간접도체 방식을 이용한 가공송전선의 동적송전용량 추정 = Dynamic Line Rating Estimation Using Indirect Conductor Method in Overhead Transmission Lines

국문 초록 (Abstract)

고가공도체의 최대허용전류인 열용량은 일반적으로 IEEE P738 기준에서 주어진 것과 같은 열평형 방정식을 기초로 계산된다. 이 정격은 기온, 풍속, 풍향 및 태양열과 같은 기상조건의 함수로 주어진다. 이러한 기상 파라미터들 중에 풍속은 그 값이 아주 작게 나타날 때 송전용량 결정에 강한 영향을 준다. 따라서 송전용량 모니터시스템에서 사용되는 풍속계 대부분은 낮은 감도와 실속 특성을 가지므로 부정확한 결과가 나타난다. 본 논문에서는 풍속계를 사용하지 않고 가공송전선의 동적송전용량을 결정하기 위한 새로운 방법을 도입한다. 풍속을 2개의 간접도체의 온도로 추정하고 실험을 통하여 추정풍속으로 구한 동적송전용량이 기상모델로 구한 결과와 매우 근접함을 밝혔다.

다국어 초록 (Multilingual Abstract)

The thermal rating of an overhead conductor, which is the maximum allowable current, is generally calculated on the basis of heat balance equation found in IEEE P738 standard. This is given as a function of the weather conditions such as air temperature, wind speed, wind direction, and sun heat. Wind speed among such weather parameters is strongly affected on determining the line rating when it appears very low level. Therefore there may occur inaccuracy since most anemometers used in line rating monitor systems may show low resolutions and stall speed performance. In this paper, we introduce a new methodology for determining the dynamic line rating in overhead transmission lines, without using my anemometer. It was shown that wind speed can be estimated by the temperatures of 2 indirect conductors, and through experimental study, the dynamic line rating obtained by the estimated wind speed was very closely that of weather model.

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