Power Electronics
Delay time is defined by the interval when

 anode current reaches 10 % from forward leakage current.
 gate current increases from 90 % to 100 % of its final value.
  all of these.
 anode voltage drops from 100 % to 90 % of its actual value.

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Power Electronics
In forward blocking mode of a thyristor

  Junction J1 and J2 is in forward bias and J3 is in reverse bias.
  junction J3 is in forward bias and J1, J2 is in reverse bias.
  Junction J1, J3 is in reverse bias and J2 is in forward bias.
  junction J2 is in reverse bias and J1, J3 is in forward bias.

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