bus zone protection is a unit protection meaning a protection with a restricted zone therefore does not need to be coordinated with other time based protections . Course Overview. This course is intended to assist the user to find their way around the schemes that are supplied by Powertech SI to ESKOM. The schemes . When we examine electrical protection schemes, the best place to start is with electrical bus protections – overcurrent, differential, undervoltage.

Author: Moogushura Gur
Country: Samoa
Language: English (Spanish)
Genre: Technology
Published (Last): 13 December 2006
Pages: 82
PDF File Size: 19.47 Mb
ePub File Size: 4.67 Mb
ISBN: 858-6-52847-210-8
Downloads: 28371
Price: Free* [*Free Regsitration Required]
Uploader: Mezihn

Good revision and informative. The differential relay is fed by CTs on the outside of the protected bus. Please read those terms and protectionn carefully. By Subhro Roy on 7 May, – A special type of CT having no iron core, also known as the linear coupler is sometimes employed to prohection the difficulties of an iron cored CT.

In fact, many times the decision’s made to omit bus zone protection. Please refer to the litrature of MCAG. Regards, Phil Corso, PE cepsicon aol. You must be a Control.

What is the difference between check zone and bus zone in busbar protection?

These are numerical protection relays. It’s usefully because it prevents external faults to be considered as a busbar fault.


This is standard notation that Amps in the primary will produce 5 Amps on the secondary. By kevinr on 6 May, – 1: Electrical Grounding Techniques Read: Mainly the selection of zone should be overlapping each other.

Davies book on industrial power systems.

Busbar protection or bus zone protection includes, besides bus itself, the apparatus such as circuit breakers, disconnecting switches, instruments, transformers etc. What is the meaning of danger Zone while proection food operations?

Fortune “We want to create puppets that pull their own strings. My Question is New. For low-voltage buses Help keep our servers running It provides stability in case of problems with disconnectors auxiliary contacts stuck contacts or wiring problems.

MEP is protectlon concept in every client organization who dealing with projects fir Danger zone in food processing apply where the chemicalbiochemicalmicrobiological reaction are at h The desirable features of bus zone protection include the following:.

It’s free, and you can customize the content you view, as well as being able to subscribe pfotection threads and topics, getting new posts delivered to your email as they appear. The content is copyrighted to EEP and may not be reproduced on other websites.


Discrimination between faults in its own protective zone and faults elsewhere.

You have clicked on the “? Difficulty arises from the fact that there are many pit-falls. Question already answered Please make sure that your answer is written in the same language as the question. If any fault, either a phase to phase fault or phase to earth fault occurs in the systems, the sum of these currents will not be zero and some current will flow through the relay and causes the relay to operate and isolate the faulty section.

Premium Membership Get access to premium electrical guides, technical articles and much more! Your use of this site is subject to the terms and conditions set forth under Legal Notices and the Privacy Policy.

Bus Zone Protection and Causes of Busbar Faults – My Tech Info

If you’re not already a member, consider joining. John, the basic protection scheme used is measurement of differential-current. Disconnectors positions are not required.