"Now, without taking anybody out of service, you can
fix a magnetized CT in less than one minute!"
Many of you have measured ratio test reading of a CT
that was not what it should be: For Example, a 200:5
CT that measured out to be 212:5 but passed the
burden test. This is a magnetized CT. And what can
you do about it? Either nothing or change the CT.
Now there is a 3rd option: The Spinlab Demag Circuit
used in tandem with the Bird Dog Plus.
Of the 32 failure modes of a meter circuit,
magnetized CTs are by far the most common ones after
installation errors. A magnetized CT can be caused
by a lighting strike, ground fault, or open
circuiting a CT