A three-phase semi-converter circuit is given a supply of 400 V. It produces at the output terminals an average voltage of 381 V. Find the rectification efficiency of the converter circuit.

To find the rectification efficiency (η) of the converter, we can use the formula:

[

eta = frac{V_{dc}}{V_{s}} times 100

]

Where:

– ( V_{dc} ) = Average output voltage = 381 V

– ( V_{s} ) = RMS supply voltage for a three-phase system = 400 V

Now, substituting the values into the formula:

[

eta = frac{381}{400} times 100 = 95.25%

]

Answer: The rectification efficiency of the converter circuit is 95.25%.