Open AccessComparative study of the degradation rate of new and regenerated mineral oils following electrical stress
Author(s) -
Oumert Leila Safiddine,
Boucherit Ahmed,
Zafour Amel HadjZiane,
Fofana Issouf
Publication year - 2018
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2018.6077
Subject(s) - degradation (telecommunications) , mineral oil , dielectric , electrical resistivity and conductivity , transformer oil , materials science , dissipation factor , dielectric loss , transformer , acid value , electric field , environmental science , composite material , analytical chemistry (journal) , petroleum engineering , chemistry , electrical engineering , environmental chemistry , geology , voltage , metallurgy , optoelectronics , biochemistry , physics , quantum mechanics , engineering
The objective of this contribution was to study the behaviour of new and regenerated insulating oil used in power transformers under the influence of an electric stress. To estimate the degradation rate of the dielectric fluids, one thousand (1000) successive breakdowns were generated according to the IEC 60156 standard. The parameters such as dissipation factor (Tan δ ), resistivity, total acid number (TAN) and oil water content were measured and examined following IEC/ISO standards. Good correlations have been obtained between TAN/resistivity and Tan δ which might provide a ‘picture’ of the fluid condition. The dissolved oxidation products for the two dielectric fluids (after the application of electric breakdowns) was evaluated by Fourier‐transform infrared spectroscopy. The results obtained indicate that the degradation of the parameters is significant and confirms the influence of an alternative electric field (AC) on the new and regenerated oils. It was also suspected that inhibitors and antioxidants were removed from the oil after regeneration. Their concentration should therefore be monitored and replenished when necessary.