The Engineer's Place for News and Discussion®

 Previous in Forum: Cables and Lugs Next in Forum: Supply Connection of Coil

### Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

### Rating Vote:

Active Contributor

Join Date: Sep 2010
Posts: 20

### Coil Connection

10/17/2012 7:56 AM

if both ends of a coil connected to two different phases of supply say R and Y.Then what will be the result?

Interested in this topic? By joining CR4 you can "subscribe" to
Guru

Join Date: Dec 2008
Location: Cd. Juarez, Chihuahua, Mexico.
Posts: 654
#1

### Re: coil connection

10/17/2012 8:02 AM

You will get 1.73 times the line-to-neutral voltage applied across it.

__________________
No hay conocimiento ni herramienta que sustituya al sentido comun.
Guru

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing. Kettle's on.
Posts: 19628
#2

### Re: Coil Connection

10/17/2012 8:43 AM

...and the result will depend upon the voltage between the phases and the voltage rating of the coil, neither of which have been shared with the forum.

__________________
There was a time, not long ago, when people were smarter than their phones... (tips hat to CR4 user Harley.)
Guru

Join Date: Sep 2006
Location: California, USA, where the Godless live next door to God.
Posts: 3429
#3

### Re: Coil Connection

10/17/2012 10:22 AM

Let's play his game and see how many useless yet true statements we can make from the useless and incomplete information.

3. You will have a completed circuit.

4. Current will flow from R to Y, then from Y to R, changing direction at a rate commensurate with the supply frequency.

__________________
** All I every really wanted to be, was... A LUMBERJACK!.**
Guru

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing. Kettle's on.
Posts: 19628
#4

### Re: Coil Connection

10/17/2012 10:25 AM

5. The B phase may feel left out? Just think of all those poor little electrons, wandering about with no-one to love them.

__________________
There was a time, not long ago, when people were smarter than their phones... (tips hat to CR4 user Harley.)
Power-User

Join Date: Jul 2006
Location: CA (Central Arkansas, USA)
Posts: 284
#11

### Re: Coil Connection

10/18/2012 12:23 PM

And holes! Just because they are empty doesn't mean they have no feelings. -- JHF

__________________
If it's too good to be true, it probably isn't
Guru

Join Date: Dec 2008
Location: Long Island NY
Posts: 7000
#5

### Re: Coil Connection

10/17/2012 1:25 PM

You will have an unbalanced load applied to your three phase power source.

Tonight's homework assignment will be in two parts:

1. Calculate the current flow through R and Y. Make sure to identify the direction of your current direction in your analysis schematic. Current results must be shown in both imaginary and angular measurements.
2. Can one construct a load between B and N using just a resistor and capacitor to make a balanced load for the three phase power source? Can this balanced load appear to be purely resistive to the three phase voltage source?

As usual show all steps in analysis or no credit will be given.

Hint: Include parasitic resistance RL of this coil in your analysis. Assume that the core of your inductor will not saturate. Extra credit will be given for a saturated core analysis.

__________________
"A good scientist is a person with original ideas. A good engineer is a person who makes a design that works with as few original ideas as possible. There are no prima donnas in engineering." Freeman Dyson
Guru

Join Date: Oct 2008
Location: 34° 34' 21.60" N, 92° 55' 42.28" W
Posts: 20969
#6

### Re: Coil Connection

10/17/2012 1:46 PM

6. Be sure to calculate time to failure due to resistance heating of the coil, using the voltage of your choice. Show your work.

__________________
Luck comes and goes. Skill is forever. Intelligence either is, or it ain't. lyn
Guru

Join Date: Aug 2010
Location: Under the Major Oak
Posts: 3054
#7

### Re: Coil Connection

10/17/2012 2:18 PM

what will be the result?

7. A fire!

__________________
Pessimists are rarely disappointed.
Guru

Join Date: Sep 2006
Location: California, USA, where the Godless live next door to God.
Posts: 3429
#8

### Re: Coil Connection

10/17/2012 2:55 PM

Unless the coil is designed for the voltage between R and Y...

8. The coil will create a magnetic field.

__________________
** All I every really wanted to be, was... A LUMBERJACK!.**
Participant

Join Date: Dec 2011
Location: Sydney Australia
Posts: 4
#9

### Re: Coil Connection

10/17/2012 10:46 PM

unless its one of these coils

Power-User

Join Date: Feb 2009
Posts: 143
#10

### Re: Coil Connection

10/17/2012 11:41 PM

probably the same thing as would happen on this post