Doble Testing
Doble Testing
(OP)
Could somebody please point me towards the details of a "Doble Test". The test in question is regarding a large power transformer. (Power generation facility main transformer) My research shows that it entails a little more than PF IR and Megg test.
Thank you for your assistance, Jason
Thank you for your assistance, Jason






RE: Doble Testing
http://www.doble.com/
or search this forum for more info.
RE: Doble Testing
RE: Doble Testing
RE: Doble Testing
If this is a large and expensive transformer, it may be worth doing an Frequency Response Analysis (FRA) test, as developed by the CEGB in the UK, to get a 'fingerprint' of the transformer against which future tests may be compared.
We used FRA after a generator transformer fed in to a severe close-in fault, and we were concerned that winding movement might have occurred. The FRA test would (probably) pick this up more easily than a Doble type test, and possibly avoid the need to drain thousands of litres of oil.
The FRA test doesn't replace the Doble test, but it is a useful complement to it. Like the Doble test, it is a job best left for the specialists who are experienced in interpreting the results.
RE: Doble Testing
http://www.usbr.gov/power/data/fist/fist3_30/3_30_4_7.htm
etc. for more info
RE: Doble Testing
The more info...the better!!
Thanks, Jason