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Re: Westinghouse Transformers (newbee)
>Date: Sun, 16 Feb 1997 18:06:53 EST
>From: Nick h McQuiston <voltmaster-at-juno-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Westinghouse Transformers (newbee)
>
>About two weeks ago I was digging around in a junk yard and found 8
>westinghouse
>step down transformers. They are encased in hard rubber and measure 10in.
>by 10in. by 12in. Luckily one had a plate on it saying < Type PTM Ratio
>1:120 Primary 14400V F.W. imp. test 95>. I took one and sparked a 30VDC
>power supply off the secondary an the primary threw a spark about an inch
>and a half to two inches.
>
>I just wondered if any one knew how to wire one up in reverse to run a
>TC.
>
Nick,
8 Huh? drool, envy;)
You have Potential transformers. They are design to precisely
step down a high voltage for measurement. Your's take 14,400 volts and
divides that by 120 to get 120 volts (full scale). If you reverse it
and put 120 volts into it's "secondary" you will get 14,400 volts out
of it's "primary". These are great transformers of TC use. Please do
not abuse it by applying 30Kv to it's secondary again. 30Kv to it's
primary would be fine as that is rated for several hundred KV spikes.
These transformers have no built in current limiting, so you will have
to put something to limit the current in the 120v side. An electric
oven's heating element will work. An arc welder can be used by
shorting it's low voltage / high current side and placing it's 220V
input in series with your potential transformer. You can then adjust
the current into the potential transformer by adjusting the arc
welder's current setting.
Great find!
jim