INSULATION DIAGNOSTIC UNIT AND ALGORITHM FOR ELECTRIC MACHINE, AND EQUIPMENT INCLUDING THE DIAGNOSTIC UNIT
First Claim
1. An insulation diagnostic unit for an electric machine comprising:
- a sensor disposed near an electric machine;
an instrument that performs spectrum analysis on an output of the sensor;
a load detection method for the electric machine;
a data table in which an output of the load detection method and an output of the spectrum analysis instrument are recorded;
a first routine that notes a spectrum relevant to a specific frequency, which is obtained by the spectrum analysis instrument, from among data items recorded in the data table, and obtains a correlation coefficient on the basis of a plurality of data items concerning magnitudes of the noted spectrum, and a plurality of data items of a load obtained at the times of measurement of the plurality of data items; and
a second routine that classifies the noted spectrum relevant to the specific frequency into a spectrum of an environmental electromagnetic wave or a spectrum of an electromagnetic wave due to partial discharge from the electric machine on the basis of the value of the correlation coefficient obtained by the first routine.
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Accused Products
Abstract
Partial discharge occurring in a continuously operated electric machine is monitored all the time. Even when the electric machine is mounted in mobility equipment, the partial discharge is monitored all the time. An insulation diagnostic unit includes: an instrument that performs spectrum analysis on an output of a sensor disposed near the electric machine; a data table in which an output of a load detection method for the electric machine and an output of the spectrum analysis instrument are recorded; a first routine that obtains a correlation coefficient on the basis of plural data items concerning the magnitudes of a spectrum relevant to a specific frequency, which is obtained by the spectrum analysis instrument, out of data items recorded in the data table, and plural data items of a load obtained at the times of measurement of the plural data items; and a second routine that classifies the noted spectrum relevant to the specific frequency into a spectrum of an environmental electromagnetic wave or a spectrum of an electromagnetic wave due to partial discharge from the electric machine on the basis of the value of the correlation coefficient obtained by the first routine.
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Citations
12 Claims
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1. An insulation diagnostic unit for an electric machine comprising:
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a sensor disposed near an electric machine; an instrument that performs spectrum analysis on an output of the sensor; a load detection method for the electric machine; a data table in which an output of the load detection method and an output of the spectrum analysis instrument are recorded; a first routine that notes a spectrum relevant to a specific frequency, which is obtained by the spectrum analysis instrument, from among data items recorded in the data table, and obtains a correlation coefficient on the basis of a plurality of data items concerning magnitudes of the noted spectrum, and a plurality of data items of a load obtained at the times of measurement of the plurality of data items; and a second routine that classifies the noted spectrum relevant to the specific frequency into a spectrum of an environmental electromagnetic wave or a spectrum of an electromagnetic wave due to partial discharge from the electric machine on the basis of the value of the correlation coefficient obtained by the first routine. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An insulation diagnostic algorithm for an electric machine, comprising the steps of:
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fetching data, which results from spectrum analysis of an electromagnetic wave measured around an electric machine, and a load imposed on the electric machine; collating a plurality of data items of a specific spectrum out of data items, which result from the spectrum analysis, with the load on the electric machine; recognizing the specific spectrum, which has the magnitude thereof varied along with a change in the load on the electric machine, as frequency components of an electromagnetic wave due to partial discharge from the electric machine; and recognizing a spectrum, which is independent of the change in the load, as frequency components of an environmental electromagnetic wave. - View Dependent Claims (8)
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9. Equipment including the insulation diagnostic unit for an electric machine, comprising:
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an electric machine; and an insulation diagnostic unit including a sensor disposed near the electric machine, an instrument that performs spectrum analysis on an output of the sensor, a load detection method for the electric machine, a data table in which an output of the load detection method and an output of the spectrum analysis instrument are recorded, a first routine that notes a spectrum relevant to a specific frequency, which is obtained by the spectrum analysis instrument, from among data items recorded in the data table, and obtains a correlation coefficient on the basis of a plurality of data items concerning the magnitudes of the spectrum and a plurality of data items of a load; and a second routine that classifies the noted spectrum relevant to the specific frequency into a spectrum of an environmental electromagnetic wave or a spectrum of an electromagnetic wave due to partial discharge from the electric machine on the basis of the value of the correlation coefficient obtained by the first routine. - View Dependent Claims (10, 11, 12)
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Specification