• Title/Summary/Keyword: electric conductor

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Change of Properties by Environment Conditions in Aged ACSR Overhead Conductor (환경적 요인에 의한 노후 가공송전선의 특성변화)

  • Kim Shang-Shu;Kim Byung-Geol;Jang Tae-In;Kang Ji-Won;Lee Dong-Il;Min Byung-Uk
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.19 no.3
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    • pp.287-291
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    • 2006
  • 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.

Personnel Safety Related to Disconnection of PEN Conductor in TN-C-S System (TN-C-S계통에서 PEN도체 단선이 인체안전에 미치는 영향)

  • Kim, Jung-Cheol;Lee, Kyu-Sun;Lee, Bok-Hee
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.26 no.5
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    • pp.58-64
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    • 2012
  • In electric power supply systems, an earthing system determines the electric potential of the conductors related to that of the Earth's surface. The choice of earthing system has implications for the safety of the power supply systems. There are considerably different regulations for earthing (grounding) systems in each country. A protective earth(PE) conductor ensures that all exposed conductive surfaces are at the same electric potential as the earth surface. This paper deals with that when PEN conductor of TN-C-S system is disconnected, dangerous touch voltage causes personnel body to be harmed and human being's property to be damaged seriously. For this reason, this paper explains how serious problems can occur when the fault current flows. As a consequence, we can understand how we can design earthing system properly to ensure the personnel safety against earth faults. The result shows the way that TN-C-S system can be applied safely in Korea.

A Novel Fault Location Scheme on Korean Electric Railway System Using the 9-Conductor Representation

  • Lee, Chang-Mu;Lee, Han-Sang;Yoon, Dong-Hee;Lee, Han-Min;Song, Ji-Young;Jang, Gil-Soo;Han, Byung-Moon
    • Journal of Electrical Engineering and Technology
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    • v.5 no.2
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    • pp.220-227
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    • 2010
  • This paper presents a novel fault location scheme on Korean AC electric railway systems. On AC railway system, because of long distance, 40[km] or above, between two railway substations, a fault location technique is very important. Since the fault current flows through the catenary system, it must be modeled exactly to analyze the fault current magnitude and fault location. In this paper, suggesting the novel scheme of fault location, a 9-conductor modeling technique including boost wires and impedance bonds is introduced based on the characteristics of Korean AC electric railway. After obtaining a 9-conductor modeling, the railway system is constructed for computer simulation by using PSCAD/EMTDC. By case studies, we can verify superiority of a new fault location scheme and propose a powerful model for fault analysis on electric railway systems.

Analysis on Electric Field Distributions and Corona Characteristics of Special Conductor Bundles for 765kV Transmission Line (765kV 송전선로용 특수 다중도체 방식의 코로나 잡음특성 및 전계분포 해석)

  • Min, Seok-Won;Kim, Yong-Jun;Sin, Gu-Yong;Lee, Dong-Il;Ju, Mun-No;Yang, Gwang-Ho
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.50 no.12
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    • pp.556-560
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    • 2001
  • To solve aeolian noise, we have tried several special conductor bundles equipped with spiral rod and one kind of low aeolian noise conductor with a special shape. Charge simulation method was applied to analyze electric field distributions of them in transmission line and corona cage for investigating the corona characteristics. This paper describes the electric field distributions and the performances of audible noise and radio interference from the special bundles in 765 kV transmission line by using corona characteristics obtained from corona cage simulation.

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Development of High Strength and Low Loss Overhead Conductor(II) - Electric Properties (고강도 저손실 가공송전선의 개발(II) - 전기적 특성)

  • Kim, Byung-Geol;Kim, Shang-Shu;Park, Joo-Hwan
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.18 no.12
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    • pp.1159-1165
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    • 2005
  • New conductor is developed by using high strength nonmagnetic steel(NM) wire as the core of overhead conductor This conductor is called ACNR overhead conductor(Aluminum Conductor Nonmagnetic Steel Reinforced). Formed by the combination of aluminum alloy wire and high strength nonmagnetic steel wire, it has about the same weight and diameter as conventional ACSR overhead conductor. To enhance properties beneficial in an electrical and mechanical conductor during the Process of high strength nonmagnetic steel wire, we made a large number of improvements and modifications in the working process, aluminum cladded method, and other process. ACNR overhead conductor, we successfully developed, has mechanical and electrical properties as good as or even better than conventional galvanized wire. Microstructure of raw material NM wire was austenite and then deformed martensite after drawing process. Strength at room temperature is about $180kgf/mm^2\~200kgf/mm^2$. The conductivity at 0.78 mm thickness of Aluminum cladded M wire is about $7\%$ IACS higher than $20\%$IACS of HC wire used as core of commercial ACSR overhead conductor. The corrosion resistance is about 3 times higher than that of HC wire.

