// multi-utility computation suite · offline · instant · precise
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eng.transmission-line-SIL Calculator
Calculates transmission line Surge Impedance Loading (SIL), characteristic impedance, and operating limits from line parameters. A line loaded at SIL produces a flat voltage profile — lines loaded above SIL experience voltage depression; below SIL experience voltage rise.
Inputs
Z0 Ohm
Total opposition to AC current — combines resistance and reactance from capacitors/inductors.
Vr Kv
Electric potential difference (V). Drives current through a circuit. Household: 120 V (US) or 230 V (EU/UK).
Length Km
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Beta Rad Per Km
Reference formula or conversion factor shown for context.
Results
surge impedance loading SIL (MW)
Total opposition to AC current (Ω), combining resistance and reactance. Z = √(R² + X²). Maximum power transfer occurs when source and load impedances match.
electrical length θ (°)
The computed linear length.
Vs/Vr ratio (no load)
The proportional relationship between two quantities.
SIL = Vr²/Z₀
Reference formula or conversion factor shown for context.
Z₀ overhead line range
The difference between the maximum and minimum values.