Thermal: conductor temperature vs. current at the live weather

IEEE 738 steady heat balance for ACSR Drake (28.14 mm, R_ac 0.0721 / 0.0863 Ω/km at 25 / 75 °C, emissivity and absorptivity 0.8) with the weather station's air temperature, 10-minute wind and irradiance. Where the curve crosses 75 °C is today's dynamic line rating. Dot: measured conductor temperature at the measured current.

IEEE 738 at the live weatherStatic rating weather (40 °C, 0.61 m/s, 1000 W/m²)Measured (trail)

Dynamic line rating over the day vs. the static rating

Rating at 75 °C recomputed every reading from the weather, against the line current and the fixed seasonal rating. Wind is worth more than anything else: the dynamic rating is above the static one for most of the day. Plant hours (the demo runs ×30).

Dynamic rating 75 °CEmergency 100 °CCurrentStatic rating

Line 901, span 14-15

Substation to substation, the monitored span with its line monitor, joint monitor, LiDAR clearance and the weather station, with live values. Red = beyond the twin's alarm limit.

Condition sensors

Bars against the alarm limits in the twin file (red line).

Twin health: expected vs. actual

Measured vs. expected