hashtag#Technical hashtag#Note:
High Wind Speed → Better Conductor Cooling → Higher Load Carrying Capacity
Objective (Technical Justification)
To technically prove that increase in wind speed and reduction in effective conductor temperature allows the same conductor to safely carry higher electrical current.
1) Basic Heat Balance of an Overhead Conductor
(IEEE / CIGRÉ principle)
At steady condition:
I²R + Qₛ = Qc + Qr
Where:
I = Line current
R = hashtag#Conductor resistance at operating temperature
Qₛ = Solar heat gain
Qc = Heat loss due to wind (convection)
Qr = Heat loss due to radiation
👉 For the same conductor and sun condition, only Qc (wind cooling) changes significantly with wind speed.
2) hashtag#Wind hashtag#Speed Directly Controls Conductor Cooling
Convective heat loss:
Qc = hc × (Tc − Ta)
Where:
hc = Convective hashtag#heat hashtag#transfer coefficient
Tc = Conductor temperature
Ta = Ambient temperature
And,
hc ∝ V⁰·⁶
Where V = wind speed (m/s)
👉 Higher wind speed ⇒ much higher cooling
👉 hashtag#Cooling increases non-linearly with wind
3) Effect of Wind on Conductor Temperature
For the same current:
Low wind → low cooling → conductor temperature rises
High wind → high cooling → conductor temperature drops
Practically observed:
Increasing wind from ~1 m/s to 10–11 m/s can reduce conductor temperature by 15–25°C at the same load.
4) Temperature vs Resistance Relationship
hashtag#Conductor hashtag#resistance depends on temperature:
Rₜ = R₂₀ × [1 + α (T − 20)]
Where:
α ≈ 0.004 /°C for aluminium
👉 Lower temperature ⇒ lower resistance
👉 Lower resistance ⇒ lower I²R losses
5) Why Lower Temperature Means Higher hashtag#Ampacity
Heat generated:
Heat = I² × Rₜ
If wind cooling reduces conductor temperature:
Rₜ decreases
To reach the same limiting temperature (75°C / 85°C / 95°C),
higher current is required
👉 Ampacity automatically increases
6) hashtag#Wind hashtag#Farm–Specific Engineering Logic (Key Point)
Wind Generation Line Cooling Thermal Risk
Low Low Low Low
High High High Controlled
✔ When hashtag#wind is low → power is low → current is low
✔ When wind is high → power is high → cooling is also high
👉 Load increase and cooling increase together
This makes wind-farm evacuation lines naturally thermally balanced and safe.
7) Practical Example – AL-59 Panther (33 kV)
Nominal rating (≈ 0.6 m/s wind): ~650 A
Wind 3–4 m/s: ~900–1000 A
Wind 10–11 m/s: ~1200–1300 A
👉 80–100% increase in ampacity purely due to wind-induced cooling
👉 Conductor remains within thermal limits
8) Final Technical Conclusion
Increase in wind speed increases convective heat loss, reduces conductor temperature, lowers resistance, and therefore allows the conductor to carry higher current safely.
This is a first-principle thermodynamic and electrical fact, validated by hashtag#IEEE-738, hashtag#CIGRÉ, and consistently observed in wind farm transmission systems worldwide.
hashtag#PowerTransmission
hashtag#WindEnergy
hashtag#WindFarm
hashtag#Ampacity
hashtag#OverheadLines
hashtag#ThermalRating
hashtag#WindIntegration
hashtag#ElectricalEngineering
hashtag#TransmissionLines