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김상수,김병걸,장태인,강지원,이동일,민병욱,Kim Shang-Shu,Kim Byung-Geol,Jang Tae-In,Kang Ji-Won,Lee Dong-Il,Min Byung-Uk 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.3
This paper describes mechanical and electric properties of ACSR $410\;mm^2$ conductor from many of older overhead conductor. Samples of conductors itemized two division according to operation sector, green area, salt and pollution area. Samples of conductors operated various environment conditions have undergone laboratory metallurigical investigation and tensile strength torsional ductility and electrical performance. The steel core were found to have retained their original properties to a large degree in both tensile strength and the number of turns to failure. On the other hand the aluminum conductor showed reductions in tensile strength. To determine the remaining useful life of aged conductor, an unacceptable deterioration level has to established for each diagnostic procedure.
경년열화가 가공송전선(STACIR/AW)용 강심소재 Al Clad Invar 강선의 피로에 미치는 영향 ( 1 )
김상수,김병걸,현석규,신구용,이동일,민병욱,Kim Shang-Shu,Kim Byung-Geol,Hyun Suk-Kyu,Sin Goo-Yong,Lee Dong-Il,Min Byung-Uk 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.1
Fatigue properties of INVAR/AW wires have been investigated under the heat exposure in order to ensure stable operation and to estimate life span of their power line. In the case of heat exposure for 10000 hr, fatigue life and limit increased. For further heat exposure, fatigue limit decreased due to the decrease in yield strength. The variation fatigue of strand wire was strongly dependent on its amplitude. Also, cracks in wires of 7 strands were caused by stress concentration at the outer surface and fretting between each wire during vibration.
경년열화가 증용량 저이도 송전선의 기계적특성에 미치는 영향 (II)
김상수,김병걸,신구용,이동일,민병욱,Kim Shang-Shu,Kim Byung-Geol,Sin Goo-Yong,Lee Dong-Il,Min Byung-Uk 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.1
Today, restricted energy sources, environmental considerations and the high cost of transporting fuel have limited the number and location of available power plant sites. The pressures resulting from these conditions have tended to require the construction of long, high-capacity, high-voltage power lines. it's used to adapt to STACIR/AW(Super Thermal-resistant Aluminum alloy Conductors, aluminum-clad Invar-Reinforced) conductor for coping with these situations. STACIR/AW conductor was formed by the combination of INVAR/AW as the core for low sag and super thermal-resistant aluminum alloy conductor for current capacity increase. increase of temperature by current capacity and long span lines make the susceptible to the deterioration of thermo-mechanical properties(conductivity, tensile strength, E-modulus and twist property et al). In the present work, changes of thermo-mechanical properties with aging have been studied in STACIR/AW $410 mm^2$ conductor with forms of single wire and strand wire.
김상수,구재관,이영호,김병걸,Kim, Shang-Shu,Ku, Jae-Kwan,Lee, Young-Ho,Kim, Byung-Geol 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.5
The new recycling technology for aged Aluminum wires in overhead conductor have been carried out. We are attempting to develop remanufacturing method for them for more effective way of recycling in stead of its conventional remelting process. The weld of aged aluminum wires play a vital role in remanufacture process. The paper investigates the mechanical properties during cold welding process of aged Aluminum wire. The tensile tests and microscopic analysis results are discussed to underscore the hardening features of welded aluminum wire. Various graphs are presented accompanied by discussion about their relevance on the process.
김상수,구재관,이영호,김병걸,Kim, Shang-Shu,Ku, Jae-Kwan,Lee, Young-Ho,Kim, Byung-Geol 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.7
The new recycling technology for aged aluminum wires in overhead conductor has been carried out. The authors are attempting to develop remanufacturing method for them for more effective way of recycling in stead of its conventional remelting process. The new recycling technology for aged aluminum wire in overhead conductor was composed of four steps in different develop process, destranding process for conductor, surface cleaning process, welding process and drawing process for aluminum wire. This paper investigates the properties during recycle process of aged aluminum wire. The results of microscopic analysis and mechanical properties were discussed to underscore recycling aluminum wire. Various graphs are presented accompanied by discussion about their relevance on the process. In conclusion, we confirmed the possibility of remanufacturing technique by using new process.
김상수,구재관,이영호,김병걸,Kim, Shang-Shu,Ku, Jae-Kwan,Lee, Young-Ho,Kim, Byung-Geol 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.6
The new recycling technology for aged aluminum wires in overhead conductor have been carried out. We are attempting to develop remanufacturing method for them for more effective way of recycling in stead of its conventional remelting process. The drawing process of aged aluminum wires play a role in remanufacture process. Drawing process was performed under lubricant. The speed of drawing was between 500 m/min and 1,000 m/min. These machines have 11 or 12 dies house for breakdown of the feedstock. Material of the die is tungsten carbide and they have generally 25% reduction ratio. The paper investigates the mechanical properties during drawing process of aged aluminum wire. The results of tensile tests and microscopic analysis were discussed to underscore the hardening features of drawing aluminum wire. Various graphs are presented accompanied by discussion about their relevance on the process.
