1. Key Laboratory of Engineering Dielectrics and Its Application Ministry of Education School of Electrical and Electronic Engineering Harbin University of Science and Technology Harbin 150080 China 2. FuTong Group Co. Ltd Hangzhou 311400 China
Abstract：The extrinsic fiber Fabry-Perot (F-P) sensor placed in the liquid insulation of power equipment for partial discharge (PD) acoustics detection faces the problem of lower sensitivity. Due to the influence of the sound pressure distribution in different media on the sensitivity, the transient processes were simulated and analyzed by the finite element method in the sound field when the acoustic energy transferred through the liquid-solid media. The value of sound pressure in liquid-solid-liquid medium was compared with that in liquid medium, and the influence of physical parameters of solid material on sound pressure value was analyzed. Then, a method for enhancing the sound pressure by using a composite medium structure is proposed to improve the F-P sensitivity of PD detection. PZT and plate-plate electrodes were used as continuous ultrasonic and PD acoustic source respectively, and the response amplitudes of F-P sensor were compared in liquid and liquid-solid-liquid media. The results show that the acoustic coupling structure of liquid-solid-liquid material can enhance the sound pressure. The magnitude of enhancement is related to two factors: the distance between F-P sensor and the solid medium; the physical parameters of solid material. The amplitude of the F-P sensor for PD measurement in liquid-solid-liquid medium is about twice that in pure liquid medium.
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2019, Vol. 34 
