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Re: Ground strike currents and time...
Original poster: Paul Nicholson <paul@xxxxxxxxxxxxxxxxxxx>
> That puts the current pulse in the range of 10 - 20 nS and the
> current in the 1000 to 2000 amp range!! For a 108kV 3.7 inch
> spark off a 31.1pF toroid
That's a very nice recording of the discharge. Notice how it
decays away and then comes back a little after 100nS or so.
It's like there's a little echo at about 550nS - a reflection
from something 50 - 80 metres away? Seems you might have made a
TDR to send pulses into the ground system. The 'echo', if it is
one, is not inverted, thus indicating a bit of an open circuit
at the discharge frequency.