High voltage DC modelling and simulation
01 April 2016 13:15 T221, Teknikhuset
The focus of the talk is on modelling the electric field distribution over time, which is the key for assessing the performance of an electrical insulation system.
Speaker
Nils Lavesson, Principal Scientist, ABB Corporate Research i Västerås, Sweden.
Summary
High voltage DC components are becoming more and more common in electrical power systems and this talk discusses the challenges that arise when designing high voltage DC electrical insulation. The focus of the talk is on modelling the electric field distribution over time, which is the key for assessing the performance of an electrical insulation system. For DC electric fields the time dependency is determined by the conduction of charge through the dielectric materials, which can typically happen through different mechanisms in different materials.
A few examples of high voltage components are discussed and typical examples of combinations of dielectric materials. The main application considered is gas insulated switchgear (GIS), where the electrical insulation is composed of a combination of pressurized sulfur hexafluoride (SF6) gas and solid spacers made from epoxy. Conduction models for each media is presented and a method for efficiently combining them. To validate the model simulations are performed using COMSOL Multiphysics for two different test geometries both measured at ETH Zürich.