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Re-wiring Delco 37.5 KVA generator for single phase

Re-wiring Delco 37.5 KVA generator for single phase

Re-wiring Delco 37.5 KVA generator for single phase

(OP)
Hello.

I purchased a three phase generator at a discount but need to use it primarily for single phase use.

My questions are similar to this thread:

http://www.eng-tips.com/viewthread.cfm?qid=168708

which was discussed with some great tips.

In my search, I came across this document regarding generator windings:

http://www.power-tronics.com/Diagrams/Generatorwiring.htm

I have some questions re. this table.

What would the numbers 1 through 12 represent exactly?  That is, what are the 'pairs' of leads that represent a winding? What is the phasing of the windings?  Ex - leads 1&2, 3&4, etc might be pairs and 1 and 3 might be the same phase.  Well 'phase' is not the word I am looking for here - you know what I mean - same 'end' of the winding.

Are all windings 'equivalent'?  That is, they give the same voltage, just differing by phase??

Maybe if someone could refer me to a sort of schematic of a generator with 12 leads, that would be helpful.

The only schematics I can find are things like this:

http://www.tpub.com/content/et/14093/css/14093_54.htm

Which shows just six terminals for the three phases.  What are the other three windings?

BTW, the generator is a Delco 37.5 KVA with a Detroit Diesel engine.  I think it was manufactured in the 70's.

Thanks for reading,

DJ

RE: Re-wiring Delco 37.5 KVA generator for single phase

dejaswa

Nos 1 to 12 represent various sections of ac winding as shown by nawao's attachment. Unless your generator had these sections brought out originally, you'll get only six leads normally.

A lps for both of you.

 

RE: Re-wiring Delco 37.5 KVA generator for single phase

Are you sure that it is not a 10lead machine?  That was very common for the older Delco/Detroit generators.
A 12 lead generator has 6 windings, two per phase.
Each end of each winding has a number.
The numbers are:
"A" phase, 1-4, and 8-10
"B" phase, 2-5,and 9-11
"C" phase, 3-6, and 10-12
In a 10 lead generator leads 10, 11, and 12 are connected internally and brought out as #10.
The bar/diamond connection, or the Collins connection was discussed a few days ago on this site.

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: Re-wiring Delco 37.5 KVA generator for single phase

(OP)
Thanks, guys. Great info.

I haven't looked to see what leads are available (10 vs 12).  Bought it but haven't picked it up yet.

Perhaps a silly question, but why are there two windings per phase rather than one?  Are they 'equivalent'.  Is it a mechanical issue?

I imagine that they are equivalent since they are paralleled or series connected.

Now I need to go back to the thread on 3->1 ph conversion and see if the 10 lead generator causes an issue with this.

Looks like it would, based on this chart as listed above:

http://www.power-tronics.com/Diagrams/Generatorwiring.htm

DJ

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