Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

Register Log in
  • Congratulations KootK on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

REF CT Class

Status
Not open for further replies.
SK07

SK07

Electrical
May 9, 2007
33
For restricted earth fault protection relay for transformer, what Class of current transformers are used. Is it 5 P 10 or class X and why?
In the existing system I find Current Transformer Class 5P10 used for REF for Transformer.
Thanks in advance.
 
Replies continue below

Recommended for you

Sort by date Sort by votes
It depends on the type of principle used for REF protection.
In case of High impedance type, Class-X (or Class-PX) is recommended.
If it is low impedance type (also known as Bias type), Class-P type is acceptable.
More details can be found in the Relay literature.

R Raghunath
 
Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

stuckbreaker
  • Question
Exceeding Metering Class CT Burden Rating
Replies
4
Views
380
stuckbreaker
stuckbreaker
Elektromange
  • Locked
  • Question
Parallell CT for 7UT86 1
Replies
2
Views
124
slavag
slavag
Madka
  • Locked
  • Question
Ct saturation
Replies
2
Views
153
DiscoP
DiscoP
HiSet
  • Locked
  • Question
Accuracy of Px class CT 2
Replies
5
Views
279
scottf
scottf
chao_david
  • Locked
  • Question
Meter shows current values during CT secondary injection but zero after energization 2
Replies
13
Views
396
wcaseyharman
wcaseyharman

Part and Inventory Search

Sponsor

Back
Top Bottom