Partial discharge monitoring method and system
First Claim
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1. A method of monitoring partial discharges occurring in an electrical system, the method comprising:
- receiving a pulse from the electrical system;
identifying if the pulse is noise or a duplicate pulse;
if the pulse is not noise or a duplicate pulse then converting the pulse from an analogue to a digital signal;
breaking the pulse into two or more predefined frequency components;
normalizing the two or more predefined frequency components to a maximum level;
comparing the amplitudes of the two or more normalized predefined frequency components associated with the received pulse with amplitudes of other stored pulses at the same predefined frequency components to identify similar pulses which indicate a known fault condition;
if the pulse is identified as a pulse which indicates the known fault condition, then storing data in a database associating the pulse with the two or more normalized predefined frequency components and the known fault condition;
grouping pulses with similar normalized predefined frequency components in a scatter plot stored in the database;
if the normalized predefined frequency components of the pulse are not similar to the normalized frequency components of a current grouping then creating a new grouping of pulses stored in the database; and
if the pulse is identified as a pulse which indicates the known fault condition, then notifying a user that the fault condition exists.
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Abstract
The invention relates to a method and system of monitoring partial discharges occurring in an electrical system, and to a method of measuring or analyzing partial discharges occurring in an electrical system. The method comprising receiving a signal or impulse, or information associated therewith, from the electrical system; breaking the received signal or impulse into predefined frequency components; and displaying a peak of the received signal or impulse on a scatter plot with other peaks associated with similar predefined frequency components.
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Citations
12 Claims
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1. A method of monitoring partial discharges occurring in an electrical system, the method comprising:
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receiving a pulse from the electrical system; identifying if the pulse is noise or a duplicate pulse; if the pulse is not noise or a duplicate pulse then converting the pulse from an analogue to a digital signal; breaking the pulse into two or more predefined frequency components; normalizing the two or more predefined frequency components to a maximum level; comparing the amplitudes of the two or more normalized predefined frequency components associated with the received pulse with amplitudes of other stored pulses at the same predefined frequency components to identify similar pulses which indicate a known fault condition; if the pulse is identified as a pulse which indicates the known fault condition, then storing data in a database associating the pulse with the two or more normalized predefined frequency components and the known fault condition; grouping pulses with similar normalized predefined frequency components in a scatter plot stored in the database; if the normalized predefined frequency components of the pulse are not similar to the normalized frequency components of a current grouping then creating a new grouping of pulses stored in the database; and if the pulse is identified as a pulse which indicates the known fault condition, then notifying a user that the fault condition exists. - View Dependent Claims (2, 3, 4, 10, 11, 12)
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5. A system for monitoring partial discharges occurring in an electrical system, the system comprising:
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a database for storing a plurality of fault spectra; a monitoring module for monitoring the electrical system to receive pulses occurring in the electrical system; and an analog to digital converter to convert the pulse from an analog signal to a digital signal; a validation module arranged to validate the received pulse by identifying if the pulse is noise or a duplicate pulse; a peak detector to determine a peak value of the received pulse; a frequency spectrum generating module operable to generate a frequency spectrum of the pulse received by the monitoring module by breaking the pulse into two or more predefined frequency components; a normalizing module arranged to normalize the peak values of each of the two or more predefined frequency components of the received pulse to a maximum level; a comparator operable, once a pulse is received, to; compare the amplitudes of the two or more normalized predefined frequency components associated with the received pulse with amplitudes of other stored pulses at the same predefined frequency components to identify similar pulses which indicate a known fault condition; if the pulse is identified as a pulse which indicates the known fault condition, then storing data in a database associating the pulse with the two or more normalized predefined frequency components and with the known fault condition; group similar pulses in a scatter plot stored in the database; and a display to display a point on the scatter plot representing the digitized peak of the received pulse together with points representing other identified similar pulse peaks. - View Dependent Claims (6, 7, 8, 9)
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Specification