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Electrical Test Riddle No.2 - Generator loss tangent test
Please find the final test report of an industrial generator which submitted by an international famous manufacturer for a new production as following. Why determination of insulation capacitance or loss tangent in %20Un is more important than rated voltage?
What is your opinion?

Author : Hamid - From: Iran- Firouzabad in Fars
Thu, January 6th, 2011 - 08:09
Something has been mistaken . It is not Tan Delta at 20% of rated voltage . It is the difference of Tan Delta at steps of 10% or 20% .
Generators manufacturers use insulating paints in end winding of stator (normal insulation is not possible for end winding) . The performance of insulating paint is not linear versus voltage increasing and nonlinear performance should be verified.   
Author : Glavizh - From: Iran
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