The current flowing through earth ground discussion reminds me of a a
solar flare storm in my home province of Quebec, Canada in the early
1990s. As many of you already know, according to Faraday's law the sum
of all the E fields times distance in a closed path( which is equal to
the sum of the voltages encountered ) is equal to the negative time
deravative of the magnetic flux accross the surface area enclosed by
the closed path. The transmission lines between the main hydro dam
generators and the population spanned a few thousand km and formed a
closed loop circuit with the ground. Since the system was all DC
coupled, a slow rising magnetic field accross this many thousand
square km surface created a high DC volage which damaged muxh of the
power grid. Since the transmissions lines had a DC voltage with
current on them too, I think it is not wrong to say that there was a
current flowing through the earth ground.
Frank
