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Relay Selection Guide
Relay Selection Guide

Costs of the energy

Power distribution systems serving industrial or commercial facilities represent a variety of costs to the owner. Obviously, the capital cost of the equipment is a concern, as is the cost of the energy which that power system delivers to the loads which convert electrical energy to a saleable product or service.

There are some less obvious costs – the cost or reliability, measured in products or services which cannot be sold because power is unavailable, or an even more illusive concept, the cost of quality, which relates to customer satisfaction.

Ultimately, as the designer of the system struggles with devising a system arrangement and choosing equipment, he must face the reality that no matter how clever he is, no matter how much redundancy he builds into the system, and no matter how much he pays for premium quality components, he simply cannot build a system which will never fail.

Minimum protection for a small machine with low resistance grounding
Minimum protection for a small machine with low resistance grounding

This is where system protection, and protective relays become important. If component failure is inevitable, then it is necessary to provide a means of detecting these failures.

Better and faster protection afford a number of desirable attributes, all of which ultimately result in saving the owner of the system money through cost avoidance.

When component distress is detected and corrected earlier, the damage associated with the failure is minimized, which results in lower repair costs (or even the ability to repair versus the need to replace). At the same time, faster and more sensitive detection of problems means that the cause of the problem can be corrected while it is still a minor problem, and before it escalates into a major catastrophe.

Title:Relay Selection Guide – GE Power Management
Size:250 KB
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Relay selection guide
Relay selection guide

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  1. shahbaz hussain
    Mar 28, 2019

    Thank you So much EEP. I found very valuable information for Selection of Relays.

  2. Mostafa Maher
    Apr 02, 2015

    It’s a fascinating website
    Thank you

  3. farhad
    Mar 09, 2015

    How can i download pdf books?
    When i click on the download tab it doesn’t do nothing.

  4. Shoaib Ahmed
    Jun 05, 2014

    Can you please explain me about transformers neutral grounding, and why auxiliary transformers are Earthed through NGR and not solidly Earthed?
    where as grid side HT transformers & distribution transformers are solidly earthed?

  5. feny Kajar
    Apr 11, 2014

    Hi,guys how is the best effective way to understand circuits. I have a certificate as electrician (distance learning ) but when it comes to troubleshooting faulty circuits i got stuck.
    I work mostly with restaurant and bakery equipment as ovens, dough mixers, bagel formers etc.I would appreciate any advice.My goal is be a good troubleshooter.

  6. henry02
    Jun 03, 2013

    Thanks a lot for good information.

  7. sajjad
    Dec 25, 2010

    EEP supplies valuable engineering information

  8. sajjad
    Dec 25, 2010

    i like so much EEP

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