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Output Voltage vs. Firing Rate (fwd)
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From: Richard Hull [SMTP:rhull-at-richmond.infi-dot-net]
Sent: Wednesday, August 12, 1998 12:09 AM
To: Tesla List
Subject: Re: Output Voltage vs. Firing Rate (fwd)
Tesla List wrote:
> ----------
> From: Antonio Carlos M. de Queiroz [SMTP:acmq-at-compuland-dot-com.br]
> Sent: Tuesday, August 11, 1998 10:34 PM
> To: Tesla List
> Subject: Re: Output Voltage vs. Firing Rate (fwd)
>
> John Freau wrote:
>
> > I used a 14.4kV,
> > 1.5kVA, potential transformer to power the TC. Ballast is adjustable from
> > 2mH to 19mH in steps, toroid is 4" by 17", secondary is 4" by 23", #28
> > formvar, close wound, primary is 19 turns, #12pvc ins. stranded wire,
> > close wound at 15 degree inverted cone. Cap is .007uF.
>
> > Test 1: Using this 42" spark TC with sync-gap, the sparks easily hit 40",
> > at 640 watts (wallplug) as measured with a wattmeter.
>
> I would take a look at what is the wattmeter actually measuring.
> With small ballast inductance in a potential transformer, the input waveforms,
> specially of the current, can be far from sinusoidal, and a wattmeter designed
> for 60 Hz operation may give wrong results.
>
> Antonio Carlos M. de Queiroz
Nice understatement!
No moving coil watt meter will give accurate readings with a TC going full blast!
The power dynamics of all those capacitive/inductive loads fighting back and forth
just can't be followed or even averaged by such an inertia limited system.
Richard Hull, TCBOR