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

Previous in Forum: Diodes+H2O   Next in Forum: power plant
Close

Comments Format:






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:







7 comments
Anonymous Poster

TIE Breaker & Bus Coulper

04/27/2007 1:44 AM

Dear Sir,

what is the Difference between TIE Breaker & BusCoupler?

How does Tie breaker generally help us?

Reply
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 "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, rate them!
Power-User

Join Date: Dec 2006
Location: Bolingbrook Illinois, a southwest suburb of Chicago.
Posts: 368
Good Answers: 3
#1

Re: TIE Breaker & Bus Coulper

04/27/2007 11:50 PM

The tie (as in knot) breaker is usually open, keeping the 2 sections separated. When one power source fails, the tie breaker can be closed (tied) to maintain service through the section, as opposed to a planned service outage. They may be motorized, but are not usually automatic in operation. A bus coupler is usually found in the substation to support a weak or under-capacity section to balance load and prevent nuisance trips.

At least in DC distributuions.

RichH

__________________
"People find it easier to forgive you for being wrong than for being right" J K Rawlings
Reply
Power-User

Join Date: Apr 2007
Posts: 180
Good Answers: 3
#2
In reply to #1

Re: TIE Breaker & Bus Coulper

04/28/2007 12:19 AM

In AC substations, a bus tie breaker is can be run normally open or closed depending on the loads and configurations.

If two bus sections each have there own feed sources, the tie is run open (two separate systems) and if either source fails the dead bus can be restored by closing the tie.

Some configurations operate with a normally closed tie breaker (maybe called a coupler) that can supply a number of feeders from several sources (remember there can be several bus sections involved)

Should an internal fault occur within the station confines, these (coupling) breakers can open an isolate the damaged bus area with out shutting down the whole station. This is done by what is called a bus differential relay scheme where all the incomming and outgoing currents are summed up (and should equal zero) If they do not then there is a fault within the station yard confines. The coulpler breakers open and isolate the faulted area.

I understand that large warships and aircraft use simular schemes.

Reply
Anonymous Poster
#6
In reply to #2

Re: TIE Breaker & Bus Coulper

12/23/2009 10:24 PM

Hi snaker, Can you call this concurrently maintainable, will the closed system at the bus tie will avoid total failure between two main breakers. How about chances of failure in the bus tie? Thanks, JJ

Reply
Guru
Safety - ESD - New Member India - Member - New Member Engineering Fields - Energy Engineering - New Member

Join Date: May 2007
Location: Pune , India
Posts: 824
Good Answers: 39
#3

Re: TIE Breaker & Bus Coupler

05/11/2007 9:12 PM

In electrical distribution systems with two sets of similar incoming feeders are feeding two independent bus ,it is a good practice to connect the two bus bars with a breaker called bus coupler . This enable the buses to be operated independently for normal operation and when ever there is a break down or planned preventive maintenance on one set of In coming feeders the power need not be switched off instead the defective feeder can be isolated and the bus coupler be switched on so that entire bus can still remain on and supply power to both the bus.

A tie breaker is generally used when a stand by third feeder is provided for emergency stand by to provide power supply when both the feeders to the bus is failed .This is needed since normally the main source of both the feeders are same and when breakdown occurs on the main source or preventive maintenance is done the power supply fails .Then the incoming breakers are switched off and tie breaker is switched on along with bus coupler to avoid power failure to the installation in such circumstances also.

Reply
Anonymous Poster
#4
In reply to #3

Re: TIE Breaker & Bus Coupler

05/25/2009 11:44 PM

In consonanse with your statement, I used the word bus coupler to separate two independent power sources, however Consultant from other company has other terms, according to him, it should be called a bus tie or bus section.

With this, may I know where did you get the sources or reference regarding this terms.

thanks, tim

Reply
Commentator
Engineering Fields - Power Engineering - New Member

Join Date: Feb 2009
Location: Tamil Nadu
Posts: 66
#5
In reply to #4

Re: TIE Breaker & Bus Coupler

07/12/2009 1:22 PM

The best description.

Bus coupler - connects two different buses N/O

Bus sectionaliser - Divides a bus N/C

Bus tie- Ties a bus to another incomer on emergency N/O

__________________
Better not count the cent if the risk is many many dollars.
Reply Score 1 for Good Answer
Anonymous Poster
#7
In reply to #5

Re: TIE Breaker & Bus Coupler

06/21/2010 8:45 AM

This is a perfect answer.

Manoj Prasad

TATA STEEL

Reply Off Topic (Score 5)
Reply to Forum Thread 7 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 "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, rate them!
Copy to Clipboard

Users who posted comments:

Anonymous Poster (3); Jans (1); NoSciFi (1); Snakers (1); V.I.Abraham (1)

Previous in Forum: Diodes+H2O   Next in Forum: power plant

Advertisement