different currents on the parallel wires of a phase 2

[gaux]

hi, all i got a question that maybe is very easy for electric guys, we have a generator, 400 V 1500 A, and we use 6 wires to get out the current, and i got diferents currents on each wire, i tight them again but it´s not sucesful, and now i don´t know why...we cheek the terminals and all seems to be ok, does somebody know why...
the diference is about 10 % of the current....?

i hope somebody could help me cause i´m worried about some wire will burn.... thanks in advance

 

[PHovnanian]

10% difference might not be worth worrying about. But if you can get your hands on a thermograph, take a quick look at the cable terminations while under load just to make sure that a higher impedance of one of the paralleled conductors isn't due to a bad crimp or tightening torque.

 

[burnt2x]

Good point, PHovnanian!
The first thing I would do on cases like these is to verify good joints. Small contact resistances on any cable termination means a lot, and could explain why current sharing variations are pronuonced.

 

[tonyjony]

Take a look to this document. It's in spanish, but the figure in the Error#1 it's very clear.

It's the recomended array of cables of the same phase running together.

 

[Skokian]

Is the motor paralles wound? E.g.: Does the motor have six separate windings?

Are the motor windings in Wye (Star) or in Delta?

Tx.

Regards . . .

Jim S. Nasby