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To calculate the string efficiency (η) for a series of silicon-controlled rectifiers (SCRs), you can use the formula:
[
eta = frac{V_{string}}{n times V_{SCR}} times 100
]
where:
– (V_{string}) is the total string voltage.
– (n) is the number of SCRs in series.
– (V_{SCR}) is the individual voltage rating of each SCR.
Given:
– (V_{string} = 3300 , V)
– (n = 6)
– (V_{SCR} = 600 , V)
Substitute the values into the formula:
[
eta = frac{3300}{6 times 600} times 100
]
[
eta = frac{3300}{3600} times 100
]
[
eta = 0.9167 times 100 approx 91.67%
]
So, the string efficiency is approximately 91.67%.