Research On Fiber Bragg Grating Detection Of Wind Deflection Angle Of Transmission Line Insulator

Transmission line is the carrier of transmitting current and electric energy and one of the key part of the whole power system structure.Transmission line failures due to wind deflection occurs frequently.However,this kind of trip due to wind deflection is not easy to recover,it will lead to power outages and power loss,also has a bad influence on economy and society.At present,the principle of high voltage transmission line's wind deflection is analyzed by using a rigid body rod model in theory.This method is convenient for engineering design and measurement.Online monitoring of monsoon,mainly adopt electronic sensor monitoring method and image monitoring method,and the power supply of the above two methods are susceptible to electromagnetic interference problem.With the development of the optical fiber sensing technology and its resistance to electromagnetic interference ability,wide measuring range,high precision and real-time monitoring is strong wait for an advantage,transmission line monitoring using the optical fiber sensing technology gradually detection of transmission line of the monsoon.This paper,taking a 110 kV tower in Yunnan province as the research object,the main completed the following several aspects of the research:(1)The load model of suspension insulator monsoon,to affect the size of the wind Angle parameters are analyzed,and according to the actual parameters are calculated by 10 m/s,15 m/s,lee 30 m/s wind speed value of the Angle.Using ABAQUS finite element software to establish the finite element model of 110 k V suspension insulator string,respectively the simulation conclusion 10 m/s,15 m/s,deformation and displacement under 30 m/s wind speed,and compares the theoretical calculation value analysis.The comparative analysis results show that the relative errors of the horizontal displacement's maximum is 0.50% and the vertical displacement's maximum is 1.19% at wind speeds of 10 m/s.The relative errors of the horizontal displacement's maximum is 0.23% and the vertical displacement's maximum is 1.72% at wind speeds of 15m/s.The relative errors of the horizontal displacement's maximum is 0.46% and the vertical displacement's maximum is 0.91% at wind speeds of 30 m/s.(2)According to the characteristics of the windage angle,the working principle of the fiber Bragg grating inclination sensor was studied.The calibration experiment of the tilt sensor was carried out in the laboratory.The linearity of the fiber Bragg grating inclination sensor was calculated as 2.89% and the sensitivity was 15.401pm/°.The fiber demodulation was able to recognize that the minimum wavelength was 1 pm.Therefore,the minimum angle that the sensor could resolve was 0.065° and the return error was 1.13%.(3)The tilt angle sensor and the load cell are assembled on the top of a suspension insulator string by using a hoop clamp,and the tilt angle sensor is used to measure the magnitude of the wind deflection angle of the insulator string.From the monitored data,it shows that the fluctuation of the windage angle is affected in the wind speed changing and the speed of change increases.Therefore,the monitoring of the windage angle of suspension insulator strings provides the reference for the safe operation of transmission lines.