With the continuous deepening of marketization of power grids and the continuous improvement of power reliability and quality requirements,the power industry is facing unprecedented challenges and opportunities.The leakage current of insulator string is one of the important monitoring objects of transmission line,and its effective monitoring is receiving more and more attention.At present,the monitoring of insulator string leakage current mainly depends on electronic measurement and wireless public network transmission.As electronic measuring devices are usually installed in complex high magnetic fields and complex geographical conditions,electronic measuring devices are prone to high failure rates,lack of reliability,and unsafe data transmission during long-term operation.Therefore,it is of great value to study the new insulator string leakage current measurement technology with the characteristics of passive and anti-electromagnetic interference.In this dissertation,the research on the measurement and implementation of insulator string leakage current measurement based on optical fiber sensing technology is carried out.The main research work and achievements are as follows:1.Three types of fiber-optic passive leakage current measurement schemes based on Rogowski coil,micro motor,coil and cantilever are designed,and their feasibility and performance are analyzed theoretically and modeled respectively.Finally,the fiber-optic passive-insulator string leakage current measurement scheme based on coil and cantilever is optimized.2.Design a real-time fiber optic passive leakage current monitoring system,the system is divided into test data acquisition module,data transmission channel,optical signal transmitting and receiving module,data processing module and display module.Through the actual system construction and operation test,it proves that the system has high stability and small error.3.The test of frequency,amplitude and amplitude-frequency curve of the fiber-optic passive insulator string leakage current measuring device based on coil and cantilever beam is carried out,and the problem of inaccurate data caused by external low-frequency vibration interference is solved.At the same time in China Institute of Metrology and China Electric Power Research Institute on the accuracy of the measuring device test,the experimental results show that the device has a certain practical value. |