Previous in Forum: NGR   Next in Forum: Transformer Capacity Remaining
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
11 comments
Rate Comments: Nested
Anonymous Poster #1

Anti Pumping Relay

01/26/2012 6:49 AM

what is working or main function of anti pumping relay in a breaker
Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Good Answers:

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

"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!
Anonymous Poster #2
#1

Re: anti pumping relay

01/26/2012 7:19 AM

http://in.answers.yahoo.com/question/index?qid=20070808220358AAIoujU
Reply Score 1 for Good Answer
No more "Almost" Good Answers.
4
electricalexpert65
Guru

Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#2

Re: anti pumping relay

01/26/2012 9:18 AM

To prevent "pumping" repeated close signals inadvertantly to the cloisng coil of a circuit breaker. Imagine a scenario, wherein there is an existing fault and the operator - unaware of thefault - attempts to close the breaker, by pressing the close push button or by turning the T-N-C Switch to the 'C' position. The breaker will attempt to close but the protective release would sense the fault and would trip the breaker. All this would happen within 100 milli seconds (assuming a closing time of 60 milli seconds and an opening time of 40 milli seconds). And, it is humanely impossible to release the hand from the close push button or the T-N-C Switch, within this 100 milli seconds. Thus, the closing signal would persist and the breaker would attempt another closure - under fault conditions. Most of the circuit breakers would not withstand such closing-under-fault conditions, twice in succession. The anti-pumping relay would prevent a second closing signal to the breaker closing coil, even if the Push Button/T-N-C Switch is kept pressed, thus avoiding the above danger.
Reply Good Answer (Score 4)
No more Good Answers. Go to first "Almost" Good Answer
giri
Power-User

Join Date: May 2009
Location: Some where on Earth !!!.
Posts: 243
Good Answers: 2
#5
In reply to #2

Re: anti pumping relay

01/27/2012 3:08 AM

What if we give a close inhibit interlock from the tripping relay?.The breaker closing coil will never get the supply on giving command.

__________________
 "Know something about everything and everything about something"
Reply
electricalexpert65
Guru

Join Date: Oct 2009
Posts: 2061
Good Answers: 169
#6
In reply to #5

Re: anti pumping relay

01/27/2012 3:40 AM

But, for the tripping relay to sense a current, breaker has to close first, you know! May be, such an arrangement would prevent the "post-fault-trip" closing of a breaker. But, how would you prevent the breaker closing if an attempt is made to close the breaker unaware of the fault?
Reply
giri
Power-User

Join Date: May 2009
Location: Some where on Earth !!!.
Posts: 243
Good Answers: 2
#8
In reply to #6

Re: anti pumping relay

01/27/2012 4:51 AM

"But, how would you prevent the breaker closing if an attempt is made to close the breaker unaware of the fault?"

Thats why close inhibit is given in the closing circuit to avoid closing of breakers in the event of fault existing.

Pls clarify if I am wrong.

__________________
 "Know something about everything and everything about something"
Reply
giri
Power-User

Join Date: May 2009
Location: Some where on Earth !!!.
Posts: 243
Good Answers: 2
#9
In reply to #6

Re: anti pumping relay

02/07/2012 4:41 AM

Pls respond sir.............! I was right.wasn't I?

__________________
 "Know something about everything and everything about something"
Reply Score 1 for Off Topic
giri
Power-User

Join Date: May 2009
Location: Some where on Earth !!!.
Posts: 243
Good Answers: 2
#11
In reply to #6

Re: anti pumping relay

03/08/2012 1:38 AM

Pls clarify if I am worng that a close inhibit from the master tripping relay can prevent the inadvertant closing of the breaker during fault conditions.

__________________
 "Know something about everything and everything about something"
Reply Score 1 for Off Topic
sathish-47
Active Contributor

Join Date: Jan 2012
Posts: 14
#10
In reply to #2

Re: anti pumping relay

03/04/2012 9:21 AM

can u please help me with this?what is the fixing contact and moving contact clearance of a HT breaker and also the permissible limits.
Reply
kvsridhar
Guru
India - Member - New Member

Join Date: Sep 2009
Location: Temporarily at Ashburn, VA
Posts: 2744
Good Answers: 164
#3

Re: Anti Pumping Relay

01/26/2012 10:38 AM

Nowadays, LV ACBs come with mechanical antipumping also, which gives additional safety over and above the electrical antipumping provided by the relay. We have had a lively discussion about this on this thread : cr4.globalspec.com/thread/55141

__________________
 Nothing worthwhile can ever be taught, it can only be learnt.
Reply
Vinodh
Associate

Join Date: Jul 2010
Posts: 32
#4

Re: Anti Pumping Relay

01/26/2012 10:52 PM

http://www.linkedin.com/news?viewArticle=&articleID=5567085696390279182&gid=4141766&type=member&item=90612586&articleURL=http%3A%2F%2Felectrical-engineering-portal%2Ecom%2Fanti-pumping-and-lockout-relays&urlhash=5xyI&trk=group_most_popular-0-b-shrttl
Surely this link helps you to understand thoroughly about Anti-Pumping relays.In addition if u need some more Technical articles kindly join Linkedin n make use of it in electrical engineering Portal group
Reply
kvsridhar
Guru
India - Member - New Member

Join Date: Sep 2009
Location: Temporarily at Ashburn, VA
Posts: 2744
Good Answers: 164
#7
In reply to #4

Re: Anti Pumping Relay

01/27/2012 3:54 AM

Thanks, it seems a superb website. i have enrolled. Am sure to learn. May even contribute

__________________
 Nothing worthwhile can ever be taught, it can only be learnt.
Reply
Reply to Forum Thread
Have a Different Question?
11 comments

Good Answers:

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

"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:

Anonymous Poster (1); electricalexpert65 (2); giri (4); kvsridhar (2); sathish-47 (1); Vinodh (1)

Previous in Forum: NGR   Next in Forum: Transformer Capacity Remaining

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 (112 right now)
Show Members
Advertisement