The insulation looks good. Is it really?
Test results do not always tell the whole story.
Field Examples
How many more years do you think this transformer will operate?
Sometimes the answer is hidden where nobody looks.
Are cable rating tables always enough?
A thermal model can reveal hot spots before failures occur.
Which cable is actually the hottest?
It is not always where you expect.
Can a problem be seen before it happens?
Engineering models allow alternative solutions to be evaluated during design.