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강연욱(Yeon-Woog Kang),심응보(Eung-Bo Shim),권동진(Dong-Jin Kweon),곽주식(Ju-Sik Kwak) 한국조명·전기설비학회 2008 조명·전기설비학회논문지 Vol.22 No.10
송전선로에 발생하는 정전은 산업계에 큰 영향을 미치고 있다. 특히 낙뢰에 의한 송전선로의 사고는 50[%]를 넘고 있다. 송전선로에 발생하는 낙뢰에 의한 정전을 줄이기 위해서는 경제적인 관점을 고려하여 보강대책을 수립하는 것이 중요하다. 송전선로의 신뢰도는 보통 연간 100[㎞]당 몇 건의 낙뢰에 의한 사고가 발생하는가에 의해 결정되므로, 낙뢰에 대한 보호 대책을 수립하기 위해서는 뇌 사고율을 정확하게 예측하는 것이 필요하다. 낙뢰에 의한 절연물의 섬락현상은 대단히 복잡한 전기자기적 현상이다. 또한 송전선로의 뇌 사고율을 계산하기 위해서는 수많은 반복계산이 요구된다. 따라서 프로그램의 개발이 요구되며, 본 논문에서는 송전선로 뇌 사고율 계산을 위한 기본 개념 및 개발된 프로그램을 검증하였다. The outages of transmission lines give big damages to the industrial world Lightning outages occupy above 50[%] among the outages of transmission lines. To decrease the lightning outage rates, it is necessary to by countermeasures considering economical points. For the lightning protection of power transmission lines, it is very important to accurately predict the lightning outage rate because the reliability criterion for transmission line is normally specified as the number of flashovers per 100[㎞] per year. The phenomenon of an insulator flashover by a lightning stroke is a very complex electromagnetic event. And to calculate the lightning outage rates of transmission lines, so many calculation should be repeated because there are many overhead lines and power lines. Therefore it is necessary to develope a program for it. In this paper, we briefly introduce the basic concept for lightning outage calculation algorithm and the program.
케이블 열회로의 전기적 등가회로 변환을 이용한 케이블 허용전류 검토 방법
강연욱(Yeon-Woog Kang),김민주(Min-Ju Kim),장태인(Tae-In Jang),박진우(Jin-Woo Park),박흥석(Hung-Sok Park),강지원(JI-Won Kang) 대한전기학회 2016 전기학회논문지 Vol.65 No.5
Current rating of a power cable can be calculated by the maximum allowable temperature in an insulating material considering the heat transfer from cable conductor. Therefore, it is very important to calculate the current rating using electrical equivalent circuit by calculated cable thermal circuit parameters but, it has not been fully investigated yet. In this paper, in order to determine the current rating of power cable, conventional calculation method has been reviewed considering the conductor resistance, loss factor of sheath, dielectric losses and thermal resistances based on the maximum allowable temperature of 345 kV 2500 ㎟ XLPE cable. To confirm the calculation result of the current rating, the conductor temperature should be examined whether it reaches the maximum allowable temperature by the thermal equivalent circuit of the cable. Then, utilizing EMTP (Electro-Magnetic Transient Program) which is a conventional program for electrical circuit, the thermal equivalent circuit was transformed to an electric equivalent circuit using an analogous relationship between thermal circuit and electrical circuit, and temperature condition including cable conductor, sheath, cable jacket could be calculated by the current rating of 345 kV 2500 ㎟ XLPE cable.
폴리머 절연암을 이용한 송전선로 전압 승압에 관한 연구
이원교,이정원,강연욱,이동일,Lee, Won-Kyo,Lee, Jung-Won,Kang, Yeon-Woog,Lee, Dong-Il 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.10
The large increase in the use of electricity has resulted in an ever-growing electric power demand. It has created the need for the construction of power transmission facility located close to the load centers and it also has to require wide right-of-way and large lots, that are not always available, for especially the installation of the towers. The difficulties in acquiring right-of-way have put pressure on energy companies to either upgrade a line on an existing right-of-way to higher voltage or build a new line on a narrow right-of-way. This paper presents the design of a compact tower with polymer Insulation arm, in order to reduce the separation between phases. the compact tower can be built on a narrow right-of-way. the compact tower can be designed based on 345 kV Tower regarding electrical clearances and right of way, therefore the conventional 154 kV Tower can be upgrading transmission line voltages have moved to 345 kV levels.