Frequency Spectrum Analysis of Radiated Partial Discharge Signals

Partial discharge is measured simultaneously using free-space radiometry (FSR) and a contact measurement technique based on the IEC 60270 standard. The PD source is a specially constructed emulator of the floating-electrode type. The power supply applied to the source is DC. The radiated signal is captured using a biconical antenna and the frequency spectrum is obtained by FFT analysis of time-domain pulses. The relative spectral densitiesin the frequency bands 50 MHz - 290 MHz, 290 MHz
- 470 MHz and 470 MHz – 800 MHz are determined.