A broad-band network for power-line disturbance voltage measurements

This paper discusses the design and realization of a broad band network and its application to a voltage probe for monitoring the disturbance on the ac power line, including the very low-frequency components above the fundamental 50- or 60-Hz frequency. The circuit is capable of monitoring frequencies from a few hundred hertz up to well beyond 200 MHz. The very large bandwidth is obtained by paralleling the basic steep-skirt high-pass filter structure with a high-frequency pass-over branch. The basic characteristics such as in-band attenuation, power-frequency rejection, impedance, and dimensions, compare satisfactorily with existing voltage probes having much larger low-frequency cutoff. © 1988 IEEE