• 한국초전도ㆍ저온공학회논문지
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• 제12권3호
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• pp.21-24
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• 2010

A cryogenic insulation technique for a high voltage and a large current capacity of a conductor are now two big issues in a field of recent R&D projects of superconducting power devices, especially a superconducting power transformer. For the large rated currents of the power transformer, it is well known that lots of 2nd generation superconducting conductor, so called coated conductor, should be stacked together with transpositions in order to get an even distributions of the currents. We had come up with an idea of a CTCC (Continuously Transposed Coated Conductor) as a conductor for a large power superconducting transformer, and keep trying to verify the usefulness of the conductor. As one of the efforts of verifying, we prepared and tested a sample CTCC with insulations for high voltage, which includes the epoxy coating and Nomex$^{(R)}$ wrapping. This paper contains the insulation process and dielectric breakdown test results. We expect the results obtained from this experiment to improve an insulation technique for high voltages in various cryogenic environments[1,2].

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.386-387
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• 2007

우리나라 난연성 작업복의 역사는 매우 짧다. 외국의 선진 사례에 비교하여 전기아크에 대한 보호구 기준 및 제도가 미비한 현실에서 한전이 국내 최초로 난연성 작업복을 전직원에게 도입하면서 난연성 작업복의 중요도와 개인 안전에 대한 인식이 새롭게 자리매기고 있다. 한전 난연성 작업복의 현주소는 한국을 대표할 뿐만 아니라 세계적 수준에 도달하였으나, 몇 가지 풀어야 할 과제를 안고 있다. 디자인을 좀 더 발전시켜 시대적 흐름에 부합하는 좀더 기능적이고도 세련된 작업복의 구현이 그것이다. 이를 위한 원단 및 디자인 개발을 위한 다양한 시도는 앞으로도 꾸준히 계속될 것이다.

• 비파괴검사학회지
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• 제37권2호
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• pp.91-98
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• 2017

Recently, composite materials have been mainly used in the main wings, ailerons, and fuselages of aircraft and rotor blades of helicopters. Composite materials used in rapid moving structures are subject to impact by hail, lightning, and bird strike. Such an impact can destroy fiber tissues in the composite materials as well as deform the composite materials, resulting in various problems such as weakened rigidity of the composite structure and penetration of water into tiny cracks. In this study, experiments were conducted using a 2 kW halogen lamp which is most frequently used as a light source, a 2 kW near-infrared lamp, which is used for heating to a high temperature, and a 6 kW xenon flash lamp which emits a large amount of energy for a moment. CFRP composite sandwich panels using Nomex honeycomb core were used as the specimens. Experiments were carried out under impact damages of 1, 4 and 8 J. It was found that the detection of defects was fast when the xenon flash lamp was used. The detection of damaged regions was excellent when the halogen lamp was used. Furthermore, the near-infrared lamp is an effective technology for showing the surface of a test object.