[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [TCML] Odd VTTC Streamer Behavior
The 8kV was the AC rating for the mica cap. It's rated for 11 amps at
The coil operated at around 120kHz or so. I was getting probably
35" sparks at the time. I knew the rating was marginal, and I was
not surprised it failed. Usually I use two of these in series, but I
have the right values so I used this single capacitor. I just offered
information to give Phillip(?) an idea of what type of voltage
relationships he might expect. I wasn't presenting it
from a engineering or scientific perspective.
From: Ed Phillips <evp@xxxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Tue, 21 Oct 2008 6:07 pm
Subject: Re: [TCML] Odd VTTC Streamer Behavior
When I tried using a an 8kV rated mica transmitting cap
with a 6kVAC power supply, the transmitting cap failed.
So that may give some idea of what voltage ratios can
be withstood in a VTTC. Of course each VTTC maybe
slightly different, etc.
For the other original issue... the problems over
105 to 120V:
Another possibility is that your staccato board may be
being affected by the RF. That may be disrupting its
operation at the highest powers. Better grounding
or bypassing of the staccato power supply may help
if that's the problem. I=2
0had plenty of those problems
when I first was perfecting the staccato concept.
The 8 kV was probably a DC rating and you attempted to operate it way
above ratings for the frequency you used. Transmit micas are normally
rated for different currents at different frequencies; the product of
the rated current at a particular frequency times the reactance of the
capacitor at that frequency gives the maximum RF voltage, which is
usually much less than the rated DC voltage. The reason for the current
limit is heating due to the equivalent series resistance rather than
voltage breakdown. Normally this information is on the name plate of
Other capacitors rated for RF service usually have similar ratings
and these should be observed for maximum life.
Tesla mailing list
Tesla mailing list