Engineering · Electrical — AVR
The automatic voltage regulator (AVR) of an AC generator holds the terminal voltage constant by adjusting the:
- AField excitation current✓ Correct
- BPrime mover fuel rack
- CBus frequency
- DConnected load
Explanation
The AVR senses output voltage and varies field excitation to keep voltage steady as (especially reactive) load changes. Real power/frequency is set by the governor; voltage and reactive power are governed by excitation.
Authority: Modern Marine Engineer's Manual; AC generators
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