of course, plot the resistance change after the heat run and power OFF :)
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]On
Behalf Of Partain, Chuck
Sent: Friday, February 10, 2006 3:22 PM
To: amps@contesting.com
Subject: Re: [Amps] transformer talk
ok so now...
is this a good start for checking a transformer?
Specify 2000 vac at say 1 amp.
the test is
manufacture the device for unloaded output 3% higher (whats that 60-100v)
short the secondary and apply an input voltage until you reach the specified
output of 1a
watch the heat rise over (IEEE specs I think) 6 hours with a thermocouple or
until it
gains no more than 1deg c per hour.
plot resistance drop of pri and sec every 15 seconds for 15 mins and see plot
delta.
make sure seconfdary resistance is VERY low ~11 ohms.
Hi pot to whatever, say 10kv
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