Re: Capacitor Help

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Terry,

LTR caps wont prevent the high voltages that can damage the NST if 
the spark gap is opened up too much.  Yes, LTR keeps the steady state 
response reasonable but the transient response will beat with the 
steady state response and allow the voltage to get fairly high (not 
as bad as an uncontrolled resonant rise).  Ive done computer 
simulations that show voltages can get as high as 28KVpeak (with a 
15KV NST) with the gap opened up too much.

True if the main gap is set properly, a safety gap is probably not 
necessary but the protection is only differential mode.  A three 
terminal safety gap will also give common mode protection in case of 
a secondary to primary hit. The main advantage of a safety gap, I 
think, is you set it once and leave it alone.  You are now free to 
adjust the main gap as you like and dont need to worry about 
remembering the maximum setting to not exceed.

One persons thought
Gerry R

> Original poster: Terry Fritz <vardin@xxxxxxxxxxxxxxxxxxxxxxx>

> Just resist the temptation to increase the main gap size to get 
> larger arcs.  But LTR MMCs should fix that risk anyway...