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Comparison of the mineral oil lifetime estimates obtained by differential scanning calorimetry, infrared spectroscopy, and dielectric dissipation factor measurements

Citace:
POLANSKÝ, R., PROSR, P., VIK, R., MORAVCOVÁ, D., PIHERA, J. Comparison of the mineral oil lifetime estimates obtained by differential scanning calorimetry, infrared spectroscopy, and dielectric dissipation factor measurements. Thermochimica Acta, 2017, roč. 647, č. January 2017, s. 86-93. ISSN: 0040-6031
Druh: ČLÁNEK
Jazyk publikace: eng
Anglický název: Comparison of the mineral oil lifetime estimates obtained by differential scanning calorimetry, infrared spectroscopy, and dielectric dissipation factor measurements
Rok vydání: 2017
Autoři: Doc. Ing. Radek Polanský Ph.D. , Ing. Pavel Prosr Ph.D. , Ing. Robert Vik Ph.D. , Ing. Daniela Moravcová Ph.D. , Ing. Josef Pihera Ph.D. ,
Abstrakt EN: In this study, improved observables and new endpoint criteria were developed to assess the remaininguseful life of mineral transformer oil using differential scanning calorimetry (DSC) and Fourier transforminfrared spectroscopy (FT-IR). The tested oil was exposed to thermal ageing at temperatures of 110,120 and 130?C for times ranging from 100 to 2400 h. The intensity of the infrared spectral band of thelow-temperature inhibitor and the temperature of the thermo-oxidative DSC peak were considered forevaluation. The obtained results were correlated with standardized dielectric dissipation factor (tan )measurements. The results indicated that the analysed observables changed continuously during theapplied thermal ageing. The endpoint criteria were subsequently determined and Arrhenius diagramswere constructed. The results demonstrated that the determination of the actual state or the lifetime ofthe transformer oil via DSC or FT-IR may be beneficial in terms of reducing the measurement time, theinfluence of moisture on the measurement results and the oil volume required for the tests. Thus, DSCand FT-IR represent promising alternatives to dissipation factor measurements.
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