Transformer Nomenclature

[Ron Reeland]

Hi:
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. Please see the attachment of the schematic.

What does "PWV" designate?

Normally, I would guess "peak working voltage", but that does not make sense to me at this time, especially when you look at the primary where the higher "PWV" of 535 does not seem to relate to the maximum 125 RMS input voltage.

But the secondaries  have "PWV's" lower than the RMS values. Apparently, the transformer was meant to be used in full-wave, center-tapped rectifying circuits as DC currents are given for each secondary.

Any insight would be appreciated.

Thanks,
Ron Reeland

[tautech]

I'm gunna stick my neck out and say it's related to insulation tests. 

BTW there's applications where windings might be subjected to elevated voltages and as each one is initially not referenced to circuit ground, it's a manufacturers spec to indicate the maximums that apply.

[RobertHolcombe]

Had a quick google and there are a few results with different PWV "values" - might just be a part number?

eg

http://bibbteck.com/chicago-standard-transformer-corp-pwv-715-power-transformer

[Shock]

This?

PVW, PWH, PCV  Ac Power/Energy Transducers
These units combine the function of the ac power transducers with an integrator(s) to provide contact output indicating energy.
(KW-hours, KVAR-hours).

http://www.miinet.com/Portals/0/DataSheets/Power_Transducer_Users_Guide_Moore_Industries.pdf

PWV Watt/VAR Transducer
Combined-function  unit  calculates both RMS active power and RMS reactive  power

http://www.miinet.com/Portals/0/DataSheets/PVT_PWT_PWV_Datasheet_Moore_Industries.pdf

[TimFox]

PWV usually indicates the maximum voltage between conductors and each other and to the case.  In rectifier usage, there may be a large DC voltage as well as the winding's AC voltage on a given wire.