Previous in Forum: 12V Magnatron   Next in Forum: Cantilever Force
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
3 comments
Rate Comments: Nested
Muthuvel
Power-User

Join Date: Jun 2012
Posts: 115

Grading Ring

11/10/2012 2:42 AM

why there is no grading in surge arrester which is located in over head line?

and can any body tell me the types of surge arrester used to

protect the high voltage line?
Register to Reply
Pathfinder Tags: Surge Arrester
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!
Joshi
Guru

Join Date: Oct 2007
Location: India
Posts: 1246
Good Answers: 34
#1

Re: Grading ring

11/10/2012 3:56 AM

What do you mean by "no grading in surge arrester"? Can you give some example?
Register to Reply
RAMConsult
Guru
Engineering Fields - Power Engineering - New Member

Join Date: May 2007
Location: NYC metropolitan area.
Posts: 3230
Good Answers: 444
#3
In reply to #1

Re: Grading ring

11/10/2012 1:06 PM

It means that there is no grading ring in the surge arrester. A grading ring is used to distribute the electrostatic field near high voltage connections to ensure that the field gradient does not exceed approximately 30kV/cm, the breakdown voltage for air as an insulator. Above this corona may appear depending upon the ambient conditions.

The reason that there are no grading rings is probably because OP is looking at a 66kV class arrester whereas grading rings are usually found on equipment above 138kV, though in some cases conditions may warrant their use at a lower voltage.

__________________
 “Tell me and I forget. Teach me and I remember. Involve me and I learn.” Ben Franklin.
Register to Reply Score 1 for Good Answer
No more "Almost" Good Answers.
nobodysomebody47
Power-User

Join Date: Nov 2011
Posts: 171
Good Answers: 1
#2

Re: Grading Ring

11/10/2012 11:58 AM

check this

surge IMPEDANCE LOADING (SIL) Calculation & Lightning arresters Selection
Register to Reply
Register to Reply
Have a Different Question?
3 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:

Joshi (1); nobodysomebody47 (1); RAMConsult (1)

Previous in Forum: 12V Magnatron   Next in Forum: Cantilever Force

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 (62 right now)
Show Members
Advertisement