System and method for off-line impulse frequency response analysis test
First Claim
1. A system for testing a winding, comprising:
- a signal generator, the signal generator configured to generate a plurality of input signals that are applied to the winding;
an input signal sensor configured to detect the plurality of input signals applied to the winding;
an output signal sensor configured to detect a plurality of output signals, each one of the output signals corresponding to one of the input signals after each of the input signals have propagated through the winding;
a processor communicatively coupled to the signal generator and to the sensor, the processor programmed to perform the steps of;
computing for each one of the plurality of input signals an auto-spectral density (Gxx) based upon a frequency response X(f) of each input signal;
computing a cross-spectral density (Gxy) based upon the frequency response X(f) of each input signal and a frequency response Y(f) of the associated output signal of the plurality of output signals; and
computing the characteristic signature [H(f)] for the winding based upon Gxy and Gxx for pairs of associated input and output signals.
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Abstract
The winding testing unit provides a system and method for determining a characteristic signature of a winding residing in a device, such as a transformer or generator. A pulse/signal generator applies a suitable number of non-precise and non-identical pulses to the winding. A sensor detects output pulses after each applied input pulse has propagated through the winding. Data corresponding to the applied input and the detected output pulses are stored as data pairs in a memory. The processor executes logic to compute the auto-spectral density (Gxx) and the cross-spectral density (Gxy) for the data pairs. The logic then computes the characteristic signature, H(f), for the winding such that H(f) equals the average of Gxy divided by the average of Gxx for the data pairs. Comparison of the characteristic signatures over a period of time indicates winding deformation or displacement during the time period.
10 Citations
38 Claims
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1. A system for testing a winding, comprising:
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a signal generator, the signal generator configured to generate a plurality of input signals that are applied to the winding;
an input signal sensor configured to detect the plurality of input signals applied to the winding;
an output signal sensor configured to detect a plurality of output signals, each one of the output signals corresponding to one of the input signals after each of the input signals have propagated through the winding;
a processor communicatively coupled to the signal generator and to the sensor, the processor programmed to perform the steps of;
computing for each one of the plurality of input signals an auto-spectral density (Gxx) based upon a frequency response X(f) of each input signal;
computing a cross-spectral density (Gxy) based upon the frequency response X(f) of each input signal and a frequency response Y(f) of the associated output signal of the plurality of output signals; and
computing the characteristic signature [H(f)] for the winding based upon Gxy and Gxx for pairs of associated input and output signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for testing a winding, the method comprising the steps of:
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communicating a plurality of signals through the winding;
computing for each one of the plurality of signals an auto-spectral density (Gxx) based upon a frequency response X(f) of the signal before the signal is communicated through the winding;
computing for each one of the plurality of signals a cross-spectral density (Gxy) based upon the frequency response X(f) of the signal before the signal is communicated through the winding and a frequency response Y(f) of the signal after the signal is communicated through the winding; and
computing a characteristic signature [H(f)] for the winding based upon Gxy and Gxx for the plurality of signals. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for testing a winding, the method comprising the steps of:
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applying an input signal to the winding;
detecting the input signal;
detecting an output signal from the winding, the output signal resulting from a propagation of the input signal through the winding;
associating the input signal and the output signal to identify a signal pair;
determining an input signal frequency response [X(f)] for the input signal;
determining an output signal frequency response [Y(f)] for the output signal;
computing an input signal auto-spectral density (Gxx) for the input signal frequency response X(f);
computing a cross-spectral density (Gxy) from the input signal frequency response X(f) and the output signal frequency response Y(f);
repeating a plurality of times the steps of;
applying the input signal, detecting the input signal, detecting the output signal, associating the input signal and the output signal to identify the signal pair, determining X(f), determining Y(f), computing Gxx, and computing Gxy; and
computing a characteristic signature [H(f)] for the winding based upon an average of Gxy and Gxx for the signal pairs. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 32, 33, 34)
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29. A system for testing a winding, comprising:
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means for communicating a plurality of signals through the winding;
means for computing for each one of the plurality of signals an auto-spectral density (Gxx) based upon a frequency response X(f) of the signal before the signal is communicated through the winding;
means for computing for each one of the plurality of signals a cross-spectral density (Gxy) based upon a frequency response Y(f) of the signal after the signal is communicated through the winding; and
means for computing a characteristic signature [H(f)] for the winding based upon an average of Gxy and Gxx for the plurality of signals. - View Dependent Claims (30, 31, 35)
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36. A computer readable medium having a program for determining a characteristic signature of a winding, the program comprising logic configured to perform the steps of:
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computing for each one of a plurality of signals communicated through the winding an auto-spectral density (Gxx) based upon a frequency response X(f) of the signal before the signal is communicated through the winding;
computing for each one of the plurality of signals a cross-spectral density (Gxy) based upon a frequency response Y(f) of the signal after the signal is communicated through the winding; and
computing a characteristic signature [H(f)] for the winding based upon an average of Gxy and Gxx for the plurality of signals. - View Dependent Claims (37, 38)
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Specification