Re: Primary Capacitor Protection
Sent: Tuesday, January 06, 1998 12:05 PM
Subject: Primary Capacitor Protection
I have asked a couple of times on this list for opinions on how wide I can set
the safety gap on my C.P. capacitor - and received no advice. I think folks
out there are reluctant to offer advice on this subject as they don't want to
feel responsible if I should destroy another C.P. capacitor.
I posed the question directly to Condenser Products and received a reply
yesterday. W.I. Mason, President, responded " 1/2" gap spacing equates to
approximately 38.5 KV peak voltage. To be safe and within capacitor limits, I
would make the gap 3/8" (31 KV max). The capacitor is designed for maximum of
34 KV peak including safety."
The capacitor that I have is p/n TC253-34-300 and is from the last group
purchase. With all the problems that I am currently having with my system, I
am convinced that the first two caps died from overvoltage resulting from a
resonance problem between the pole pig and the cap. I have the gap currently
set at 5/8" (which is about 67% wider than he recommends) and cannot input
full power to the system.
My plan at this stage is to reduce the gap to 1/2" and rewire the primary to
add resistance and see what happens.