• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.609-611
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• 2005

In this study electromagnetic wave fields under power lines arc derived by dipole antenna theory and electromagnetic fields under 3 phase power lines with horizontal and vertical configuration are formulated. The calculation results by those formulas were consistent with the results of reference. The formulas were applied to 345[kV] and 765[kV] transmission lines constructed in our country.

• Proceedings of the KIEE Conference
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• 1996.07c
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• pp.1923-1924
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• 1996

Some part of the route in KEPCO 765kV transmission line being constructed passes through a high mountain area which is 800m above the sea level (Taebaek, Sabuk area in Gangwon province). This area is the top part of Taebaek mountains corresponding to the backbone of korean peninsula and has lots of snow during the winter season because the winter seasonal wind gone up along the mountainside of Taebaek Mts. meets open air of the East sea. KEPCO has experienced 63 faults of T/L between 1968 and 1993 in this area, which is a very serious problem. Especially 154kV Hwang-Ji T/L fault in 1990, 2 was a unprecedented case which needs to be analyzed carefully to take proper measures. After reviewing ice and snow loading conditions and analyzing the fault of Hwang-Ji T/L, we're going to determine the revisement of ice and snow loading condition in this area to increase reliability of 765kV transmission line.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.45 no.2
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• pp.301-309
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• 1996

This paper estimates the electric field effect near 765[kV] AC double transmission line with numerical data. The induced voltage and current of a human and car under who kinds of phase arrangement are calculated when each of two objects is insulated or grounded. When the calculated results of the low-reactance and superposition phase arrangement are compared, it is proved that the induced voltage and current of the former are about 30 [%] smaller than that of the latter. The induced current of a human and car are less than 0.5[mA] which is about 10[%] less than that of the American National Standard Code. Also the induced voltage and current of dead lines by other live lines are calculated. Finally the effective number and position of shield wires to reduce the field in ground level are considered. charge simulation method and surface charge method are used to simulate the 2 or 3 dimensional transmission line model respectively.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.2209_2210
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• 2009

송전계통에서 가장 많이 발생하는 고장은 일시고장이며, 이 중 70%~80%가 아크지락 고장이다. 일시 고장시 계통의 빠른 복구를 위한 성공적인 재폐로를 이루기 위해서는 2차아크의 재점호와 소멸시간이 중요한 변수로 작용한다. 따라서 이러한 2차아크의 특성을 분석하고 적절한 소호시점을 알아내는 것이 성공적으로 고장 후 계통을 복구시키기 위해 필요하다. 본 논문에서는 전력 계통의 과도현상 분석 프로그램인 EMTP(Electro Magnetic Transient Program)를 이용하여 765kV 송전계통에서 아크 지락 고장을 시뮬레이션 하고, 송전선로내 고장지점을 다양하게 변화시켜 가며 아크 전압 특성을 분석하였다.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.2231_2232
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• 2009

기술의 발전과 고도의 산업화로 인해 전력소비자들이 이전에 비해 더욱 고품질의 전력공급을 원하게 되었고 이에 부합하여 전력공급 신뢰도 향상과 전력품질이 현재 중요한 연구과제로 대두되어 왔다. 계통의 특성에 따라 다르지만, 대략 송전 계통에서 발생하는 전체 고장 의 75~90%는 일시고장이고 이러한 일시고장을 제거하기 위한 재폐로 과정을 수행시 계통의 신뢰도 및 안정도 향상을 위하여 적응적으로 무전압 시간을 조절하는 것이 필요하다. 본 논문에서는 아크고장에 따른 무전압시간을 최소화시켜주는 HSGS(High Speed Grounding Switches)의 기능에 대해서 검토하고, EMTP로 모델링된 765kV 송전계통에 일시 고장을 발생시켜 HSGS의 투입여부에 따른, 1선 및 2선 지락사고에서의 2차아크 소호특성을 분석하였다.

• Proceedings of the KIEE Conference
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• 2000.07a
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• pp.131-133
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• 2000

Single phase simulations were carried out in order to determine a solutive conductor to the aeolian noise which will be locally applied to 765 kV transmission lines Basic solutive conductors have already been proposed including conductors equipped with spiral rod. low noise conductor of a special shape and others. A low aeolian noise conductor, however, should have excellent corona characteristics in addition to aeolian noise reduction function. In this paper, we compared the performances of the audible noises and radio interferences of 6 candidate conductor bundles by using corona cage. We also developed two programs to need for evaluating environmental effects of each conductor bundle. Those are a program to calculate the conductor surface gradient of various special bundles and a conversion program of single phase data to the model of transmission line. The future determination on the final low aeolian noise conductor will be made through a long-term test to verify environmental impacts at the full-scale Kochang 765 kV test line.

• The Journal of the Korea institute of electronic communication sciences
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• v.17 no.3
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• pp.459-466
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• 2022

Switching surges are a common type of phenomenon that occur on any sort of power system network. These are more pronounced on long transmission lines and in high voltage converter stations. At AC/DC hybrid transmission lines, the insulation coordination of such lines is mainly dictated by the peak level of switching surges, the most dangerous of which include three phase line energization and AC/DC converter station. The power system structure consist of AC/DC hybrid transmission lines which is combination of AC 765kV and ±500kV HVDC 1 bipole system for contingency analysis. The power system under study and its components are simulated using EMTDC software package, the effects of the various AC/DC mixing power lines are reviewed. The developed models of EMTDC conversion lines based on combination of AC/DC system are simulated and the characteristics of switching surge over-voltage from its results are discussed.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.52 no.1
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• pp.50-57
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• 2003

In this paper, the protective relay setting rules of Korean electric power system are studied by analysis of errors to be considered. An accurate operation of protective relays with accurate settings are important in power system reliability. The setting rules are used from the first establishment in 1982 and revision in 1990 Therefore, it needs revise and analysis of the setting rules because of environmental changes such as voltage raise or applied new technology of power system. Two major setting rules are studied. One is the rule for Zones of distance relay for transmission lines. The other is the one of differential current in a differential relay for power transformers. The range of errors in the setting rules accepted in the field experience is studied in simulation of case study. Also some guide lines for the range of errors in the setting rules are presented from the case study using Matlab simulation.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.9 no.6
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• pp.802-812
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• 1998

Safety related to electric field exposure for the personnel of high voltage power plant and substation is of importance. To analyze the induced current influencing on human body in this paper, we calculate directly capacitance in three dimension which is complex and time consuming, as not to separate the voltage source and the induced object using a effective modeling technique. The proposed algorithm in this paper has been applied to 765 kV high voltage transmission line to evaluate human hazard for the induced current through the case study. As the results, the short circuit current of human body has been identified in the range of 0.3 mA to 6.8 mA. Closing to transmission line, this range of short current can exceed 5 mA that ANSI recommended let-go current. Therefore, it is necessary to countermeasure such as putting on conductive clothing in live-line maintenance of transmission line.

• Proceedings of the KIEE Conference
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• 1997.07e
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• pp.1804-1806
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• 1997

Route conditions, applied voltage and the condition of stringing conductors should be considered in determining standard types and skeleton diagrams of towers. In skeleton diagrams the necessary number of insulators and the air clearance have been decided by the results of studies on insulation coordination. Galloping, sleet-jumping, sag characteristics and the possibility of closeness of conductors should be considered according to the condition of stringing conductor and the span. After reviewing those factors, it is necessary to determine the minimum vertical and horizontal distance for the safety of transmission lines under any circumstances. Also it should be economical.