Where it begins?
Well, in high-voltage circuits, accurately measuring Partial Discharge (PD) signals is challenging due to distortion from factors like power supply and circuit size.
- Measuring Impedance (or quadrupole)
Converts high-frequency PD current pulses into measurable voltage signals, addressing challenges like low magnitude (pico-to-nano amps) and high-frequency noise. This method simplifies calibration, enhances signal-to-noise ratio (SNR), and avoids invasive current measurements.
- HFCT (High-Frequency Current Transformer)
A non-invasive inductive sensor While effective, it requires integration (analog or digital) to mitigate phase errors and saturation risks from low-frequency currents.
The document outlines three key setups for impedance measurement and comparison of each method;