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ERT under high voltage lines

Posted: Sat Sep 08, 2018 1:15 pm
by panku44
Can anyone explain to me the dependence of the quality of ERT results under high voltage lines? sometimes records are very good, and sometimes the result is unacceptable - it does not reflect the prevailing geology.

Is this weather conditions? air humidity?

Re: ERT under high voltage lines

Posted: Thu Sep 13, 2018 11:37 am
by MrMister
Some utility poles/pylons leak line voltage down the ground wire. This messes up the apparent resistivity calculations. In my experience, about 1 in 10 poles or pylons are leaky enough to mess up resistivity measurements, but utility companies don't care about such low levels of line loss.