Noise measurement in high voltage laboratory by using high frequency current transformer and loop antenna

This paper discusses about noise measurement in the high voltage laboratory by using high frequency current transformer (HFCT) and loop antenna. This paper explains how to measure the noise characteristics by using two sensors: HFCT and loop antenna. The measurement of noise characteristics was based on the measurement of background noise when the power source of the experiment system is off. The experiment is intended to determine the amount of noise which naturally appears in the observed system. The background noise measurement was highly dependent on the environmental conditions while doing experiment. The level of the noise in pico coulomb(pC) was determined based on the calibration results of the relation between the charge (pC) injected by pC Calibrator and the maximum voltage (Vmax) measured by using HFCT. It is observed that the highest noise detected by HFCT was 12.8 mV or 13.62pC which was detected on Thursday at 10:00AM while the lowest noise detected by the same HFCT was 2.4 mV or 2.55pC which was measured on Friday at 15:00. The highest noise detected by loop antenna was 13.8mV which was detected on Monday at 09:00 while the lowest noise detected by the loop antenna was 2.6mV which was measured on Tuesday at 09:00. In general it appears that the HFCT is more sensitive in measuring the noise than the loop antenna.