Abstract
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
requirements and the impact from nozzle wear on gas flow. The contact wear is only moderate, while
the nozzle wear causes a decrease in pressure build-up, which in turn may influence the interruption
performance.
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
requirements and the impact from nozzle wear on gas flow. The contact wear is only moderate, while
the nozzle wear causes a decrease in pressure build-up, which in turn may influence the interruption
performance.