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Anonymous Poster

Power Swing Problems

08/19/2008 4:58 AM

Power Swing Problem

An industrial power system includes one gas turbine generator (6KV, 12 MW), a step up transformer (6/20 KV, Dyn11, 20 MVA) and relevant distribution system. The 20 KV side of power transformer is earthed by a low impedance neutral grounding resistor. The rated current of resistor is 250 A for 10 seconds.

According to operator's electrical reports, some times badly power swing occurs in electrical system especially after one sever earth fault.

What is your opinion? How we can solve this problem?

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Sparkstation
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#1

Re: POWER SWING PROBLEM

08/19/2008 5:50 AM

Hello again, "Guest".

There are many reasons.

You need to reply, with

Kind Regards....

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Anonymous Poster
#2
In reply to #1

Re: POWER SWING PROBLEM

08/19/2008 8:07 AM

Usually there are a lot of reasons for our unknown subjects.
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jack of all trades
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#3

Re: Power Swing Problems

08/19/2008 11:00 PM

Can you better define "power swing". To me this means the generator started acting like a load and the power started to flow into the generator instead of out of it.

Do you mean large voltage variation on one or more of the phases, or large current thru the neutral grounding resistor due to a large phase imbalance or phase to ground fault on the 20kV (star) side?

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Anonymous Poster
#5
In reply to #3

Re: Power Swing Problems

08/21/2008 4:05 AM

For power swing concept, you can refer to power system stability term.
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jack of all trades
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#6
In reply to #5

Re: Power Swing Problems

08/21/2008 3:27 PM

Thank you for telling me my job, I actually do design and work with power transmission and distribution systems.

Unless you want a broad generalised response covering numerous possible causes relating to "power swing" (along with a lecture on basic power generation and transmission theory), could you perhaps supply more detailed information on what your problem is, what problems it is actually causing you or your equipment/operators and what you want to limit/prevent/protect/understand.

Is this an actual power problem or some homework question?

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Anonymous Poster
#8
In reply to #6

Re: Power Swing Problems

08/23/2008 12:43 AM

All our question are actual problems.
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Sparkstation
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New Zealand - Member - Interested in everything- see my Profile please APIX Pilot Plant Design Project - Member - Member Engineering Fields - Electrical Engineering - Member Engineering Fields - Power Engineering - Member Engineering Fields - Civil Engineering - Member Hobbies - Musician - Autoharp and Harmonica Hobbies - Hunting - Member Hobbies - Fishing - Member

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#4

Re: Power Swing Problems

08/20/2008 4:08 AM

Hello "Guest",

You get this fine DVD Rewinder, which is the improved model with automatic stop

This exact same problem (complete with the misspelled words) occurs in various other Internet sites:

Definitely at: http://community.myelectrical.com/forums/thread/24244.aspx

Probably also at:http://electrical-riddles.com

I think we are being played for suckers.

It appears that our "Guest" hopes one of us will give the answer here, so it may be copied and "answered" by "Guest" at the other sites, under his/her Username there, as his/her own work.

Kind Regards....

__________________
 "The number of inventions increases faster than the need for them at the time" - SparkY
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jack of all trades
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#7
In reply to #4

Re: Power Swing Problems

08/22/2008 12:02 AM

Given that this is a practical engineering problem forum, could you please indicate somewhere in your posts that what you are posting is in fact a theoretical problem for fun and not an actual practical question to a problem that requires an answer.

You will get a different set of pleasant answers if you do so, especially if you make it clear that it is not a homework question.

Thank you.

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Anonymous Poster
#9
In reply to #7

Re: Power Swing Problems

08/23/2008 6:38 AM

It is not a homework question.
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engilis
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Posts: 105
#10

Re: Power Swing Problems

03/04/2017 2:32 PM

POWER SWING:

...Depending on the severity of the disturbance and the actions of power system controls, the system may remain stable and return to a new equilibrium state experiencing what is referred to as a stable power swing. Severe system disturbances, on the other hand, could cause large separation of generator rotor angles, large swings of power flows, large fluctuations of voltages and currents, and eventual loss of synchronism between groups of generators or between neighboring utility systems....

Power System returned normal state at last without blackout in this sample.

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Anonymous Poster (4); engilis (1); jack of all trades (3); Sparkstation (2)

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