Title :
Evolution of bubble in oil-paper insulation and its influence on partial discharge
Author :
Zhong Zheng ; Lihua Chen ; Junwei Diao ; Rongliang Wang
Author_Institution :
State Key Lab. for Alternate Electr. Power Syst. with Renewable Energy Sources, North China Electr. Power Univ., Beijing, China
Abstract :
The synergic effects of bubble formation and partial discharge activity in oil-paper insulation are investigated. By controlled lab experiments and Finite Element Computation, the bubble emission rate under various level of partial discharge is studied. The intensification of electric field due to the presence of bubble in oil-paper insulation is calculated. Finally, the partial discharge activity caused by bubbles is tested. The results show that, contrary to our traditional negligence of small partial discharge activity in low field regions, a corona of 50 pC at the bottom of magnet core, for example, may generate enough bubbles to cause flashover at the top insulation layers.
Keywords :
bubbles; finite element analysis; paper; partial discharges; power transformer insulation; transformer oil; bubble emission rate; bubble evolution; bubble formation synergic effects; corona; electric field intensification; finite element computation; flashover; low field regions; magnet core; oil-paper insulated transformer; partial discharge activity; Discharges (electric); Displacement measurement; Partial discharges; Bubble formation; Experiment; Finite element computation; Oil-paper insulation; Partial discharge;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena (CEIDP), 2014 IEEE Conference on
Conference_Location :
Des Moines, IA
DOI :
10.1109/CEIDP.2014.6995895
