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500[kV] 송전철탑 접지설계를 위한 다층토양구조의 균일매질 등가화에 관한 연구
최종기,이성두,이동일,정길조,김경철,Choi, Jong-Kee,Lee, Sung-Doo,Lee, Dong-Il,Jung, Gil-Jo,Kim, Kyung-Chul 한국조명전기설비학회 2005 조명·전기설비학회논문지 Vol.19 No.6
접지설계에 있어서 토양의 전기적 특성은 접지극의 형상과 더불어 가장 중요한 설계요소 중 하나이며 이러한 토양의 전기적 특성은 접지극이 매설될 지역의 고유한 저항률, 즉 고유저항률(specific earth resistivity)로 대표되어 왔다. 이처럼 고유저항률에 근거한 수작업 접지설계는 복잡한 구조와 특성을 갖는 실제 토양을 균일한 매질로 등가 화하는 절차를 필요로 한다. 본 논문에서는 미얀마 500[kV] 송전철탑 수작업 접지설계를 위하여 수평다층토양을 균일 매질로 등가화 하는 절차를 제시하였다. The electrical characterstic of earth is the most dominant factor for grounding design and an earth is typically represented by a uniform medium with the specific earth resistivity, which is unique for a specific site. For a hand-working grounding design using a specific earth resistivity requires a process converting a real earth of complex medium into a simple uniform medium In this paper, we suggest a procedure to convert a multi-layered earth s into a simpler uniform earth for grounding design of Myanmar 500[kV] transmission towers.
대규모 접지전극 망의 접지성능 평가를 위한 겉보기저항곡선의 해석에 관한 연구
최종기,유희영,이동일,정길조,김경철,Choi, Jong-Kee,Ryu, Hee-Young,Lee, Dongil,Jung, Gil-Jo,Kim, Kyung-Chul 한국조명전기설비학회 2005 조명·전기설비학회논문지 Vol.19 No.2
접지저항의 측정은 접지극의 성능을 정량적으로 평가하는 가장 일반적인 방법이며, 여러 측정방법 중 전위강하 법은 대형 접지극의 저항측정에 많이 이용되는 방법이다. 그러나 접지극의 크기에 비례하여 측정선 길이도 길어져야 하므로, 대규모 접지전각의 경우 현장여건상 충분한 길이의 측정선을 펼치기가 곤란한 경우가 있을 수 있다. 본 논문에서는 여러 개의 접지망이 상호 연결되어 대규모의 접지극 네트워크를 형성하고 있어 충분한 길이의 전위강하법 측정선을 펼치는 것이 현실적으로 어려운 경우에 전위강하법 측정결과의 해석방법을 제시한다. 사례연구로서 상부댐 접지극과 약 2(km) 떨어져 있는 스위치야드 접지극이 상호 연결된 대형 접지극망에서 전위강하법 측정곡선 및 해석사례를 기술하였다. Measuring ground resistance is a typical way of performance evaluation of a grounding electrode. Among various ground resistance measurement methods, FOP (Fall-Of-Potential) method has been widely used, especially in case of a relatively large grounding electrode such as a substation grounding mesh grid Since FOP measurement line has to be increased as the size of grounding electrode increases, however, it is often that securing long enough FOP-line is practically impossible. In this paper, a sophisticated interpretation method of FOP measurement ma which is applicable to large grounding electrode networks, is presented.
송전철탑 부근의 대지전위 억제를 위한 이격거리 산정모델 연구
崔鍾基(Jong-kee Choi),趙?九(Hwan-gu Cho),金太榮(Tai-young Kim),李東一(Dong-il Lee) 대한전기학회 2008 전기학회논문지 Vol.57 No.2
In case of a line-to-ground fault at transmission lines, a portion of fault current will flow into the earth through the footings of the faulted tower causing electrical potential rise nearby the faulted tower footings. In this situation, any buried pipelines or structures nearby the faulted tower can be exposed to the electrical stress by earth potential rise. Although many research works has been conducted on tills phenomena, there has been no clear answer of the required separation distance between tower footings and neary buried pipeline because of its dependancy on the soil electrical charactersics of the concerned area and the faulted system. In this paper, an analytical formula to calculate the requried sepeartion distance from the faulted tower has been derived.
가공송전선 지락시 고장전류의 접지분류계수 산정에 관한 연구
崔鍾基(Jong-Kee Chi),李源敎(Won-Kyo Lee),崔仁赫(In-Hyuk Choi),李相潤(Sang-Yun Lee),黃甲喆(Kab Cheol Hwang) 대한전기학회 2008 전기학회논문지 Vol.57 No.11
In case of a line-to-ground fault at transmission lines, a portion of fault current will flow into the earth through the footings of the faulted tower causing electrical potential rise nearby the faulted tower footings. In this situation, any buried pipelines or structures nearby the faulted tower can be exposed to the electrical stress by earth potential rise. Although many research works has been conducted on this phenomena, there has been no clear answer of the required separation distance between tower footings and neary buried pipeline because of its dependancy on the soil electrical charactersics of the concerned area and the faulted system.
지중 송전선로 대칭분 임피던스 해석을 위한 EMTP 전후처리기 개발과 활용
최종기(Jong-Kee Choi),장병태(Byung-Tae Jang),안용호(Yong-Ho An),최상규(Sang-Kyu Choi),이명희(Myoung-Hee Lee) 대한전기학회 2014 전기학회논문지 Vol.63 No.10
Power system fault analysis has been based on symmetrical component method, which describes power system elements by positive, negative and zero sequence impedance. Obtaining accurate line impedances as possible are very important for estimating fault current magnitude and setting distance relay accurately. Especially, accurate calculation of zero sequence impedance is important because most of transmission line faults are line-to-ground faults, not balanced three-phase fault. Since KEPCO has started measuring of transmission line imepdance at 2005, it has been revealed that the measured and calculated line impedances are well agreed within reasonable accuracy. In case of underground transmission lines, however, large discrepancies in zero sequence impedance were observed occasionally. Since zero sequence impedance is an important input data for distance relay to locate faulted point correctly, it is urgently required to analyze, detect and consider countermeasures to the source of these discrepancies. In this paper, development of pre/post processor to ATP (Alternative Transient Program) version of EMTP (Electro-Magnetic Transient Program) for sequence impedance calculation was described. With the developed processor ATP-cable, effects of ground resistance and ECC (Earth Continuity Conductor) on sequence impedance were analyzed.
崔鍾基(Jong-kee Choi),姜鍊旭(Yeon-wook Kang),李東一(Dong-il Lee),沈應輔(Eung-bo Shim),金慶哲(Kyung-chul Kim) 대한전기학회 2006 전기학회논문지A Vol.55 No.5
Tower footing resistance and fault current division factor are important design factors for evaluation of the lightning performance of the transmission line and/or design of the grounding electrode system. The periodic measurement of those factors are also important to verify that the grounding performance of the towers has been maintained good. However, the direct measurement of those factors in operating or energized condition is very difficult because of many practical reasons, such as the difficulty of disconnecting overhead groundwires from the tower under test.. With supports by GECOL (General Electricitiy Company of Libya), we had a special chance to conduct Fall-Of-Potential (FOP) test on the energized 220 ㎸ transmission towers before and after disconnecting the overhead groundwires from the towers under test. In this paper, the FOP test results on the towers and the fault current division factors estimated from the comparision of the FOP tests with and without overhead ground wires were presented. The computer models for the FOP test simulations were also constructed to find that the simulated results agreed very well with the measured ones.