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# Medium Voltage Design Guide

## Prefabricated metal-enclosed switchgear

In order to design a medium-voltage cubicle, you need to know the following basic magnitudes: Voltage, Current, Frequency and Short-circuit power. The voltage, the rated current and the rated frequency are often known orÂ can easily be defined, but how can we calculate the short-circuit power orÂ current at a given point in an installation?

Knowing the short-circuit power of the network allows us to choose theÂ various parts of a switchboard which must withstand significantÂ temperature rises and electrodynamic constraints.

Knowing the voltageÂ (kV) will allow us to define the dielectric withstand of the components (E.g.: circuit breakers, insulators, CT)

Disconnection, control and protection of electrical networksÂ is achieved by usingÂ switchgear. Metal enclosed switchgear is sub-divided into three types:Â metal-clad,Â compartmented andÂ block.

### Short-circuit power

The short-circuit power depends directly on the network configuration and the impedance of its components: lines, cables, transformers, motors… through which the short-circuit current passes.Â It is the maximum power that the network can provide to an installation during a fault, expressed in MVA or in kA rms for a given operating voltage.

The customer generally imposes the value of short-circuit power on us because we rarely have the information required to calculate it. Determination of the short-circuit power requires analysis of the power flows feeding the short-circuit in the worst possible case.

Possible sources are:

1. Network incomer via power transformers.
2. Generator incomer.
3. Power feedback due to rotary sets (motors, etc);Â or via MV/LV transformaters.
 Title: Medium Voltage Technical Guide // Basics for MV cubicle design – Schneider Electric Format: PDF Size: 2.0 MB Pages: 84 Download: Right here | Video Courses | Membership | Download Updates

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1. Shabbir Ahmed Malik
Mar 24, 2017

Kindly cascade my personal gratitude to “Schneider Team” who put in their lot endeavor for integration of basic knowledge for design of MV switchgear and sharing to their associated esteemed customers and in particular to craving electrical professionals. Its really appreciable and indeed a very useful guide / hand book for day to day application.

Shabbir Ahmed Malik,
Manager Electrical
ICI Pakistan Ltd
Khewra,
Distt: Jhelum
Pakistan

2. Alberto M. Rosillo
Mar 06, 2017

Thank you very for the very informative items that ive been downloaded.

3. mohamed salama hassan
Sep 13, 2015

lot of thanks for this book its very useful using

4. Cahyo Sumarmo
Aug 18, 2015

Jun 17, 2015

Thanks for the E-book version

6. saravanakumar.p
Apr 27, 2015

Thanks for sharing this e-book.

Jan 27, 2015

Thanks for your contribution to the growth of the profession.

8. Ali
Jan 08, 2014

Thank you Edvard for your contribution to the electrical engineering knowledge distribution

9. Jean-Marc Biasse
Dec 11, 2013

A new version of MV Design Guide by Merlin Gerin has been issued.
It is called now: Medium Voltage Technical Guide describing Basics for MV cubicle design by Schneider Electric. http://www2.schneider-electric.com/sites/corporate/en/customers/panelbuilders/technical-guides.page

• Edvard
Dec 11, 2013

Thank you very much Jean-Marc! I’ll update this page with new version.

10. habeb
Nov 17, 2013

Thank you for sharing this ebook.