  • PDF

Adhesion properties and Breakdown behaviors of LSR Interface (LSR 계면의 접착특성 및 절연파괴거동)

  • Yoon, Seung-Hoon;Nam, Jin-Ho;Lee, Gun-Ju;Choi, Soo-Geol;Shin, Doo-Sung;Ji, Eung-Seo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2002.11a
    • /
    • pp.232-235
    • /
    • 2002
  • Recently developed liquid silicone rubber (LSR) can be cured by platinum catalyzed additional hydrosilylation mechanism and has the advantage of no byproduct compared to traditional millable peroxide curing silicone rubber. We investigated the characteristics of dielectric breakdown of silicone rubber and adhesion properties between semi-conductive LSR and insulating LSR for high voltage application of pre-molded joint (PMJ). In order to understand the dielectric breakdown characteristics, we used the sheet samples and the paired type rogowski insert electrode system. The breakdown strength and adhesion strength of LSR (E-3) were superior to those of several silicone rubbers. Adhesion strength could be improved by curing at high temperature without post-curing process or enhanced by post-curing process. When LSR (E-3) was cured at $(150^{\circ}C{\times}10min$ semi-conductive )${\times}$ ($175^{\circ}C{\times}10min$ insulation), it showed the high breakdown strength with low standard deviation, and good adhesion strength. In this results, we could apply this process to the fabrication of PMJ without post-curing.

  • PDF

Electrical Breakdown Properties of Insulating Oils for oil-immersed transformer (유입변압기용 절연유의 절연파괴특성)

  • Lee, I.S.;Shin, H.T.;Lee, J.P.;Lee, S.W.;Hong, J.W.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2001.11b
    • /
    • pp.605-608
    • /
    • 2001
  • With the intention of investigating the breakdown properties of oil-immersed transformer oils in temperature range of $20\sim100[^{\circ}C]$, we are made researches AC breakdown in the gap of $500\sim2500[{\mu}m]$. The classification for the physical properties of oil for oil-immersed transformer by FTIR and H-NMR experiments was confirmed to type of mineral oils. As the dependance of breakdown properties due to electrode gap length variation, breakdown voltage was found increasing according to the increase of gap, while dielectric strength was decreasing. As a result the characteristics for AC breakdown, It goes to prove that the breakdown voltage was increased to $90[^{\circ}C]$ but decreased over $90[^{\circ}C]$ in the temperature range. Also, breakdown voltage was found increasing in the increase of gap and the rising of temperature according to Weibull distribution.

  • PDF

Study on Electrical and Mechanical Properties of High Viscosity Solid Epoxy / Silica and Alumina Composite (고점도형 고상에폭시/실리카와 알루미나 콤포지트의 전기적, 기계적 특성연구)

  • Park, Jae-Jun
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.67 no.10
    • /
    • pp.1330-1337
    • /
    • 2018
  • In this study, 40, 50, 60, and 70 wt% filler dispersed samples were prepared for the current GIS Spacer or environmentally friendly GIS. In the AC electrical breakdown, EMSC and EMAC decreased with increasing filler content, and EMSC showed better breakdown strength than EMAC. The mechanical properties such as tensile strength and flexural strength of EMSC and EMAC were also increased with increasing filler content. In addition, EMSC results in better mechanical properties than EMAC. The reason for this is considered to be one in which the influence of the interface is important.

A Study on the AC Interfacial Breakdown Properties of the Interface between Epoxy/EPDM with Variation of the Spread Oil (도포된 오일의 변화에 따른 Epoxy/EPDM 계면의 교류 절연파괴 특성에 관한 연구)

  • Bae, Deok-Gwon;Jeong, Il-Hyeong;O, Jae-Han;Park, U-Hyeon;Lee, Gi-Sik;Kim, Chung-Hyeok;Lee, Jun-Ung
    • The Transactions of the Korean Institute of Electrical Engineers C
    • /
    • v.49 no.8
    • /
    • pp.445-450
    • /
    • 2000
  • Many successful developments and microscopic studies have been made on the high quality insulating materials. However, a little attention have given to the macroscopic interface in HV(High Voltage) insulating systems. In this study, AC interfacial breakdown strength and V-t characteristic of the interface between Epoxy/EPDM(ethylene propylene diene terpolymer) are investigated. Electrode system is designed to reduce the charges from electrodes and to have the tangential potentials along the interface between Epoxy/EPDM by FEM(finite elements method). The AC breakdown strength is observed when HV is given to the interface. It is shown that AC interfacial breakdown strength is improved by increasing interfacial pressure and oiling. In particular, it was saturated at certain interfacial pressure level. V-t characteristic is able to extend to the life time of the interface between Epoxy/EPDM. Oiling also plays a good roll in prolongation of the life time.

  • PDF

Experimental Research on Impulse Breakdown Characteristics of Soil

  • Lee, Jaebok;Sughun Chang;Sungho Myung;Yuengue Cho
    • KIEE International Transactions on Electrophysics and Applications
    • /
    • v.4C no.2
    • /
    • pp.60-63
    • /
    • 2004
  • The electrical breakdown characteristics of different types of soil samples have been measured. It is shown that the threshold soil breakdown strength is affected by many factors, such as types of soil, grain size, and soil compaction. The breakdown process in the test soil samples appears to be due to air ionization in the voids between the soil particles. The results have been compared with the relevant experimental results of other researchers.