• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 E
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• pp.2126-2129
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• 1999

We have developed the automatic diagnostic system for power cable insulation using DC voltage decay method in this work. Test condition, test method and diagnose criteria of our diagnostic system are adjustable to a class of power cables such as 3.3, 6.6, 11 and 22kV power cables. We have also developed measurement and diagnostic programs for win95 which is suitable for the management of database such as test condition, diagnose results and cable operation data.

• 한국전기전자재료학회논문지
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• 제11권7호
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• pp.502-507
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• 1998

The purpose of this study is to investigate the breakdown properties in joint interface of power cables with heat treatment. The specimens have the structure of XLPE/EPDM interface like the joint of distribution power cable. The breakdown characteristics of the SLPE/EPDM joint were studied with crosslinking by=products. AC breakdown voltages were measured with heat treatment time and interfacial materials and crosslinking by-products as testing factors. This study has shown that crosslinking by-product gases play an important role at the insulation properties of cable joints by heating. The dielectric strength shows the lowest values at 4 hours heat treatment. The AC breakdown strength in the untreated sample was increased with heat treatment time.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제51권2호
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• pp.74-79
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• 2002

We have been analyzed the interference problems already in steady state, especially AC corrosion when the gas pipeline is burred with power cable in the same submarine tunnel. In the next stage, we analyze the induced voltage in a fault condition of 154[kV] underground T/L. This paper presents the results of them which are limitation of safety voltage. meodeling of power cables, gas pipeline and grounding systems, analysis of induced voltage in a fault condition, and protection of Power line system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 B
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• pp.973-975
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• 2003

Uniform current distribution among conductor layers in HTS cables using IPTS (inter-phase transformers) was proposed. Conventional methods for current distribution, in which resistors are inserted to conductor layers, causes additional loss. In contrast, IPTS, which use magnetic coupling, make it possible that the current in parallel circuits is distributed uniformly with any load, and minimize the loss. In this study, IPTS were designed and fabricated for examination of uniform current distribution in the conductor layers of HTS cables. The ITP was designed through calculation of its impedance that can cancel the inductance of the conduction layers.

• 조명전기설비학회논문지
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• 제28권7호
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• pp.91-96
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• 2014

The requirements for separation between ICT cables and power cables depend upon the electromagnetic immunity of the ICT cable, the construction of the power cable, the quantity of, and type of electrical circuits and the presence of dividers etc. We studied and reviewed the regulations and standards relevant for requirements of this separation in domestic and foreign. And then we would like to suggest the method of separation calculation between ICT and power cabling taking the EMC into consideration.

• 한국산업융합학회 논문집
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• 제26권6_1호
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• pp.985-991
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• 2023

This study proposes a solution to the voltage drop in electric vehicle chargers, due to the parasitic resistance and inductance of power cables when the chargers are separated by large distances. A method using multi-level electric vehicle chargers that can output power in stages, without installing an additional energy supply source such as a reactive power compensator or an energy storage system, is proposed. The voltage drop over the power cables, to optimize the charging scheduling, is derived. The obtained voltage drop equation is used to formulate the constraints of the optimization process. To validate the effectiveness of the obtained results, an optimal charging scheduling is performed for each period in a case study based on the assumed charging demands of three connected chargers. From the calculations, the proposed method was found to generate an annual profit of $20,800 for a $12,500 increase in installation costs.

• KEPCO Journal on Electric Power and Energy
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• 제2권2호
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• pp.299-305
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• 2016

초전도 전력 케이블의 상용화 노력에 따라 점차 장선화 되면서, 단위 냉각 시스템당 냉각용량이 큰 대용량 냉동기의 필요성이 증가하고 있다. 국내에서는 극저온 냉동기에 대한 기술 부족으로 인해 현재 극저온 냉동기는 해외 선진사로부터 고가의 비용으로 수입되고 있다. 초전도 전력 케이블의 상용화를 위해서는 대용량 브레이튼 냉동기의 국내 개발이 시급하다. 대용량 브레이튼 냉동기의 구성은 복열식 열교환기, 압축기, 극저온 터보 팽창기로 구성되어 있으며, 냉동기 효율과 가장 직접적인 연관이 있는 것은 극저온 터보 팽창기이다. 극저온 터보 팽창기는 극저온에서 고속으로 회전하면서 고압의 헬륨 혹은 네온 가스를 팽창시켜 온도를 낮추는 역할을 한다. 본 논문에서는 역브레이튼 냉동 사이클을 설계하고, 이에 적합한 극저온 터보 팽창기를 설계하였다.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2004년도 추계학술발표회 발표논문집
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• pp.1345-1346
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• 2004

• 전기저널
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• 통권452호
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• pp.22-28
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• 2014

• 조명전기설비학회논문지
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• 제23권6호
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• pp.104-108
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• 2009

본 논문에서는 지중전력케이블을 대상으로 케이블의 절연열화특성 분석시험을 통해 케이블의 절연열화와 절연 진단결과 및 파괴강도와의 상관관계에 대한 실증연구를 수행하였다. 시험대상 선로의 제조결함 여부를 확인하기 위해 가교도분석, 핫오일테스트 등을 실시한 결과 제조결함은 없는 것으로 확인되었다. 진단대상 선로는 3상 모두 장기간 사용에 의해 열화가 많이 진전되었고, 특히 B상이 수트리 길이 및 화학구조결함 농도 면에서 가장 열화된 케이블인 것으로 판단되며, C상, A상의 순으로 열화정도가 다소 감소함을 확인하였다. 상기 결과는 진단시험 및 파괴 강도시험 결과와 일치하며, 따라서 열화시정수법을 이용한 진단장치가 열화상태가 심각한 케이블의 선별에 효과적인 진단법임을 확인하였다.