Research On The Optical Current Transformer Based On Straight-through Thin Film Type

Current transformer is an important device in the power system which is electric energy metering and protection,measurement accuracy and reliability of its operation directly affect the safe operation of the power system.With the voltage level of power system improved,the conventional current transformer in the measurement and operation gradually exposed a number of shortcomings.Optical current transformer has some unique advantages,has attracted much attention and research.In this context,it research on the long-term stability of optic:al current transforler.For the problem of optical current transformer that reduces the stability of long?term operation in the practical,this paper is based on the theoretical model of passive optical current transformer,by simplifying the design of light path system;we propose a straight-through type optical current transformer light path system,by simplifying the light path enhances the stability of design system.And the light path system is made the simulation analysis;we obtained the design scheme of the light path that meets the requirements of the actual operation.Based on the straight-through-type optical current transformer light path system,we design one kind of thin-film and simplification optical current transformer system which establishes the system mathematical model by using the Jones matrix.According to the results of system modeling,it designs the system's the light source part,the Faraday rotating part and the photoelectric conversion part.Finally,the paper established the straight-film-type optical current transformer experimental system;the system's sensing materials adopts a new firm Bi-LaYICb the sensor head uses the straight-through and single light path detection structure,and the appropriate packaging method,makes no adhesion between the components and the stability of structure system,the loss rate,affected by mechanical stress can be optimized.Through analyzes and handles the experimental results,it proved the feasibility of the designed experimental structure and the practicality of Bi-LaYIG film material in the optical current transformer.