Based On Fiber Bragg Grating Pressure Isolation Switch Finger Pressure Detection Technology Research

High voltage disconnect switch is widely used in power systems. Power grid equipment. The largest number of the most vulnerable to the dilapidated high-voltage transmission and distribution equipment, is also malfunctioning transmission and distribution equipment. The finger touch pressure to meet the requirements arising from the isolation switch overheating fault defects. Isolation switch finger touch pressure to reduce the isolation switch touch refers to the compression spring bombs decreased. Leading to the main circuit contact resistance increases, causing the contact heat caused by the contact surface after oxidation, leading to further increase in contact resistance It is very necessary to further increase the contact resistance of the main circuit. The isolation switch contacts fever is more powerful a vicious circle, arc welding to produce serious. Cause accidents, real-time online monitoring of finger touch pressure to the isolation switch. Currently. The detection of finger touch pressure isolation switch analog isolation switch moving contact method. But this measurement must be in when power measurement, and the measurement is not really moving contact closing refers to the pressure of touch can not be timely to reflect the isolation switch contact means pressure changes can not be real-time online safety monitoring implementation of the isolation switch finger touch pressure.This article relates to a high voltage disconnect switch based on fiber Bragg grating finger touch pressure detection method. Detection of finger touch pressure to the isolation switch, and a theoretical analysis and experimental research. The main research work are as follows:(1) To design a fiber Bragg grating pressure sensor installed on the high voltage disconnect switch, and a tensile-type displacement gauge conversion and compression of fiber Bragg grating displacement sensor.(2) Fiber Bragg grating pressure sensor installed in the isolation switch compression spring at the moving contact of the fiber Bragg grating displacement sensor installed two finger touch the middle of the isolating switch. Isolation switch contact means bend part at different distances from the fixed end the same cross-sectional area, will isolate the bend part of the switch contact means equivalent to a cross-section cantilever beam. The equivalent diagram to analyze mathematical sensor model Finally. The theory of isolation switch contact means pressure.(3) Theoretical calculations of fiber Bragg grating displacement sensor sensors and sensor performance parameters of fiber Bragg grating pressure sensor, and its actual performance is verified by experiments. Theoretical and experimental comparison and analysis.(4) Show the displacement of the center wavelength of fiber Bragg grating in the fiber Bragg grating displacement sensor with a vernier caliper is a linear relationship between the nonlinear error is0.49%FS. Displacement response sensitivity45.0pm/mm hysteresis to0.25%FS maximum repeatability error were as follows:to increase the displacement R=0.30%FS. To reduce the displacement R=0.25%FS.(5) The center wavelength of fiber Bragg grating in the fiber Bragg grating pressure sensor with the weight of the weight of a linear relationship between the nonlinear error of1.8%FS. Load response sensitivity90.9pm/Kg, and hysteresis is1.13%FS. The maximum repeatability error:load R=2.3%FS, uninstall R=2.28%FS.(6) Fiber Bragg grating high-voltage isolating switch detection method of the detection system were discussed, and do a comparison and analysis.