Switch closing holding device and vacuum switch

By using piezoelectric actuators and friction surface structures in vacuum switches, the mechanical fatigue problem caused by closing holding force is solved, enabling fast and reliable closing holding and opening, and improving the mechanical reliability and opening speed of the equipment.

CN121394237AActive Publication Date: 2026-01-23GUANGDONG POWER GRID CO LTD +1
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Patent Information

Application Number
CN202511976002.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-25
Publication Date
2026-01-23
Estimated Expiration
2045-12-25

AI Technical Summary

Technical Problem

The closing holding force of existing vacuum switches mainly relies on springs or permanent magnets in a high potential energy state, which leads to mechanical stress fatigue and reduced lifespan, while also limiting further improvement in opening speed.

Method used

It employs a piezoelectric actuator and a friction surface structure. The piezoelectric actuator generates friction force by inducing current signal through the energy harvesting coil, thereby achieving closed-circuit holding. It utilizes the piezoelectric effect to provide fast and reliable closed-circuit holding force, and achieves fast opening through an electronic switch.

Benefits of technology

It improves the reliability of closing and holding and the speed of opening, reduces mechanical wear, extends equipment life, and reduces operating power consumption and cost.

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Abstract

The invention relates to a switch closing holding device and a vacuum switch. The device comprises a piezoelectric actuator, an energy taking coil arranged on a main loop of the vacuum switch, and a first friction surface and a second friction surface which are arranged in parallel, wherein the input end of the piezoelectric actuator is connected with the output end of the energy taking coil, the output end of the piezoelectric actuator is connected with the first friction surface, and the second friction surface is fixed on an operating mechanism transmission rod of the vacuum switch; the energy taking coil is used for sensing a current signal on the main loop and outputting a corresponding voltage signal to the piezoelectric actuator according to the current signal; the piezoelectric actuator is used for applying a driving force to the first friction surface under the condition that the change amplitude of the detected voltage signal is greater than a preset threshold value; the driving force is used for driving the first friction surface and the second friction surface to generate friction force, so that the vacuum switch is kept in a closed state under a short-circuit fault. The device can ensure that the switch is kept in a closed state during a fault.
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