CR4 - Thread: NGR Requirement

Home | Electrical Engineering | Electrical Engineering | NGR Requirement

Previous in Forum: Question about inverter

Next in Forum: Screw-Type Compressors for Ammonia Refrigerants

2 comments

Rate this

Comments: Nested

Syed Ziauddin Associate Join Date: Jul 2007 Posts: 36	NGR Requirement 05/07/2008 3:37 AM
	We have a power house of 9.8MW capacity. We are not sure about whether we need to install NGR or not. Some consultant says if your capacity is less than 10MW then there is no need for NGR installation, you just solidly ground your neutral. Can any body help us to know what is the actual criteria for the use/installation of NGRs or is there any standard defined regarding this issue
	Send to a friend Digg this Add to del.icio.us

Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Join CR4, The Engineer's Place for News and Discussion!

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!

#2 "Re: NGR Requirement" by Sudh on 05/10/2008 6:34 AM (score 1)

Electroman Guru Join Date: Jul 2006 Location: Dunstable, England Posts: 2546 Good Answers: 36	#1 Re: NGR Requirement 05/07/2008 7:55 AM
	It depends where you are on this quaint planet of ours...? __________________ Nobody is so blind as those that can not understand

Sudh Active Contributor Join Date: Apr 2007 Posts: 12	#2 Re: NGR Requirement 05/10/2008 6:34 AM
	Hello, The requirement to NGR is to save your system from Heavy earth fault current. It is always advisable to have even High resistance type earthing for NGR, we can solidly ground the system but it will cost heavy breakdown & difficult to locate the earth fault in system. In addition, Selection of NGR is irrespective of total plant capacity and must be calculated based on system voltage & Short circuit calculation of the system. It is must for all systems, which is on high voltage side and may damage the system in case of earth fault. -- Regards, Sudhir
	Score 1 for Good Answer

No more "Almost" Good Answers.

2 comments

Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Join CR4, The Engineer's Place for News and Discussion!

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!

#2 "Re: NGR Requirement" by Sudh on 05/10/2008 6:34 AM (score 1)

Previous in Forum: Question about inverter

Next in Forum: Screw-Type Compressors for Ammonia Refrigerants

You might be interested in: Fire Protection Services, Bar Code Scanners, Slot Card, Printed Circuit Board (PCB) Fabrication Services

"Life is like an ever-shifting kaleidoscope -- a slight change, and all patterns alter." -- Sharon Salzberg

All times are displayed in US/Eastern (EDT) (Register to change time zone)

©2005-2008 GlobalSpec. All rights reserved.
GlobalSpec, the GlobalSpec logo, SpecSearch, The Engineering Search Engine
and The Engineering Web are registered trademarks of GlobalSpec, Inc.
CR4 and Conference Room 4 are registered trademarks of GlobalSpec, Inc.
No portion of this site may be copied, retransmitted, reposted, duplicated or
otherwise used without the express written permission of GlobalSpec Inc.
350 Jordan Rd, Troy, NY, 12180

	Got Something to Say?

	Search this Forum
	Electrical Engineering:

	Search all of CR4

CR4 Sections

	Automotive
	BioMech & BioMed
	Chemical & Material Science
	Civil Engineering
	Communications & Electronics
	Education
	Electrical Engineering
	General
	Instrumentation
	Manufacturing
	Mechanical Engineering
	New Technologies & Research
	Software & Programming
	Sustainable Engineering