AVR fault possible? Can you help?

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SUMMARY

The discussion centers on troubleshooting voltage issues with a 1MW alternator experiencing significant voltage drops under load conditions. After replacing the Automatic Voltage Regulator (AVR), the voltage stabilized at 400V under a 17kW load. However, when a 50kW load is applied, the voltage drops dramatically despite checks on the exciter components and connections. Participants are prompted to consider adjustments to the voltage roll-off point as a potential solution.

PREREQUISITES
  • Understanding of Automatic Voltage Regulators (AVR)
  • Knowledge of alternator operation and load characteristics
  • Familiarity with electrical components such as diodes and surge suppressors
  • Basic principles of voltage regulation and power factor correction
NEXT STEPS
  • Investigate voltage roll-off point settings on the AVR
  • Learn about load bank testing procedures for alternators
  • Research troubleshooting techniques for voltage regulation issues
  • Explore the impact of power factor correction on alternator performance
USEFUL FOR

Electrical engineers, technicians working with alternators, and professionals involved in power generation and voltage regulation troubleshooting.

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AVR fault possible?? Can you help?

Hi there and hello to ALL,

First post and greatfull for any help.

I've got an alternator suffreing voltage problems. To start with the voltage droped off to 360v when carring a small load of 17kw. New avr fitted and now running at 400v correctly.
The alternator is rated for 1MW.
Now when a small load of 50kw is applied via a load bank the voltage drops dramatically (not hunting).
We've checked the exciter (diodes, surge suppressors) and all is well and all connections to and from the avr are ok. We've run the thing solely on the avr, disconnecting a var. comp. and the pf correction unit yet we are still experiencing a drop in voltage.

Does anyone have any idea, please?
 
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Has the voltage roll-off point been set at all? Have you tried adjusting it?
 

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