High-Frequency Current Transformer Design and Implementation Considerations for Wideband Partial Discharge Applications

High-frequency current transformers are popular noninvasive inductive wideband sensors. Despite the simplicity in design and operational principle, implementation of such sensors for partial discharge (PD) applications requires careful consideration, particularly higher frequency range where traveling wave attenuation distortion relevant. First, role variables, including core materials, winding design, shielding practices on sensor sensitivity characteristics (transfer impedance), is presented. Next, suitability constructed PD assessed. The designed suitable laboratory with standard measurement circuits controlled conditions. low-level magnitude spectrum pulses hinders signal integrity relation to placement within circuit, amplification, pulse repetition rate (pulse resolution). To enable most stringent detection levels under 1 pC, efforts needed distortionless amplifier interference mitigation.