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I think you mean to ask if the probe is at +/-500kV. Yes.Bassalisk said:Is it because the probe is initial at 0 potential with respect the to power line? And whole chopper is at 0 potential?
The other thing to note is that the AC potential is, well, AC. The current discharge is therefore continuous AC until they are clipped on, because the helo acts as a capacitor drawing + then - charge on each cycle of the AC on the line. Once clipped on, the helo and the guys are both bouncing up and down through 500kV AC, with respect to ground, 50 [or 60, dependent on network] times a second. That's why they have to 'probe off' as they leave the line, as well as when they come up to the line.