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Surge Impedance Loading or SIL - Definition, Formula

Surge Impedance Loading or SIL - Definition, Formula

Surge Impedance Loading
Surge Impedance Loading or SIL - Definition, Formula

What is Surge Impedance Loading?


Surge Impedance Loading or SIL is the power demand or load supplied by the transmission line having no resistance by considering unity load power factor.

Explanation of Surge Impedance Loading or SIL


In case of transmission line surge Impedance Loading is depends on inductance and capacitance of the transmission line.

Formula of Surge Impedance Loading or SIL

Surge Impedance Loading
Formula of Surge Impedance Loading or SIL

Where, L - Inductance of transmission Line
            C - Capacitance of transmission Line 

Surge Impedance Loading is independent of the transmission line length. 

In this case I^2 X of the transmission line provides charging kVA of the transmission line.

SIL or Surge Impedance Loading can also be given as below formula:

Formula of Surge Impedance Loading or SIL

Surge Impedance Loading
Formula of Surge Impedance Loading or SIL

From SIL or Surge Impedance Loading, one can calculate power demand or load supplied by transmission line at various voltage levels.


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