Demagnetization Circuit for a Magnetized CT

"Now, without taking anybody out of service, we can fix a magnetized CT in less than 1 minute!"


CT Demagnetization Circuit--600-DMG1
Before Demag--Ratio 212.4		After Demag--Ratio 200.2

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? Either nothing or change out 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 lightning 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 1 minute 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. Here’s more about the Demag circuit:

Works on any CT-rated site—primary or secondary
Works on secondary current from 0.2 to 10 amps
Safety lockouts built in for excessive current, voltage, and temperature readings
Interfaces directly to the Bird Dog Plus for easy before and after monitoring to prove results
Compact size and weight allows you to carry it easily from site to site
Automatically predetermines the extent of the test needed to demagnetize a CT based on load and degree of magnetization
Demagnetizes a CT normally in less than 1 minute
No batteries to maintain—works from site power

(For a Printable Demagnetization Circuit Flyer in .pdf Format Click Here)

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contact our Sales Force at 865 212 9881

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Spinlab Utility Instrumentation, Inc. / 3110 Henson Road, Suite A1 / Knoxville, TN 37921