Methodology for applying real-time ratings to wood pole supported overhead lines

The current-carrying capacity of overhead lines is dependent on weather conditions. Overhead lines can safely carry more than their rated capacity during periods of low ambient temperature or high wind speeds due to cooling effects. Dynamic line rating involves quantifying this additional capacity in real time as local weather conditions change. Increases in line rating due to high wind speeds are anticipated to coincide with moments when increased capacity is required due to wind generation. This paper provides details on the monitoring equipment used and the various rating algorithms and issues with determining the current-limiting section of the line. Building upon earlier work [1], this paper describes the learning gained using the monitoring system and suggests areas of improvement. Preliminary results and an assessment of the increase in capacity provided by dynamic line rating are presented.