Star Conexion Terminals Burnt
Star Conexion Terminals Burnt
(OP)
Hi there!
After one year of new motor pumps operation, I have found 3 of 6 motors (with the same submergible pump) with 2 phases of 3 with terminal burnt in the conection of star, I have read phase insulation and it´s good and similar comparing with good ones. Some data is 44 kW, 80 A (plate), 70 A operation.
Thanks in advance
After one year of new motor pumps operation, I have found 3 of 6 motors (with the same submergible pump) with 2 phases of 3 with terminal burnt in the conection of star, I have read phase insulation and it´s good and similar comparing with good ones. Some data is 44 kW, 80 A (plate), 70 A operation.
Thanks in advance





RE: Star Conexion Terminals Burnt
" wiht 2 phases of 3 with terminal burnt in the conection of star"??
Do you have all three phase wires connected to the motor?
Did two of the three terminals and the star terminal burn out?
RE: Star Conexion Terminals Burnt
It apears to be due to a high resistance connection, please explain with more detail your findings.
RE: Star Conexion Terminals Burnt
Motor is connected in star, the terminals wich are adjusted by plates and nuts were good fixed, I have found only 2 cables and terminals with signs of high temperarture, cable insulation were burned in 2 inches, in service I took 57 C of temperatura in these terminals. Motor temperature is 50 C, well we will change the motor to check inside.
Aolalde: I hope that this clarify the landscape.
RE: Star Conexion Terminals Burnt
aoladle, is right.
Burnt terminal wires usually due to high resistance connection, that is; obviously a poor or loose connection.
yulinios,
" ..in service I took 57 C of temperatura in these terminals. Motor temperature is 50 C,.."
I wonder how you took this temperature while your submersible pumps were inaccessible - submerged. How you do it?
Actually when we test run this machine after such repair, we soak it down to the pit as though it is completely submerged and evidently the temperature is unaccountable unless an emmbedded temperature sensor is installed.
RE: Star Conexion Terminals Burnt
In a fixed bridge on a block with good connections I could only imagine that you possibly have a reverse phase or similar. IE the labouring 2 phases would burn out under higher load trying to compensate for the reverse phase. This could only be a connection problem or a design problem.
Cheers
RE: Star Conexion Terminals Burnt
Connection - even though the star is neutral, full winding current still flows in and out of it along the leads connected to it - only the node sums to zero, not the physical connections.
RE: Star Conexion Terminals Burnt