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[AMPS] Re: flux leakage (not)

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Subject: [AMPS] Re: flux leakage (not)
From: (
Date: Thu, 19 Jun 1997 14:41:18 +0000
> From:          Peter Chadwick <>
> To:            amps <>
> Subject:       [AMPS] failures
To: <>
> Date:          Thu, 19 Jun 97 14:21:00 +0000

> It is leakage reactance,  as opposed to winding resistance that limits
> the current? If so, what's the power factor, or doesn't one worry?

Hi Peter,

It is the transformer's ESR, not leakage reactance, that limits 
inrush current.

The ESR, as you seem to know, is mainly a combination of primary 
and secondary copper losses, core losses, and flux that 
order. Flux leakage is by far the most insignificant of the three, 
generally being so small it is ignored in the transformer's design 

73, Tom W8JI 

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