Gas production mechanism of Irgamet 39 and its long‐term corrosion resistance

Abstract

The phenomenon of transformer failure caused by oil‐sulphur corrosion of oil₋paper insulation system has always been concerned by scholars. Irgamet 39 is the most used metal passivator for inhibiting sulphur corrosion. However, Irgamet 39 causes abnormal dissolved gas in oil during the process of exerting anti‐corrosion effect. Herein, the gas production mechanism of Irgamet 39 and its long‐term corrosion resistance were investigated. Compared with other metal passivators, the Irgamet 39 produces more dissolved gases in oil, especially H2, CO and CO2. The main sources of free radicals in the gas production process are from the branched chains of the Irgamet 39 structure (−CH2N(C8H17)2 and −CH3). Furthermore, the ageing products of insulating paper and oil promote the cleavage of the chain in the Irgamet 39 molecule, which then causes Irgamet 39 to generate more dissolved gases. Irgamet 39 exhibits excellent long‐term corrosion inhibition properties,while it also leads to abnormal gases in the oil, which can affect the interpretation of the dissolved gas analysis data and thus interfere with the diagnosis. This work provides useful information for the practical application of Irgamet 39 and helps electrical workers make reasonable predictions for transformer problems.

Effect of the grain boundary character distribution on the sulfur corrosion behaviour and mechanisms of copper windings under different high temperatures

“…From the outer environmental impact factors, temperatures [13,18], oxygen [19], electric field [20], and related synergistic effects [21,22] were the research hotspots. From the inner oilpaper insulating system, scholars have recently focused on the following points: thiophene (C 4 H 4 S) degradation in various oil brands [23,24], gas production of passivators in oils [25,26], the moisture in the oil-paper system [27,28], and the cellulose structure of oil-impregnated paper [29] etc.…”

Prediction of dissolved gas content in transformer oil based on multi‐information fusion

“…Transformers are important equipment in power systems, and their stable operation is crucial to the supply of high-quality electrical energy [1]. Transformers mainly use oil-paper insulation structures, but during operation, the oil-paper insulation material will gradually age and decompose, and dissolve a small amount of gases, such as H 2 , CH 4 , C 2 H 6 , C 2 H 2 , C 2 H 4 , CO, and CO 2 [2]. Dissolved Gas Analysis (DGA) technology can detect potential faults inside the transformer and track its development trend based on changes in gas component content, proportion and relative percentage [2][3][4][5].…”

“…Transformers mainly use oil-paper insulation structures, but during operation, the oil-paper insulation material will gradually age and decompose, and dissolve a small amount of gases, such as H 2 , CH 4 , C 2 H 6 , C 2 H 2 , C 2 H 4 , CO, and CO 2 [2]. Dissolved Gas Analysis (DGA) technology can detect potential faults inside the transformer and track its development trend based on changes in gas component content, proportion and relative percentage [2][3][4][5]. The change pattern and trend analysis of dissolved gases in transformer oil can be used for early diagnosis of internal faults in transformers [6,7].…”