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1. (WO2018050499) METHOD AND DEVICE FOR DETERMINING AND/OR MONITORING THE STATE OF A TRANSFORMER OIL

Pub. No.:    WO/2018/050499    International Application No.:    PCT/EP2017/072286
Publication Date: Fri Mar 23 00:59:59 CET 2018 International Filing Date: Thu Sep 07 01:59:59 CEST 2017
IPC: G01H 15/00
G01H 3/04
G01N 29/00
Applicants: PASSERRO GMBH
Inventors: WROBEL, Matthias
Title: METHOD AND DEVICE FOR DETERMINING AND/OR MONITORING THE STATE OF A TRANSFORMER OIL
Abstract:
The invention relates to a method for determining and/or monitoring the state of a transformer oil comprising, a) carrying out acoustic spectroscopy on the transformer oil, wherein a plurality of ultrasonic transmission signals with different frequencies and/or amplitudes are output into the transformer oil, and corresponding reflected and/or transmitted ultrasonic reception signal is with different frequencies and/or amplitudes signals are received after passing through the transformer oil; and b) comparing the ultrasonic transmission signals with the corresponding ultrasonic reception signals, wherein an n-dimensional function which is characteristic of the transformer oil is determined; and c) assigning the determined characteristic n-dimensional function of the step b) to a reference function which is known for the transformer oils and has a corresponding dimension, wherein a reference transformer oil is determined; and d) acquiring a first value of at least one characteristic physical property of the transformer oil; and e) comparing the first value with a corresponding value of the reference transformer oil; and f) determining the state of the transformer oil on the basis of the comparison carried out in step e). Furthermore, the invention relates to a device (100, 200) for determining and/or monitoring the state of a transformer oil.