What type of pole mount transformer has one primary connector and four secondary connectors?

[LarryFine]

Absolutely.

To reiterate, the only difference between three-bushing and four-bushing dual-voltage secondaries is whether you need to open the can to re-configure for switching voltage via parallel vs series.

 

[Frank DuVal]

> Richmond, VA

ahhhh.... home of the beautiful Byrd Theatre and its wonderful WurlTzer organ!

The Mighty Wurlitzer Organ - Byrd Theatre

The Mighty Wurlitzer Organ is perhaps The Byrd’s most recognizable trademark and was designed as a “one-man0orchestra” to accompany silent movies.

byrdtheatre.org

YES! The hidden Jewel. Built as both a silent film theater, hence the Wurlitzer, and the Western Electric sound system for talkies.

I first went there as a small child and that chandelier was great (see, signs of electrician from the beginning ).

 

[LarryFine]

I first went there as a small child and that chandelier was great (see, signs of electrician from the beginning ).

I have been in the attic over the chandelier, and seen the maintenance winch.

 

[mdlueck]

These are radiator tubes for the oil, not heat sinks in the traditional sense, but they do the same thing.

Having them is one option for any given rating. Having a larger can volume is another.


Nor would I, but most three-bushing transformers are dual windings, not center-tapped.


I don't believe so; it's just an older design. Three-bushing units are the same internally.


Again, it's just an older design of dual-secondary transformers, which most still are.

Greetings Larry,

I would think the transformer in the photo on the left would be an actual heat sink, while the transformer in the photo on the right would be what you mentioned about oil running through radiator tube. The one in the photo on the left appears to be just flat plates of steel.

So if a three bushing vs four bushing are really the same thing on the insides.... then why are these that I took photos of so much larger around than other transformers in the same area? I mean.... larger size, four bushings.... "must be something different / unusual about that transformer".

Right, with four bushing transformers, could connect the secondary side in parallel... the one I got a photo of, 167 kw, times two, would mean 334 kw of 120v when the secondaries are connected that way, correct?

I am thankful,
Michael Lueck

 

[LarryFine]

I would think the transformer in the photo on the left would be an actual heat sink, while the transformer in the photo on the right would be what you mentioned about oil running through radiator tube. The one in the photo on the left appears to be just flat plates of steel.

No, the unit in the left pic, and the larger single pic, has oil passages in the fins. Note where the sides of the "plates" touch along the line in the middle and around the edges, and have an 0-shaped gap between them elsewhere. The round tubes separating the plates carry oil out of and back into the can via convection; up in the can, down in the fins.

So if a three bushing vs four bushing are really the same thing on the insides.... then why are these that I took photos of so much larger around than other transformers in the same area? I mean.... larger size, four bushings.... "must be something different / unusual about that transformer".

I would guess due to older design, different capacity, etc. I'm not sure why.

Right, with four bushing transformers, could connect the secondary side in parallel... the one I got a photo of, 167 kw, times two, would mean 334 kw of 120v when the secondaries are connected that way, correct?

Negative. The given capacity is for the entire unit. You either have 167w at 240v or 167kw at 120v. What changes is the available current, not the available power.