• Title/Summary/Keyword: Biased installation

Search Result 15, Processing Time 0.052 seconds

슬리브 시공유형별 기계적 및 열적 가속열화특성 분석 연구

  • An, Sang-Hyeon;Kim, Byeong-Geol;Kim, Sang-Su;Son, Hong-Gwan;Park, In-Pyo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2009.11a
    • /
    • pp.286-286
    • /
    • 2009
  • According to previous report, aged sleeves for old transmission lines have various defect such as biased installation or corrosion of steel sleeve. These defects can cause serious accidents such as rapid increasing of sag or falling out of overhead conductor from sleeves. Moreover, the defects have been limited power capacity of transmission line. This paper study on mechanical and thermal behavior of ACSR $410mm^2$ conductor and sleeve with various defect model. The conductor has been aged artificially for 50 years. The detailed results were presented in the text.

  • PDF

The Study on Thermal Properties of Sleeve with Various Defects (시공유형에 따른 가공송전선 접속개소의 열적 특성 분석 연구)

  • Ahn, Sang-Hyun;Kim, Byung-Geol;Kim, Sang-Shu;Shon, Hong-Kwan;Park, In-Pyo;Kim, Sung-Kyu
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2008.11a
    • /
    • pp.461-461
    • /
    • 2008
  • According to previous report, aged sleeves for old transmission lines have various defect such as biased installation or corrosion of steel sleeve. These defects occupied almost 50 percent of investigated aged sleeves. The defects have been limited power capacity of transmission line. And it can cause serious problems such as rapid increasing of sag or falling out of overhead conductor from sleeve. This paper study on thermal behavior of sleeve with various defect model. The detailed results were presented in the text.

  • PDF

The Study on Aged Sleeves for Old Transmission Lines (노후 송전선로의 가공송전선 직선 슬리브 분석 연구)

  • Kim, Byung-Geol;Kim, Shang-Shu;Ahn, Sang-Hyun;Sohn, Hong-Kwan;Park, In-Pyo;Jang, Tae-In
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2007.06a
    • /
    • pp.538-540
    • /
    • 2007
  • A detailed study on aged sleeves for old transmission lines was carried out to clarify the deterioration of sleeves and the condition of installation. A lot of removed aged sleeves from transmission lines were investigated. Many biased installed cases and corrosion of steel sleeve part were found. These defects can cause a serious accident such as blackout during operating. The detailed results were presented in the text.

  • PDF

The Study on Aged Sleeves for Old Transmission Lines (노후 송전선로의 가공송전선 직선 슬리브 분석 연구)

  • Kim, Byung-Geol;Kim, Shang-Shu;Sohn, Hong-Kwan;Park, In-Pyo;Jang, Tae-In;Kim, Jin-Han
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.20 no.11
    • /
    • pp.1009-1014
    • /
    • 2007
  • A detailed study on aged sleeves for old transmission lines was carried out to clarify the deterioration of sleeves and the condition of installation. A lot of removed aged sleeves from transmission lines were investigated. Many biased installed cases and corrosion of steel sleeve part were found. These defects can cause a serious accident such as blackout during operating. The temperature distribution within sleeve of ACSR conductor was precisely measured and examined, conducted as part of series of studies on large currents in transmission lines. According to measurements of the conductor temperature near a joint(sleeve and clamp), the electrical resistance of joint is lower than that of the same length conductor. The detailed results were presented in the text.

Design of Buck-Boost DC-AC Inverter Using Microcontroller (마이크로컨트롤러를 이용한 벅-부스트 DC-AC 인버터 설계)

  • Park, Jong-Gyu
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.23 no.10
    • /
    • pp.45-51
    • /
    • 2009
  • The single phase buck-boost DC-AC inverter generates an alternating output voltage as the differential voltage of two DC-DC individual buck-boost converters. Two converters are driven with DC-biased and $180[^{\circ}]$ phase-shifted sinusoidal references. The peak value of the inverter alternating output voltage does not depend on the direct input voltage. In this paper, single phase buck-boost DC-AC inverter is designed and implemented on a prototype with digital controller using a microcontroller.

Study on Memristive Characteristics in Electronic Devices Based on Vanadium Dioxide Thin Films Using 966nm Laser Pulses (966nm 레이저 펄스를 이용한 바나듐 이산화물 박막 기반 전자 소자에서의 멤리스터 특성에 관한 연구)

  • Kim, Jihoon;Lee, Yong Wook
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.29 no.11
    • /
    • pp.59-65
    • /
    • 2015
  • By harnessing the thermal hysteresis behavior of vanadium dioxide($VO_2$), we demonstrated multi-resistance states in a two-terminal electronic device based on a $VO_2$ thin film by using a 966nm infrared laser diode as an excitation light source for resistance modulation. Before stimulating the device using 966nm laser pulses, the thermal hysteresis behavior of the device resistance was measured by using a temperature chamber. After that, the $VO_2$ device was thermally biased at ${\sim}71.6^{\circ}C$ so that its temperature fell into the thermal hysteresis region of the device resistance. Six multi-states of the device resistance could be obtained in the fabricated $VO_2$ device by five successive laser pulses with equal 10ms duration and increasing power. Each resistance states were maintained while the temperature bias was applied. And, the resistance fluctuation level was within 2.2% of the stabilized resistance and decreased down to less than 0.9% of the stabilized resistance 5s after the illumination.

