Measurement of the dielectric performance of an instrument transformer at different voltage and frequencies

In this study, the capacity, tan delta and dielectric loss of an IVT are measured for different voltage levels and frequency values. The measurement process is realized for the isolation between the primary and secondary windings of a 10kV/0,1 kV nominal rated IVT. As a measurement device, CPC100/CP TD1, which is frequently preferred especially in field applications, is used. Results indicated that, the dissipation factor changes according to the voltage levels. When voltage level gets closer to nominal value or exceeds it, it is seen that tan delta value increases rapidly. Moreover, it is found that the rising frequency has a negative effect on the dielectric loss of the material as a result of the measurements at different frequency values between 50 Hz - 400 Hz.