Excitation winding and fuction of AVR

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SUMMARY

The discussion centers on the malfunction of a generator's rotor winding, specifically a single-phase 220-volt AC generator with a capacity of 2000 kVA. The rotor winding was rewound but burnt out again within a day. The excitation winding provides 135 volts AC to the Automatic Voltage Regulator (AVR), which in turn supplies approximately 80 volts DC to the rotor winding. A mechanic suggests that the excitation voltage should be around 70 volts AC and the DC output to the rotor should be 18 volts DC. The issue appears to stem from a potential short circuit between the main winding and rotor winding, leading to excessive voltage and repeated failures of the rotor winding.

PREREQUISITES
  • Understanding of generator components, specifically rotor and stator windings.
  • Knowledge of Automatic Voltage Regulators (AVR) and their function in electrical systems.
  • Familiarity with AC and DC voltage principles and measurements.
  • Experience with troubleshooting electrical faults in generators.
NEXT STEPS
  • Investigate the specifications and operation of the AVR used in the generator.
  • Learn about the implications of short circuits in generator windings.
  • Research methods for testing excitation winding voltages and rotor winding integrity.
  • Explore best practices for rewinding generator rotor windings to prevent future failures.
USEFUL FOR

Electrical engineers, generator technicians, and anyone involved in the maintenance and troubleshooting of single-phase generators will benefit from this discussion.

mars shaw
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I have a generator.
Single phase
220 volt A.C output
Frequency 50 Hz
2000 kVA

Rotor winding of my generator was burnt.
It was rewinded but it burnt again after 1 day.
There are 2 types of windings in stator one main winding which gives 220 volt A.C output and 2nd is excitation winding which is giving 135 volt A.C to AVR and then AVR is giving about 80 volt D.C to rotor winding for excitation.
But mechanic says that excitation voltage that are abtain from excitation winding to AVR should be about 70 volt A.C and the D.C voltage which is given to rotor from AVR should be 18 volt D.C.
According to him main winding and rotor winding are short to each other so that's why excitation winding is giving high voltage.

Now in this situation I think AVR is exciting the rotor after regulating voltage and main output is still 220 because of AVR.
But AVR is between excitation winding and rotor winding so it shoult burn first. Why rotor winding is burning again and again?
Now where is the fault in AVR, stator winding, excition winding or complete stator winding.
 
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