A Study on the Transformation of the Oe-am Folk Village -From 1988 to 2001 (after Designated as a Traditional Preservation Area) - (아산(牙山) 외암(外岩)마을의 주거변화(住居變化)에 관한 연구(硏究) -1988년 전통건조물보존지구 지정 이후 2001년까지-)

  • Lee, Wang-Kee;Lee, Kang-Bok;Choi, Hong-Kee
    • Journal of architectural history
    • /
    • v.10 no.3 s.27
    • /
    • pp.77-91
    • /
    • 2001
  • The study is the analysis on Oe-am village which is designated as a folk-preservation village in 1988 and is included in the fact of the dwelling change through Spot-Survey and Case-Investigation in the last decade from now(2001), The result shows the main change on the stand-up dining room installation, the place with the boiler and bathroom installation, the additional expansion through the combination of the small twice or third space, the using change, the prototype restoration. The reason of this change is shown the following. 1. There is the dual structure that the villager repairs that because the repairing operation is biased the prototype restoration since the government construction. 2. The internal change is come from more at thatched house than at tiled house and the order of the main element's change is Kitchen (35%), main room (30%), living room (24%) and other rest room (11%). 3. The change of the dining room in the internal composition material is the strongest and the change is included in the using change, the installation of the new sub-division in the spot and the expansion of the outside if necessary. The reason of the main change is life-style's. Therefore we can know the change of the dwelling structure and we are able to make a modern-life. Also, If the restoration or repair is necessary, the change element on that must be considered.

  • PDF

The Study on Mechanical and Thermal Properties of ACSR 480Rail Conductor with Various Defects (시공유형에 따른 ACSR 480Rail 가공송전선 접속개소의 기계적 및 열적 특성 연구)

  • Ahn, Sang-Hyun;Kim, Byong-Geol;Kim, Sang-Su;Sohn, Hong-Kwan;Park, In-Pyo
    • Proceedings of the KIEE Conference
    • /
    • 2009.07a
    • /
    • pp.1297_1298
    • /
    • 2009
  • According to previous report, aged sleeves for old transmission lines have various defect such as biased installation or corrosion of steel sleeve. These defects occupied almost 50 percent of investigated aged sleeves. These defects can cause serious accidents such as rapid increasing of sag or falling out of overhead conductor from sleeves. Moreover, the defects have been limited power capacity of transmission line. This paper study on thermal behavior of ACSR 480Rail conductor and sleeve with various defect model. The detailed results were presented in the text.

  • PDF

The Study on Tension and thermal properties of Corrosive-fractured Steel Sleeve (강 슬리브 파단 직선 슬리브의 장력 및 열적 특성 분석 연구)

  • Ahn, Sang-Hyun;Kim, Byung-Geol;Kim, Shang-Shu;Sohn, Hong-Kwan;Park, In-Pyo;Kim, Sung-Kyu
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2008.06a
    • /
    • pp.104-105
    • /
    • 2008
  • According to previous report, aged sleeves of old transmission line showed several defaulted installation patterns, which is biased or corrosive-fractured of steel sleeve installed cases. The latter case occupied almost 25 percent of investigated aged sleeves. These defects can cause serious accidents such as rapid increasing of sag or falling out of overhead conductor from sleeves. This paper studies thermal properties and tension for ACSR conductor in case of fractured steel sleeve model. The detailed results were presented in the text.

  • PDF

The Electrical Characteristics of Shading Effect in Photovoltaic Module (PV모듈에서 그림자에 의한 전기적 특성)

  • Kim, Seung-Tae;Kang, Gi-Hwan;Park, Ji-Hong;Ahn, Hyung-Keun;Yu, Gwon-Jong;Han, Deuk-Young
    • 한국태양에너지학회:학술대회논문집
    • /
    • 2008.04a
    • /
    • pp.257-262
    • /
    • 2008
  • In this paper, we study the electric characteristics of shading effects in photovoltaic module in case of outdoor operation. When fabricating PV module, solar cells are connected serially to obtain the high voltage because of its low open circuit voltage. And total current is determined by lowest current among solar cells. When the shading happens on PV module's surface, the current of shaded solar cell determine the total current flow. Because of this, generally by-pass diode is installed on junction box. The bypass diode operate when revered and shaded solar cell's voltage is over 0.6 voltage. The reverse-biased solar cell gives reduced maximum power of PV module and might give negative effect on durability. So, adequate by-pass installation and selection is needed.

  • PDF