• Title/Summary/Keyword: electric wire

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Comparison Analysis of Field Test Methods Based on Technical Criteria of Electrolytic Corrosion Protection in Urban Railway (도시철도 전식방지 기술기준에 따른 시험방법 비교분석)

  • Kim, Jae-Moon;Jung, Ho-Sung
    • Proceedings of the KSR Conference
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    • 2010.06a
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    • pp.1885-1891
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    • 2010
  • Recently metropolitan local governments is actively introducing urban railway's expand and light rail transit as a means of new transport system. DC electricity feeder system operating in the domestic urban railway is typically a feedback circuit consisted of the contact wire and electric railway vehicle via rail. But stray current is to be defined as a current flowing on a structure that is not part of the intended electrical circuit with respect to a given structure. Stray current is generally results from the leakage of return currents from large DC traction systems that are grounded or have a bad earth-insulated return path. At the place where the current leaves the rail and metallic structures, electrolytic corrosion may take place. This paper presents comparison analysis of field test methods based on criteria of electrolytic corrosion protection of buried metallic structures adjacent to DC traction systems.

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Development of measuring system of dynamic characteristics for tilting pantograph on the Korean Tilting Train (한국형 틸팅열차의 틸팅 판토그래프 동특성 측정시스템 개발)

  • Mok, Jin-Yong;Kim, Seog-Won;Kim, Young-Guk;Kim, Ki-Hwan
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.692-697
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    • 2007
  • The current collection system, pantograph, is one of the important subsystems in electric train system, because of it's fatal function and role of supplying power to the train system. Generally, the function of current collection system is evaluated by loss of contact rate between pantograph and contact wire in catenary by measuring arcs, or by statistical method of evaluating minimum mean contact force. The Korean Tiling Train(TTX) has been manufactured by KRRI and Korean domestic companies and is preparing the trial running test of itself. In this paper, we introduce our successful achievement, measuring system and applied methods of dynamic characteristics for the tilting pantograph, developed of by our own technology.

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Effect of Heat Treatment on the Surface Machined by W-EDM (고온 열처리가 와이어 컷 가공면에 미치는 영향)

  • Choi, K.K.;Lee, Y.S.
    • Transactions of Materials Processing
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    • v.15 no.8 s.89
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    • pp.539-543
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    • 2006
  • Experimental studies are carried out in order to investigate the effects of heat treatment on the surface machined by W-EDM. In this work, two ways of heat treatment after W-EDM are considered. As a comparison, the machined surface by a traditional method such as milling/grinding is also considered. Thereby, specimens are prepared by four different machining methods. Those are (1) milling and then grinding, (2) wire-cut electric discharge machining (W-EDM), and (3) low temperature heat treatment or (4) high temperature heat treatment after W-EDM. The resulting surface roughness are measured and the changes of surface microstructures are investigated using the scanning electron microscope (SEM) with energy dispersive X-ray spectrometer (EDS). In general, heat treatment after W-EDM result in smoother surface and better chemical composition at the machined surface. Especially, high temperature tempering could remove defects in the thermally affected zone, which cause an overall deterioration of the surface machined by W-EDM.

Technical Trend of TSV(Through Silicon Via) Filling for 3D Wafer Electric Packaging (3D 웨이퍼 전자접합을 위한 관통 비아홀의 충전 기술 동향)

  • Ko, Young-Ki;Ko, Yong-Ho;Bang, Jung-Hwan;Lee, Chang-Woo
    • Journal of Welding and Joining
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    • v.32 no.3
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    • pp.19-26
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    • 2014
  • Through Silicon Via (TSV) technology is the shortest interconnection technology which is compared with conventional wire bonding interconnection technology. Recently, this technology has been also noticed for the miniaturization of electronic devices, multi-functional and high performance. The short interconnection length of TSV achieve can implement a high density and power efficiency. Among the TSV technology, TSV filling process is important technology because the cost of TSV technology is depended on the filling process time and reliability. Various filling methods have been developed like as Cu electroplating method, molten solder insert method and Ti/W deposition method. In this paper, various TSV filling methods were introduced and each filling materials were discussed.

