• 조명전기설비학회논문지
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• 제22권9호
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• pp.69-74
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• 2008

동절기 전차선의 서리와 결빙은 매우 심각한 문제를 발생시킬 수 있다. 팬터그래프의 집진 스트립의 기계적 표면과 전차선 사이에 서리 또는 결빙으로 인한 아크가 발생하게 된다. 이에 따른 전기적 저항은 팬터그래프와 전차선 사이의 전류의 풀질을 감소시킨다. 해빙시스템은 통절기 전차선의 서리와 결빙을 녹이는 역할을 한다. 해빙시스템의 원리는 전차선의 임피던스의 Joule열을 이용하여 서리와 결빙을 제거하는 것이므로 전차선의 온도는 인가전류가 증가할수록 증가하였으며, 풍속이 증가할수록 감소하는 것을 알 수 있었다.

• Steel and Composite Structures
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• 제22권4호
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• pp.745-752
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• 2016

An investigation has been done to study the evolution of the microstructure, mechanical and electrical properties of AlMgSi alloy destined for the transport of electric energy, in function of the deformation caused by the cold drawing process. We identified that drawing of aluminum wire causes development of a fibrous texture of type <111> and <100>. We notice also that the electrical resistivity and mechanical resistance increases with the increasing of the deformation level. Characterization methods used in this work is: The Electron Back Scattered Diffraction EBSD, X-Ray diffraction, Vickers microhardness, Tensile test, Measuring electrical resistivity, the Scanning Electron Microscope (SEM) and Energy Diffraction Spectrum (EDS).

• 한국화재소방학회논문지
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• 제24권4호
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• pp.104-108
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• 2010

본 논문은 카본열선을 사용하는 전기장판에서 발생한 전기화재에 관하여 기술하였다. 카본열선을 사용하는 전기장판은 카본 재질의 특성상 전기용접이나 납땜 등의 방법으로 접속이 불가능하며, 열선 끝단을 카본 재질의 연결부를 만들어 접속해야 한다. 이러한 과정에서 열선 사이의 불완전 접속이 발생되며, 불완전 접속부에는 접촉저항의 증가로 국부적인 발열이 발생되고, 최종적으로 화재사고로 진전된다. 본 논문에서는 카본 열선 접속부에서 불완전 접속이 형성되는 경우, 접속부에서 전기적 발열에 의해 발생되는 열선의 손상 형태를 분석하여 화재원인을 규명하였다. 이러한 분석 결과는 카본 열선을 사용하는 전기장판의 화재원인 조사의 기초 자료로 활용 가능할 것으로 기대한다.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2009년도 추계학술발표대회 논문집
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• pp.115-120
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• 2009

In this paper, we measurement the resistance on the flat wire for PV module. There is some kind of flat wire that has different length and different contact area in the PV module. so we test the resistance on each case for analysis with common connection method. we measurement the electrical output characteristics and phenomenon of PV module that is applied new connetion method. by the result, The fill factor and electrical output characteristics on PV module are analyzed to getting better more then common connection method. Finally we recommend the developed connection method for diminishing of resistance on PV module. It enhance the electrical character more than common connection method.

• 항공우주시스템공학회지
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• 제5권1호
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• pp.13-16
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• 2011

All components such as structure, engine, electrical equipment, wire etc. should have certified qualities and functions for safe flight. The wire like a blood vessel of man is connected with most components and supply a electrical signal or power to them and only certified wire through a lot of tests such as rating, flame resistance, self-extinguishing, protection of EMI etc. must be used in aircraft. In other words, the wire should observe many certification requirements because it is one of the most important components.

• 한국초전도ㆍ저온공학회논문지
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• 제13권3호
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• pp.14-18
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• 2011

Electrical system is changing to smart grid which includes the distributed generations with reusable energy sources in these days. The distributed generations are environmentally friendly and have no concern with depletion problem. But dispatching distributed generations can cause an increase of the fault current. Resistive type super conducting fault current limiter is one of the candidates of solution for the large fault problem in smart grid. In this paper, a design method for the wire length of fault current limiter and the result of short circuit test for small scale modules considering system resistance are introduced.

• 조명전기설비학회논문지
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• 제24권10호
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• pp.85-89
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• 2010

During a ground fault the maximum fault current and neutral to ground voltage will appear at the pole nearest to the fault. Distribution lines are consisted of three phase conductors, an overhead ground wire and a multi-grounded neutral line. In this paper phase to neutral faults were staged at the specified concrete pole along the distribution line and measured the ground fault current distribution in the ground fault current, three poles nearest to the fault point, overhead ground wire and neutral line. A effect by grounding resistance of poles of ground fault current in the 22.9[kV] multi-ground distribution system. by field tests.

• 한국전기전자재료학회논문지
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• 제28권3호
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• pp.191-195
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• 2015

Inside the existing superconducting cables, the superconducting wire carries a loss-free current, and the cable former (the stranded copper wire) bypasses the fault current to prevent damage and loss of the superconducting cable when the fault current is applied. The fault-current-limiting-type superconducting cable proposed in this paper usually carries a steady current; but in a fault state, the cable generates self-resistance that makes the fault current lower than a certain width. That is, the superconducting cable that transmitted only a low voltage and a large capacity power repetitively limits the fault current, as does a superconducting current limiter. To complete this structure, it is essential to investigate the mutual resistance relationship between the superconducting wires after applying a fault current. Therefore, in this paper, one kinds of superconducting wires (a wire without a stabilization layer) were connected parallel 4 tapes, respectively; and after applying a fault current, the current, voltage, resistance and thermal stability of the HTS thin-film wires were examined.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2010년도 하계학술대회 논문집
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• pp.190-190
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• 2010

The resistance and recovery properties of the YBCO thin-film wire according to the existence and thickness of an insulting layer, and the kinds of stabilization layers, were analyzed at 90 K, 180 K and 250 K. In this study, YBCO thin-film wires with different stabilizing layers and with insulating layers were examined in terms of their various characteristics, such as quenching occurrence, spread, and distribution, based on their resistance increase trends and their recovery from quenching, and the results were qualitatively explained. The results of this study on the characteristics of YBCO thin-film wires' superconducting and normal-conducting phase changes are expected to be useful in designing superconducting power machines and in improving their performance.

• 전기학회논문지
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• 제63권3호
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• pp.331-337
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• 2014

The Korean distribution system consists of overhead ground wire (OHGW), phase conductors and neutral wire. Especially, OHGW is installed over the phase conductors to protect distribution system from the lightning surge. The flashover rate and the magnitude of lightning overvoltage on distribution system can be affected by grounding condition of OHGW such as grounding resistance and grounding interval. In this paper, we conduct an analysis of lightning overvoltage and flashover rate according to the grounding condition of OHGW. The distribution system and lightning surge are modeled by using ElectroMagnetic Transient Program (EMTP). Also, the Monte Carlo method is applied to consider random characteristics of lightning, and the flashover rate is calculated based on IEEE std. 1410. The simulations are performed by changing the grounding resistance and interval of OHGW and the simulation results are analyzed.