Title
Bubble effect as a consequence of dielectric losses in cellulose insulation
Authors
[ 1 ] Instytut Elektroenergetyki, Wydział Elektryczny, Politechnika Poznańska | [ P ] employee
Year of publication
2010
Article type
scientific article
Publication language
english
Keywords
EN
- power transformer insulation
- bubbles
- dielectric losses
- aging
- moisture
- temperature
Abstract
EN The main reason of the research was to show the very important role of the dielectric losses in the insulation, during the initiation of water release from paper insulation, which is known as the bubble effect. The authors' thesis is that the dielectric losses increase in heavily moistened and aged cellulose insulation can cause dangerous temperature increase. The result of the temperature increase can be a dangerous bubble effect. The temperature increase caused by the dielectric losses in the paper insulation was called the thermal effect. The authors used samples of new and aged cellulose insulation for the research. The ageing extent of the paper samples was described by means of the cellulose polymerization degree. The ageing extent of the oil was described by means of the neutralization value. The authors investigated the influence of cellulose insulation ageing and moistening on dielectric losses. They also described conditions, i.e. insulation moistening and ageing, electric field intensity, which can lead to the thermal effect with the resulting bubble effect.
Pages (from - to)
913 - 919
Impact Factor
1,477
System created by Poznań University of Technology
and Poznan Supercomputing and Networking Center
Log in through eKonto to add to SIS