• 조명전기설비학회논문지
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• 제17권3호
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• pp.119-126
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• 2003

공항과 같이 간선이 길게 포설될 수 있는 장소의 저압간선 굵기는 해당 케이블의 허용전류와 전력계통의 전압강하를 고려하며 결정된다. 비록 도체의 허용전류 값이 부하의 허용전류 값에 비하여 여유가 있을지라도 계통의 허용전압강하를 고려할 경우 도체의 굵기는 비교적 크게 산정될 수 있다. 이러한 경우에, 도체의 허용전류 값은 부하의 최대전류 값보다 훨씬 크게 산정될 수 있으며 상대적으로 도체에서 발생되는 열은 감소하게 된다. 도체의 최대 허용온도에 보정된 도체의 교류저항 값이 저압간선의 굵기 산정을 위한 전압강하 계산공식에 적용되어 왔으며, 도체의 저항 값은 도체의 실제 온도상승 값이 적용된 저항 값에 비하여 크다 본 연구는 도체의 실제 온도상승 값이 보정된 도체의 저항 값을 적용하여 저압간선 굵기 선정 설계 실무에 적용할 수 있도록 일반적인 계산 방식에 비하여 오차가 적은 경제적인 설계 방식을 연구하였다.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2002년도 학술대회논문집
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• pp.349-354
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• 2002

A size of low-voltage conductor cables is determined by the voltage drop of a system, the cable impedance and the cable ampacity based on temperature correction factor in accordance with the condition of cable installation. Therefore, the proper temperature correction factor according to the condition of cable installation should be applied to determining the cable ampacity and also the skin effect and proximity effect, along with the kind and size of conductor and the condition of cable installation, should be properly considered to analyze the proper value of resistance and the reactance of the conductors. This paper addresses the systematic design flow for determining the size of low voltage level conductor cables in calculating the temperature character where error should be minimized in comparison with the general formula and which can be applied in design work for determining the size of conductor cables.

• 조명전기설비학회논문지
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• 제16권3호
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• pp.84-92
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• 2002

저압간선의 굵기는 계통의 전압강하, 간선의 포설조건별 온도 보정계수를 적용한 허용 전류 및 간션의 임피 던스 값에 따라 결정된다. 따라서, 간선의 허용전류 값올 결정하기 위하여 간선의 포셜조건에 따른 적정 보정계 수가 적용되어야 하며, 저압간선의 정확한 임피던스 값을 분석하기 위하여 간선의 종류, 간선의 규격, 포셜조건 에 따른 온도, 표피효과 및 근접 효과 둥이 고려되어야 한다. 본 연구는 저압계통의 전압강하를 고려한 간선의 굵기 산정에 대한 체계적인 설계 흐름도를 제시 하였으며, 일반적인 계산 방식에 비하여 오차가 적은 계수로서 저압간선 굵기 선정 설계 실무에 적용할 수 있는 계산 방식을 연구하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
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• pp.396-398
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• 2005

IEC 60287-3-2 standards suggests the selection method of economic conductor size for power cables. This method deals solely with the economic choice of conductor size based on joule losses. This paper introduces the method and example study which is proposed by IEC standards.

• 한국초전도저온공학회:학술대회논문집
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• 한국초전도저온공학회 2003년도 학술대회 논문집
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• pp.206-209
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• 2003

AC loss is an important issue in the design of high-T$_{c}$ superconducting power cables which consist of a number of Bi-2223 tapes wound on a former. In the cables, the tapes have different critical currents intrinsically. And they are electrically connected to each other and current leads. These make loss measurements considerably complex, especially for short samples of laboratory size. So special cautions are required in the positioning of voltage leads for measuring the true loss voltage. In this work we have prepared a conductor composed of three Bi-2223 tapes with different critical currents. The ac loss characteristics in the conductor have experimentally investigated. The loss tests indicate that the ac loss is dependent on arrangements of voltage leads but not on their contact positions. The measured losses in the conductor also agree well with the sum of the transport losses measured in each Bi-2223 tape.e.

