Importance

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Abstract

The disclosure relates to a method for determining and/or monitoring the state of a transformer oil, comprising the steps of

a) performing an acoustic spectroscopy of the transformer oil, multiple ultrasonic emission signals of different frequencies and/or amplitudes being emitted into the transformer oil and corresponding reflected and/or transmitted ultrasonic reception signals of different frequencies and/or amplitudes being received after having passed through the transformer oil; andb) comparing the ultrasonic emission signals with the corresponding ultrasonic reception signals, an n-dimensional function characteristic of the transformer oil being ascertained; andc) matching the ascertained characteristic n-dimensional function from step b) with a reference function of corresponding dimension known for transformer oils, a reference transformer oil being determined; andd) registering a first value of at least one characteristic physical property of the transformer oil; ande) comparing the first value with a corresponding value of the reference transformer oil; andf) ascertaining the state of the transformer oil based on the comparison performed in step e).

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First Claim