High-current vacuum arc appearance in nonhomogeneous axial magnetic field

Author

Chaly, A.M. ; Logatchev, A.A. ; Zabello, K.K. ; Shkol´nik, S.M.

Author_Institution

Tavrida Electr. Ltd., Moscow, Russia

fYear

2002

fDate

2002

Firstpage

380

Lastpage

383

Abstract

The distribution of the spots over the cathode of high-current vacuum arc stabilized by axial magnetic field (AMF) has been investigated. AMF configuration has been varied from conventional "bell-shaped" to "magnetic barrier", where substantial AMF is created in the electrode edge virtually vanishing in the center. Complex effect of the AMF configuration on the behavior of cathode spots has been found. This behavior has been satisfactorily explained based on the Steenbeck principle. It has been shown that "magnetic barrier" represents optimum AMF configuration providing even current distribution and minimum arc voltage.

Keywords

cathodes; magnetic fields; vacuum arcs; Steenbeck principle; cathode spots distribution; electrode edge; even current distribution; high-current vacuum arc; magnetic barrier configuration; minimum arc voltage; nonhomogeneous axial magnetic field; stabilized vacuum arc; Anodes; Cathodes; Circuit breakers; Current density; Current distribution; Current supplies; Electrodes; Magnetic fields; Vacuum arcs; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Discharges and Electrical Insulation in Vacuum, 2002. 20th International Symposium on

Print_ISBN

0-7803-7394-4

Type

conf

DOI

10.1109/ISDEIV.2002.1027388

Filename

1027388