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가공송전선 알루미늄 도체의 연속다단압연에 의한 조직 변화가 전기적, 기계적 특성에 미치는 영향
김종배(Jong-Bae Kim),김병걸(Byung-Gul Kim),김상수(Shang-Shu Kim),장용호,안상현(Sang-Hyun An),구재관(Jae-Kwan Ku),이영호(Young-Ho Lee),조영민(Young-Min Cho) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
The Effect of Microstructural changes on Electrical, Mechanical Property by multi-rolling for Overhead Conductors. The obtained property of Al wires will be controled by the conditions of continuous casting production process, especially, the extrusion and drawing process which is followed by the formation of cast bar, should be critical factor process in determining the performance of Al wire. Therefore, advanced countries like Italy and America have researched into the technique to improve efficiency of aluminum wire production. In this study, the authors have investigated the effects of hot multi-rolling process on mechanical, electrical property and its microstructure of Al rods.
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.
김병걸,김상수 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.11
This paper describes the bending fatigue properties of the high-carbon steel wire containing around 0.6 wt.% C, which is used as a stranded wire for ACSR(Aluminum Stranded Conductors Steel Reinforced) in transmission power lines. ACSR which consists of galvanized steel strand and aluminum one always experiences serious vibration by wind. Therefore, it is very important to clarify the fatigue property of core wire for ACSR to determine its lifetime and stability of power delivery. Since steel wires are produced by wire drawing process, they possess a very long fiber lamellar microstructure which has a very short inter-layer distance between ferrite and cementite layer. The long fiber lamellar microstructure is expected to have a different fatigue behavior compared to conventional plate and bulk-type materials. In order to characterize the fatigue property of cold-drawn high-carbon steel wires, bending fatigue tests were carried out on specimens drawn to various strains. The fatigue strength was about 38 kgf/㎟ at ε= 1.19, which was higher than the required strength of 32 kgf/㎟. This is probably due to the very fine elongated pearlitic microstructure formed by the drawing process, which suppresses formation and growth of microcracks. The several unique characteristics of drawn wires are also discussed.
가공송전선 (ACSR) 용 고탄소강선의 Tension-tension 피로특성
김병걸,우병철,김상수 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.6
This paper describes the tension-tension fatigue properties of high-carbon steel wire containing around 0.6wt.% C, which is used as a stranded wire for ACSR(Aluminum Stranded Conductors Steel Reinforced) in transmission power lines. ACSR which consists of galvanized steel strand and aluminum core always experiences serious vibration by wind. Therefore, it is very important to clarify the fatigue property of core wire for ACSR to determine its lifetime and stability of power delivery. Since steel wires are produced by a wire drawing process, they possess a very long fiber-lamellar microstructure which has a very short inter-layer distance between ferrite and cementite layer. The long fiber-lamellar microstructure is expected to have a different fatigue behavior compared to conventional plate and bulk-type materials. In order to characterize the fatigue property of steel wire having the unique microstructure mentioned above, tension-tension fatigue tests were carried out on specimens drawn to various strains. The fatigue strength was 106.7㎏f/㎟ at ε=1.79, and 92.0㎏f/㎟ at ε=1.19, which showed an inverse relationship with drawing strains. The fatigue strength of a hard-drawn wire was as high as 66∼70% level of its tensile strength. This value was very high compared to that of rolled or full-annealed materials, which exhibited 40∼60% level of their tensile strength. The high fatigue strength is attributed to the very fine elongated pearlitic microstructure formed by the drawing process, which suppresses formation and growth of microcracks. A good correlationship between theoretical fatigue strength and experimental one was found, which meant that yield and tensile strength were the main factors to affect the fatigue property of the steel wire.
김병걸,김상수,한세원,김진한,Kim, Byung-Geol,Kim, Shang-Shu,Han, Se-Won,Kim, Jin-Han 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.12
Because forest fire can give a serious damage to overhead conductors, the thorough understanding about aging behavior of burned conductor is very important in maintaining the transmission line safely. Therefore, a systematic investigation was carried out by heating method. As the heating temperature increases, drastic change of tensile strength of Al wire due to the softening of Al wire occurred. When Al wire is exposed to the flame(about $800\;^{\circ}C$) during only 13 seconds, the remained tensile strength of Al wire showed under 90 %. The detailed results will be given in the text.
김병걸,김상수,왕윤찬,Kim, Byung-Geol,Kim, Shang-Shu,Wang, Yun-Chan 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.10
The effects of elastic modulus coefficient and linear expansion coefficient of overhead distribution power line(ACSR $58 mm^2$) on sag behavior in distribution line have been investigated to clarify the difference between specification and experimental level. The elastic modulus coefficients of Al wire and steel wire were $5,182.6 kgf/mm^2,\;18,348.8 kgf/mm^2$, respectively Therefore, the computational composition elastic modulus coefficient of the power line was $7,063.5 kgf/mm^2$, while that of experimentally measured was $7681.1 kgf/mm^2$. As a result, we found that elastic modulus coefficient which was experimentally measured was higher than that of computational by 8.7 %. However, when planner designs the sag of disoibution line, the elastic modulus coefficient of power line $8,400 kgf/mm^2$ should be generally adopted. These two different using values lead to the sag difference of 0.62 m. The other results will be discussed.
통전 중 산불에 노출된 가공송전선의 온도 및 장력 변화 거동
김병걸,장용호,김상수,한세원,Kim, Byung-Geol,Jang, Young-Ho,Kim, Shang-Shu,Han, Se-Won 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.4
The authors have published several technical reports on the deterioration of conductor due to forest fire in series so far. This is because even we have been experiencing hundreds of forest fires every year, no systematic research on conductor which is very vulnerable to fire have been fulfilled. This paper describes the sag-tension behavior of conductor under loading current normally when only partial area of a long conductor is exposed to fire. Temperatures of Overhead Conductor were different with measurement position. When the partial area of conductor was heated up to $500^{\circ}C$, 20 % of permanent tension loss was observed. This results in the increase of sag of 1.5 m when span is 300 m. The other results will be presented in the text.
산불에 노출된 가공송전선의 기계적 및 전기적 특성 거동
김병걸,장용호,김상수,한세원,Kim, Byung-Geol,Jang, Young-Ho,Kim, Shang-Shu,Han, Se-Won 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.11
Forest Fire can cause a serious damage to overhead conductors. Therefore, the detailed investigation for the changes of mechanical and electrical properties of damaged conductors should be carried out to understand the effect of forest fires on conductors. This is very much important to maintain transmission line safely. Especially, this paper describes the changes of mechanical and electrical properties of flame exposed conductor. Overhead conductors temperature were almostly 55$\sim$65% of ambient temperature. Tensile Strength decreased according to incerase of Forest Fire temperature. The detailed will be given in the text.