Research And Design Of Optical Electronic Current Transformer Based On Faraday Theory

Current transformer,as the main device of measurement,maintenance and other links in the power supply system,is the guarantee of stable operation,safe and effective power transmission of high voltage transmission system.However,current transformers in trial operation are prone to saturation,complex installation,difficult insulation and other problems.Optical current transformer has the advantages of wide band,small size and convenient installation.At present,the research of new magneto-optic materials has also made great progress,but the actual application of current transformer research work is less,and there is little systematic research on its response characteristics.At the same time,the optical current transformer is easy to introduce noise signal in the photoelectric conversion process,which seriously affects the SNR of the current transformer.In order to solve the above problems,in-depth research on the material and structure improvement of sensing unit and signal processing system were conducted.The main work included:Firstly,an optical current transformer was designed using TGG crystal with high Verdet constant,and the low frequency noise from the photoelectric conversion part of the system was analyzed.At the same time,a current transformer test platform was built to test the sensor’s sensing characteristics.Secondly,the signal processing system was designed based on FPGA technology,the program logic was designed by Quartus II software,and the EP3C55F484I7 chip of Altera company was utilized as the main control chip of system.The signal processing mainly aims at filtering the noise which appears in the photoelectric conversion link.The response characteristics of current transformer were analyzed by using the current transformer test platform.The experiment result that the current transformer has good sensing characteristic,the sensing coefficient is 0.0683 ± 0.0002,and the measuring error can be controlled less than 0.2%,which meets the monitoring requirement of high voltage fence.Figure 53;Table 2;Reference 60...