The Electric-Field Analysis And Design Of The Sensor In Interferential Voltage Transducer

As power facilities are being developed toward higher voltages, all-fiber optical voltage transducer has become one of the focus in electric power system, the interferential voltage transducer in this paper is a sort of it. In this paper, the electric-field distruibution of the sensor in this transducer is researched, and the structure of the sensor is designed and optimized based on it.The voltage transducer in this paper is based on the converse piezoelectric effect of quartz, it can measure the voltage through the changes of differential phase which in the dual-mode fiber. There are metallic electrodes, dual-mode fibers, quartz and gas in the sensor of this transducer. The quartz is placed between the metallic electrodes, the elliptical-core dual-mode fiber is wound onto the circumferential surface of the quartz. The gas is air or mixed with air and SF6 . The sensor can bear 480 kV high voltage and ensure the normal measure.In this paper, the structure and fundamental principle of the all-fiber opticl voltage transducer are firstly discussed summarily. Then the method of analyzing the electric field of the sensor and calculating on computer are discussed, the characteristics of some methods are discussed in their reliable foundation of mathmatics and precision. The finite element method is choosed in this paper to build the mathmatics mode.Finally, the sensor structure is designed and its electric field is analysed by using the software ANSYS and the theory of the asymmetry electric field. The electric field's distribution charts of the sensor are plot. The better material and shape of the electrode are choosed. The insulating problems of the sensor are ensured.