DC Excitation System

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DC Excitation System

The DC excitation system has two exciters – the main exciter and a pilot exciter. 

The exciter output is adjusted by an automatic voltage regulator (AVR) for controlling the output terminal voltage of the alternator. 

The current transformer input to the AVR ensures limiting of the alternator current during a fault.

When the field breaker is open, the field discharge resistor is connected across the field winding so as to dissipate the stored energy in the field winding which is highly inductive.

dc-excitation-system

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