1 1Abstract--Dynamic thermal line rating can optimize transmission operation by capturing previously unutilized line capacity while simultaneously improving system reliability. This paper will introduce a new system for dynamically determining the thermal rating of an overhead line. The paper will focus on a case study by describing how the system was used to relieve a transmission line constraint for a wind farm in the mid-western United States. A description of the particular constraint will be presented, followed by a discussion of the installation of the dynamic rating system and the integration of the dynamic rating data into operations. Results from the first summer of operation of the system will also be presented. I. NOMENCLATUREThermal rating -the maximum current or MVA that can be transferred over a transmission line without exceeding the specified maximum operating temperature of that line.Static rating -the thermal rating of a line as determined by assumed weather conditions. A line may have multiple static ratings (e.g. summer, winter).Dynamic rating -the thermal rating of a line that is determined in real-time using actual weather conditions. Transmission line constraint -a situation where a line transfer is limited by either normal system flow or postcontingent flow (flow that would result if a failure occurred somewhere in the system) exceeding the rating of the line.

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