基于分布式光纤传感的变压器绕组变形定位技术  

Transformer Winding Deformation Location Based on Distributed Optical Fiber

作　　者：徐征宇 李鹏 张书琦 汪佐宪 程涣超 XU Zhengyu;LI Peng;ZHANG Shuqi;WANG Zuoxian;CHENG Huanchao(China Electric Power Research Institute Co.,Ltd.,Haidian District,Beijing 100192,China)

机构地区：[1]中国电力科学研究院有限公司,北京市海淀区100192

出　　处：《电网技术》2022年第8期3224-3230,共7页Power System Technology

基　　金：国家自然科学基金“多次短路冲击累积效应对变压器动热稳定影响机理及评估方法研究”(U2166213)。

摘　　要：将分布式光纤传感技术应用于变压器突发短路试验有助于绕组变形的准确定位。研制了1台10k V油浸式变压器模型并进行了30%~70%短路负载电流下的突发短路试验,基于布里渊散射的光时域反射技术获得了低压b相绕组的发热规律和形变规律。结果表明,30%~60%短路负载电流下绕组产生一定热效应,布里渊频率从2.585MHz正向移动到12.166MHz,温升从1.62K增加到8.34K,该电流范围内绕组几乎无变形;70%短路负载电流时,布里渊频率出现负向移动,并沿绕组长度方向周期性变化,应变最大值为-540με。最后,变压器拆解验证了分析的准确性。研究结论为变压器绕组变形的监测提供了新思路。The application of the distributed optical fiber sensing technology to the sudden short-circuit test of a transformer is helpful for the location of the winding deformation. A 10 k V oil-immersed transformer was developed and a short-circuit test under 30%~70% short-circuit current was carried out. Based on the Brillouin scattering optical time domain reflection technique, the heating and deformation laws of the low-voltage b-phase winding were obtained. The results show that the winding has some heating effects under the short-circuit load current of 30% to 60%. The Brillouin frequency moves forward from 2.585 MHz to 12.166 MHz, and the temperature rises from 1.62 K to 8.34 K. There is almost no deformation of the winding in this current range. At 70% short-circuit current, the Brillouin frequency shifts in the negative direction and changes periodically along the length of the winding with the maximum strain-540με. Finally, the disassembled transformer verifies the accuracy of the analysis. The research conclusion provides a new idea for the monitoring of the transformer winding deformation.

关 键 词：变压器 突发短路 分布式光纤 应变 布里渊频率 

分 类 号：TM721[电气工程—电力系统及自动化]