It's the basic guidance for tan delta test.
Tan delta = Ir/Ic
That is the basic equation. Everyone knows this equation.
What I wanted to focus on is the basic concept of insulators to which acts as a capacitor.
Basic equations-
tan δ or D.F = IR/IC
P.F = IR/(IR+IC)
Acceptable value of tan δ ≤ 0.007 or 0.7% AT 20̊ C
tan δ test can be carried out on following equipments-
Cable
Transformer oil, winding, bushings
CVT
Current transformer
Any insulator
Safety points to remember-
Always ensure proper earthing of the equipment before testing.
Do not keep the tan δ point open after testing. The open tan δ point may cause rise of potential at the point which will result into flashover & equipment damage further.
Keep the C.T/CVT secondarys shorted & earthed properly during tan δ testing.
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