• Title/Summary/Keyword: crosslinked polyethylene(XLPE)

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A Study on Electric Properties and Accelerated Water Tree Degradation of Environmental-friendly Non-crosslinked Polyethylene (친환경 비가교 폴리에틸렌의 전기적 특성과 워터트리 가속열화에 관한 연구)

  • Lee, June-Ho;Kong, Tae-Sik;Kim, Seong-Jung;Kwon, Ki-Hyung;Lee, Jae-Soon;Gu, Gwang-Hoe;Cho, Kyu-Cheol
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.6
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    • pp.827-832
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    • 2012
  • The crosslinked polyethylene (XLPE) is the most widely used insulating material for power cable. Due to its thermosetting characteristics, the XLPE can not be recycled, while the needs for the environmental friendly and recyclable insulator is rapidly increasing. In this paper, some important and basic electrical properties of non-crosslinked polyethylene such as conduction current characteristics, water the tree characteristics, AC breakdown test were experimentally investigated. It was shown that some of the tested samples had better performances from the application point of view for replacing current XLPE.

Interfacial charge Behaviors in XLPE/SXLPE Laminates (XLPE/SXLPE laminate의 계면전하 거동)

  • 고정우;남진호;서광석
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.07a
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    • pp.897-900
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    • 2001
  • Space charge distributions in silane crosslinked polyethylene (SXLPE)/ crosslinked polyethylene (XLPE) laminates was investigated using a pulsed electroacoustic (PEA) method. XLPE shows heterocharge while SXLPE shows homocharge. Positive charge is accumulated at the interface of SXLPE/XLPE laminate when applied electric field is more than 20 kV/mm. The charge profile at various temperatures was also acquired using temperature-controllable PEA system. Although applied electric field is only 8.6 kV/mm, positive interfacial charge starts to appear near 50$^{\circ}C$.

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Water tree growing and Electrical breakdown Characteristics of XLPE/SXLPE blends (XLPE/SXLPE 블렌드의 수트리 성장 및 절연파괴 특성)

  • 고정우;서광석
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1999.11a
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    • pp.55-58
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    • 1999
  • Crosslinked polyethylene/silane crosslinked polyethylene (XLPE/SXLPE) blends were prepared by a twin screw extruder and their water tree growing and electrical breakdown characteristics of XLPE were improved by the addition of SXLPE, when samples were crosslinked only by the thermorolysis of DCP (dicumyl perosxide). However, steam curing process was not good for water tree characteristics. It was also found that the rate of water tree growing of XLPE/SXLPE blend increased when the content of SXLPE was 50 %. AC breadown strength slightly increased by the addition of SXLPE to XLPE when samples were crosslinked only by the thermorolysis of DCP.

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Electrical Properties of XLPE/VLDPE B1ends (XLPE/VLDPE 블렌드의 전기적 성질)

  • 고정우;서광석;김종은;강형식;김덕주
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1998.06a
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    • pp.215-218
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    • 1998
  • XLPE/VLDPE (Crosslinked polyethylene/very low density polyethylene) blends were prepared by a twin screw extruder and their electrical properties such as water tree and breakdown characteristic were measured. it was found that both water tree and breakdown characteristics of XLPE were improved by the addition of VLDPE to polyethylene. It was also found that the extent of improvement of electrical properties by the addition of VLDPE to polyethylene depends on the type and concentration of VLDPE.

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Water Tree Growing and Electrical breakdown Characteristics of XLPE/XLPE blends (XLPE/SXLPE 블랜드의 수트리 성장 및 절연파괴 특성)

  • 고정우;서광석
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.13 no.5
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    • pp.420-425
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    • 2000
  • Crosslinked polyethlyene/silane crosslinked polyethylene(XLPE/SXLPE) blends were prepared by a twin screw extruder and their water tree growing electrical breakdown and crossinking characteristics were investigated. The water tree characteristics of XLPE were improved by the addition of SXLPE when samples were crosslinked only by the thermorolysis of DCP (dicumyl peroxide). However steam curing process was not good for water tree characteristics. It was also found that the rate of water tree growing of XLPE/SXLPE blend increased when the content of SXLPE was 50%. AC breadown strength slightly increaed by the addition of SXLPE to XLPE when samples were crosslinked only by the thermorolysis of DCP. It was also found that the degree of crosslinking of XLPE/SXLPE blends were higher than that of XLPE in the case of the content without steam crosslinking process.

