Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

Congratulations waross on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Double test for generator

Thread starter mohanlal
Start date Jan 7, 2006

Status: Not open for further replies.

Jan 7, 2006

mohanlal

Electrical

We have installed 3.3KV, 8 MW generator sets.Recentlt one testing contractor conducted Double Test (Tan delta) and confirms that the insulation detoriates and require retesting after six months.
What is the optimum Tan delta value for healthy generator stator winding?
How to compare Tandelta value with Polarisation Value?
Subra