reply to post by whywhynot
…The crane sizes are not sufficient,
Any place that has the appropriate lifting ability and clearance can be used for the tear down and reconstruction. The rewinding and core build up can
be done at a different location if need be.
….the rewind equipment is too small.
Basic manual bobbin winding equipment is simple to build. Even from scratch. Variable dc drive motor operated by a foot peddle and a turns counter.
It’s the automated winders that are hard to come by. Manually winding a large core is relatively simple, it just takes time.
I just got done rewinding and restacking a 150kw 3p dry transformer core on my own time, at my own place for a new application for my own use (current
limited, welding). I did it with hand tools, and didn’t even use a turns counter. The core weighed over a half ton beforehand. It weighs around 600
pounds after I got done. I still have a stack of laminations and two of the old windings down in the barn. I am thinking of using the remaining core
material and make a heavy gauge spot welder. A couple paralleled 400kcmil conductors for the welding leads, but that is another project for another
….But again, how do you repair transformers when there is no power for pumping fuel for trucks or emergency generators
I thought that was what the national guard and the military was for.
…..who is going to go get those blown transformers
Anyone with the appropriate equipment. Let the national guard make sure they have the fuel to run the equipment, and use that equipment to get the
transformer moved. End of story.
…….how and where are you getting the replacement windings and insulation for this huge influx of repair?
Normally, when a transformer fails, the entire core stack isn’t toasted. There is just one or two points of failure. In normal times, you change the
entire copper load to bring the core back to new specs. In an emergency situation, you can just isolate the failed part of the core and replace it.
You may not even have to replace 1/10 the total copper load in the transformer.
And the enameled/formvar wire used in large transformers is just a fraction of the total yearly market. If you had an emergency situation, you have
plenty enameled wire stocks to shift over to transformer use.
Here is an article that goes into the basic core stacking methods for larger transformers
edit on 11-4-2013 by Mr Tranny because: (no reason given)