Previous in Forum: Tripped by Differential Rele (87)   Next in Forum: Applications, Specifications and Ratings of Staters
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
Anonymous Poster

33kV Cable Connections

03/15/2009 8:57 PM

Concept designing a 33kV indoor switchboard with 4 feeders and 4 incomers SF6 breakers, bus coupler as well. Now using 300mm2 copper for incomers and 300mm2 al for feeders. When designing cable layout does it matter if the incomers cross the outgoing feeders at 90 degrees , i heard somewhere to try and minimise this due to electromagnetic induction opposing the current in each cable? Does spacing at a specified distance minimise this induction?

regards

Wayne
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".
2
V.I.Abraham
Guru
Safety - ESD - New Member India - Member - New Member Engineering Fields - Energy Engineering - New Member

Join Date: May 2007
Location: Pune , India
Posts: 875
Good Answers: 42
#1

Re: 33kV Cable Connections

03/16/2009 10:07 AM

While bringing the cable from outside to inside the substation you need to provide sufficient loop for all the eight cables considering for future maintenance . So with that you can plan laying them with out crisscrossing ,by laying them at different levels . Spacing is required to avoid mutual induction and damage to other cable in case of sort circuit and fire near the end termination due to any reason, mostly due failure of termination joints.Avoid criss crossing while terminating cables .
Reply Good Answer (Score 2)
No more Good Answers.
Rad00
Participant
New Zealand - Member - New Member

Join Date: Jul 2008
Location: Ngaruawahia, New Zealand
Posts: 3
#2
In reply to #1

Re: 33kV Cable Connections

03/16/2009 3:37 PM

Thankyou I will allow for spacing and sufficient bending radius, keeping cables inline for termination.

Regards

Rad

__________________
 Rad00
Reply
harry potter
Power-User

Join Date: Nov 2008
Location: India
Posts: 333
Good Answers: 6
#3
In reply to #1

Re: 33kV Cable Connections

03/18/2009 8:06 AM

dear,

crossing with 90 deg. the effect of electro magnetic induction is nil.

but due to practical problems in working, as stated in earlier comment, is better.

__________________
 Exploring the Science of Electricity
Reply
Anonymous Poster
#4
In reply to #3

Re: 33kV Cable Connections

03/19/2009 10:45 AM

The effect of the magnetic induction may be nil, but derating will occur due to the mutal heating of the cables.
Reply
Reply to Forum Thread
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:

Anonymous Poster (1); harry potter (1); Rad00 (1); V.I.Abraham (1)

Previous in Forum: Tripped by Differential Rele (87)   Next in Forum: Applications, Specifications and Ratings of Staters
You might be interested in: Stock and Strip Feeders, Solids Feeders, Parts Feeders

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 (48 right now)
Show Members
Advertisement