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Re: [TCML] first light disaster
At 09:07 PM 12/27/07 -0800, you wrote:
The cap failures may or may not have been due to the tap disconnect.
Did you notice if the caps failed before the tap issue? I expect you
simply noticed the tap, reconnected and then tried with no results and
later realized the caps had failed.
I noticed the failure completely after the fact
To be safe, describe your connections for us. If there is an obvious
blunder, someone will recognize it.
From one HV bushing on the NST: To one side of the SRSG and to
the primary inner.
From the other HV bushing on the NST: To the other side of the SRSG and to
one side of the cap bank.
From the other side of the cap bank: To the outer primary.
Also, describe the caps your using and MMC in general would be helpful.
The cap bank is comprised of 24 each .5 MFD @1500 V connected in series for
a value of .0208 MFD @ 36 KV.
The caps are oil filled "snubbers". The terminals are 1/4-20 studs. They
are bussed with copper strap, arranged
in an 8 x 3 array with a 20 Meg 15 KV "tiger stripe" across each triplet.
Also your SRSG electrode spacing would be of interest here.
The SRSG is a propeller type with two pairs of stationary electrodes and
one flying electrode @ 1800 RPM.
The gaps were approximately..015" for a total of about .030"
One thing of note here, I had the gap motor phase shifted "all the way" on
one occasion and hit the main
kill switch. The resulting kick back actually snapped the flying
electrodes which are made of 1/8"
welding tungstens.
Take care,
Bart"
What about the SAFETY GAP directly across the transformer??????????????//
Ed
I do not understand the significance of the gap across the NST, Therefore I
did not incorporate this feature.
Thank you very much,
Marko
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