Power Electronics
In forward blocking mode of a thyristor

  junction J3 is in forward bias and J1, J2 is in reverse bias.
  Junction J1 and J2 is in forward bias and J3 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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Power Electronics
Delay time is defined by the interval when

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

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