Version 1
: Received: 28 October 2024 / Approved: 28 October 2024 / Online: 28 October 2024 (15:01:08 CET)
How to cite:
Moranda, H.; Moscicka-Grzesiak, H. A Particularly Dangerous Case of the Bubble Effect in Transformers which Appearing in a Large Mass of Pressboard Heated by Mineral Oil. Preprints2024, 2024102203. https://doi.org/10.20944/preprints202410.2203.v1
Moranda, H.; Moscicka-Grzesiak, H. A Particularly Dangerous Case of the Bubble Effect in Transformers which Appearing in a Large Mass of Pressboard Heated by Mineral Oil. Preprints 2024, 2024102203. https://doi.org/10.20944/preprints202410.2203.v1
Moranda, H.; Moscicka-Grzesiak, H. A Particularly Dangerous Case of the Bubble Effect in Transformers which Appearing in a Large Mass of Pressboard Heated by Mineral Oil. Preprints2024, 2024102203. https://doi.org/10.20944/preprints202410.2203.v1
APA Style
Moranda, H., & Moscicka-Grzesiak, H. (2024). A Particularly Dangerous Case of the Bubble Effect in Transformers which Appearing in a Large Mass of Pressboard Heated by Mineral Oil. Preprints. https://doi.org/10.20944/preprints202410.2203.v1
Chicago/Turabian Style
Moranda, H. and Hanna Moscicka-Grzesiak. 2024 "A Particularly Dangerous Case of the Bubble Effect in Transformers which Appearing in a Large Mass of Pressboard Heated by Mineral Oil" Preprints. https://doi.org/10.20944/preprints202410.2203.v1
Abstract
The topic concerns the so far unknown mechanism of bubble effect in a large mass of moistured cellulose heated with mineral oil. The so far well-known phenomenon of bubble effect occurs in the Hot Spot area, i.e., in the place where the hot metal of the windings is in contact with the winding paper. As a result of presented in the article model tests, it was shown that cyclical heating of the transformer windings causes significant drying of the winding paper what reduces the possibility of bubble effect in the Hot Spot area, while there is a possibility of bubble effect appearing in large volume of pressboard heated with mineral oil. It has been shown that the pressure in the air cushion over oil surface, after the bubble effect starts in the pressboard, depends on the ratio of the mass of cellulose to the mass of oil: the greater the ratio, the greater the pressure in the air cushion. The ar-ticle presents the dependence of bubble effect initiation temperature in pressboard heated with oil on pressboard moisture.
Engineering, Electrical and Electronic Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
