The anode surface temperature of CuCr contacts at the limit ofcurrent interruption |
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| Authors: | Watanabe K. Sato J. Kagenaga K. Somei H. Homma M. Kaneko E. Takahashi H. |
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| Affiliation: | Power Switching Eng. Group, Toshiba Corp., Tokyo ; |
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| 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 |
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