Re: SRSG break rate

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

Original poster: "Jason Petrou by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jasonp-at-btinternet-dot-com>

That Is my point too... If you have a total angle of 0 then you are wasting
energy, so why use Async
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, June 22, 2001 2:53 PM
Subject: Re: SRSG break rate


> Original poster: "Steve White by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<slwhite-at-zeus.ia-dot-net>
>
> This is my point exactly. With only a 120 BPS break rate, if voltage is
> applied across the cap from the 90 degree point to the 270 degree point
> without discharge, the cap is first charged positively and then
negatively.
> This gives a net charge of 0 between those phase angles. Under these
> conditions it appears to me that half of the transformer power is being
> wasted.
>
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Thursday, June 21, 2001 5:28 PM
> Subject: Re: SRSG break rate
>
>
> > Original poster: "Bill Vanyo by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <vanyo-at-echoes-dot-net>
> >
> > After reading Steve's original question, I'm still confused by the
> > answer.  I never gave it much thought before, but his question (or
> > rather the lack of an answer that I can grasp) has me puzzled.  Suppose
> > one break is at a positive peak.  Now, after that break, there is
> > positive voltage for a quarter cycle, then negative for a quarter cycle,
> > then the next break at the negative peak.  Won't the positive and
> > negative 1/4 cycles cancel each other out, as far as charge delivered to
> > the cap, before the next break?  It seems if you were to use 120bps (for
> > 60hz), or one break per half cycle, you would want the breaks to be at
> > the 0 voltage points.  This way, between breaks, you have either all
> > positive or all negative voltage, getting as much charge to the cap as
> > possible.
> >
> > Of course, I'm new at this, and either:
> > a) I don't know what the heck I'm talking about, or
> > b) Everybody already knew this.
> >
> > I'm interested, because I'm thinking of going to rotary (synchronous,
> > with NST's), and I want to get it right.
> >
> > BTW, is the voltage/current at the secondary of my NST's in phase with
> > the mains?  If not, is it always out of phase by the same degree?  I'm
> > just trying to get a handle on how to adjust the phase of a synchronous
> > rotary gap, without fancy equipment I don't have (like oscilloscopes).
> > I don't want to fry my NST's.  If I use the fluorescent-light-as-strobe
> > technique, the light will flicker in phase to the mains - hopefully the
> > same as the phase of the NST's high voltage side.
> >
> > -  Bill Vanyo
> >
> > Tesla list wrote:
> > >
> > > Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> > <FutureT-at-aol-dot-com>
> > >
> > > In a message dated 6/21/01 10:00:27 AM Eastern Daylight Time,
> > > tesla-at-pupman-dot-com writes:
> > >
> > > > Original poster: "Steve White by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <
> > > > slwhite-at-zeus.ia-dot-net>
> > >
> > > Steve,
> > >
> > > There are two peaks in a full sine wave.  One positive peak and one
> > > negative peak.  100 or 120 bps operation takes advantage of these
> > > peaks.  But the main benefit of 100 or 120 bps is not this, but
> > > rather the way that the sparks grow in the air over successive
> > > bangs.  For a given amount of energy in the caps over time, 120
> > > seems to be more efficient at producing long sparks from the work
> > > I've done.  I found about a 20% benefit from using 120 bps over 240
bps.
> > >
> > >   http://hometown.aol-dot-com/futuret/page3.html        (click on theory)
> > >
> > > Cheers,
> > > John
> > >
> > > >
> > > >  I have been following the posts on SRSG break rates. Some people
seem
> to
> > > > think
> > > >  100 BPS (50 HZ) or 120 BPS (60 HZ) is best. It seems to me that 200
> BPS
> > > (50
> > > > HZ)
> > > >  or 240 BPS (60 HZ) would be optimum. Here is why I think this. If
you
> > > > examine a
> > > >  single cycle of sine wave, there are 4 positions of maximum
charging
> for a
> > > >  capacitor. During the first 1/4 cycle (starting at 0 degrees), the
> cap
> > > would
> > > >  reach its peak charge at about the 90 degree point of the sine
wave.
> At
> > > this
> > > >  point the cap should be discharged. Continuing to charge the cap
past
> 90
> > > >  degrees without discharge would not charge the cap any further
> because the
> > > >  voltage is now decreasing towards 0 at the 180 degree point. After
> > > > discharging
> > > >  at the 90 degree point, the charge cycle can begin again at the
peak
> > > voltage
> > > >  and continue charging until the 180 degree point is reached. At
this
> > > point,
> > > > the
> > > >  cap should again be discharged because after the 180 degree point,
> the
> > > > voltage
> > > >  will go negative and the cap will not reach any higher charge. 2
more
> > > > discharge
> > > >  points can be identified for the negative voltage at the 270 and
360
> > degree
> > > >  positions. This reasoning assumes that the transformer can supply
> > > sufficient
> > > >  current to fully charge the cap in 1/4 cycle. If not, then higher
> break
> > > > rates
> > > >  may be better.
> >
> >
> >
> >
>
>
>