RE: Why does running an NST on an async gap kill it?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Zagarus Rashkae by way of Terry Fritz <teslalist-at-qwest-dot-net>" <arbitrarily_random-at-yahoo-dot-com>

Hi Gary, All,

I called it an "R-L-C" filter since the wirewound
power resistors do have significant inductance, and
they do help suppress spikes.

I don't see how resonant rise can possibly destroy the
NST if there are MOVs and a saftey gap.

Regards,

Chris Lu

--- Tesla list <tesla-at-pupman-dot-com> wrote:
 > Original poster: "Lau, Gary by way of Terry Fritz
 > <teslalist-at-qwest-dot-net>" <gary.lau-at-hp-dot-com>
 >
 > The so-called Terry filter actually has two
 > functional components:
 > 1) The R-C (not R-C-L) filter forms a low pass
 > filter, attenuating high
 > frequencies.
 > 2) The MOV's and safety gap form a clamp to limit
 > the maximum voltage to
 > the NST.
 >
 > The R-C filter alone can't do anything to limit the
 > voltage in the event
 > that the gap is not firing.  The MOV's might help,
 > but they're not designed
 > to absorb too much energy, and they might burn out.
 >
 > Gary Lau
 > MA, USA
 >
 > -----Original Message-----
 > From: Tesla list [mailto:tesla-at-pupman-dot-com]
 > Sent: Thursday, August 07, 2003 11:38 AM
 > To: tesla-at-pupman-dot-com
 > Subject: Why does running an NST on an async gap
 > kill it?
 >
 >
 > Original poster: "Zagarus Rashkae by way of Terry
 > Fritz
 > <teslalist-at-qwest-dot-net>"
 > <arbitrarily_random-at-yahoo-dot-com>
 >
 > Hi All,
 >
 > I think I pretty much phrased the entire question in
 > the subject line :)
 >
 > Is there anything one can to to protect the NST from
 > damage? Wouldn't an RLC filter like a Terry filter
 > protect the NST from spikes?
 >
 > Thanks,
 >
 > Chris Lu
 >
 >


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