Dry Type Tafo

I dunno. Is it possible to disprove it?

Prove what?

Is the word is "to provide" OR only "prove"?

You should be able to prove the existence of OLTC in a dry type transformer by opening the enclosure.

The OLTC will either be present or it won't.

Some of us would like to know what OLTC means. Not everybody knows the acronyms.

On Load Tap Changer OLTC) as opposed to a No Load Tap Changer (NLTC). The devices are used on large power transformers to adjust the output voltage and/or phase shift relationship of the transformer. On Load means that the tap position can be changed while the transformer is carrying load current, No Load means the opposite.

Here's more info than you'll ever need unless you're a Power Engineer:

http://en.wikipedia.org/wiki/Tap_%28transformer%29

Can OLTC not mean Off Load Tap Changer also....?!

It is possible OLTC in dry trasfo , if we can control the arc during tap changing

The answer is yes, if you have the money. Here's a solution for you:

http://www.reinhausen.com/desktopdefault.aspx/tabid-53/92_read-64/