ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Changing a Bulb
by mbhydro. 07/21/18 05:57 PM
Opinions & comments
by HotLine1. 07/21/18 04:44 PM
Tray cable?
by gfretwell. 07/11/18 10:18 PM
Eaton Heavy Duty 30A and 60A Safety Switches
by Admin. 07/11/18 09:49 PM
ORTOVOX Recalls Avalanche Transceivers
by Admin. 07/11/18 09:44 PM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 26 guests, and 17 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Need a little help #61984
02/07/06 07:19 PM
02/07/06 07:19 PM
S
scjohn  Offline OP
Member
Joined: Jul 2002
Posts: 74
charleston, SC, USA
I have a foreign piece of equipment that is 3 phase 380 volt 23kw with a 60 amp start up and 45 amps running. This equipment came with a step-up or buck & boost transformer that is 30kva with a 3 phase 208 deta for primary and 400/231 y secondary. The problem I have is the building only has single phase 240volt power so I guess I need a phase converter. Is a 30kva converter enough, and what can I expect my load to be on the single phase circuit supplying all this? This piece of equipment is extremely vital and expensive, I don't want to screw it up.
Thanks.

Work Gear for Electricians and the Trades
Re: Need a little help #61985
02/07/06 08:52 PM
02/07/06 08:52 PM
L
Larry Fine  Offline
Member
Joined: Feb 2005
Posts: 693
Richmond, VA
If the converter is rated to supply 30kva, and the load requires 23kw, you're probably okay, but the difference between kW and kva, the ratio being the power factor, could overload the conveter.

The best bet is to contact the converter maker with the specific specifications (is that redundant?) of your equipment for proper application.


Larry Fine
Fine Electric Co.
fineelectricco.com
Re: Need a little help #61986
02/08/06 08:27 AM
02/08/06 08:27 AM
D
Dnkldorf  Offline
Member
Joined: Dec 2004
Posts: 1,064
nowhere usa
scjohn, I did a search here on this site, and there was talk of derating phase convertors, up to 57%....

I have very limited experience with these, but will tell you, rotary convertors put out a high leg, and this should not be used for control circuits. If your equipment is "vital and expensive" as you say, then Larry's advise would be prudent. Contact both, the convertor manufacturer and the equipment manufacturer prior to installation.....


Dnk...

Re: Need a little help #61987
02/08/06 11:15 PM
02/08/06 11:15 PM
S
scjohn  Offline OP
Member
Joined: Jul 2002
Posts: 74
charleston, SC, USA
Actually the step-up transformer that came with it states a 208 delta for a primary. This in itself is confusng me a little. I always thought that a delta was 240volt with a high leg, and 208y was 120volt from each line to ground. The secondary of the transformer is 400/235 y.


Featured:

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

 

Member Spotlight
lil suzi
lil suzi
Midwest
Posts: 57
Joined: August 2003
Show All Member Profiles 
Top Posters(30 Days)
Admin 5
Popular Topics(Views)
248,161 Are you busy
185,637 Re: Forum
175,005 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.019s Queries: 14 (0.003s) Memory: 0.9595 MB (Peak: 1.0895 MB) Zlib enabled. Server Time: 2018-07-22 21:42:13 UTC