Fabrication and Test of a Superconducting Coil for SMES (SMES용 초전도코일 제작 및 특성)

  • 김해종;성기철;조전욱;배준한;김석환;심기덕;이언용;권영길;류경우
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.52 no.11
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    • pp.557-562
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    • 2003
  • To develop a stable and compact small-sized superconducting magnetic energy storage (SMES) system, which provides electric power with high quality to sensitive electric loads, we fabricated a SMES coil and tested it. Because such a large-sized superconducting coil quenches far away from its critical current, the recovery current is frequently used as a stability criterion in the coil fabrication. Therefore, we first investigated the recovery current characteristics of the large current conductor, which was used in our SMES coil fabrication. The test results indicate that the recovery currents measured in the conductor are nearly identical to those based on the single wire. This implies that the recovery current is affected by the conductor's cooling condition rather than its size and current capacity. In the SMES coil test the first quench occurred at 1250 A, which is equivalent to the stored energy of about 2 MJ. It corresponds to the quench current density of about $130A/mm^2$ This value is much higher in comparison with that reported in the other work. In addition, the first quench current of the coil agrees well with the measured recovery current of the conductor having similar cooling condition with it. This means that to determine the recovery current of a conductor is, first of all, important in the design and fabrication of a large-sized superconducting coil.

Hazards and Solutions of Loss of the PEN Conductor in TN-C-S System (TN-C-S계통에서 PEN도체의 단선고장의 위험성 및 보호대책)

  • Lee, Bok-Hee;Lee, Kyu-Sun;Ahn, Chang-Hwan;Kim, Han-Su
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.21 no.8
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    • pp.113-120
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    • 2007
  • This paper presents the electric shock hazards and solutions of loss of the combined protective and neutral (PEN) conductor in TN-C-S system. In order to mitigate the touch voltage on exposed-conductive-parts in a break in the PEN conductor, the touch voltages on exposed-conductive-parts in a break in the PEN conductor were experimentally investigated as a function of the ground resistances of the source grounding electrode and customer's additional grounding electrode. As a result, the equipotential bonding is one of important requirements for installations supplied by TN-C-S system. A solution of mitigating the touch voltages on exposed-conductor-parts caused by a loss of the PEN conductor would be the installation of the additional grounding electrode at the customer's service entrance. The ground resistance of additional grounding electrode necessary to limit the touch voltage to a safety voltage of less than 50[V] depends on the load and circuit parameters. In addition, the undervoltage sensing devices oner affordable solutions to detect a loss of the PEN conductor in TN-C-S system.

A Study for Fault Location Scheme Using the 9-Conductor Modeling of Korean Electric Railway System (9도체 전기철도 모델링을 이용한 고장점 표정 방안 연구)

  • Lee, Han-Sang;Lee, Chang-Mu;Lee, Han-Min;Jang, Gil-Soo;Chang, Sang-Hoon
    • Proceedings of the KIEE Conference
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    • 2006.11a
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    • pp.411-413
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    • 2006
  • This paper presents a novel fault location scheme on Korean AC electric railway systems. On AC railway system, because there is a long distance, 40 km or longer, between two railway substations, a fault location technique is very important. Since the fault current flows through the catenary system, the catenary system must be modeled exactly to analyze fault current magnitude and fault location. In this paper, before suggestion for the novel scheme of fault location, a 9-conductor modeling technique that includes boost wires and impedance bonds is introduced, based on the characteristics of Korean AC electric railway. After obtaining a 9-conductor modeling, the railway system is constructed for computer simulation by using PSCAD/EMTDC. By case studies, we can verify superiority of a new fault location scheme and suggest a powerful model for fault analysis on electric railway systems.

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3-Dimensional Analysis on Electric Field of Special Conductor Bundle for Reducing Aeolian Noise (풍소음 저감용 특수 다중도체 방식의 3차원 전계해석)

  • Min, Suk-Won;Song, Ki-Hyun
    • Proceedings of the KIEE Conference
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    • 2001.05a
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    • pp.254-258
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    • 2001
  • In this paper, 3-dimensional charge simulation method was developed to analyze electric field distributions of special conductor bundles equipped with spiral rods for reducing aeolian noise. When we applied this method to 765 kV double circuit transmission line, we found calculation error of this method was within a reasonable boundary of 1%.

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3-Dimensional Analysis on Electric Field of Special Conductor Bundle for Reducing Aeolian Noise In Corona Cage (코로나 케이지 내부에서의 풍소음 저감용 특수 다중도체 방식의 3차원 전계분포해석)

  • Min, Suk-Won;Song, Ki-Hyun
    • Proceedings of the KIEE Conference
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    • 2001.07a
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    • pp.359-361
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    • 2001
  • In this paper, 3-dimensional charge simulation method was applied to analyze electric field distributions of special conductor bundles equipped with spiral rods for reducing aeolian noise in a corona cage. We found calculation error of this method was w a reasonable boundary of 0.5%.

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