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TAN DELTA TEST FOR POWER TRANSFORMERS

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TAN DELTA(INSULATION DISSIPATION FACTOR)

Tan delta is the insulation power factor & is equal to the ratio of power dissipated in the insulation in watts to the product of effective voltage & current in volt ampere when tested under sinusoidal voltage.

PROCEDURE

All windings immersed in insulating liquid.

All windings shortcircuited using bare braided jumper such that jumper shall not be allowed to sag.

All bushings in place.

Temperature of winding & insulation liquid near to the reference temperature(27 degree).

All bushings cleaned properly.

Transformer earthed properly.