14. Separate voltage-regulating units provide voltage-ratio control under load b

Question

14.   Separate voltage-regulating units provide voltage-ratio control under load by      A. exciting transformers having their primaries delta-connected. B. causing different impedance drops in each phase. C. combining voltages from different phases. D. having series transformers in phase with the line-to-neutral voltage. 14.   Separate voltage-regulating units provide voltage-ratio control under load by      A. exciting transformers having their primaries delta-connected. B. causing different impedance drops in each phase. C. combining voltages from different phases. D. having series transformers in phase with the line-to-neutral voltage.

Explanation / Answer

B. By causing different impedance drops in each phase.

They change the number of windings connected in secondary to provide voltage-ratio control under load. The tap is moved up and down in secondary to have constant voltage ratio.

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