Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

SIL

See surge impedance loading
surge impedance loading (SIL)
of a transmission line, the characteristic impedance with resistance set to zero (resistance is assumed small compared to reactance). The power that flows in a lossless transmission line terminated in a resistive load equal to the line's surge impedance is denoted as the surge impedance loading of the line.