3 Phase Zero Sequence Current, What happens when.... - Page 2 - Electrician Talk - Professional Electrical Contractors Forum
Go Back   Electrician Talk - Professional Electrical Contractors Forum > Electrical Forum > General Electrical Discussion

View Poll Results: What is the zero sequence current with one phase lost?
Zero 6 60.00%
100 amps 3 30.00%
173 amps 0 0%
200 amps 0 0%
300 amps 0 0%
346 amps 0 0%
Who the hell knows? 1 10.00%
Voters: 10. You may not vote on this poll

Thread Tools Display Modes
Old 02-08-2015, 11:50 PM   #21
Bilge Rat
Join Date: Aug 2007
Location: Fernley, Nevada (near Reno)
Posts: 7,012
Rewards Points: 6

Assuming no ground faults, the current measured around all 3 or any 2, or even 1 phase conductors will be equal to the current in the neutral.

In your scenario, if the neutral is outside the zero sequence CT, the CT would read 100 amps.

I've seen this on a fairly large number of factory assembled switchboards. Some were not easy to correct.
micromind is offline   Reply With Quote
Join Contractor Talk

Join the #1 Electrician Forum Today - It's Totally Free!

ElectricianTalk.com - Are you a Professional Electrical Contractor? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's the leading place for electricians to meet online. No homeowners asking DIY questions. Just fellow tradesmen who enjoy talking about their business, their trade, and anything else that comes up. No matter what your specialty is you'll find that ElectricianTalk.com is a great community to join. Best of all it's totally free!

Join ElectricianTalk.com - Click Here JOIN FOR FREE

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ElectricianTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

Sponsored Links
Old 02-09-2015, 06:35 AM   #22
Retired Account
Join Date: Mar 2011
Location: the Green Mountain state
Posts: 39,722
Rewards Points: 14,650

So what if there's no noodle , say an open delta....

we have a positive peak @ 120 for two phases vs. three ....

theoretically, every 120 out of 1/60th a sec there's no negative to balance it all

so where does that emf go? ~CS~
chicken steve is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Ballast Lighting: Could phase sequence matter? theForce Commercial Electrical Forum 34 03-26-2013 02:12 AM
current and voltage out of phase Gary Ray General Electrical Discussion 22 05-11-2011 08:17 AM
3 phase motor current readings farlsincharge PLCs, VFDs, Motors and Controls 13 02-24-2011 03:18 AM
Zero Sequence Current Measurements ohmontherange General Electrical Discussion 15 06-29-2009 09:59 PM
Phase sequence indicator seo Workplace Safety 7 01-31-2009 06:20 AM

All times are GMT -4. The time now is 07:32 AM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Our Pro Sites Network
ContractorTalk.com | DrywallTalk.com | HVACSite.com | PaintTalk.com | PlumbingZone.com | RoofingTalk.com