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자료유형
학술저널
저자정보
김점식 (대원전기) 김도영 (대원전기) 박용범 (대원전기) 권신원 (대원전기) 길경석 (한국해양대학교)
저널정보
대한전기학회 전기학회논문지 P 전기학회논문지 제59P권 제4호
발행연도
2010.12
수록면
434 - 439 (6page)

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This study fabricated a simulation facility which reduced the structure of a current distribution line to 50:1 in order to analyze the induced lightning shielding effect of a 22.9㎸-Y distribution line according to ground resistance capacity, grounding locations, etc. When installing an overhead ground wire, the standard for grounding a distribution line with a current of 22.9㎸-Y requires that ground resistance in common use with the neutral line be maintained less than 50Ωevery 200m span. The reduced line for simulation had 7 electric poles and induced lightning was applied to the ground plane 2m apart from the line in a direction perpendicular to it using an impulse generator. If induced voltage occurred in the line and induced current flowed through the line due to the applied current, the induced voltage and current of the ‘A’ phase were measured respectively using an oscilloscope. When all 7 electric poles were grounded with a ground resistance of less than 50Ω respectively, the combined resistance of the line was 7.4Ω. When an average current of 230A was applied, the average induced voltage and current measured were 1,052V and 13.8A, respectively. Under the same conditions, when the number of grounding locations was reduced, the combined resistance as well as induced voltage and current showed a tendency to increase. When all 7 electric poles were grounded with a ground resistance of less than 100Ω, the combined resistance of the line was 14.9Ω. When an average current of 236A was applied, the average induced voltage and current of the ‘A’phase calculated were 1,068V and 15.6A, respectively. That is, in this case, only the combined resistance was greater than when all 7 electrical poles were grounded, and the induced voltage and current were reduced. Therefore, it is thought that even though ground resistance is slightly higher under a construction environment with the same conditions, it is advantageous to ground all electric poles to ensure system safety.

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Abstract
1. 서론
2. 현행 배전선로의 운영기준
3. 축소 모의된 배전선로
4. 결과 및 고찰
5. 결론
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UCI(KEPA) : I410-ECN-0101-2012-560-003929519