Many of you have seen a 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?
Wither nothing or change out the CT. Noe
there is a third 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.
With this shoebox size device, you
simply attach the duckbill connector to
the phase of the test switch you want to
demagnetize, turn the unit 'On' press
the 'Demag button', and in less than 60
seconds your CT will be demagnetized. It
is that easy, and you don't have to take
anything out of service! Never has
increasing the accuracy of a CT-metered
site been easier.