The Spatial Distribution of Temperature in a Cross Section of Arc Column Nearby Cathode Contact

摘要

By measuring simultaneously the spatial distributions of two spectral intensities with AgI-421nm and AgI-546nm spectrum in a cross section of an arc column by two sets assembled with a CCD color linear image sensor and a combination of optical filters, authors have estimated the radial distributions of temperature of arc column between separating Ag, AgCdO and AgSnO_2 contacts in DC 50V and 2.5, 3.3 and 5.0A circuits.rnThe peak temperature in the cross section of the arc column nearby the cathode contact between Ag contacts is at the axis, and its value is depended on the arc duration. For the duration of metallic phase arc, the peak temperature is high, for the metallic-gaseous transition period it goes down temporarily, for the beginning of the gaseous phase arc it goes up, and for the duration of gaseous phase arc it gradually goes down.rnThe temperature difference between at the center and at the fringe of the arc column becomes low with developing the breaking arc.rnThe higher the interrupted current is, the higher the peak temperatures of the arc column at the terminal arc become.rnThe arc temperatures in ,AgCdO and AgSnO_2 contacts turn into the same feature in Ag contacts.