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Why is a minimum firing angle (>0, usually 5-15°) defined for three-phase thyristor rectifier?

I would like a technical explanation.

Thanks

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The minimum firing angle for a three-phase thyristor is 30 degree. Below thirty degrees the thyristor is already reverse biased by the third thyristor that is already conducting. Let's understand the waveform: Minimum firing angle of three-phase thyristor

If the minimum firing angle is less than 30, the circuit operates in continuous conduction mode instead.

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  • \$\begingroup\$ Hi, To comply with the rule about referencing material from elsewhere, can you please edit the answer & add a link to that image (or reference the book title & author, if it came from a book)? Thanks. (I'll delete this comment after the reference is added, to avoid clutter.) \$\endgroup\$ – SamGibson Jun 8 '18 at 1:03

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