The CT alyser is an insepensable instument for on- site verication of current tansfomer accuracy. The traditional transformer test method is manily the measurement method. Due to the limitation of the principle, the on-site verification of the current transformer is extremely inconvenient.

We are a professional electrical equipment manufacturer (design and production). Kvtester provides advanced high voltage test equipment and test equipment for electrical systems, scientific research institutions and electrical equipment manufacturers.The technicians of our company verified the ct instrument in this way.

1.Direct law principle

During calibration, the current is required to rise up to 120% of the rated primary current. The standard CT is compared with the tested transformer and the error is measured by the transformer calibrator.

2.Principle of difference measurement

That is, the standard and the secondary current of the CT are sent to the differential circuit of the CT calibrator (ie, the difference circuit), and then the difference obtained by the differential circuit is input to the measurement link for measurement, and finally with the standard transformer. The secondary current comparison yields the difference and angular difference between the CT being tested and the standard CT.