Measurements and Characterization of the Time Varying Electric and Magnetic Fields at the High Voltage Laboratory

초록

The electomagnetic distubances orginates mainly from ground faults and/or operations of cutoff equipments.The electronic curcuits and control devices are very sensitive to electromagnetic interferances.It is necessary to evaluate the level of interferances for a given electromagnetic environment.The present paper discribes the measurments and FFT analysis of the time-varying electric and magnetic fields induced at the high voltage laboratory.The time-varying magnetic field was measured by means of the loop sensor whose output is directly proportional to the incident signal,and the electric field was observed by the field probe having the range from 40[Hz] to 200[MHz].Also,the frequency components of the time-varying electric and magnetic fields induced by an oscillating transient current and a chopped impulse were analyzed by terms of the fast Fourier transformation,which gives information about the levels of the electromagnetic interferences and the design of the electromagnetic shielding enclosures.