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avra.setcl
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Join Date: Nov 2012
Posts: 21

VAR Flow Control

08/14/2014 5:32 AM

suppose a alternator is connected to grid by a tie line. now consider that the tie line is drawing VAR( Inductive reactance) from the alternator.

Now , if this inductive reactance of the tie line increase then the alternator have to deliver more VAR to the tie line. to deliver this increasing VAR load what to do as a operator of the alternator?
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Crabtree
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#1

Re: VAR flow control

08/14/2014 5:52 AM

It's not real load, though.

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lyn
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#2

Re: VAR flow control

08/14/2014 6:01 AM

Get a bigger imaginary alternator?
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RAMConsult
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Engineering Fields - Power Engineering - New Member

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#3

Re: VAR Flow Control

08/14/2014 8:44 AM

Good interview question, how did you answer it? The obvious answer, raise the terminal voltage of the alternator with an increase in the excitation, requires explanation.

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avra.setcl
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Join Date: Nov 2012
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#5
In reply to #3

Re: VAR Flow Control

08/17/2014 1:00 AM

obviously! if i increase field excitation then generator will produce more var and it will be delivered to the tie line.Now, my question is that with increase with excitation will active power also increase?
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RAMConsult
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#7
In reply to #5

Re: VAR Flow Control

09/17/2014 1:31 PM

Only negligibly, it may even go down, it all depends upon things that your interviewer did not specify.

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sensourabh
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Join Date: Aug 2014
Posts: 35
#4

Re: VAR Flow Control

08/15/2014 4:15 AM

Reactive power requirnent can be fullfilled by magnitic field energy in generator. In airgap between stator & rotor there is magnetic field which can be increase by increasing field excitation . This way we can fullfill higher kvar load requirement .
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avra.setcl
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Join Date: Nov 2012
Posts: 21
#6
In reply to #4

Re: VAR Flow Control

09/17/2014 12:11 PM

NOW , IF THE LOAD OF GENERATOR BECOMES CAPACITIVE(DUE TO ON CONDITION OF CAP BANKS) THEN VAR WILL FLOW FROM LOAD SIDE TO GENERATOR SIDE? THEN WHAT TO DO?
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RAMConsult
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#8
In reply to #6

Re: VAR Flow Control

09/17/2014 1:37 PM

It depends upon conditions that your interviewer did not specify. What to do also depends upon your operational goals; depending upon what your meters tell you you may not have to do anything (except to stop shouting, caps lock off).

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avra.setcl
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Join Date: Nov 2012
Posts: 21
#9
In reply to #8

Re: VAR Flow Control

08/31/2015 12:59 PM

If u do not have answer keep quite please
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avra.setcl (3); Crabtree (1); lyn (1); RAMConsult (3); sensourabh (1)

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