A temporary over voltage is an oscillatory phase to ground or phase to phase
over voltage that is relatively long duration and is undamped or only weakly
damped. Temporary over voltages usually originate from faults, sudden
charge of load, Ferranti effect, linear resonance, ferroresonance, open
conductor, induced resonance from coupled circuits and so forth. The steady
voltage at the open end of an uncompensated transmission line is always
higher than the voltage at the sending end. This phenomenon is known as the
Ferranti effect. This paper presents a study of Ferranti effect in electrical
transmission line. The study is based on both software and hardware. The
MATLAB program gives the locus of sending end voltage with line length
which shows that receiving end voltage is greater than sending end voltage.
From the experiment with transmission line simulator the values of three
phase voltages at sending end and receiving end were found which proves
the Ferranti effect.