Abstract
This paper presents the study of intermediate frequency vacuum arc under an axial magnetic field (AMF). Arc voltage noise at the first current half-cycle is inconspicuous even if the current is not interrupted successfully, it can be attributed to the application of a sufficiently strong AMF provided by the current in a short vacuum gap. The influence of current frequency on peak arc voltage and the rate of rise of arc voltage are investigated. Interrupting capacity of a CuCr50 cup-type vacuum interrupter (VI) with AMF is examined; the current interruption limit is inversely proportional to frequency from 400 Hz-800 Hz, in agreement with the experimental and theoretical results achieved by other scholars. The eddy current field of a CuCr50 cup-type VI with AMF is studied by the finite-element method based on a simplified axial symmetric model; the results show that the phase shift angle increases conspicuously with the increase of current frequency, and besides the rate of change of current (di/dt) when the current passes zero, phase shift angle also influences the intermediate frequency current interrupting capacity of the VI.
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