Tan delta test is an AC low voltage dielectric test that is carried out on insulation to determine its health. Tan Delta test is also called as loss angle test or dissipation factor test.

Tan Delta test is carried out on various electrical equipments such as :
1) Current Transformer
2) Potential Transformer
3) Transformer Bushing
4) Transformer Windings
5) Capacitive Voltage Transformer
6) Coupling Capacitor

 Purpose:
Detecting incipient weakness in HV insulation
Predicting remaining life of the equipment under test
To get “benchmark reference reading” of the equipment when it is new, clean, dry and free from impurities
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