• Title/Summary/Keyword: Choi Wook

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Electrorheology of HMDA Coupled Chitosan Succinate Suspension as an Anhydrous ER Fluid

  • Kong, Seong-Wook;Kim, Seung-Wook;Lee, Sang-Soon;Choi, Ung-Su
    • KSTLE International Journal
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    • v.9 no.1_2
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    • pp.7-9
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    • 2008

  • The electrorheology of the HMDA coupled chitosan succinate suspension in silicone oil was investigated. HMDA coupled chitosan succinate suspension showed a typical ER response upon application of an electric field. The shear stress for the HMDA coupled chitosan succinate suspension exhibited an electric field power of 2.0. The experimental results for the HMDA coupled chitosan succinate suspension was found to be an anhydrous ER fluid.

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Electrical Insulation Design of a 154kV-Class HTS Power Cable

  • Choi, Jin-Wook;Kwag, Dong-Soon;Choi, Jae-Hyeong;Kim, Hae-Jong;Cho, Jeon-Wook;Kim, Sang-Hyun
    • Progress in Superconductivity and Cryogenics
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    • v.11 no.2
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    • pp.25-28
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    • 2009

  • A 154kV class high-temperature superconducting (HTS) power cable system is developing in Korea. For insulation design of this cable, it is important that study on cryogenic electrical insulation design to develop the cold dielectric type HTS cable because the cable is operated under the high voltage environment in cryogenic temperature. Therefore, this paper describes a design method for the electrical insulation layer of the cold dielectric type HTS cable adopting the partial discharge-free design under ac stress, based on the experimental results such a ac breakdown strength, partial discharge inception stress, $V_{ac}$-t characteristics, $V_{imp}$-n characteristics, and impulse breakdown strength of liquid nitrogen/laminated polypropylene paper (LPP) composite insulation system in which the mini-model cable is immersed into pressurized liquid nitrogen.

  • https://doi.org/10.9714/psac.2009.11.2.025 인용 PDF KSCI

A Study on Insulation Characteristics by Thickness of Laminated Polypropylene Paper for an HTS Transmission Cable (송전급 HTS 케이블용 반합성지의 두께에 따른 절연특성 연구)

  • Choi, Jin-Wook;Choi, Jae-Hyeong;Kim, Hae-Jong;Cho, Jeon-Wook;Kim, Sang-Hyun
    • Progress in Superconductivity and Cryogenics
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    • v.11 no.1
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    • pp.35-38
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    • 2009

  • The high temperature superconducting(HTS) power cable, as a key component of the next generation power transmission system, operates cost-effectively because of much less transmission loss. Currently, a world-wide research has been undertaken actively. In this research, we designed insulation thickness and investigated thickness effect of laminated polypropylene paper(LPP) which is insulation material of HTS cable in case of AC and impulse breakdown.

  • https://doi.org/10.9714/psac.2009.11.1.035 인용 PDF KSCI