Manufacturing Technique and Material Properties for 1/5-Scale Reinforced Concrete Frame Model (1/5 축소 3층 철근콘크리트 골조 모델의 제작기법 및 재료특성 연구)

  • 이한선;우성우;고동우;허윤섭;강귀용
    • Proceedings of the Korea Concrete Institute Conference
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    • 1997.10a
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    • pp.575-580
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    • 1997
  • This study presents the techniques to manufacture the model concrete and model reinforcement for the 1/5-scale 3-story reinforced concrete frame. The used model concrete has sufficient workability but shows a little lower strength than expected model steel was made of commercial $\phi$3.2mm and $\phi$2.0mm wire by using deforming device and vacuum tube electric furnace. The yield strength can be simulated but it was difficult to simulate the other properties. The load cell was specially manufactured to measure the shear force in the columns of the first story. The carrying frame and the hinge adapter of artificial mass are explained. The special problems in the process of construction of model are also dressed.

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The Matrix Green's Function by Superimposing Induced Current and Source and Its Application (유기전류 및 전원의 중첩에 의한 행열 그린함수와 그 응용)

  • 정백호;김채영;구본희
    • Journal of the Korean Institute of Telematics and Electronics A
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    • v.32A no.12
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    • pp.55-63
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    • 1995
  • By employing the concept of superimposing the induced current on partial scattere roled as a secondary source, matrix Green's function was derived. The procedure in the way of derivation presented here was based on the equivalence principle and the induction theorem and applying moment methods to the resulting electric field integral equation. As examples, the induced current on scatterers consisted of wire/plate conductor, the input impedance and gain patterns of corner reflector antenna were calculated. And computing times required for solving matrix equation were compared with those of conventional method.

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Analysis of Current Distribution of HTSC Power Cable Considering Shield Layer (차폐층을 고려한 고온초전도 전력 케이블의 전류분류 해석)

  • Lee, Jong-Hwa;Lim, Sung-Hun;Ko, Seok-Cheol;Park, Chung-Ryul;Han, Byoung-Sung;Hwang, Si-Dole
    • Proceedings of the KIEE Conference
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    • 2004.04a
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    • pp.12-14
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    • 2004
  • Superconducting transmission power cable is one of interesting parts in power application using high temperature superconducting wire. One of import ant parameters in high-temperature superconduting (HTSC) cable design is transport current distribution because it is related with current transmission capacity and AC loss. In this paper, the transport current distribution at conducting layers was investigated through the analysis of the equivalent circuit for HTSC power cable with shield layer and compared with the case of without shield layer. The transport current distribution due to of the contact resistance and the pitch was improved in the case of HTSC power cable with shield layer from the analysis.

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Application of Wireless Sensor for Diagnostics of Electric Equipments (전력 설비 진단을 위한 무선 센서의 응용)

  • Yun, Ju-Ho;Choi, Yong-Sung;Hwang, Jong-Sun;Lee, Kyung-Sup
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.2112-2113
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    • 2008
  • The concept is based on distributed wireless sensors that are attached to the incoming and outgoing power lines of secondary substations. A sensor measures only phase current characteristics of the wire it is attached to, is not synchronized to other sensors and does not need configuration of triggering levels. The main novelty of the concept is in detecting and locating faults by combining power distribution network characteristics on system level with low power sampling methods for individual sensors. This concept enables the sensor design to be simple, energy efficient and thus applicable in new installations and for retrofit purposes in both overhead and underground electrical distribution systems.

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AC Breakdown Strength for Mini Model Cables with Nano-Semiconductive Layer (나노반도전 미니모델케이블의 AC절연파괴특성)

  • LEE, Seung-Won;KIM, Su-Hwan;KIM, Yong-Hyun;LIM, Jang-Seob;LEE, Kun-Ho;LEE, Won-Suck
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.1183-1183
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    • 2015
  • 본 연구에서는 기존 및 개발된 나노반도전에 대한 전계완화역할에 따른 전기적 특성평가를 위해 반도전 종류별로 제작된 이중압출 미니모델케이블을 이용하여 AC 절연파괴시험을 수행하여 절연파괴특성을 확인하였다.

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A VLF Breakdown Strength Test of The XLPE Cable on Thermal Aging (열 열화에 따른 XLPE의 VLF 절연파괴 특성)

  • LEE, Seung-Won;KIM, Su-Hwan;KIM, Yong-Hyun;LIM, Jang-Seob;LEE, Kun-Ho
    • Proceedings of the KIEE Conference
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    • 2015.07a
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    • pp.1215-1215
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    • 2015
  • 본 연구에서는 상용 XLPE 절연체에 ES(한전)의 장기과통전 시험 기준을 참고하여, 가속 열 열화 하였고, 열화 전/후의 절연특성을 비교하기 위하여 VLF(0.1Hz) 내전압 파괴시험을 수행하였다. 또한, 그 결과를 Weibull plot하여 절연특성을 통계적으로 비교 및 분석하였다.

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