Previous in Forum: Testing Auto-Start on a Ship's Emergency Switchboard   Next in Forum: Auxillary Power Sharing
Close
Close
Close
3 comments
Rate Comments: Nested
Associate

Join Date: Sep 2006
Location: San Diego
Posts: 28

Power Distribution in Phase

05/07/2008 11:15 PM

Hi,

Does anybody have drawing samples that reflect the diference between a Power Distribution System that is in phase and one that is out of phase. I am taking about a real life situation not a book example. Perhaps some one could describe an scenario about it. What are some of the events that make a sytem to be out of phase and possible ways to solve such situation in a factory plant or a small shopping center.

Thanks,

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

Join Date: Apr 2007
Posts: 414
Good Answers: 19
#1

Re: Power Distribution in Phase

05/09/2008 3:44 AM

Short answer: Smoke.

Register to Reply
Active Contributor

Join Date: May 2008
Posts: 13
#2

Re: Power Distribution in Phase

05/09/2008 12:19 PM

Systems can be out of phase if the wiring between the different sources have been switched or if one system is supplied by a generator and one is supplied by utility.

Are both phases supplied from Utility?

The voltage will determine the testing methods to be used to if system are out of phase.

__________________
Availalbe for short term contracts, by the hour, day or week to help you be successful.
Register to Reply
Guru

Join Date: Oct 2007
Location: Transcendia
Posts: 2963
Good Answers: 93
#3

Re: Power Distribution in Phase

05/09/2008 11:26 PM

Imagine you have a 3phase distibution system for your draws.

To be in balance each phase would draw the same amount, and the neutral and ground would not be needed.

Imagine that your distribution system was drawing all towards one leg, and nothing was drawing on any other of the two other hots, or grid or curcuit phases.

Anyway the thing to do is make all the feeds feed equally so the neutral does not become a hot. - or too hot.

What you do is add up your set loads and then distribute them between the phases, legs, hots, whatever you want to call them, so you are in balance. The neutral carries around in the circuit what is the out of balance load between the phases.

The scenario is I have a 100 amp draw from a 10 thousand Watt Light on one leg, and a 5K and a 2K on another, and a 500Watt and a 5K and some coffee maker and a hair dryer and lights in the trailer on on another leg so I am out of balance but within ranges the Generator can handle as long as the neutral is hooked up and the ground is solid.

I'm tired and I am rusty, but basically don't ask one leg for all of the service.

__________________
You don't get wise because you got old, you get old because you were wise.
Register to Reply
Register to Reply 3 comments
Copy to Clipboard

Users who posted comments:

bubbapebi (1); tchapman_egr (1); Transcendian (1)

Previous in Forum: Testing Auto-Start on a Ship's Emergency Switchboard   Next in Forum: Auxillary Power Sharing

Advertisement