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Fiber Optic Sensor for Acoustic Detection of Partial Discharges in Oil-Paper Insulated Electrical Systems

机译:用于声光检测油纸绝缘电气系统中局部放电的光纤传感器

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摘要

A fiber optic interferometric sensor with an intrinsic transducer along a length of the fiber is presented for ultrasound measurements of the acoustic emission from partial discharges inside oil-filled power apparatus. The sensor is designed for high sensitivity measurements in a harsh electromagnetic field environment, with wide temperature changes and immersion in oil. It allows enough sensitivity for the application, for which the acoustic pressure is in the range of units of Pa at a frequency of 150 kHz. In addition, the accessibility to the sensing region is guaranteed by immune fiber-optic cables and the optical phase sensor output. The sensor design is a compact and rugged coil of fiber. In addition to a complete calibration, the in-situ results show that two types of partial discharges are measured through their acoustic emissions with the sensor immersed in oil.
机译:提出了一种具有沿光纤长度的内在换能器的光纤干涉传感器,用于超声波测量充油功率设备内部局部放电的声发射。该传感器专为在恶劣的电磁场环境中进行高灵敏度测量而设计,温度变化大且浸在油中。对于在150 kHz频率下声压在Pa单位范围内的应用,它具有足够的灵敏度。此外,免疫光纤电缆和光学相位传感器输出确保了对感应区域的可及性。传感器设计是紧凑而坚固的纤维线圈。除了进行完全校准外,现场结果还表明,通过将传感器浸入油中的声发射,可以测量两种类型的局部放电。

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