|We may have covered this in the past, but I can't find any info on the subject. Has standardizied inspection temperature criteria ever been established and published by a creditable source? Something I can quote and reference when I put numbers in the acceptance criteria. That is to say, Delta T's or temperature rise above ambient on components.
I am revising our thermography procedure and need to update or add some inspection criteria as to what is acceptable or not. Examples would be:
1) If the Delta T. between like components is this___ perform the following.
2) Acceptable temperature rise above ambient on 500kv transformer bushing is ___.
If you are like me you have your own acceptance criteria, but the company doesn't want to hear " Well because Joe Blow said that was too hot". We have acceptance criteria spread all over the company. Substation has their acceptance criteria and I have mine.
Sometimes you will find multipule sources of information all with different numbers. Most which are unrealistic.