A new method for measuring the degradation level of transformer insulating oil in service

The aging process in transformer insulating oil was studied by measuring the leakage current in a ceramic sensor. The current of the sensor shows a close relationship with the acid value and the breakdown voltage of the transformer oil. The sensor has excellent physico-chemical properties, such as lack of chemical reaction with the oil and stable adsorption of conductive impurities. Therefore, the experimental data show good reproducibility.<
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