Varnish
Varnish
(OP)
Dear Friends,
We were doing maintenance on a 2MVA dry type transformer and we found a lot of varnish particles on the floor. We were told that the transformer was running hot. what can be cause of this?
Transformer is almost 10 years old.
We were doing maintenance on a 2MVA dry type transformer and we found a lot of varnish particles on the floor. We were told that the transformer was running hot. what can be cause of this?
Transformer is almost 10 years old.






RE: Varnish
RE: Varnish
One possibility is that the varnish has been there since manufacture (has the unit previously been inspected and varnish not there?)
Can you post a picture. (www.tinypics.com)
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RE: Varnish
Verify its PM history, if found nothing like; previuos application of varnish, or other things the relates to varnish that is, re-insulation. Then, your TX has a definite problem that sooner will emerge to failure.
Evidently, in your case, it really indicates high temperature operation. But dont panic, have you check the load currents, ventillations? First, clear up this parameters that affect the unit, and perhaps you'll never post a thread and you'll have the confident to dealt with this problem.
Furthermore, check the functionality of your imbedded RTD sensor on winding for condition monitoring purposes or any non contact temp detecting equipment.
Actually, Dry-type TX is almost maintenance free as other manufacturer's claim.
RE: Varnish
Another possibility is that the varnish cracked from the windings shifting during a fault or too many de-energization/energization cycles.
Look for cracked varnish on the windings or core, and loose blocking.
RE: Varnish
respectfully