Device and method for detecting and processing signals relating to partial electrical discharges
First Claim
1. A device for detecting and processing signals relating to partial electrical discharges in an electrical apparatus powered by a square-wave voltage modulated by a modulating wave in such a way as to form an alternating voltage of predetermined frequency, comprising:
- a sensor connectable to the apparatus for detecting a discharge signal representing the electrical pulses generated by the partial discharges;
a processing unit connected to the sensor to receive the discharge signal and derive the detection instants of each of the pulses detected with respect to a predetermined time reference,wherein the device comprises;
a synchronization module, designed to receive an electrical synchronization signal representing the power supply voltage and equipped with a filter configured for extracting from said power supply signal a signal representing the modulating wave, wherein the synchronization signal received from the synchronization module has a first contribution, relative to a square-wave voltage, and a second contribution, relative to the modulating wave and providing an alternating signal at said predetermined frequency lower than the frequency of the square-wave voltage, wherein the filter is configured for extracting said second contribution at said predetermined frequency;
a voltage divider connected across the power supply and the filter,wherein the processing unit is configured for associating with the pulses detected the values of a phase parameter representing the phase of the modulating wave at the pulse detection instants.
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Accused Products
Abstract
A device (1) for detecting and processing signals relating to partial electrical discharges in an electrical apparatus (2) powered by a square-wave (3) voltage modulated by a modulating wave (4) in such a way as to form an alternating voltage of predetermined frequency, comprises: a sensor (5) connectable to the apparatus (2) for detecting a discharge signal (6) representing the electrical pulses generated by the partial discharges; a processing unit (7) connected to the sensor (5) to receive the discharge signal (6) and derive the detection instants of each of the pulses detected with respect to a predetermined time reference, a synchronization module (8) designed to receive an electrical signal (9) representing the power supply voltage and equipped with a filter (10) configured for extracting from said power supply signal (9) a signal (11) representing the modulating wave (4), the processing unit (7) being configured for associating with the pulses detected the values of a phase parameter (f) representing the phase of the modulating wave (4) at the pulse detection instants.
9 Citations
10 Claims
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1. A device for detecting and processing signals relating to partial electrical discharges in an electrical apparatus powered by a square-wave voltage modulated by a modulating wave in such a way as to form an alternating voltage of predetermined frequency, comprising:
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a sensor connectable to the apparatus for detecting a discharge signal representing the electrical pulses generated by the partial discharges; a processing unit connected to the sensor to receive the discharge signal and derive the detection instants of each of the pulses detected with respect to a predetermined time reference, wherein the device comprises; a synchronization module, designed to receive an electrical synchronization signal representing the power supply voltage and equipped with a filter configured for extracting from said power supply signal a signal representing the modulating wave, wherein the synchronization signal received from the synchronization module has a first contribution, relative to a square-wave voltage, and a second contribution, relative to the modulating wave and providing an alternating signal at said predetermined frequency lower than the frequency of the square-wave voltage, wherein the filter is configured for extracting said second contribution at said predetermined frequency; a voltage divider connected across the power supply and the filter, wherein the processing unit is configured for associating with the pulses detected the values of a phase parameter representing the phase of the modulating wave at the pulse detection instants. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for detecting and processing signals relating to partial electrical discharges in an electrical apparatus powered by a power supply with a square-wave voltage modulated by a modulating wave in such a way as to form an alternating voltage of predetermined frequency, the method comprising the following steps:
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connecting a sensor to the apparatus for measuring a discharge signal representing the electrical pulses generated by the partial discharges; deriving, at a processing unit connected to the sensor, the detection instants of each of the measured pulses relative to a predetermined time reference; wherein it further comprises the following steps; providing a filter and voltage divider connected across the power supply and the filter; receiving at the filter a synchronization signal representing the power supply voltage and having a first contribution, relative to a square-wave voltage, and a second contribution, relative to the modulating wave and providing an alternating signal of predetermined frequency lower than the frequency of the square-wave voltage, extracting the modulating wave from said electrical synchronization signal, through an extraction at the filter of said second contribution at said predetermined frequency; associating the measured pulses with values of a phase parameter representing the phase of the modulating wave at the pulse detection instants. - View Dependent Claims (8, 9, 10)
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Specification