Surge Impedance Loading Formula |
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\( SIL \;=\; V_{LL}^2 \cdot Z_s \) (Surge Impedance Loading) \( V_{LL} \;=\; \dfrac{ SIL }{ Z_s } \) \( Z_s \;=\; \dfrac{ SIL }{ V_{LL}^2 }\) |
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| Symbol | English | Metric |
| \( SIL \) = Surge Impedance Loading | \(\Omega\) | \(\Omega\) |
| \( V_{LL} \) = Line to Line Voltage | \(V\) | \(V\) |
| \( Z_s \) = Surge Impedance | \(\Omega\) | \(\Omega\) |
Surge impedance loading, abbreviated as SIL, is a concept in power transmission that represents the maximum power that a transmission line can carry without experiencing reactive power losses. It refers to the point at which the reactive power generated by the transmission line (due to its capacitance) equals the reactive power consumed by it (due to its inductance), creating a condition where the transmission line is naturally balanced, and no reactive power flows in or out of the line. SIL is used in determining the voltage stability and reactive power balance in long-distance high-voltage power transmission lines. Here's a more detailed explanation:
