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, comprisingan impedance measuring unit wherein the impedance measuring unit comprises:
- an input channel 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
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,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 preferentially transmitted through the second branch.
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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.
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Citations
26 Claims
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1. A high voltage insulation monitoring sensor for condition monitoring the high voltage insulation of an electrical system, comprising
an impedance measuring unit wherein the impedance measuring unit comprises: -
an input channel 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 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, 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 preferentially transmitted through the second 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, 26)
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Specification