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A three phase fully controlled bridge converter is feeding a load drawing a constant and ripple free load current of 10 A at a firing angle of 30°. The approximate Total Harmonic Distortion (%THD) and the rms value of fundamental component of the input current will respectively be
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- 31% and 6.8 A
- 31% and 7.8 A
- 66% and 6.8 A
- 66% and 7.8 A
Correct Option: B
Rms value of load current,
Is = Io √2 / 3 = 10 √2 / 3 = 8.165 A
Supply current
Rms value of fundamental current,
| is1 = | sin | = |  |  | = 7.8 A | |||||
| √2π | 3 | √2π | 2 |
Then, THD (Total harmonic distortion)
= 0.31 = 31%
