Significance of the Conductor Radial Temperature Gradient within a Dynamic Line Rating Methodology

Transient and steady-state overhead conductor radial temperature differences were monitored indoors under controlled wind conditions and outdoors in a real-world setting with the intent of establishing the significance of the radial temperature gradient within a dynamic thermal line rating methodology. The study validates steady-state and transient conductor temperature difference expressions developed by General Electric and utilized within DOLMIRS (a dynamic thermal line rating software package developed for NMPC and ESEERCO of New York State). The study substantiates the relative importance of the conductor temperature gradient especially when meteorological factors such as wind or ambient air temperature become more favorable toward higher dynamic ratings.