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Re: [TCML] Transformer nomenclature/abbreviations

On 6/9/17 5:14 PM, jimlux wrote:
On 6/9/17 2:38 PM, Ronald Reeland wrote:

I picked up a relatively high voltage transformer at a Hamfest
recently. It is a sealed unit, gray painted steel housing, leading me
to think it is military spec. There are some abbreviations shown on
the transformer schematic that are not clear to me.

It has a tapped primary for 105, 115, and 125 volts. But also shown
is "535PWV".

And three center-tapped secondaries:

1.  1130 V RMS, .150 AMP DC, PWV 1070 2.  1190 RMS, .025 AMP DC, PWV
1070 3.  412 V RMS, .500 AMP DC, PWV 715

What does PWV stand for? "Peak Working Voltage" does not seem to be
appropriate, particularly on the primary.

Could that be max "voltage to core" (i.e. insulation rating).  Center
tapped secondaries are usually used to drive a fullwave rectifier, so
the max voltage of the 1130V winding, relative to the center tap is
1.414*1130/2 = 799V

In some circuits, there might be a bias (e.g. a filament supply that's
floated at the cathode voltage, in a grounded grid, or grounded anode
circuit)  That's the way microwave ovens are, for instance: the filament
is actually at the HV, so the insulation on the filment winding is rated
for twice the voltage of the HV winding (MO use a voltage doubler, and
one end of the HV winding is grounded to the core)

So you don't design for more voltage resistance than you need
(insulation costs money, mass, and volume)

And it appears the transformer is deigned for full-wave rectifier
circuits using the secondary center taps and the DC AMP rating are
maximum that should be drawn through the rectifiers. Does that sound


Transformer made by "Chicago Standard Transformer Corp, Chicago, IL.
Numbers on case are "TF1RX03YY", 672-1049-00, and CSTC 28447.

Some decoding

CSTC = Chicago Standard Transformer Corp

aka Stancor in the "consumer" market

http://www.tubebooks.org/file_downloads/stancor_1959.pdf  is a catalog

28447 is probably the FSCM (Federal Supply Code for Manufacturers, now called CAGE Commercial and Government Entity) number for the company
look it up here:
although 28447 seems to be Kessel Kitchen Equipment, which is unlikely.

BTW the number TF1RX03YY doesn't seem to be a part number, more like a general nomenclature saying how many windings, etc. 1 primary, 3 secondary, etc.

Nice, small power supply transformer, by Chicago Standard, Cat. NO. PHC-4, TF1RX03YY. Pri 117 v 50/60 Hz.; Sec. 450 VCT at .040 A DC; 6.3 V CT at 2.0 A; 5.0 V at 2 A. ...

And I also found it here:

The 672-1049-00 is probably part number, and in fact it shows up as an old Collins part number which cross references a NSN (National Stock Number)


And now that you know it has a Collins part number you can probably track down what sort of transmitter or widget it was used in.

I did not have any success doing on-line searches looking for "PWV".


Ron Reeland

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