ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
250.104
by gfretwell. 02/16/19 01:08 PM
PurpleAir Recalls Power Supply Units
by Admin. 02/14/19 08:43 PM
Utility Company Programs
by katty81. 02/14/19 11:11 AM
AFDD's coming to the UK
by Trumpy. 02/14/19 12:29 AM
Delta Electronics Recalls Solar Inverters
by electech. 02/13/19 10:26 AM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 8 guests, and 14 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Standard of voltage unbalance level #129851
09/26/05 09:45 AM
09/26/05 09:45 AM
V
vandax  Offline OP
Junior Member
Joined: Jul 2005
Posts: 4
Sumatra, indonesia
We are operating 3 phases radial system with part of load is 2 phases transformer and some percent of load also use 3 phase load especially for motor /AC or other 3 phases load.

The fact that system loading cause the voltage to be unbalance about 2-3 % of the average voltage value. We know that it may increase the motor temperture excessively, due to presence of negative seq current.

Would please help me or direct me to find the reference what is the acceptable unbalance voltage provided by the utility for customer?

Thanks for your help


gg
Tools for Electricians:
Re: Standard of voltage unbalance level #129852
09/26/05 11:09 AM
09/26/05 11:09 AM
D
Dave T  Offline
Member
Joined: Jan 2005
Posts: 155
Waukesha, WI, USA
My curve shows a 5-10% derating.
This is my referrence: https://img.photobucket.com/albums/v706/templdl/Accessories/Image029.jpg
As shown it is not recommended that more than 5% be allowed.

Re: Standard of voltage unbalance level #129853
10/01/05 09:22 PM
10/01/05 09:22 PM
W
WFO  Offline
Member
Joined: Sep 2005
Posts: 202
Cat Spring, TX


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
sparky66wv
sparky66wv
West Virginia
Posts: 2,236
Joined: November 2000
Show All Member Profiles 
Top Posters(30 Days)
Admin 7
BigB 3
Popular Topics(Views)
253,209 Are you busy
189,866 Re: Forum
179,564 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.017s Queries: 14 (0.004s) Memory: 0.9508 MB (Peak: 1.0743 MB) Zlib enabled. Server Time: 2019-02-16 21:38:34 UTC