High voltage insulation monitoring sensor
First Claim
1. 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.
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Accused Products
Abstract
A sensor for condition monitoring the high voltage insulation of an electrical, generation, transmission or distribution system and/or an item of plant is described. The sensor comprises an impedance measurement unit that connects directly, via a single point of connection, to the electrical system to be tested. The electrical components of the impedance measurement unit are arranged so that high frequency partial discharge signals and low frequency power cycle information signal are preferentially transmitted through separate branches. Analysis of these separated signals thus enables extraction of information about the insulation of the electrical system being monitored. Safe operation of the sensor for users is also achieved through an opto-electronic circuit being employed to control the impedance measuring unit.
33 Citations
25 Claims
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1. A high voltage insulation monitoring sensor for condition monitoring the high voltage insulation of an electrical system, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification