Speed measurement method and device for high-speed power switch, and high-speed power switch

Abstract

The invention discloses a speed measurement method for a high-speed power switch. The method comprises the steps: dividing an optical signal into two ways, respectively transmitting the two ways of the optical signal through two fixed optical channels, and then converting the two ways of the optical signal into electric signals; setting one shading plate which moves with a moving contact of the high-speed power switch, and configuring the shading plate in a manner that one optical channel is cut off by the shading plate when the moving contact of the high-speed power switch is located at a switched-on position, and the other optical channel is cut off by the shading plate when the moving contact of the high-speed power switch is located at a switched-off position; and obtaining the movingtime, speed and acceleration of the moving contact of the high-speed power switch according to the electric signals outputted by the two optical channels. The invention also discloses a speed measurement device for the high-speed power switch, and the high-speed power switch. The device is simple in structure, is low in cost, is high in response speed, is high in resistance to vibration and electromagnetic interference, is high in reliability, and is good in corrosion resistance and the resistance to a high voltage.

Description

technical field [0001] The invention relates to a speed measuring method and device for a high-speed power switch. Background technique [0002] In recent years, with the rapid development of power supply systems in the fields of subways, light rails, ships, and power systems, the development of fast switches has become an inevitable trend to meet the low-end protection needs of DC transmission systems. When a short-circuit fault occurs in the system, the fast switch with reliable performance can be used to break the fault current in a short time, which can effectively protect the safety of electric equipment and personnel. [0003] The high-speed power switch based on the electromagnetic repulsion mechanism has a simple structure and fast opening and closing speed. Compared with high-power power electronic devices, the on-state loss is small. It has broad application prospects in many fields such as control switches. [0004] However, the contact movement speed and accele...

AI Technical Summary

Problems solved by technology

[0004] However, the contact movement speed and acceleration of the high-speed power switch based on the electromagnetic repulsion mechanism are much larger than that of the general switch. The traditional auxiliary contact position signal detection method is difficult to guarantee the mechanical life. It needs to be designed without external electromagnetic interference and has high reliability. detection method

Images