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what will happen to a synchronous generator if it operates at lower (or higher voltage) than 5% of its rated voltage over a long period?
IEC 60034-1, chapter 7.1 gives the frequency and voltage limits during operation of rotating electrical machines. Operating zones A and B are defined. E.g. generators that run within a voltage range of +/- 5% and frequency range +/- 2% of the ideal operating point operate in zone A. Zone B lies within +/-8% voltage and +3% and -5% of the ideal operating point.
It is stated that:
"A machine shall be capable of performing its primary function within zone B, but may exhibit greater deviations from its performance at rated voltage and frequency than in zone A. Temperature rises may be higher than at rated voltage and frequency and most likely will be higher than those in zone A. Extended operation at the perimeter of zone B is not recommended."
I am specifically interested in the physical reason for the voltage limitations in synchronous generators. E.g. what will happen to a synchronous generator if it operates at lower (or higher voltage) than 5% of its rated voltage over a long period? What is the reason for these narrow voltage limitations?
Thank you so much for your help!
IEC 60034-1, chapter 7.1 gives the frequency and voltage limits during operation of rotating electrical machines. Operating zones A and B are defined. E.g. generators that run within a voltage range of +/- 5% and frequency range +/- 2% of the ideal operating point operate in zone A. Zone B lies within +/-8% voltage and +3% and -5% of the ideal operating point.
It is stated that:
"A machine shall be capable of performing its primary function within zone B, but may exhibit greater deviations from its performance at rated voltage and frequency than in zone A. Temperature rises may be higher than at rated voltage and frequency and most likely will be higher than those in zone A. Extended operation at the perimeter of zone B is not recommended."
I am specifically interested in the physical reason for the voltage limitations in synchronous generators. E.g. what will happen to a synchronous generator if it operates at lower (or higher voltage) than 5% of its rated voltage over a long period? What is the reason for these narrow voltage limitations?
Thank you so much for your help!