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Re: Input Power Measurement
Subject: Re: Input Power Measurement
Date: Wed, 28 May 1997 17:31:16 +1200
From: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
Organization: Wellington Polytechnic, NZ
To: tesla-at-pupman-dot-com
Hi Skip, all,
I don't know whether the answer is going to please or
not......
> From: Skip Greiner <sgreiner-at-wwnet-dot-com>
> Organization: Greiner, Ltd.
> To: tesla list <tesla-at-pupman-dot-com>
>
>
> Hi All
>
> It is obvious to all that any given transformer can be run in excess of
> its rating. Thus, a 1kva transformer may be run with 2kva input and
> live. This does not mean that the TC is being run at 1kva since the
> transformer is rated at 1kva.
>
> How can the actual input power to the TC be measured????????
Technically, it is Ecp x BPS = Power. To get an accurate measurement
requires measuring cap voltage/energy at gap fire time over a number
of cycles and measuring the number of breaks during this period. That
is pretty hard to do in a non-sync system because energy per gap
fire can vary enormously. I think most people will be stunned to see
the actual figure pop out. In most cases it is just a fraction of
power as measured at the wall although a careful choice of "current
limiting" inductance can help improve this figure greatly. Actually,
I think Greg summed it up well in a post earlier where he mentioned
dwell time shunting the power source. For pure inductive charging
(minimal resistive losses), the shorting of the power source is not a
big issue resistive loss-wise, but it does subtract from the time
available for cap charging.
My two cents. I stand to be corrected.
Malcolm
<snip>