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Registered Member #2566
Joined: Wed Dec 23 2009, 05:52PM
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Posts: 147
Ordinary magnifier configuration. Consider situation when sparks from the top of extra coil strike "transmission line" . Question : How can air gap ,between secondary and primary coil, withstand involved HV spikes?
Drawing:
The situation isn't rare during magnifier runs but I don't remember anyone has ever reported observing problem of this kind.
Registered Member #2566
Joined: Wed Dec 23 2009, 05:52PM
Location:
Posts: 147
Coronafix wrote ...
As long as a good ground is present, the spark will want to travel that extra distance to zero potential.
Yes,I agree. But in the case described above that extra distance (the gap between top of primary and top of secondary) remains unbroken by spark.And that's the puzzle :)
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I would say it depends on the voltages and capacitances... If the secondary topload+transmission line have a relatively high capacitance, the voltage pulse would not be so high.
Registered Member #2566
Joined: Wed Dec 23 2009, 05:52PM
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Posts: 147
Well,who knows.But I doubt.Never heard/read someone complaining regarding the problem. Problem of isolation ( breakdown ) between primary and secondary is reportedly present only during the phase of energy transfer from primary to HV circuit(s).Strange that these voltages are higher than these caused by a long spark direct strike. Tertiary toploads can be comparatively very big :
Registered Member #2566
Joined: Wed Dec 23 2009, 05:52PM
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Posts: 147
I guess HV spikes are much smaller than expected due to other reasons. For example,consider spark from a big DRSSTC striking a smaller coil (5-6x smaller) , or striking just small electrode on short insulator support :
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Spark strikes
