Re: Power in a TC System

To: tesla-at-pupman-dot-com
Subject: Re: Power in a TC System
From: "Malcolm Watts" <malcolm.watts-at-wnp.ac.nz> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Mon, 15 May 2000 17:25:00 -0600
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi Gavin,

On 15 May 00, at 7:59, Tesla List wrote:

> Original Poster: "Gavin Dingley" <gavin.dingley-at-astra.ukf-dot-net> 
> 
> Hi all,
> Up until now, I have been using the primary tank capacitor reactance to
> judge the power used by my TC system. That is, I calculated the
> capacitors reactance at the mains frequency (50Hz) and divided the
> square of the kV output of my NST by it. P=V^2 / X. Does this give a
> true indication of system power?
> 
> The alternative would be to multiply the number of brakes per second in
> the SG by the energy stored in the capacitor, that is,
> 
> ((C V^2) / 2) * Bps
> 
> Which is correct?

Your second option is correct as long as both quantities are 
measured rather than inferred.  Option 1 is a difficult measure as 
there are transient conditions present which steady state quantities 
don't account for.

Regards,
Malcolm