I have been called with a question about motors. Motors are not my specialty.
I found this site with pictures:
http://globuselectric.com/motorfailure.htm
The pictures that I was sent look most like the locked rotor picture. In fact, I think you could exchange the pictures and nobody would know which is which.
The situation is that there are three separate pump stations all within a couple of miles of each other. They are three of 11 or so. They each burned up on different days when there has been no lightning. All are served by hi-leg delta. The two transformer turning single phase to three phase kind. One of the motors has been there for years. The other two have been there for months.
The overloads on the two motors that have been there for months were not sized properly, they are too big.
They are pumping from groundwater 12' or so below the surface. We are in Indiana. This happened recently in this unusual cold. Don't know if that has anything to do with it.
The two motors that have been operating for months have TVSS protection. The other one did not.
Any idea as to causes?
Thank you.
I found this site with pictures:
http://globuselectric.com/motorfailure.htm
The pictures that I was sent look most like the locked rotor picture. In fact, I think you could exchange the pictures and nobody would know which is which.
The situation is that there are three separate pump stations all within a couple of miles of each other. They are three of 11 or so. They each burned up on different days when there has been no lightning. All are served by hi-leg delta. The two transformer turning single phase to three phase kind. One of the motors has been there for years. The other two have been there for months.
The overloads on the two motors that have been there for months were not sized properly, they are too big.
They are pumping from groundwater 12' or so below the surface. We are in Indiana. This happened recently in this unusual cold. Don't know if that has anything to do with it.
The two motors that have been operating for months have TVSS protection. The other one did not.
Any idea as to causes?
Thank you.