Previous in Forum: HT Breaker   Next in Forum: Inverter Current
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
8 comments
Rate Comments: Nested
awaiscnpp
Associate

Join Date: Jun 2011
Posts: 30

What Is Effect On Generator In Case Loss Of Excitation?

08/22/2013 11:34 AM

what is effect on generator in case loss of excitation and any protection is not operate?what effect on power,speed,voltage and P.F?

if possible please explain with graph and also tell reference.
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
North of 60
Guru
Canada - Member - If there is a way to screw someting up, there is someone to do so! Safety - Hazmat - New Member

Join Date: Mar 2007
Location: Iqaluit, NU. Canada
Posts: 1854
Good Answers: 140
#1

Re: what is effect on genarator in case Loss of excitation?

08/22/2013 11:50 AM

Sounds like homework, which we do not do. But... if you want to discuss it, tell me, what do you think will happen?

__________________
 Joe Contractor to Electrical Inspector, "What do you mean you are going to make me follow the code?".
Register to Reply
PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#2

Re: what is effect on genarator in case Loss of excitation?

08/22/2013 11:58 AM

?

__________________
 "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
Register to Reply Score 1 for Good Answer
No more "Almost" Good Answers.
redfred
Guru
Engineering Fields - Electrical Engineering - Been there, done that. Engineering Fields - Control Engineering - New Member

Join Date: Dec 2008
Location: Long Island NY
Posts: 15600
Good Answers: 981
#3

Re: What Is Effect On Generator In Case Loss Of Excitation?

08/22/2013 12:21 PM

I'm not at all excited with your question. Please graph for us your enthusiasm for this question to be answered. References should contain your bank account number and password.

__________________
 "Don't disturb my circles." translation of Archimedes last words
Register to Reply Score 1 for Off Topic
K_Fry
Guru

Join Date: Feb 2011
Location: Atlanta, GA
Posts: 1053
Good Answers: 110
#4

Re: What Is Effect On Generator In Case Loss Of Excitation?

08/22/2013 12:23 PM

You can attach a graph to your post to show what you think would happen.

Also, if you want to pursue this, you will need to better describe what you mean by "generator." 2 kW portable? 200 MW stationary? What speed governing is in effect? What protections are in place? Etc, Etc.

__________________
 Think big. Drive small.
Register to Reply Score 1 for Off Topic
Mike W
Power-User

Join Date: Sep 2012
Location: Seattle, WA, USA
Posts: 147
Good Answers: 9
#5

Re: What Is Effect On Generator In Case Loss Of Excitation?

08/22/2013 5:15 PM

Voltage droops when it loses excitation

__________________
 You have to actively participate in the manifestations of your own joys and good fortunes - they are not ready made for the taking, they are available for the making.
Register to Reply Score 1 for Good Answer
Go to Next "Almost" Good Answer
RAMConsult
Guru
Engineering Fields - Power Engineering - New Member

Join Date: May 2007
Location: NYC metropolitan area.
Posts: 3230
Good Answers: 444
#6

Re: What Is Effect On Generator In Case Loss Of Excitation?

08/22/2013 10:50 PM

If you observed something odd when you were operating (not just watching) the controls of a generator, why not tell us what happened and we might help you figure it out, otherwise this question has been answered multiple times on CR4, type loss of excitation into the search box here and in Google.

__________________
 “Tell me and I forget. Teach me and I remember. Involve me and I learn.” Ben Franklin.
Register to Reply
dhayanandhan
Guru
Engineering Fields - Mechanical Engineering - New Member

Join Date: May 2008
Location: CHENNAI, TAMIL NADU, INDIA.
Posts: 1851
Good Answers: 65
#7

Re: What Is Effect On Generator In Case Loss Of Excitation?

08/23/2013 5:21 AM

Dear Mr.awaiscnpp,

You have to inform few more details, such as,

1. Whether the Generator is working independantly.? (OR)

2. Whether the Generator is operating in parallel with some other Generator.?

3. You have mentioned "WITH GRAPH" - What exactly you mean by this graph.?

For - Question No.1 above, the Electrical Power output from Generator WILL BE ZERO, and lead to DARK OUT,, the Prime mover will be working and Generator will be running at its rated speed.

For - Question No.2 above, that is working in Parallel with other Generator, the REVERSE POWER WILL TRY TO FLOW into the Generator, to WORK as A SYNCHRONOUS MOTOR, if Breaker has NOT TRIPPED. For this Excitation is a must and in the absence of Excitation, the Breaker will trip, the other Generator will be Loaded further.

What is the graph you are referring, pl. explain.

DHAYANANDHAN.S
Register to Reply Off Topic (Score 4)
sriram1988
Associate

Join Date: Sep 2011
Posts: 47
Good Answers: 2
#8

Re: What Is Effect On Generator In Case Loss Of Excitation?

08/23/2013 11:02 PM

Generator : synchronous or asynchronous (induction generator) ?

synchronous generator

Protection:

1) Relay 40 G to detect the loss of excitation.

2) Directional power relay to monitor the power flow.

Effect

1) Speed :There will be a oscillate ,since rotor will try to lock into synchronous speed.

2) Power : Reactive power consumption increase (4 times) depending upon the generator and grid condition.

Excellent source of info :

http://cr4.globalspec.com/thread/83329#comment921936

click the search button ...
Register to Reply
Register to Reply
Have a Different Question?
8 comments

"Almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, vote them!
Copy to Clipboard

Users who posted comments:

dhayanandhan (1); K_Fry (1); Mike W (1); North of 60 (1); PWSlack (1); RAMConsult (1); redfred (1); sriram1988 (1)

Previous in Forum: HT Breaker   Next in Forum: Inverter Current

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Electrical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (74 right now)
Show Members
Advertisement