变压器绕组线光纤嵌入过程的应变监测

Strain monitoring about embedding process of transformer winding optical fiber

光纤嵌入技术是实现变压器绕组分布式光纤传感的关键。变压器绕组在绕制过程中铜扁线需要进行一定程度的拉伸、弯曲和扭转,光纤在此过程中常会受到较大的拉伸而断裂。为了对光纤嵌入变压器绕组线的工艺过程进行优化,试验将200 m光纤嵌入到绕组线中,并使用光纤布喇格光栅(FBG)对绕组线的完整加工过程进行了应变监测,得到光纤在铜扁线绕制过程中不同环节所承受的应变值。试验结果表明:光纤在铜线绕制过程中所受到的最大应变均位于收线机位置,约4800με,在光纤的可承受范围之内;光纤在整个过程未折断且FBG未发生啁啾现象。

Optical fiber embedding technology is the key to realize distributed optical fiber sensing of transformer winding.In the winding process of transformer,the copper flat wire needs to be stretched,bent and twisted to a certain extent.In this process,the optical fiber is often stretched and broken.In order to optimize the process of embedding optical fiber into the winding line of transformer,200 m optical fiber is embedded into the winding line in the experiment,and the strain of the whole processing process of the winding line is monitored by using fiber Bragg grating(FBG),and the strain values of different links in the process of copper flat wire winding are obtained.The test results show that the maximum strain of the optical fiber in the process of copper wire winding is in the position of the take-up machine,about 4800με,which is within the tolerable range of the optical fiber.The optical fiber is not broken and the FBG does not chirp in the whole process.