• Title/Summary/Keyword: EPR(Ethylene propylene rubber)

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A Study on Properties of Charge & Discharge Current by Degrade in EPR (EPR의 열화에 의한 충.방전 전류 특성에 관한 연구)

  • Lee, Sung-Ill
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.21 no.7
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    • pp.679-685
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    • 2008
  • This paper describes the degraded properties of between the charge and discharge current for ${\gamma}$-ray irradiated in electric power cable rubbers using in nuclear power generating station. The charge and discharge current of degradation in EPR(Ethylene Propylene Rubber), which were irradiated with the radiant capacity of 0.033 Mrad/h, have been measured in order to investigate the influence of the atmosphere(in amount of reinforcing agent, moisture absorption and heat treatment) on electrical properties. When ${\gamma}$-ray were irradiated on the EPR with more reinforcing agent from 4 to 40 Phr, charge and discharge currents was increase due to the amount of reinforcing agent. It was verified that the discharging and charging currents irradiated by ${\gamma}$-ray were higher than those that was not irradiated. The amount of the degraded current was more after moisture absorption than before moisture absorption. The charge and discharge current after heat treatment was similar to that of before heat treatment and it was decreased with the time elapsed. As these properties related with ${\gamma}$-ray irradiation dose, it is suggested that these properties can be utilized as a index of irradiation degradation.

A Study on Thermally Stimulated Current Properties of EPR due to filler Dependence (충.진제 변화에 의한 EPR의 열자격전류 특성에 관한 연구)

  • 이성일;박일규
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.132-135
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    • 2000
  • This paper present the results of measured Thermally Stimulated Current of EPR(Ethylene Propylene Rubber) sheet material with variation of bias temperature range of -35~80[$^{\circ}C$], the quality of the material of electrode, condition. The origins of these peaks are that, low temperature peak seems to result from dipole, and high temperature peak from the orientation electronic trap.

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전략케이블에 쓰이는 절연재료의 변천과 발달과정

  • 구자윤
    • 전기의세계
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    • v.34 no.8
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    • pp.476-488
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    • 1985
  • 전기공학분야의 여러다른 부분과 같이 전력케이블 분야에서도 수많은 연구와 아울러 특히 19세기후반에 전력케이블의 제작에 성공한 것은 20세기에 들어와서 케이블과 이에 관련된 모든 기술이 빠른 속도로 발달하게된 주원동력이 되었다고 보아도 과언은 아니다. 비록 19세기 후반에 고무(rubber)를 사용하여 케이블 절연 하였지만, 그이후 약 70여년이상을 Impergnated paper(오일복합수지(oil compound resin)나 오일(oil)을 종이에 스며들게한 후 그 종이를 절연재료로 이용함)를 전력케이블 절연재료로 많이 사용하여 왔다. 아울러 OF cable의 제조기술도 향상되어 현재 매우 높은 전압과 상당한 전력용량를 충족시키는 전력케이블로서 발달을 계속하고 있다. 1960년대에 들어서서 extruded polymer material 이 전력케이블의 절연재료로 쓰이게 되었는데 현저하게 주로 쓰이는 재료로 폴리에틸렌인대, 그대로 순수한 상태로 또는 어떤 처리를 하여 쓰기도 한다. 그러나 EPR(ethylene propylene rubber)도 역시 개발중에 있다. Extruded synthetic insulation을 사용한 케이블은 현재 모든 필요한 전류와 전압을 망라하여 널리 쓰이고 있으며 다른재료를 사용한 케이블 보다 설치하기에 쉽고 사용법이 비교적 간단하고, 또한 전력망(network)에서의 신뢰서이도 높은 것으로 나타나 매우 만족스런 재료로 인정받고 있다.

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A Study of the Irradiation Environment Effects on the Electrical Properties of Ethylene Propylene Rubber (방사선 조사 환경에 의한 에칠렌 프로필렌 고무의 전기 특성에 관한 연구)

  • 이성일
    • Journal of the Korea Safety Management & Science
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    • v.2 no.2
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    • pp.187-200
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    • 2000
  • The charge and discharge current in EPR(Ethylene Propylene Rubber), which were irradiated with the radiant capacity of 0~600 [kgy/h], have been measured in order to investigate the influence of the atmosphere (oxygen, air and vacuum) on electrical properties. It has been shown that the charge and discharge current increase as the amount of radiant capacity increases in air and vacuum atmosphere. This electrical property degradation can be speculated due to that the C=O radicals or impurities, which comes from during shaping process, may act as dipoles. On the other hand, the charge and discharge current are shown to be higher in the amount of 1[kgy/h] than these in 10[kgy/h] in air atmosphere, because the charge and discharge current can be increased as the exposure time is extended with slower rate. Under the same amount of irradiation, the charge and discharge current in oxygen atmosphere are shown to be higher than those in vacuum. This is possibly due to that the main chain can be broken by oxidation when it is exposed to the $\gamma$ -rays.

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Mechanical Properties and Statistical Evaluation of EPR According to the Accelerated Degradation (EPR의 가속 열화에 의한 기계적 특성 및 통계적 평가)

  • Kim, Ji-Yeon;Yang, Jong-Suk;Lee, Gil-Soo;Seong, Baek-Yong;Bang, Jeong-Hwan;Park, Dae-Hee
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.28 no.8
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    • pp.501-507
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    • 2015
  • In this paper, EPR (ethylene propylene rubber) insulation material was accelerated degradation test at $121^{\circ}C$, $136^{\circ}C$, $151^{\circ}C$, and experiment the typical EAB (elongation at break) at mechanical characteristics analysis. It is shown that the failure-time at the point of 50% of the initial value of Elongation rate to obtain the activation energy. The failure-time was shown each 5,219 hr, 3,165 hr, and 668 hr at three temperatures. In order to derive the activation energy, Arrhenius methodology was applied. Also, we got the Arrhenius plot from three accelerated temperatures. The activation energy values got 0.98 eV from EAB test. The experimental data were evaluated for estimating the probability density, and the suitable distribution by using statistical program MINITAB. It is shown that EAB data by the acceleration thermal degradation is most suitable for the Weibull distribution.