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During the making operations for the back-to-back capacitor banks switching, the inrush current arcs can locally melt the contact surfaces of vacuum interrupters (VIs) in prestrike processes. The condition of the contact surface can significantly influences the behaviors of the inrush current prestrike arcs. The objective of this paper is to determine the influence of contact plate slots on inrush...
Insulating liquid, because of high breakdown strength and superior self-recovery property, is widely applied to intense electron beam accelerator, transformer, and superconducting fault current limiters, etc. However, the formation of bubbles caused by heat transfer in power equipment seriously hurts the performance of the insulating strength in liquid. The objective of this paper is to study the...
The objective of this paper is to determine the dependence of field enhancement factor β on power frequency (50 Hz) voltage in vacuum. A rod-plane vacuum gap was designed in a vacuum interrupter. Shots of ac power frequency voltage were applied at three vacuum gaps till breakdown occurred and the three vacuum gaps were 1.0 mm, 0.8 mm and 0.5 mm, respectively. The field emission current and applied...
DC resistive type superconducting fault current limiters (SFCL) can be used in multi-terminal DC systems for fault current limiting. They help DC circuit breakers interrupt fault current with lower interruption overvoltage and they improve the interruption reliability. Insulation design is necessary for the application of SFCLs. The objective of this paper is to design the insulation of DC resistive...
The objective of this paper is to study the influence of microscopic electric field enhancement caused by microprotrusions on microparticle impact phenomena based on fractal modeling. In this paper, microprotrusions with a radius of $5~\mu \text{m}$ and heights 0, 1, 2, 5, and $10~\mu \text{m}$ are considered, according to the height–width ratios 0, 0.2, 0.4, 1, and 2, respectively. The microparticles...
The molten contact surfaces, which are caused by interrupting high currents in a vacuum interrupter (VI), can be induced to form Taylor cones by electrostatic force after current zero. Moreover, the deformation caused by the Taylor cones can further enhance the local electric field at their tips, which lead to breakdowns during post-arc phases, and make the interruptions fail. The objective of this...
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