一种用于电力变压器局部放电在线监测的光纤传感器

Fiber Optic Sensors for Partial Discharge Monitoring in Power Transformers

描述了一种光纤声波传感器系统,这种传感器用于大型电力变压器中局部放电产生声波信号的在线监测。传感器采用融硅的共振腔和在融硅的玻璃管中形成囊状的单膜光纤来形成F-B干涉仪。干涉仪采用低相干性的光来进行干涉。实验结果表明研制的这种光纤声波传感器测量变压器油中传播的声波信号具有比较高的灵敏度和较宽的带宽。

This paper describes a fiber optic acoustic sensor system, which has been designed and tested for on - line detection of the acoustic waves generated by partial discharges inside high voltage power transformers. The sensor uses a fused silica diaphragm and a single mode optical fiber encapsulated in a fused silica glass tube to form an extrinsic Fabry - Perot interferometer, which is interrogated by a low - coherence light. Test results indicate that the developed fiber optic acoustic sensors are capable of detecting the acoustic signals propagating in transformer oil with high sensitivity and wide bandwidth.