Temperature Measurement of SF6 Arcs in Thermal Interruption Region Around Current Zero in Gas Circuit Breakers Using Optical Emission Spectroscopy

We focused on the temperature change in SF
6
arcs with respect to the thermal interruption performance. Optical emission spectroscopy was carried out for the arcs around current zero at the same time as current interrupting tests and pressure measurements in a small model circuit breaker. As a result, the temperature at the stagnation point dropped twice faster in higher blowing pressure than in lower one around current zero, resulting in the higher thermal interruption performance.