If 'α' is the firing angle and 'β' is the extinction angle of a given SCR, then which of the following relations between them is true?

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MPPGCL JE Electrical 28 April 2023 Shift 1 Official Paper
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  1. Conduction angle = β - 2α
  2. Conduction angle = β - α
  3. Conduction angle = 2β - α
  4. Conduction angle = β + α

Answer (Detailed Solution Below)

Option 2 : Conduction angle = β - α
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Detailed Solution

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Explanation

  • The firing angle (α) is the point at which the SCR is triggered (turned on).
  • The extinction angle (β) is the point at which the SCR turns off (due to current dropping below the holding current or due to forced commutation).
  • The conduction angle(γ) represents the duration for which the SCR remains conducting.


Since conduction starts at α and ends at β, the conduction angle is given by:

Conduction angle = β - α

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