Title :
The anode surface temperature of CuCr contacts at the limit of current interruption
Author :
Watanabe, Kenji ; Sato, Junichi ; Kagenaga, Kiyoshi ; Somei, Hiromichi ; Homma, Mitsutaka ; Kaneko, Eiji ; Takahashi, Hideomi
Author_Institution :
Power Switching Eng. Group, Toshiba Corp., Tokyo, Japan
fDate :
8/1/1997 12:00:00 AM
Abstract :
This paper estimates anode surface temperature at the current interruption limit by measuring the melting time of a contact material after current interruption and simulating the anode surface temperature. As a result, the minimum anode surface temperature of CuCr(50/50) contact material was about 1750 K. We also calculated the metal vapor density between electrodes with a simplified model. The calculation results showed that the critical vapor density was about 3×1020 atoms/m3. This vapor density is equivalent to the averaged pressure of 8 Pa, which is close to the value of the Paschen minimum
Keywords :
anodes; chromium alloys; copper alloys; electrical contacts; melting; temperature measurement; vacuum arcs; vacuum interrupters; 1750 K; CuCr; CuCr contacts; Paschen minimum; anode surface temperature; contact material; critical vapor density; current interruption limit; melting time; metal vapor density; vacuum arc; vacuum interrupter; Anodes; Area measurement; Current measurement; Density measurement; Electrodes; Magnetic field measurement; Temperature measurement; Time measurement; Vacuum arcs; Wavelength measurement;
Journal_Title :
Plasma Science, IEEE Transactions on
