Operation and planning of a power system are constrained by the rating of power lines. Usually, the static line rating is used for system operation and planning. The static line rating defined for an electric grid uses the same conservative weather assumptions for the whole grid regardless of the location of each line or its maximum-allowable conductor temperature. A separate analysis of the weather magnitudes measured in a pilot line shows how favorable air temperature and solar heating

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... ate for unfavorable wind speed. However, this compensation is limited for high maximumallowable conductor temperatures. As a result, the risk of the static line rating exceeding this maximum temperature is higher for HTLS conductors. An adaptive static line rating is proposed to control the assumed risk. The wind speed assumption for the static rating is reduced for higher maximum-allowable conductor temperature. Index Terms-Transmission line, static line rating, ampacity, overhead line, high temperature low sag HTLS conductor, power system operation, power system expansion planning. © 2018 IEEE 2 static rating method for system operation and planning that improves the security level for higher MACTs is developed.