Previous in Forum: Earthing Impedance Formula   Next in Forum: Restraing Slope for Differential Relays
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
4 comments
Rate Comments: Nested
engrjawwad05
Active Contributor

Join Date: Jan 2010
Posts: 23

Current Transforrmer Connection

03/08/2010 1:46 PM

Dear Friends.

Hope, u all are well and busy in your professional life..

While connecting a CT, the output of secondary is shorted and grounded... but my question is that... are the CTs internally shorted or not????

Regards

Jawwad Siddique
Register to 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".
perry
Power-User

Join Date: Dec 2006
Posts: 346
Good Answers: 6
#1

Re: Current Transformer Connection

03/08/2010 1:54 PM

engria;the current transformers are shorted if they are NOT CONNECTED TO AN AMMETER, OR WATT-HOUR METER perry
Register to Reply
3
jack of all trades
Guru
New Zealand - Member - Kiwi Popular Science - Weaponology - New Member Engineering Fields - Power Engineering - New Member Engineering Fields - Electrical Engineering - New Member

Join Date: Sep 2006
Location: Auckland, New Zealand
Posts: 8777
Good Answers: 376
#2

Re: Current Transforrmer Connection

03/08/2010 4:19 PM

are the CTs internally shorted or not????

No, CTs are not internally shorted. The outputs are externally shorted for safety reasons to ensure the secondary windings are not accidentally open-circuited when current is passing through the primary (as this creates a very dangerous voltage on the secondary). Once the secondary(s) of the CT are connected to the associated current measurement device then the short is removed. If the short was internal inside the CT then the CT secondary current could never be measured.

__________________
 jack of all trades
Register to Reply Good Answer (Score 3)
No more Good Answers.
GW
Guru

Join Date: Oct 2006
Location: Surrey BC Canada
Posts: 1571
Good Answers: 42
#3
In reply to #2

Re: Current Transforrmer Connection

03/08/2010 11:13 PM

and then there was the CT that some bloke dropped a wrench on. It became internally shorted! (Caused the motor protection to go south and cost plenty to repair!)
Register to Reply Off Topic (Score 4)
sefaili
Participant

Join Date: Mar 2010
Posts: 4
#4

Re: Current Transforrmer Connection

03/09/2010 3:13 PM

if there is current transformer on circuit and if you dont want to use that ct and their secondary, you have to shorted it also grounded then.

it hasn't got any shorted or grounded inside. know so

Selamunaleykum.
Register to Reply Off Topic (Score 5)
Register to Reply
Have a Different Question?
4 comments

Good Answers:

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

Users who posted comments:

GW (1); jack of all trades (1); perry (1); sefaili (1)

Previous in Forum: Earthing Impedance Formula   Next in Forum: Restraing Slope for Differential Relays

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 (82 right now)
Show Members
Advertisement