高压电器2025，Vol.61Issue(3)：152-159,8.DOI:10.13296/j.1001-1609.hva.2025.03.018
基于声光调制及RF相位检波的光纤干涉型局部放电超声传感方法研究
Study on Fiber Interferometric Partial Discharge Ultrasonic Sensing Method Based on Acoustic-optic Modulation and RF Phase Detection
摘要
Abstract
Real-time monitoring of transformer status is crucial to the safe and stable operation of power systems.Detection of partial discharge signal in transformers to find potential insulation defects can improve greatly the safe-ty and reliability of high-voltage transformers in power systems.In view of the stability of optical fiber sensing of par-tial discharge ultrasonic signal in this paper,the study on anti-interference and modulation technology of the optical ultrasonic signal is developed.The influence mechanism of environmental noise on the stability of the sensing sys-tem is analyzed.For improving stability of the system,an acoustic-optic modulator is introduced to transfer the phase information to be measured to a high-frequency carrier,and a phase hardware demodulation scheme based on an RF gain-phase detector is adopted.A fiber optic interference ultrasonic sensing system is set up,which elimi-nates the influence of phase fading problem existing in traditional interference topology on the measurement result.Finally,an experimental platform is set up in this paper to realize the external sensing of partial discharge acoustic emission based on optical fiber sensing.The signal-to-noise ratio of the improved optical fiber ultrasonic sensor is 14.5 dB higher than that of traditional PZT.At the same time of noise and interference resistance,the lower limit of partial discharge detection is 21.83%lower than that of PZT,and the detection sensitivity of partial discharge is 5.3 times higher than that of PZT.It has lower detection lower limit and higher ultrasonic signal detection sensitivity.关键词
局部放电/光纤超声传感/声光调制/RF相位检波Key words
partial discharge/fiber-optic ultrasonic sensing/acoustic-optic modulation/RF phase demodulation引用本文复制引用
邢超,乔辉,田源,赵军,高树国,史荣斌,马国明..基于声光调制及RF相位检波的光纤干涉型局部放电超声传感方法研究[J].高压电器,2025,61(3):152-159,8.基金项目
国网河北省电力有限公司科技项目(kj2021-215).Project Supported by Science and Technology Project of State Grid Hebei Electric Power Co.(kj2021-215). （kj2021-215）
