III. PSCAD/EMTDC SIMULATION RESULTS
Three cable models (-circuit, Bergerons travelling wave
model and frequency dependent model) are compared, in order
to know how accurate they are and in which cases they are
valid [9]. With a sharp voltage variation like a step or a
pulse, most of the frequencies of the spectrum can be excited.
Thus, it is possible to compare the results and determine if
the frequency of the responses are similar or not. For the
simulation scenario, an AC voltage step is suddenly applied
to the cable. To carry out this analysis, the breaker is closed
in the worst case, when the AC voltage has its maximum value.