Machine-translated by Google. Questions are authored in English.
Top

Discussion

True or false: a Schering bridge measures the dissipation factor without regard to the voltage at which the test is made.

  • A.True, because balance is a null condition and a null cannot depend on amplitude
  • B.False, the loss tangent of a faulty specimen rises with stress
  • C.True, since the dissipation factor is a ratio and ratios are independent of voltage
  • D.True, provided the standard capacitor is rated for the voltage being applied

Answer: B

The whole point of testing at high voltage is that the loss tangent of a defective specimen rises with the applied stress, as voids begin to discharge. A tip-up curve of loss tangent against voltage is a standard diagnostic, so the test voltage is an essential part of the result.

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.