Excitation winding and fuction of AVR

In summary, the conversation discusses a generator with a single phase and 220 volt A.C output, with a frequency of 50 Hz and a capacity of 2000 kVA. The rotor winding of the generator was burnt and rewound, but it burned again after one day. The mechanic believes that the excitation winding is giving too high of a voltage to the AVR, which in turn is providing too much voltage to the rotor winding. This raises questions about the fault being in the AVR, stator winding, excitation winding, or the complete stator winding, in a 2kVA generator.
  • #1
mars shaw
10
0
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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  • #2
sorry it is 2kVA
 

Related to Excitation winding and fuction of AVR

What is an excitation winding?

An excitation winding is a coil of wire that is used to provide a magnetic field in the rotor of an alternator or generator. This magnetic field is necessary for the production of electricity.

How does an excitation winding work?

The excitation winding is connected to a DC power source, which creates a constant magnetic field in the rotor. As the rotor spins, this magnetic field cuts across the stator windings, inducing an electrical current. This current is then used to power the automatic voltage regulator (AVR) and control the output voltage of the alternator.

What is the function of an AVR?

The function of an AVR is to regulate the output voltage of an alternator or generator. It does this by adjusting the excitation current in the rotor based on the load and electrical demand. This ensures a stable and consistent voltage output, regardless of changes in the load.

Why is an AVR important?

An AVR is important because it helps maintain a stable and reliable power supply. Without it, the output voltage of an alternator or generator can fluctuate, which can damage electrical equipment and disrupt the flow of electricity in a system.

What factors can affect the performance of an AVR?

The performance of an AVR can be affected by various factors, including the quality of the excitation winding, the strength of the magnetic field, and the accuracy of the voltage sensing circuit. External factors such as temperature and humidity can also impact the performance of an AVR.

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