Development and Verification of a Simulation Model to Determine the Breakdown and Partial Discharge Inception Voltage of Basic Air- Insulated Arrangements

Inhalt:
The numerical simulation of physically complex processes is a well-established tool for efficient component development. For electrical insulation systems, simulations of the electrical field are predominantly used. However, the important design parameters breakdown voltage and the related breakdown path can only be deduced with expert knowledge. In order to support future research and engineering, a simulation model is developed that simulates the charge carrier distribution during breakdown and therefore allows the direct determination of the breakdown voltage and breakdown path. Due to the high physical and numerical complexity, the model is constrained to 2D electrode arrangements in atmospheric air at positive direct voltage. A dI/dt stop criterion for the simulation to identify a breakdown is applied, validated by measurements and discussed in this paper.