Title :
The Electrode Surface State after Current Interruption in Vacuum Circuit Breaker
Author :
Ide, Naotaka ; Sakuma, Ryohei ; Kaneko, Eiji ; Yanabu, Satoru
Author_Institution :
Tokyo Denki Univ.
Abstract :
We have researched the factors of high insulation recovery characteristics after current interruption in vacuum circuit breakers (VCB). VCB have high insulation recovery characteristics because of diffusing metal vapor to surroundings by high diffusion effect of vacuum. However, when the arc current exceeded the certain value, electrode erosion was remarkable and insulation recovery characteristics decreased. In this paper, we measure anode surface temperature just after current zero with two-color pyrometer. And we observe the vacuum arc with high speed CCD camera. Contact material we used are Cu, CuCr, and AgWC. Test results were as follows. Melting duration of CuCr electrode was longer than that of the Cu electrode. We observed particles in vacuum arc in the case of Cu electrode and AgWC electrode, but we could not observe any particles in the case of CuCr electrode
Keywords :
copper; copper compounds; electrical contacts; electrodes; silver compounds; surface structure; vacuum arcs; vacuum circuit breakers; AgWC; Cu; CuCr; anode surface temperature; arc current; current interruption; diffusing metal vapor; diffusion effect; electrode erosion; electrode surface state; high speed CCD camera; insulation recovery characteristics; melting duration; two-color pyrometer; vacuum arc; vacuum circuit breaker; Anodes; Charge coupled devices; Charge-coupled image sensors; Circuit breakers; Current measurement; Electrodes; Insulation; Temperature measurement; Testing; Vacuum arcs;
Conference_Titel :
Discharges and Electrical Insulation in Vacuum, 2006. ISDEIV '06. International Symposium on
Conference_Location :
Matsue
Print_ISBN :
1-4244-0191-7
Electronic_ISBN :
1093-2941
DOI :
10.1109/DEIV.2006.357315