STACIR/AW 410SQmm 가공송전선의 경년열화와 이도거동(III)
김상수,김병걸,신구용,이동일,민병욱,Kim Shang-Shu,Kim Byung-Geol,Sin Goo-Yong,Lee Dong-Il,Min Byung-Uk 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.3
As a way to expand electric capacity in conductor with electric power demand, STACIR/AW (Super Thermal-resistant Aluminum-alloy Conductors Aluminum-clad Invar-Reinforced) conductor which has high electric current and heat resistance characteristics have been developed. STACIR/AW power line is mechanical composite wire composed of steel cores for dip control and aluminum conductors for sending electric current. Recently, to ensure stable operation and prediction of wire life span of STACIR/AW conductor, a heat property of STACIR/AW conductor have been investigated. In the present work, a change of essential property with long term-heat exposure of STACIR/AW conductor and its structure material, INVAR wire and Al conductor, have been investigated. INVAR/AW is approximately $3.2\;{\mu}m/m^{\circ}C$. thermal expansion coefficient of INVAR/AW wire increases with time of heat exposure. the thermal expansion coefficient of INVAR/AW is markedly influenced by heat and mechanical treatment. creep rate(0.242) of STACIR/AW $410\;mm^2$ conductor at room temperature is much higher than that(0.022) at $210\;^{\circ}C$ STACIR/AW $410\;mm^2$ conductor has minimum creep rate at operating temperature. To lower creep rate with increase temperature is more unique characteristics in STACIR/AW. It is expected that STACIR/AW turned its tension to INVAR/AW at the transition temperature. at room temperature, the tension apportionment of INVAR/AW in STACIR/AW is about $50\;\%$. but whole tension of STACIR/AW is placed on the INVAR/AW alone of core metal above transition temperature.
김상수,김병걸,현석규,이동일,민병욱,Kim Shang-Shu,Kim Byung-Geol,Hyun Suk-Kyu,Lee Dong-Il,Min Byung-Uk 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.5
A research was undertaken on the thermal properties and behavior of the conductors in a controlled chamber, which was designed to implement the outdoor air temperature, heat and wind conditions. With ACSR $410mm^2$ overhead conductors, we measured the maximum temperature of the conductors and the temperature gradient from the core to the surface regions as a function of current, tension, wind velocity and outdoor air temperature. This test also provided a comparative analysis between the measured temperature values of conductors in the controlled chamber and the theoretical calculations of ANSI/IEEE at normal condition.
장력과 풍속이 ACSR 가공송전선의 온도에 미치는 영향
김상수,김병걸,이동일,민병욱,Kim Shang-Shu,Kim Byung-Geol,Lee Dong-Il,Min Byung-Uk 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.5
A research was undertaken on the thermal properties and behavior of the conductors in a controlled chamber, which was designed to implement the outdoor air temperature, heat and wind conditions With ACSR $410mm^2$ overhead conductors, we measured the maximum temperature of the conductors and the temperature gradient from the core to the surface regions as a function of current, tension, wind velocity and outdoor air temperature. This test also provided a comparative analysis between the measured temperature values of conductors in the controlled chamber and the theoretical calculations of ANSI/IEEE at normal condition. There was not much influence of tension on the conductor temperature. However, the compactness of conductor wires increased with an increase in tension, which eventually increased the coefficient of effective thermal conductivity and, accordingly the conductor temperature was reduced more or less.
Al-0.11Fe계 합금에서의 Zr, Sc원소 미세첨가에 따른 연속주조재 및 압연재의 특성
김병걸,김상수,김성규,김지상,김진한,Kim, Byung-Geol,Kim, Shang-Shu,Kim, Sung-Kyu,Kim, Ji-Sang,Kim, Jin-Han 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.12
In order to develop non-heated STAl(super thermal resistant Aluminum alloy) for ampacity gain conductor, the systematic research was carried out. Especailly, the effect of a very small amount of Zr, Sc element in EC grade Al ingot on mechanical and electrical properties was our priority. As a result, it was found that the strength and recrystallization temperature of designed alloy was gradually increased with Zr, Sc addition up to 0.3 wt.%. However, the electric conductivity showed no drastic change. The tensile strength and recrystalliztion temperature, $17.75{\sim}20.05\;kgf/mm^2$ and $420{\sim}520\;^{\circ}C$, was obtained at 0.3 wt.% Zr, Sc addition, respectively. Particles of the $Al_3Zr$ and $Al_3Sc$ phase affected the ambient and elevated-temperature strength of the alloys.