Corona Suitability Calculator (IEEE 605:2008)
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Line Geometry & Voltage
Line-to-Line Voltage V
LL
[kV]
e.g., 400 kV (V₁ uses ×1.1·VLL/√3)
Frequency f (Hz):
Phase Spacing D [cm]
Center-to-center between phases
Conductor Height Above Ground h [cm]
Conductor & Bundle
Conductor Diameter d [cm]
r = d/2 = 1.835 cm for 3.67 cm
Bundled Conductor?
No (single)
Yes (bundle)
Number of Subconductors n
1
2 (Twin)
3 (Triple)
4 (Quad)
g auto: 1.0 for n≤3; 1.12 for n=4
Subconductor Spacing S [cm]
Corona Inception Parameters
Surface Irregularity Factor m
1.00 – Polished/new
0.95 – Slightly rough
0.85 – Aged ACSR
0.70 – Rough/dirty
Relative Air Density δ
Constant E
0
[kV/cm, rms]
Constant C [cm⁻¹]
Method for E
c
Peek (√ form): E₀·m·Dₐ·(1 + C/√(r_c·Dₐ)) Ref.IEEE 605 - D.1
Linear (r·Dₐ form): E₀·m·Dₐ·(1 + C/(r_c·Dₐ))
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