Previous in Forum: MCC Panel Shop Drawing   Next in Forum: Maximum Demand Controller
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
9 comments
Rate Comments: Nested
subhashparekh
Participant

Join Date: Dec 2010
Posts: 1

Electrical Engineer

12/28/2010 2:38 PM

I am planning to use 27/59 (GE IAV53K) relay for main transformer protection during backfeed operation when main generator links are removed. The Transformer is Delta-Y Grd. The relay will be connected thru CTs on Delta (Low Voltage) side. The Cts are Grd Y-Grd Y

Can you explain, what happens to voltages and currents on Delta side when one of the Y side (345kV) lines faults to ground. How this one single phase relay could provide indication of over volatge as well as under voltage conditions?

Thanks.

CR4 Admin - email address removed

From the Site FAQ: Do not post phone numbers or email addresses. The CR4 Admin will delete all phone numbers posted in threads or comments, and we strongly urge you not to put up email addresses.
Register to Reply
Pathfinder Tags: Relay 27/59
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!
lisa123636
Participant

Join Date: Dec 2010
Posts: 3
#1

Re: electrical engineer

12/28/2010 2:45 PM

CR4 ADMIN: Deleted Post

Spam: This post was deleted because it contained advertising outside the Commercial Space forum. Please review Section 14 of the CR4 Site FAQ about advertising.
Register to Reply Off Topic (Score 6)
lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#2
In reply to #1

Re: electrical engineer

12/28/2010 2:50 PM

CR4 ADMIN: Deleted Post

Irrelevant This post was deleted because it is related to a deleted post and would otherwise be taken out of context.
Register to Reply Off Topic (Score 5)
Doorman
Guru
Hobbies - DIY Welding - Don't Know What Made The Old Title Attractive... Popular Science - Weaponology - New Member United States - US - Statue of Liberty - 60 Year Member

Join Date: Apr 2009
Location: Yellowstone Valley, in Big Sky Country
Posts: 7425
Good Answers: 295
#3
In reply to #2

Re: electrical engineer

12/28/2010 3:45 PM

CR4 Admin has been busy on this thread.

"...and would otherwise be taken out of context." Hmmm. This being the case, it is a wonder Admin lets me say anything at all.

__________________
 Semper Ubi Sub Ubi
Register to Reply Off Topic (Score 5)
lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#4
In reply to #3

Re: electrical engineer

12/28/2010 3:58 PM

At least I didn't have to go sit on the naughty step for my comments. I'm gettin' better.
Register to Reply Off Topic (Score 5)
TonyS
Guru
United Kingdom - Member - New Member

Join Date: Aug 2010
Location: Resting under the Major Oak
Posts: 4347
Good Answers: 181
#5
In reply to #4

Re: electrical engineer

12/28/2010 6:46 PM

True, but you're now classified as irrelevant

__________________
 The reports of my death are greatly exaggerated.
Register to Reply Off Topic (Score 5)
lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#6
In reply to #5

Re: electrical engineer

12/28/2010 6:50 PM

Not just irrelevant, but "Irrelevant"!!!!!!!!!

After all I've done for them!
Register to Reply Off Topic (Score 5)
biswanath.das
Power-User

Join Date: Oct 2006
Location: Kolkata, India
Posts: 447
#7

Re: Electrical Engineer

12/29/2010 12:39 AM

Due to fault in one phase voltage in other phases will be changed which will be sensed by the 59 relay.

__________________
 BNDas
Register to Reply
67model
Guru

Join Date: Dec 2010
Posts: 1686
Good Answers: 116
#8

Re: Electrical Engineer

12/29/2010 5:03 AM

Surely you mean connecting relay to VT/PT (Voltage/Potential Transformers), not CT (current transformers)!! By convention, the high voltage side of a transformer is written first e.g. 11/0.4 kV, writing Y grd - delta would have been better. If you had put IAV53K into a Google search you would have got to http://www.gedigitalenergy.com/products/manuals/iav/geh1814.pdf, which is the manual for the relay, which will show how it does under and over voltage in one box.
Register to Reply Score 1 for Good Answer
No more "Almost" Good Answers.
Anonymous Poster
#9

Re: Electrical Engineer

12/29/2010 10:54 AM

It was good answer but CR4 ADMIN deleted my post.

CR4 ADMIN: Deleted Post

Spam: This post was deleted because it contained advertising outside the Commercial Space forum. Please review Section 14 of the CR4 Site FAQ about advertising.
Register to Reply
Register to Reply
Have a Different Question?
9 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:

67model (1); Anonymous Poster (1); biswanath.das (1); Doorman (1); lisa123636 (1); lyn (3); TonyS (1)

Previous in Forum: MCC Panel Shop Drawing   Next in Forum: Maximum Demand Controller

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 (77 right now)
Show Members
Advertisement