• 한국초전도저온공학회:학술대회논문집
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• 한국초전도저온공학회 2003년도 학술대회 논문집
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• pp.7-10
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• 2003

AC loss is an important issue in the design of high-T$_{c}$ superconducting power cables which consist of a number of Bi-2223 tapes wound on a former. In the cables, the tapes have different critical currents intrinsically. And they are electrically connected to each other and current leads. These make loss measurements considerably complex, especially for short samples of laboratory size. So special cautions are required in the positioning of voltage leads for measuring the true loss voltage. In this work we have prepared a conductor composed of three Bi-2223 tapes with different critical currents. The ac loss characteristics in the conductor have experimentally investigated. The loss tests indicate that the ac loss is dependent on arrangements of voltage leads but not on their contact positions. The measured losses in the conductor also agree well with the sum of the transport losses measured in each Bi-2223 tape.e.

• 한국전기전자재료학회논문지
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• 제16권5호
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• pp.418-423
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• 2003

AC loss is an important issue in the design of high-T$\sub$c/ superconducting power cables which consist of a number of Bi-2223 tapes wound on a former. In the cables, the tapes have different critical currents intrinsically. And they are electrically connected to each other and current leads. These make loss measurements considerably complex, especially for short samples of laboratory size. So special cautions are required in the positioning of voltage leads for measuring the true loss voltage. In this work we have prepared a conductor composed of three Bi-2223 tapes with different critical currents. The critical current and AC loss characteristics in the conductor have experimentally investigated. The results show that for uniform current distributions the conductor's critical current is proportional to the critical current of the Bi-2223 tape to which a voltage lead is attached. However it depends on the current non-uniformity parameter in the conductor rather than the tape's critical currents for nonuniform current distributions. The loss tests indicate that the AC loss is dependent on arrangements of voltage leads but not on their contact positions. The measured losses in the conductor also agree well with the sum of the transport losses measured in each Bi-2223 tape.

• 한국초전도ㆍ저온공학회논문지
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• 제7권1호
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• pp.47-50
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• 2005

The AC loss is an important issue in the design of the high temperature superconductor (HTS) power cables, which consist of a number of lli 2223 tapes wound on a former. In the cables, the tapes have different critical currents intrinsically. And they are electrically connected to each other and current leads. These make loss measurements considerably complex, especially for short samples of laboratory size. In this work we have prepared a multi-tape conductor composed of Bi-2223 tapes. The at losses of the conductor have experimentally investigated. The loss tests indicate that the effect of tapes critical currents on AC loss measurement in the multi tape conductor is negligible only if currents in the tapes flow uniformly Moreover, the measured tosses of the conductor are in good agreement with the sum of the transport losses in the tapes. However, in the case of non-uniform current distributions, the measured AC losses considerably depend on the current distribution parameter of the positioning of a voltage lead. Thus special cautions should be needed for the measurement of the true AC losses in the short power cable samples.

• 전기학회논문지
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• 제58권9호
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• pp.1689-1694
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• 2009

In a previous paper, the characteristics of ECC (earth continuity conductor) have been analysed for reducing the level of induced sheath voltage considering the dimension and position of ECC, the spacing between ECC and three phase cables, and the use of two ECC conductors at the single point boned section of underground power cable system. From these results, the study conditions for optimal installation has been selected such as installation section, conductor size and etc. In this paper, 5 cases which are set by possible installation conditions are tested based on previous research results. Finally, the optimal installation method of ECC is selected on underground power cable systems.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1991년도 하계학술대회 논문집
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• pp.274-276
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• 1991

Since the successful development of 154kV XLPE cable in 1983, its commercial use has been drastically expanded due to technical advantages and high performance of insulation, Futhermore, the large conductor size of 1200ml and 2000ml has been mainly employed in Korea for the purpose of meeting the bulk power demand in urban area. However, it is highly required to solve the problems which can be occured at the level of the joints between the cables of different type such as between existing OF and XLPE cables.