CT Analyzer 1

[CuriousElectron]

Hello,
Has anyone used a CT Analyzer to determine the accuracy class of a current transformer. If metering class and burden data rating were missing, and you knew the ratio of the CT, presumably you could inject current on the primary and measure the secondary to derive current ratio error in % at % rated current at rated burden.
You would then use IEEE Std C57.13 to determine the metering accuracy class of your CT based on where it falls within the table.
Thanks,
EE

 

[thermionic1]

Do you mean the Omicron product called "CT Analyzer", or a CT test set in general? In the dead tank world, CT's are often tested via the voltage method, described in C57.13. This is especially useful if one is testing bushing CT's on a transformer. Testing with current is possible, but consider even a 600:5 ratio and you wanted to test @ 100%. The cables from the source to the device would be huge, along with the current source. If this is a lab / factory scenario, the current method doesn't have the same limitations.

My company owns the Omicron CT Analyzer and we use it mostly for protection CT's, however it has the capability to determine metering accuracy class as well as accuracy class with various burdens.