Abstract
Low-sag conductors are characterised by their ability to operate above the “knee-point temperature” (KPT). Sag-tension performance must be calculated while designing a new overhead line. The ampacity limit of the conductor is influenced by the sag and the temperature of the conductor. The maximum sag must be limited to a certain value to ensure a safe clearance between the conductor and ground. In this study, a gap-type conductor in operation was monitored to evaluate the actual KPT. The KPT in low-sag conductors is a crucial factor since it affects the sag of the conductor, which must be limited for safety reasons. The KPT was detected based on the change in the coefficient of thermal expansion value of the conductor. To perform this detection, the conductor tension and temperature were monitored. This study proposes a procedure to estimate the coefficient of thermal expansion (CTE) value. The results showed a gradual displacement in CTE. This procedure was used to perform measurements in a pilot line.
Highlights
The demand for electricity has grown exponentially in recent times
Replacing the existing conductors with high-temperature low-sag (HTLS) conductors presents a safe and secure way to increase the power flow in the line without the need to strengthen the towers [1, 12, 13]. These conductors operate at higher temperatures than that those required for conventional conductors, and their coefficients of thermal expansion (CTEs) are lower than those of conventional conductors
The KPT detection is based on the change in the conductor CTE values
Summary
The demand for electricity has grown exponentially in recent times. This demand is set to increase with the integration of electric vehicles and the development of newer technologies that require electricity for their operation. Replacing the existing conductors with high-temperature low-sag (HTLS) conductors presents a safe and secure way to increase the power flow in the line without the need to strengthen the towers [1, 12, 13]. These conductors operate at higher temperatures than that those required for conventional conductors, and their coefficients of thermal expansion (CTEs) are lower than those of conventional conductors. We explain a case in which DLR monitoring systems are used to evaluate the low sag-tension performance of a GTACSR HTLS conductor in a line in operation.
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