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Since conducting particles are considered to be the reason for the late discharge phenomenon in Vacuum Circuit Breaker (VCB) after the interruption of large current, such as some non-sustained disruptive discharge (NSDD) and some re-strike. This paper constructs the synthetic experiment system using the duplicate circuit to research the expected particles induced late discharge phenomenon. This experiment...
In order to investigate the behavior of protrusions in VCB, the point-to-plane insulation structure is constructed in vacuum. The high speed video camera is synchronized with the high voltage and used to visualize the phenomena. Particles are observed with supplementary laser. But, the vapor is recorded through the excitation emission with the projection of the field emission electron. It is observed...
To identify the influence of current interruption on the insulation strength of vacuum interrupters (VIs), the voltage to time-lag characteristics of VIs are measured from nanoseconds to several microseconds range before and after current interruption. The breakdown voltage increases after the current interruption for VIs with Cu–Cr contacts. The field emission current of contacts are also...
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