The Electrochemical Impedance Spectroscopy as a Diagnostic Tool of the Transformer Oil

Abstract

The quality of the transformer oil is essential to ensure its right performance in electrical appliances such as transformers and switches, in which oil works as insulating. The necessity toguarantee such condition can be affected due to the law level of pollution, refining, and humidity among others, reason why a systematic evaluation of the oil´s condition must be carried out to avoid the expensive failures in the power´s transmission and distribution. This work deals with the usage of the Electrochemical Impedance Spectroscopy for the first time as a diagnostic of the national new regenerated oils, which helps showing its resistive behavior to corrosive processes and so the preservation of its electrical properties. An electrochemical glass cell with three electrodes is used in this work in order to control the test temperature to a specific determined range (75° C y 95° C). Electrolytic copper was used as work electrode, taking as reference and auxiliary the ones specified for this purpose. The impedance spectrums obtained, confirmed the dielectric properties of the oil tested. With the increase of the temperature, the resistive effect of the oil decreases.

Keywords

• aceite dieléctrico
• transformadores
• espectroscopia de impedancia electroquímica
• comportamiento resistivo