Erik Roger Jonsson
Erik Roger Jonsson
Publications and responsibilities
Comparison of Different Air Flow Concepts for a Medium Voltage Load Break Switch
The research and development work towards a compact SF6-free load break switch for the medium voltage range has led to several design proposals. The interruption capability of three different nozzle and gas flow concepts with atmospheric air as the interrupting medium is compared and assessed. The t...
Arc voltage measurements of ultrahigh pressure nitrogen Arcs in cylindrical tubes
This paper focuses on the arc voltage measurements of electrical arcs burning inside cylindrical tubes in nitrogen at different filling pressures from atmospheric and up to 80 bar. To investigate the effect of ablation, both nonablating ceramic tubes (alumina) and ablating polytetrafluoroethylene (P...
Arc voltage characteristics in ultrahigh-pressure nitrogen including supercritical region
A supercritical (SC) fluid is formed when both pressure and temperature of a fluid exceed the critical point, where distinct gas and liquid phases no longer exist. SC fluids demonstrate combined properties of gas and liquid, which make them interesting to investigate them as an arc extinction medium...
Contact and nozzle wear from 100 interruptions for a puffer-type air load break switch
One type test requirement for medium voltage load break switches is to interrupt 100 consecutive "mainly active loads". A puffer-type switch with axial-blown arc has been tested according to the 630 A/24 kV ratings. The nozzle and contact wear were measured regularly to investigate design ...
Testing av småkraftverks fault ride throug egenskaper
Ablation-assisted interruption of load current - An experimental study of arc-quenching characteristics
Experimental investigation on ablation-assisted current interruption - Experimental setup and preliminary results
Empirical Relationships between Air-Load Break Switch Parameters and Interrupting Performance
A simple gas blow switch consisting of an axisymmetric tulip/pin contact and a cylindrical polytetrafluoroethylene (PTFE) nozzle has been used for empirical studies of medium voltage load current interruption in air. Only the thermal phase of the interruption is considered. Based on the results of m...
Air-Flow Investigation for a Medium-Voltage Load Break Switch
Replacing SF6 with air as the arc quenching medium in switching equipment is favorable from an environmental point of view, but may be technically difficult for compact devices. Medium-voltage load break switches have modest current and voltage ratings, typically 630 A/24 kV, and are thus expected t...