Numerical modeling of long air gaps tested with positive switching impulses
(English)Manuscript (preprint) (Other academic)
The numerical modeling of electrical gas discharges occurring in atmospheric air have been in continuous development during the last decades in different fields like high voltage techniques and lightning protection. Different methodologies have been proposed to represent the different physical phenomena taking place at a single full discharge event, departing both from experimental and theoretical approaches. The implementation of these methodologies in numerical routines combined with the use of a finite element method solver to determine the electric potential distribution, permits creation of models whose predictions closely agree with the real situations, where electrode arrangements might include non-symmetric geometries. In this paper, we present the results obtained using a new version of a simulation methodology that have been evolving during the last years, including new elements like the three-dimensional leader tortuosity from experimental measurements and two new methods for the leader-corona charge estimation. Results from the simulation were compared with experimental records and a good agreement is found between them.
Gas discharge, electric breakdown, EHV insulation, UHV insulation
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject Engineering Science with specialization in Atmospheric Discharges
IdentifiersURN: urn:nbn:se:uu:diva-298356OAI: oai:DiVA.org:uu-298356DiVA: diva2:945859