11 kV Cable

I have a circuit in which the the transformer is of rating

 - 11kV / 415V, 50Hz, 1600kVA, Dyn11, 5% impedance connected to a 12kV, 50Hz ,630A indoor VCB with a 3cx70mm² 11kV cable.

The short circuit breaking current (AC RMS) rating of VCB is 31.5kA for 3 second.What should be the short current rating and time duration  of the 11kV cable ?


asked 12/23/2013
ram3166
ram31

1 Answer

http://www.engineering.schneider-electric.se/Attachments/ed/guide/06_determining_conductor_cross_sectional_areas.pdf

 

This link will be helpful for you. Page 544 is the right one for your question and equation is from IEC standard. Now, your question is a little bit unclear because time duration and current withstand capacity of cable are in direct proportion so usually u have to first take in consideration time for withstanding and than u will get current value and vise versa. Just read the document and if u have any question, don't hesitate to ask.

answered 12/23/2013 Mirko Lezajic 8
Mirko Lezajic

Your Answer

In order to provide an answer to this question, you must Login

I am flagging this question because...




10 inform moderator flags remaining

I am deleting this question because...




I am flagging this answer because...




10 inform moderator flags remaining

Flagging a Post

You have already flagged this post. Clicking "Remove Flag" below will remove your flag, thus reducing the count by one as well.

I am deleting this answer because...





Back to basics - the Watt (or kW)

When thinking about watts (W) or kilowatt (kW = 1000 W) it can be useful too keep in mind the fundamental ideas behind the unit. Watt is not a pure electrical...

Copyright Infringement

myElectrical does not support or promote the use of copyrighted material without the copyright owner's consent. If you believe that material for which...

Large Hadron Collider

The 27 km, Euro 6 billion  Collider lies on the border between France and Switzerland, took nearly 30 years to complete.  Some of the lofty goals for the...

How to Size Power Cable Duct

Some colleagues had an issue earlier in the week on sizing conduits to be cast in concrete for some power cables . It became clear that none of us had...

Why use catalogues

I'm a fan of using manufacturers catalogues. There are two main reasons for this. Firstly, if your involved in the purchase of equipment, you will likely...

Frame Leakage Protection

While not as popular as it once was, frame leakage protection does still have some use in some circumstances.  In essence frame leakage is an earth fault...

Electromagnetic Fields - Exposure Limits

Exposure to time varying magnetic fields, from power frequencies to the gigahertz range can have harmful consequences.  A lot of research has been conducted...

Cables for MV Power Distribution - Earthed versus Unearthed Systems

Power cables can basically be classified into earthed and unearthed cables, where earthed and unearthed refer to the application for which the cable is...

Microsoft OneNote

A couple of months ago I came Microsoft's OneNote and downloaded the 60 day free trail. Since then I have been using it regularly and now have a full license...

Induction Motor Calculator

Just added a page to the tools, which will allow you to calculate the synchronous speed, slip and rated torque for an induction motor. Not a particularly...

Our website uses cookies so that we can provide a better experience.
To learn more about what cookies are and how to manage them visit AboutCookies.org