Method for measuring disconnecting switch contact finger pressure based on optical fiber Bragg grating sensor

Abstract

The invention provides a method for measuring contact finger pressure of a disconnecting switch based on an optical fiber Bragg grating sensor, belonging to the technical field of photoelectron measurement. The device comprises an optical fiber Bragg grating displacement sensor, an optical fiber Bragg grating pressure sensor and the disconnecting switch; the optical fiber Bragg grating displacement sensor is fixedly arranged on a contact wall of a static contact of the disconnecting switch; and the optical fiber Bragg grating pressure sensor is fixedly arranged at the outer side of a spring of the disconnecting switch; and a formula in the specification is utilized to realize the accurate measurement of the contact finger pressure of the disconnecting switch. According to the method disclosed by the invention, the difference on temperature and pressure responses by a sensing grating is utilized to simultaneously measure temperature and pressure; and the method has stronger anti-electromagnetic interference capability, realizes online safety monitoring and accurate measurement on the disconnecting switch, and has stronger anti-interference capability.

Description

technical field [0001] The invention relates to a method for measuring the contact finger pressure of an isolating switch based on an optical fiber Bragg grating sensor, which belongs to the technical field of optoelectronic measurement. Background technique [0002] High-voltage isolating switches are widely used in power systems. They are the primary high-voltage power transmission and transformation equipment with the largest number of operating equipment in the power grid, and are the most prone to disrepair. They are also the most faulty type of power transmission and transformation equipment. Among them, the overheating fault defect of the high-voltage isolating switch caused by the contact finger pressure not meeting the requirements is more common. This is because the contact resistance of the main circuit will increase when the contact finger pressure of the isolating switch is reduced (the elasticity of the contact finger pressure spring is weakened), which will ca...

AI Technical Summary

Problems solved by technology

This measurement method must be measured when the power is off, and what is measured is not the real contact finger pressure generated when the moving contact is closed. It cannot implement real-time online safety monitoring of the contact finger pressure of the isolation switch, and cannot be timely Reflect the change of contact finger pressure of the isolating switch, and cannot accurately judge the safe closing position of the moving contact when closing

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