In a message dated 11/22/2007 11:47:26 A.M. US Eastern Standard Time,
list@xxxxxxxxxxxxxxxxxxxxxxxxx writes:
I am also trying to work out, that other than coupling and frequency
which
effect the tank "transfer speed" to secondary... can the secondary itself
become "easier to drive" to make the transfer quicker ? this is why I
thought that a lower inductance would take less time to "charge" and the
energy transfer would be quicker than a lower inductance.... though this
could just be down to a higher frequency...
cheers,
Chris
Chris,
I'll ignore the arc-to-ground case which is a special case. Most
folks like to see mostly air streamers I think. The transfer speed to
the
secondary is not the problem preventing fast quenching. The real problem
is streamer (actually leader) impedance. If the streamers were somehow
of a lower impedance, this would drain the energy faster from the
secondary.
Low impedance results in a heavier loading effect by the streamers.
If the streamers were of low enough impedance, then there would be no
energy left to go back into the primary and prevent quenching. The
effect
of streamer loading reflects back through the system to affect the quench
time. In the case of the arc-to-ground, the streamer impedance becomes
very low, and drains the energy quickly. If the energy transfers to the
secondary quickly, but can't
get out quickly via the streamers, then there's a bottle-neck, a traffic
jam. It's as if many cars are streaming onto a highway from various
feeder roads, but up ahead a couple of lanes are shut down for repair.
Now the traffic backs up. If the cars speed quickly to that bottle-neck,
it won't do them a lick of good. They'll still have to slow down or stop
until the traffic ahead makes its way through the constriction. Souping
up the engines of the cars, or reducing the friction of the car's
powertrain, etc. won't help. The only thing that will help is to
remove the constriction, to open the lanes of the highway which are
closed for repair. This opening of the lanes, would be analogous to
reducing the impedance of the streamers of the TC.
John
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