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 Power Transformer
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 Return to top of page · Post #: 1 · Written at 11:30:27 PM on 10 December 2012.
David G Dawson's Gravatar
 David G Dawson
 Location: Cundletown, NSW
 Member since 25 March 2010
 Member #: 639
 Postcount: 26

Have a vintage laminated Power Transformer here that I bought for my research but unable to identify the wires.
This is one of the mid blue alloy case types and is marked '1805A'.
Measures 100mm W x120mm H x 90mm D.
Has four wires coming from what I take to be the Primary side with two wrapped together and two loose.
Little stumped here as I don't understand why the four wires as they appear to have all been used.

Secondary also has two wires wrapped which are the HT and a 3rd wire for the Centre Tap.
Four more wires which I take to be Heater and/or Lamp supplies that measure about 15 ohms and one of these is O/C.

If anybody can assist it would be most appreciated.
Went through what I had of the Trimax, Ferguson and A&R transformers but did not see it there.

Always feel more comfortable if I know what I am working with else will use the Variac on low power with an ELCB and see what we get.
Thanks.

Smokey


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
Smokey

 
 Return to top of page · Post #: 2 · Written at 1:33:54 PM on 11 December 2012.
Wa2ise's avatar
 Wa2ise
 Location: Oradell, US
 Member since 2 April 2010
 Member #: 643
 Postcount: 830

Maybe the open connection wire connects to an internal electrostatic shield between possibly the mains primary and the secondaries?


 
 Return to top of page · Post #: 3 · Written at 1:45:20 PM on 11 December 2012.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6687

Has four wires coming from what I take to be the Primary side with two wrapped together and two loose.

Possibly a 120/240 volt primary, with the two windings in series for 240 volt operation.
 
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