| 1 | Spatially continuous transformer online temperature monitoring based on distributed optical fibre sensing technology显示文摘Transformer internal thermal monitoring exists huge blind areas,and it is difficult for traditional methods to get fully distributed temperature in real time.In this contri-bution,the distributed optical fibre sensor was creatively applied inside an operating 35 kV oil‐immersed transformer which is also qualified for actual power grid oper-ation through the ex‐factory tests.Furthermore,the full‐region temperature along the windings and iron limbs were firstly monitored in a spatiotemporally continuous manner and the hotspots were also closely traced,fluctuating at 90%of the high‐voltage winding height(80%for low‐voltage winding)during the whole process of the heat‐run test.Corresponding Finite Element Method(FEM)for thermo‐fluid field calculation was then utilized for deeper analysis.On the former basis,the actual detected temperature distributions(both spatial and temporal)were compared with the International Electrotechnical Commission traditional model and some modifi-cations were suggested based on the real time measured data.This novel online monitoring application and the detailed internal thermal information may provide a solid reference for the delicate management of power transformers,which also offers a new horizon for the online monitoring in electrical apparatus industry. | Yunpeng Liu Xinye Li Huan Li Junyi Yin Jiaxue Wang Xiaozhou Fan | 2022 | High Voltage2022，7，2： | 1 |
| 2 | A high-performance multi-wavelength optical switch based on multiple Fano resonances in an all-dielectric metastructure显示文摘The multi-wavelength optical switch based on an all-dielectric metastructure consisting of four asymmetric semi-circular rings was designed and analyzed in this paper.Four Fano resonance modes,which can be explained by bound states in the continuum(BIC)theory,are excited in our structure with a maximum Q-factor of about 2450 and a modulation depth close to 100%.By changing the polarization direction of the incident light,the transmission amplitude of Fano resonances can get effectively modulated.Based on this tuning property,the metastructure can achieve a multi-wavelength optical switch in the near-infrared region(900—980 nm)and the maximum extinction ratio can reach 38.3 d B.In addition,the results indicate that the Fano resonances are sensitive to the changes in the refractive index.The sensitivity(S)and the figure of merit(FOM)are 197 nm/RIU and 492 RIU-1.The proposed metastructure has promising potential in applications such as optical switches,sensors,modulators and lasers. | CAO Shuangshuang FAN Xinye FANG Wenjing CHEN Huawei BAI Chenglin TONG Cunzhu | 2024 | Optoelectronics Letters2024，20，4： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员