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The delta-connected autotransformer with $\pi/6$ phase-shift angle is widely used in the multipulse rectifier when the output voltage of the autotransformer is approximately equal to its input voltage. If its output voltage is slightly greater than its input voltage, the equivalent kilovoltampere (kVA) rating of the autotransformer increases rapidly, and each core limb of the autotransformer has...
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