Corrosive Sulfur in Insulating Oils: Its Detection and Correlated Power Apparatus Failures

Scatiggio, Fabio; Tumiatti, V.; Maina, R.; Tumiatti, M.; Pompili, M.; Bartnikas, R.

doi:10.1109/tpwrd.2007.911121

Cited by 119 publications

(73 citation statements)

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“…One of the goals of this examination is to look at the reasons for this particular conductF. Scatiggio et al (2008). Specific consideration is given to the negative qualities sulphur corruption system on both the copper conduits and paper tapes and its general impacts on the transformer and protecting frameworks.…”

Section: Introductionmentioning

confidence: 99%

Transformer Oils and Remedial Procedures on Corrosive Sulfur Effects

Karthikeyan¹,

Tjprc²

2018

IJMPERD

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Section: Introductionmentioning

confidence: 99%

Transformer Oils and Remedial Procedures on Corrosive Sulfur Effects

Karthikeyan¹,

Tjprc²

2018

IJMPERD

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“…Some researchers [10] postulated that copper could migrate towards the cellulose in soluble forms, before binding to sulfur and forming insoluble conductive compounds. This hypothesis might explain the presence of deposits on the layers of Kraft paper wrapping the copper conductors, found in some scrapped units [5,8,9].…”

Section: Introductionmentioning

confidence: 99%

“…These compounds may form partially conductive sulfur salts [4,5] by reaction with copper (copper sulfides), under the normal operating condition of transformers. Copper sulfide can deposit on the layers of Kraft paper wrapping the copper conductors, or on the surface of bare copper bars [5][6][7][8][9]. As a consequence of the formation of copper sulfides in the paper tapes, a worsening of the dielectric properties of solid insulation occurs, with possible electrical failure between the conductors (turn-to-turn short circuit).…”

Section: Introductionmentioning

confidence: 99%

Copper-in-oil dissolution and copper-on-paper deposition behavior of mineral insulating oils

Carlo

Sarzanini

Bruzzoniti

et al. 2014

IEEE Trans. Dielect. Electr. Insul.

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Copper-in-oil dissolution and copper-on-paper deposition may affect the insulation of oil-filled power transformers, shunt reactors and high voltage bushings. Dissolved copper increases the dielectric losses in oil, and copper deposition can dramatically increase insulating papers' conductivity. The available literature does not report researches where the mechanisms of dissolution of copper in oil and copper deposition on the surface of solid insulation (Kraft paper) have been elucidated. This study is aimed at the investigation of the tendency of some commercially available unused mineral oils of different compositions to dissolve copper and to deposit it in the cellulose phase. Different conditions of reaction, presence of oxidation inhibitor (of the hindered-phenols family), addition of triazole-type compound (used as corrosion inhibitor) and general oil properties were studied to investigate their influence on copper concentration in oil and onto paper after artificial aging in controlled conditions.

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“…In the previous two decades, the systematic studies carried out throughout the world on transformer oil and oil immersed equipments and their breakdown have had clearly and conclusively proved that sulphur present in transformer oil and its reaction with copper conductors leads to the formation of copper and cupric sulphide [1][2][3][4][5][6]. The semi conducting copper sulfide which is formed on the copper conductor of windings, starts migrating towards inner papers layers [7,8].…”

Section: Introductionmentioning

confidence: 99%