油浸式变压器铁芯热损在温升试验在线监测

The FBG on-line monitoring of Oil-immersed transformer core heat loss in the temperature rise test

针对油浸式变压器铁芯损耗特征进行有限元分析,仿真计算铁芯的热点位置和温升范围。设计适用于铁芯温度监测的光纤传感器、耦合器和贯通器。并将传感器进行温循长期稳定性测试,传感器线性度分别由-0.153%FS和0.113%FS降低为0.0393%FS和0.0113%FS。建立FBG传感模型,搭建传感网络,采集温升数据显示:纵向最高温度时,上轭温度高于下轭12.4℃;横向温度上:相比铁芯,绕组对测试项目响应及时,上部绕组最高温度为82.15℃,下部绕组最高温度为70.59℃。实现了铁芯热损温度的FBG在线监测。

The core hot spot location and temperature range is simulated in view of the the finite element analysis of oil-immersed transformer core loss. It designs optical fiber sensors, coupler and optical fiber connector. Long term stability of the sensor is tested. The linearity reduce to 0.0393%FS and 0.0113%FS from -0.153% and 0.113%FS. FBG sensing model is set up and a sensor network is established. Temperature data shows that： the upper yoke is higher than the lower yoke 12.4℃ on longitudinal temperature. The winding response of test is timely compared with the core. The highest temperature of upper winding and lower winding is 82.15 ℃ and 70.59℃ on transverse temperature. It is realized that the FBG monitoring ofoil immersed transformer iron core heat loss.