Reviews on sulphur corrosion phenomenon of the oil–paper insulating system in mineral oil transformer

Abstract

The active sulphur compounds in transformer oil would react with copper wires and produce cuprous sulphides, which then attach themselves to the surface of copper wires and insulating paper, thus reducing the electrical performance of oil-paper insulation and causing insulation failure. This article aims to make a comprehensive summary on the field of sulphur corrosion of oil-paper insulation in the mineral oil transformer, including the corrosion mechanism of sulphide on copper sheets, the deterioration mechanism of sulphide on oil-paper, the factors influencing sulphur corrosion reaction, the method of characterising the degree of sulphur corrosion, the protection technology of sulphur corrosion and the field operation measures for sulphur corrosion. Moreover, four key problems that need to be further solved were sorted out: the synergistic deterioration mechanism of sulphide and its transformation mechanism, the micro-process and forming path of sulphur corrosion reaction, the characteristic parameters and quantitative characterisation methods of sulphur corrosion degree, and the effective protection technology of sulphide corrosion. To solve these problems, efforts will be made for deeper understanding of the sulphur corrosion phenomenon and its deterioration mechanism based on theoretical background, the assessment methods and protection technology, endeavouring to put forward solid theoretical basis and feasible technical means for preventing sulphur corrosion insulation failure. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

Dissolved gas analysis and dissipation factor measurement of mineral oil‐based nanofluids under thermal and electrical faults

“…Any fault in the transformer causes a sudden interruption of the power supply, increases the reparation cost, and reduces the power system's reliability. Consequently, avoiding failures and maintaining the safe operation of transformers is crucial to ensure the overall system's reliability [1][2][3][4]. The health of a power transformer's insulation is critical to its long-term integrity and reliability.…”

Vibrational Spectra and Molecular Vibrational Behaviors of Dibenzyl Disulfide, Dibenzyl Sulphide and Bibenzyl

“…Nowadays, the sulfur corrosion problem of power equipment has received widespread concern [1][2][3][4][5]. The failures caused by corrosive sulfur greatly affect the safety and stability of the power system and result in substantial economic losses.…”

Polarization loss analysis and ageing characterisation of transformer oil‐immersed insulation by using decoupled frequency domain spectroscopy

“…The oil-paper insulation is widely used in electrical equipment due to its satisfactory cost and excellent insulation performance. The deterioration (ageing) of transformer oil-immersed insulation is directly related to the safety and reliability of the operation of equipment [1,2]. It is thus of great significance to accurately evaluate the ageing degree of transformer oilimmersed insulation.…”