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When an extra SCR is connected in series with a string

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in Power Electronics by (27.1k points)
When an extra SCR is connected in series with a string

(a) DRF decreases

(b) DRF increases

(c) DRF remains constant

(d) None of the mentioned

This question was posed to me in final exam.

I need to ask this question from Interconnecting Thyristors topic in section Power Electronics Devices of Power Electronics

1 Answer

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by (45.1k points)
Right option is (b) DRF increases

The best I can explain: DRF = 1 – String efficiency

String Efficiency = Rating of the whole string/(rating of one SCR x number of SCRs)

Extra SCR will reduce the string efficiency which in turn increase the DRF.

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