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Tactile and Touchless Artificial Skins
In article number 2206830, Yifan Wang and co‐workers present a dual‐responsive artificial skin, which reacts to both pre‐contact events and tactile pressure levels. Overlooked valuable information encoded in the proximal inputs from environments can be explored. Versatile human–machine interfaces (HMIs) for tactile and touchless interactions are achieved. Moreover,...
The progress from intelligent interactions and supplemented/augmented reality requires artificial skins to shift from the single‐functional tactile paradigm. Dual‐responsive sensors that can both detect pre‐contact proximal events and tactile pressure levels enrich the perception dimensions and deliver additional cognitive information. Previous dual‐responsive sensors show very limited utilizations...
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...
The objective of this paper is to improve the fatigue life of a contact spring pin in a 126 kV vacuum circuit breaker (VCB). Firstly, the fatigue life of the contact spring pin during the opening or closing operation of the 126kV VCB is analyzed. Secondly, an orthogonal experimental method is used for the improvement of the fatigue life of the contact spring pin, in which three impact factors are...
The controlled switching technology of a short circuit current has been proposed for a long time. However, the opening time of the mechanism used in the high voltage circuit breaker is normally tens of milliseconds and has a variation of milliseconds. The electromagnetic repulsion mechanism has a very limited variation in the opening time. It provides a potential of achieving the controlled switching...
Predicting zeroes precisely and rapidly after a fault initiation is the basis of controlled fault interruption. However, none available algorithms could predict current zeroes within several milliseconds. The objective of this paper is to propose a fast estimation algorithm that can predict current zeros within 3ms after fault initiation. An algorithm is proposed based on an improved BP network. In...
The objective of this paper is to determinate the influence of grading capacitance on breakdown characteristics of a double-break vacuum interrupter. A prototype of double-break vacuum interrupter was built up as a U-type configuration with two 12 kV vacuum interrupters in series. The double-break vacuum interrupter is stressed by a power frequency withstand voltage and a lightning impulse withstand...
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...
With a capacity increase of the power system, the fault current increases very quick and it becomes a threat for other equipment in the power system. Vacuum interrupter combined with an electromagnetic repulsion mechanism can achieve a very fast opening operation. It can be designed to interrupt the high fault current approaching a zero-crossing point so that the interrupting capacity can be enhanced...
The stray parameters of a double-break vacuum circuit breaker (VCB) have a significant influence on the voltage distribution of the two breaks. The stray parameters are equivalent to two main equivalent capacitors. The two main equivalent capacitors are the equivalent break capacitor (C1) and the equivalent capacitor between the middle point of the two breaks and earth (C2). The objective of this...
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