Discussion
A tan delta or dissipation factor measurement on insulation reveals
Answer: A
Correct answer: the dielectric losses and their growth with voltage
Tan delta measures how much of the current through the insulation is in phase with the voltage, which is the loss component. More revealing than the absolute value is the tip-up: a sharp rise as the voltage is increased indicates voids ionising internally, and therefore deterioration in progress rather than merely a lossy material.
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