Patent ID: 8466690

Claim:
A high voltage insulation monitoring sensor for condition monitoring the high voltage insulation of an electrical system, comprising: an impedance unit adapted to separate discharge signals and power cycle information to enable measurement of the partial discharge signals and the power cycle information, wherein the impedance unit comprises: an input channel directly electrically coupled to the electrical system for receiving an input voltage signal from the electrical system; a first branch containing a first set of electrical components which exhibit a first impedance to one or more partial discharge signals contained within the input voltage signal and which exhibit a third impedance to a power cycle information signal contained within the input voltage signal; and a second branch, electrically parallel to the first branch, comprising a second set of electrical components that exhibits a second impedance to the one or more partial discharge signals contained within the input voltage signal and exhibits a fourth impedance to the power cycle information signal, wherein a magnitude of the first impedance is greater than a magnitude of the second impedance such that the one or more partial discharge signals are transmitted through the second branch and a magnitude of the fourth impedance is greater than a magnitude of the third impedance such that the power cycle information signal is transmitted through the first branch; and wherein the first set of electrical components of the first branch comprise an inductor and capacitor in series, the second set of electrical components of the second branch comprise a multiple order bandpass filter, further wherein the inductor and capacitor, in combination with the multiple order bandpass filter, provide an overall bandpass filter to integrate the one or more partial discharge signals such that the second branch provides a measure of the apparent charge of the one or more partial discharge signals, and wherein the power cycle information signal is in phase with the input voltage signal in the first branch.