CR4 - The Engineer's Place for News and Discussion ®


Previous in Forum: Transformer Distribution Panel   Next in Forum: Nichrome Resistance Wire Globule Formation
Close
Close
Close
2 comments
Active Contributor

Join Date: Nov 2016
Posts: 12

Generator Mode

07/18/2017 1:36 AM

Dear all

good day

there is three mode for generator control (Voltage ,PF,VAR) in our GT .whats the

deference between them and We depend on what to choose any one.

thank for all

Register to Reply
Pathfinder Tags: generator mode
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".
4
Guru

Join Date: Mar 2007
Location: at the beach in Florida
Posts: 18227
Good Answers: 1058
#1

Re: generator mode

07/18/2017 1:52 AM

..."All that the VAr- or pf control does is automatically monitor VAr's or pf and adjust the generator terminal voltage to make the actual VAr's or pf equal to the setpoint."...

http://control.com/thread/1241213442

..."When paralleled to the utility bus, synchronous generators can be controlled using either terminal voltage or VAr/power factor (PF) control. Selection is dependent upon the size of the generator and the stiffness of the connecting utility bus. For large generators where the kVA is significant, these machines are usually terminal voltage regulated and dictate the system's bus voltage. When smaller terminal voltage regulated generators are synchronized to a stiff utility bus, the system voltage will not change as the smaller generator shares reactive loading. However, if the system voltage changes significantly, the smaller generator, with its continuous acting terminal voltage regulator, will attempt to maintain the voltage set point. As the voltage regulator follows its characteristic curve, it may cause either over or under excitation of the smaller generator. Excessive system voltage may cause a small generator to lose synchronizing torque, while low system voltage may cause excessive heating on the generator or excessive overcurrent operation of the excitation system. Maintaining a constant reactive load on the smaller generating unit can reduce the generator field current variations and, thus, reduce the maintenance of the collector rings and brushes."...

http://ieeexplore.ieee.org/abstract/document/1058126/

http://www.eng-tips.com/viewthread.cfm?qid=107396

__________________
Life is like riding a bicycle. To keep your balance you must keep moving. A.E.
Register to Reply Good Answer (Score 4)
Guru

Join Date: Mar 2011
Location: Lubbock, Texas
Posts: 11465
Good Answers: 136
#2
In reply to #1

Re: generator mode

07/18/2017 4:57 PM

Nicely done. I would not take anything away from that.

It all depends on the operator's situation, and the size of his generator, etc.

__________________
If it ain't broke, don't fix it. Just build a better one.
Register to Reply
Register to Reply 2 comments
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".

Previous in Forum: Transformer Distribution Panel   Next in Forum: Nichrome Resistance Wire Globule Formation

Advertisement