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Calculate the line voltage for 3-∅ 120° VSI if the value of DC supply is 96 V.(a) 68.25 V(b) 67.87 V(c) 66.25 V(d) 62.14 VI got this question at a job interview.My enquiry is from Solid-State Switching Circuits in division Introduction to Solid-State Switching Circuits of Electric Drives

Answer»

The correct CHOICE is (b) 67.87 V

Best explanation: The line VOLTAGE for 3-∅ 120° VSI is (VDC÷√2)=.707×96=67.87 V. In 3-phase 120° VSI each phase conducts for 120° and only three switches from different PHASES conduct at a SINGLE TIME.



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