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Interfacial Charge Behaviors in SXLPE/XLPE Laminates (SXLPE/XLPE laminate의 계면전하 거동)

  • 고정우;남진호;서광석
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.15 no.2
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    • pp.127-132
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    • 2002
  • Space charge distributions and behaviors in silane crosslinked polyethylene(SXLPE)/ crosslinked polyethylene(XLPE) laminates were investigated using a pulsed electroacoustic (PEA) method. In case of monolayer, XLPE shows heterocharge while SXLPE shows homocharge. It was observed that charges were accumulated at the interface of SXLPE/XLPE laminate when applied electric field was more than 20kV/mm. The charge profile at various temperatures was also acquired using temperature-controllable PEA system. Although applied electric field is only 8.6 kV.mm, positive interfacial charge starts to appear near 50$^{\circ}C$. It was found that the interfacial charge behavior of SXLPE/XLPE laminate under low voltage at high temperature is corresponding to that under high voltage at room temperature.

Electrical Properties and Crosslinking Characteristics of XLPE/SXLPE Blends (XLPE/SXLPE 블렌드의 전기적 성질 및 가교 특성)

  • Ko, Jung-Woo;Ha, Nam-Kyu;Suh, Kwang-S.
    • Proceedings of the KIEE Conference
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    • 1999.07d
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    • pp.1602-1604
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    • 1999
  • Crosslinked polyethylene/silane crosslinked polyethylene (XLPE/SXLPE) blends were prepared by a twin screw extruder and their water tree and crosslinking characteristics were investigated. The water tree characteristics of XLPE were improved by the addition of SXLPE, when samples were cross- linked only by the thermorolysis of DCP (dicumyl peroxide). However, steam curing process was not good for water tree characteristics. It was also found that the degree of crosslinking of XLPE/SXLPE blends were higher than that of XLPE.

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Electrical properties of XLPE/SXLPE blends as a function of silane coupling agent contents (실란 계면 결합제 함량에 따른 XLPE/SXLPE 블렌드의 전기적 성질)

  • Ko, Jung-Woo;Suh, Kwang-S.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2000.05a
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    • pp.33-36
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    • 2000
  • Electrical properties of Crosslinked polyethylene/silane crosslinked polyethylene (XLPE/SXLPE) blends were studied. Silane coupling agents of various contents were added to blends and their water tree and electrical breakdown characteristics were investigated. The water tree length of XLPE/SXLPE were increased by the addition of silane coupling agents except the case of SXLPE 10 % containing coupling agents of 0.5, 1.0 phr. AC breadown strength slightly increased by the addition of coupling agents to XLPE/SXLPE blends in cases of SXLPE 20 % containing coupling agents of 2.0 phr and SXLPE 50 %. The tendency of effects on water tree and breakdown characteristics was inverse.

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The Improvement of Radiation Characteristics of Low Density Polyethylene by Addition of Treeing Inhibitors (트리 억제제 첨가에 의한 저밀도 폴리에틸렌의 내방사선성 향상)

  • Kim, Ki-Yup;Lee, Chung;Ryu, Boo-Hyung;Lim, Kee-Joe
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.49 no.8
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    • pp.455-461
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    • 2000
  • The inhibiting effects of electrical treeing and insulation properties of LDPE contained with treeing inhibitors was studied under radiation environment. Barbituric acid and its derivatives were selected as treeing inhibitors. The inception voltage and growth of tree, AC breakdown strength, volume resistivity, high frequency capacitance, and dissipation factor were observed as a function of dose(up to 1000 kGy). And also, measurements of thermo-luminescence(TL), and gel content were carried out. Crosslinked low density polyethylene(XLPE) contained with treeing inhibitors shows better insulation characteristics such as electrical tree propagation, AC breakdown strength, and volume resistivity than those of pure LDPE. The most effective treeing inhibitor was found on the barbituric acid contained XLPE.

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Evaluation of Radiation Degradation or Crosslinked Polyethylene using TGA (TGA를 이용한 가교폴리에틸렌의 방사선 열화 평가)

  • Lee, Chung;Kim, Ki-Yup;Ryu, Boo-Hyung;Lim, Kee-Joe
    • Journal of the Korean Society of Safety
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    • v.18 no.2
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    • pp.50-55
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    • 2003
  • Radiation degradation of crosslinked polyethylene(XLPE) was investigated using thermogravimetric analysis(TGA), The results of TGA were compared with FT-IR, melting temperature, oxidation induction time, and elongation at break on the XLPE exposed by $\gamma$-ray. 5% decomposition temperature of $\gamma$-ray irradiated XLPE showed similar tendencies with the case of elongation at break. Both properties agreed below 1000 KGy, however, did not show any remarkable characteristics above 1000 kGy, these properties can be useful to evaluate the radiation degradation of XLPE for only low irradiated region. Above 1000 kGy, the thermal decomposition activation energy showed decreased, on the contrary, increasing below 1000 kGy. Compared with FT-IR spectrum of irradiated XLPE, it was confirmed that the oxidation reaction was still occurring below 1000 kGy. Radiation degradation of XLPE was dependent upon the irradiation doses, TGA can be a useful tool to evaluate the degradation.