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To calculate the string efficiency of the series-connected silicon-controlled rectifiers (SCRs), we need to determine the total voltage rating of the string and compare it to the applied string voltage.
1. Total voltage rating of SCRs:
Since there are six SCRs, each rated for 600 V, the total voltage rating for the string is:
[
text{Total voltage rating} = 6 times 600 , text{V} = 3600 , text{V}
]
2. Applied voltage:
The applied string voltage is 3300 V.
3. String efficiency formula:
The string efficiency is given by the ratio of the actual voltage applied to the maximum voltage rating of the string:
[
text{String efficiency} = frac{text{Applied voltage}}{text{Total voltage rating}} times 100
]
[
text{String efficiency} = frac{3300 , text{V}}{3600 , text{V}} times 100 = frac{3300}{3600} times 100 approx 91.67%
]
Thus, the string efficiency is approximately 91.67%.