The Research On The Measurement Of The Icing And Galloping Transmission Line Based On The Combined Distributed Optical Fiber Sensor

The electricity grid has become an important basic industry.However,in the transmission process,the icing and galloping occur frequently due to the complicated terrain.However,the traditional electric ice-covered dancing detection technology has a high cost,and can not completely cover the grid.They have unstable operation in a high voltage environment,and they are lack of power supply.The whole distributed fiber optic sensing technology to the entire fiber as a sensor unit can overcome the above deficiencies,with its good anti-jamming,full distributed,and passive characteristics?At present,there are still three problems in the application of distributed optical fiber sensing technology in power grid:First,the amount of spectrum fitting data is much more time consuming,and thus we can not achieve real-time measurement.Second,there is no temperature and strain separation factor in the actual environment.If we use the separation factor in the laboratory directly,the result will be in a serious decline in precision after separation.Third,ice-covered dancing is caused by temperature,humidity,geographical environment and other factors together.When we only use a single parameter to monitor the ice-dancing event,it can only reflect a factor.So it is often accompanied by high false negative rate.It is not only difficult to achieve early warning of potential accidents,but also to the application of engineering to bring difficulties.In view of the above problems,multi-parameter monitoring is carried out by using combined distributed optical fiber sensor.In the process of spectrum fitting,a fast peak finding algorithm is designed in this paper.Select the point near the peak to carry out the polynomial fitting based on the least squares fitting.After obtaining the equation,we obtain the frequency shift and the peak power according to the coefficient.The algorithm at the same accuracy,the speed doubled,so as to ensure real-time monitoring.A method for calibrating the temperature coefficient of Brillouin temperature is proposed to realize the separation of temperature and strain.The method can select the optical fiber connection area to realize the rapid calibration in the field environment.We design a multi-parameter monitoring and forecasting scheme,to monitor monitoring of temperature,stress and vibration changes in real-time along the cable based on converged distributed fiber optic sensing technology.Through the comprehensive analysis of the three parameters,we can effectively reflect the micro-climate change along the cable using accumulated temperature,local severe weather changes and the temperature difference between the two lines of temperature.In the field the monitoring was carried out,and the experimental data show that the temperature within a month along the cable reflect the local microclimate.We analysis the ice-dancing state through the measured data.Temperature variation along the cable within one month monitoring reflects small local climate change.It is possible to predict the temperature of the ipsilateral temperature by comparing the temperature difference between the day and night,and it can predict the temperature of the ice.In the area where the probability of icing is high,and the stress of the optical fiber becomes larger.In the region of the vibration spectrum,it can be observed in the wind weather dancing and accompanied by snow.The galloping range is successfully determined by the vibration information and the dancing center position is located.Combined with accumulated temperature results can be judged that the region will continue to grow ice.To sum up,the program can achieve the ice-dancing event monitoring and prediction,and improve the accuracy of the incident.It is suitable for monitoring in areas where manual inspection is not convenient.