Partial Discharge Ultrasound Detection Using the Sagnac Interferometer System.
Partial Discharge Ultrasound Detection Using the Sagnac Interferometer System.
复制标题
使用 Sagnac 干涉仪系统进行局部放电超声检测
DOI：
10.3390/s18051425
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发表时间：
2018-05-04
期刊：
影响因子：
--
通讯作者：
Jin B
中科院分区：
文献类型：
--
作者：
Wang Y;Li X;Gao Y;Zhang H;Wang D;Jin B
局部放电检测是电力电缆安全评估的关键。局部放电过程中频繁产生的超声信号包含重要的特征信息。然而，传统的超声换能器在高电压、强磁场环境中容易受到强电磁干扰。为了解决这一问题，提出了一种用于局部放电超声检测的光纤Sagnac干涉仪系统。首次实现了对由压电式超声换能器激励的超声信号的光纤传感和时频分析。在设计的10KV局部放电模拟装置的帮助下，Sagnac干涉仪系统的有效频带可达175 kHz。利用累积直方图法，该光纤局部放电检测系统的局部放电特征超声频带在28.9~57.6 kHz之间。这种新型超声波传感器可以作为一种理想的超声源，用于爆炸环境中局部放电的本质安全检测。
Partial discharge detection is crucial for electrical cable safety evaluation. The ultrasonic signals frequently generated in the partial discharge process contains important characteristic information. However, traditional ultrasonic transducers are easily subject to strong electromagnetic interference in environments with high voltages and strong magnetic fields. In order to overcome this problem, an optical fiber Sagnac interferometer system is proposed for partial discharge ultrasound detection. Optical fiber sensing and time-frequency analysis of the ultrasonic signals excited by the piezoelectric ultrasonic transducer is realized for the first time. The effective frequency band of the Sagnac interferometer system was up to 175 kHz with the help of a designed 10 kV partial discharge simulator device. Using the cumulative histogram method, the characteristic ultrasonic frequency band of the partial discharges was between 28.9 kHz and 57.6 kHz for this optical fiber partial discharge detection system. This new ultrasound sensor can be used as an ideal ultrasonic source for the intrinsically safe detection of partial discharges in an explosive environment.
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