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A design gauge pressure of an eco-friendly gas insulated switchgear (GIS) with an application of vacuum interrupters (VIs) ranges from 0.1 to 0.3MPa. Therefore, a high differential pressure is imposed on bellows of the VIs, which increases the fatigue failure risk of the bellows after cycles of operations. Although, there are some empirical equations recommended by the Chinese National Standard GB/T...
Researches on electromagnetic repulsion mechanisms are drawing more and more attention globally. The objective of this paper is to develop an electromagnetic repulsion mechanism for a 40.5 kV vacuum circuit breaker and then to make an optimization. Design of experiments (DOE) method are used to screen the prominent factors. Result shows that three impact factors are the prominent factors, which include...
Breakdowns in the post-arc phase are affected by a combination effect of both plasma and metal vapor. The objective of this paper is to study the breakdown boundary as a function of plasma and metal vapor density. A fully kinetic PIC-MCC model was developed to study breakdowns in the post-arc phase. Relevant collisions were taken into consideration, and an external circuit was added to the model to...
Gas-insulated metal-enclosed switchgears (GISs) are widely applied in the electrical power industry to transmit and distribute electrical energy because of the attractive dielectric and interrupting properties of sulfur hexafluoride (SF6). However, the use of SF6 may have a negative effect on the atmosphere and may contribute to global warming. This paper presents an eco-friendly switchgear: liquid-nitrogen-insulated...
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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