Properties of Intermediate-Frequency Vacuum Arc Under Axial Magnetic Field

This paper presents an experimental study of the intermediate-frequency (400-800 Hz) vacuum arc under axial magnetic field (AMF). Arc-voltage noise at the first current semi-wave is inconspicuous even if the current is not interrupted successfully. This fact is attributed to the application of a suf...

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Bibliographic Details
Published in:IEEE transactions on plasma science 2009-08, Vol.37 (8), p.1477-1483
Main Authors: Jing, W, Jianwen, W, Liying, Z
Format: Article
Language:English
Subjects:
Arc voltage
axial magnetic field (AMF)
Capacitance
Circuit breakers
Electric currents
Electric potential
Electric power
Electron tubes
Finite element analysis
Finite element method
Finite element methods
Frequencies
Frequency
intermediate-frequency vacuum arc
Interrupters
Interruption
Magnetic fields
Magnetic noise
Magnetic properties
Mathematical analysis
Mathematical models
phase shift of AMF
Studies
upper limit of current interruption
Vacuum arcs
vacuum interrupter (VI)
Voltage
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Summary:This paper presents an experimental study of the intermediate-frequency (400-800 Hz) vacuum arc under axial magnetic field (AMF). Arc-voltage noise at the first current semi-wave is inconspicuous even if the current is not interrupted successfully. This fact is attributed to the application of a sufficiently strong AMF provided by the current flowing through a short vacuum gap. The influence of the current frequency on peak arc voltage and the rate of rise of the arc voltage are investigated. Interrupting ability of a vacuum interrupter (VI) with cup-type AMF contacts made from CuCr50 is examined. It is found that the upper limit of current interruption is inversely proportional for frequencies in the range from 400 to 800 Hz. Phase shift of AMF is studied by the finite-element method based on a simplified symmetric model. The results show that the phase-shift angle increases with the current frequency and influences intermediate-frequency current interruption of VI with AMF contacts.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.2009.2024748