Method for classifying the status of the winding clamping of a power transformer
First Claim
1. A method for classifying a status of a winding clamping of a power transformer immersed in an oil filled transformer tank, the power transformer including at least one transformer coil with at least one clamped electrical winding arranged on a transformer core, the method comprising:
- applying a mechanical force impulse on an impact area of the transformer tank, so that the at least one clamped electrical winding is mechanically excited to vibration and a voltage is induced within the at least one clamped electrical winding therewith;
measuring the induced voltage of the at least one clamped electrical winding for a period of time during vibration to generate measurement data;
transferring the measurement data from the time domain into the frequency domain and providing a respective dataset comprising the measurement data in the frequency domain; and
searching for local maxima within the measurement data in the frequency domain of the dataset, the searching comprising;
classifying the status of the winding clamping of the at least one clamped electrical winding as defective if there is no distinct maximum within the local maxima; and
classifying the status of the winding clamping of the at least one clamped electrical winding as at least possibly sufficient if there is exactly one distinct maximum within the local maxima.
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Accused Products
Abstract
A method for classifying a status of a winding clamping of a power transformer immersed in an oil filled transformer tank, the power transformer including at least one transformer coil with at least one clamped electrical winding arranged on a transformer core, includes the following steps: applying a mechanical force impulse on an impact area of the transformer tank, so that the at least one clamped electrical winding is mechanically excited to vibration and a voltage is induced within the at least one clamped electrical winding; measuring the induced voltage of the at least one clamped electrical winding for a period of time during vibration to generate measurement data; transferring the measurement data from the time domain into the frequency domain and providing a respective dataset comprising the measurement data in the frequency domain; and searching for local maxima within the measurement data in the frequency domain of the dataset.
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Citations
13 Claims
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1. A method for classifying a status of a winding clamping of a power transformer immersed in an oil filled transformer tank, the power transformer including at least one transformer coil with at least one clamped electrical winding arranged on a transformer core, the method comprising:
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applying a mechanical force impulse on an impact area of the transformer tank, so that the at least one clamped electrical winding is mechanically excited to vibration and a voltage is induced within the at least one clamped electrical winding therewith; measuring the induced voltage of the at least one clamped electrical winding for a period of time during vibration to generate measurement data; transferring the measurement data from the time domain into the frequency domain and providing a respective dataset comprising the measurement data in the frequency domain; and searching for local maxima within the measurement data in the frequency domain of the dataset, the searching comprising; classifying the status of the winding clamping of the at least one clamped electrical winding as defective if there is no distinct maximum within the local maxima; and classifying the status of the winding clamping of the at least one clamped electrical winding as at least possibly sufficient if there is exactly one distinct maximum within the local maxima. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification