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Study on Oil Flow Characteristics and Winding Temperature Distribution of Oil-immersed Transformer

Ye Chen, Chuan Luo, Wenjiao Xu, Guipeng Zhang, Biao Tang, Ling Wei, Zhengang Zhao
2021 Distributed Generation & Alternative Energy Journal  
The paper is of great significance as it examines the influence of the flow characteristics of oil channel on the winding temperature distribution.  ...  In the next stage, the authors have analyzed the temperature distribution, hot spot, position condition of the variable winding, the horizontal the oil channel width as well as the temperature of the winding  ...  and the National Natural Science Foundation of China under Grant 51567013.  ... 
doi:10.13052/dgaej2156-3306.3531 fatcat:igtyzn2oufdclmfuxwollykkay

Experimental and Numerical Investigation of the Internal Temperature of an Oil-Immersed Power Transformer with DOFS

Yunpeng Liu, Xinye Li, Huan Li, Jiaxue Wang, Xiaozhou Fan
2020 Applied Sciences  
To accurately detect and monitor the internal temperature of an operating power transformer, the distributed optical fiber sensor (DOFS) was creatively applied inside an oil-immersed 35 kV transformer  ...  On the former basis, the power transformer prototype with a completely global internal temperature sensing capability was successfully developed and it was also qualified for power grid operation through  ...  Conflicts of Interest: The authors declare no conflict of interest. Appl. Sci. 2020, 10, 5718  ... 
doi:10.3390/app10165718 fatcat:csgcqqgtmndarbbuh5tgcy5o2u

Research on Losses and Heat Dissipation of Saturable Reactor Used in Converter Valve

Kun Liu, Kai Li, Zhongting Chang, Caiyun Fan, Siquan Hu
2022 IEEE Access  
The maximum temperature of the case is about 68.5 • C, while the maximum temperature of the iron core is about 87.9 • C.  ...  The influence of the cooling circuit and air on the heat dissipation of the saturable reactor is studied.  ...  The optical fiber temperature sensors are embedded on the surface of the iron cores during the reactor manufacturing process so that the iron core temperatures can be monitored in real-time during the  ... 
doi:10.1109/access.2022.3148271 fatcat:ugsykuojdvfwjfsrmdermqw6ti

Review of Fiber Optic Diagnostic Techniques for Power Transformers

Janvier Sylvestre N'cho, Issouf Fofana
2020 Energies  
Flawlessly built-up fiber optic-based sensors provide online and offline assessment of various parameters like temperature, moisture, partial discharges, gas analyses, vibration, winding deformation, and  ...  To overcome such problems, fiber optic-based sensors for monitoring the condition of transformers have been developed.  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/en13071789 fatcat:qjuprzsye5cfpkbf6j4k23nyzq

Study on the Method of Calculating Temperature Rise of Transformer

Tao Li, Xiaoping Du, Xuewu Sun, Yuanyuan Song, A. Ghadouani, F. Wu
2020 E3S Web of Conferences  
The internal temperature of the transformer is a key parameter to measure the thermal state of the transformer.  ...  The service life of the transformer generally depends on the life of the insulating material, and high temperature is the main reason why cause insulation aging, this paper studies the temperature rise  ...  Winding temperature is generally measured by optical signal temperature sensor.  ... 
doi:10.1051/e3sconf/202017901027 fatcat:6c6rj4a4pfh7ljtojoftjm2l4y

Global Temperature Sensing for an Operating Power Transformer Based on Raman Scattering

Yunpeng Liu, Xinye Li, Huan Li, Xiaozhou Fan
2020 Sensors  
The as designed optical fiber sensor works stably all the time with a temperature accuracy of ±0.2 °C and spatial positioning accuracy of 0.8 m.  ...  Based on the obtained internal temperature distribution, Gaussian convolution was further applied for the signal processing and hereby, the hotspots for all the windings and iron cores could be accurately  ...  However, the iron core was composed of many layers of laminates and its structure was completely different from the windings, so the temperature distribution could be different.  ... 
doi:10.3390/s20174903 pmid:32872632 fatcat:fagdhr7dmve3ln6hfzu5h3u3ly

Polymer Optical Waveguide Sensor Based on Fe-Amino-Triazole Complex Molecular Switches

Muhammad Shaukat Khan, Hunain Farooq, Christopher Wittmund, Stephen Klimke, Roland Lachmayer, Franz Renz, Bernhard Roth
2021 Polymers  
The measurement of the optical power transmitted through the waveguide as a function of temperature exhibits a memory effect with a hysteresis width of approx. 12 °C and sensitivity of 0.08 mW/°C.  ...  For this purpose, the core of the waveguide is filled with a mixture of core material (NOA68), and the molecular complex using doctor blading and UV curing is applied for solidification.  ...  Data Availability Statement: The data presented in this study are available on request from the corresponding author. Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/polym13020195 pmid:33430376 fatcat:73ipkwq4evfnbgelbfq2mchykq

A reflective intensity modulated fiber tilt angle sensor based on an all-photonic crystal fiber interferometer

Yong Zhao, Xue-gang Li, Lu Cai
2016 Sensors and Actuators A-Physical  
A highly sensitive tilt angle sensor based on an all-photonic crystal fiber interferometer (All-PCFI) was proposed and demonstrated in this paper.  ...  In addition, the sensor could measure the tilt angle in all directions by demodulating signals of the four cantilever beams.  ...  The reason was Fig. 9 Fig 9 . 10 (a) spectra with the different temperature and the fitting of the one characteristic wavelength Considering temperature influences, the silica-based sensors exhibit low  ... 
doi:10.1016/j.sna.2016.04.030 fatcat:gyavmudu2rdfrczci2oxt4x54q

Optical fiber sensors: a route from University of Kent to Portugal

José L. Santos, António B. Lobo Ribeiro
2011 Photonic Sensors  
activity in Portugal in fiber sensing will be the core of this work.  ...  in the start-up and progress of optical fiber sensing activity in Portugal.  ...  Figure 18 shows a fiber optic Fabry-Perot sensing structure based on the utilization of a suspended-core fiber.  ... 
doi:10.1007/s13320-011-0027-2 fatcat:gnuzkkhgrfgqbghp4umeu5intm

A Prediction Model of Hot Spot Temperature for Split-Windings Traction Transformer Considering the Load Characteristics

Yi-Yi Zhang, Xing-Xiao Wei, Xian-Hao Fan, Ke-Wang, Ran-Zhuo, Wei Zhang, Shuo Liang, Jian Hao, Jiefeng Liu
2021 IEEE Access  
The temperature change of the iron core, LV windings, and HV windings is measured by the temperature sensor.  ...  Kweon measured the HST of the transformer, which was filled with mineral oil and natural ester liquid, respectively, with optical fiber sensors [13] . Based on the flow heat field calculation, Y.  ...  His major research interests include the field of condition assessment and insulation fault diagnosis for oilpaper insulation on high voltage apparatus. KE WANG was born in  ... 
doi:10.1109/access.2021.3056529 fatcat:b6nnitjiazajhmd7skgz3ldmiy

Study on the Application of Optical Current Sensor for Lightning Current Measurement of Transmission Line

Jin-ming Ge, Yan Shen, Wen-bin Yu, Yue Han, Fang-wei Duan
2019 Sensors  
This paper analyzes the influence of environmental factors on sensors, and combines the extreme environmental requirements, such as temperature and insulation requirements, to study the sensor.  ...  To measure lightning current data at different measurement locations in a transmission system, the limitations of traditional lightning current sensors are analyzed, and optical current sensing technology  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/s19235110 pmid:31766634 pmcid:PMC6928962 fatcat:5lfmg4i5brcdfdq5wqyvaxtiim

Optical Design of OCT with Gapped Magnetic Ring

Xiaoyi Su, Qifeng Xu
2013 Energy and Power Engineering  
The mathematics and physics model of OCT (Optical Current Transformer) with a gapped magnetic ring is briefly discussed in the paper.  ...  Based on the above, an OCT with 1000 A rated current is designed by using the ANSOFT Maxwell tools.  ...  Shi, "Theoretical Analysis of the Effect of the Temperature Features of Linear Birefringence on the Performance of an Optic-glass Current Sensor," Journal of Harbin Engineering University, Vol. 26, No.  ... 
doi:10.4236/epe.2013.53b003 fatcat:z2xj2q3hmrh35mqkxwcsqtspa4

Influence of Plasma Jet Temperature Profiles in Arc Discharge Methods of Carbon Nanotubes Synthesis

Grzegorz Raniszewski, Slawomir Wiak, Lukasz Pietrzak, Lukasz Szymanski, Zbigniew Kolacinski
2017 Nanomaterials  
This paper focuses on the influence of metal components on plasma-jet forming containing carbon nanotubes cathode deposit. The plasma jet temperature control system is presented.  ...  Stability of the plasma, and in effect stability of the temperature distribution, determines the quality of the final product.  ...  Author Contributions: Grzegorz Raniszewski, Lukasz Szymanski participated in the designing, modelling and construction of the research set-up. All authors discussed the structure of the manuscript.  ... 
doi:10.3390/nano7030050 pmid:28336884 pmcid:PMC5388153 fatcat:x7qaiyd2w5dejfg755zq77mdrm

The monitoring of an existing cast iron tunnel with distributed fibre optic sensing (DFOS)

C. Y. Gue, M. Wilcock, M. M. Alhaddad, M. Z. E. B. Elshafie, K. Soga, R. J. Mair
2015 Journal of Civil Structural Health Monitoring  
Distributed fibre optic sensing (DFOS) systems based on brillouin optical time domain reflectometry are able to provide continuous and distributed strain measurements to be taken along the entire length  ...  of, for example, an existing cast iron tunnel where the fibre optic cable length is fully attached.  ...  Open Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s)  ... 
doi:10.1007/s13349-015-0109-8 fatcat:ndcort5zcbbihn3p4nmkbgoqdu

Humidity sensing by fractally grown nanocomposites

B. N. Pal, S. Basu, D. Chakravorty
2005 Journal of Applied Physics  
and their humidity sensing properties Fractal structure of ␣-iron was grown within gel-derived silica films.  ...  Articles you may be interested in Highly sensitive and stable relative humidity sensors based on WO3 modified mesoporous silica Appl. Phys.  ...  ACKNOWLEDGMENTS Two of the authors ͑B.N.P.͒ and ͑S.B.͒ thank CSIR, New Delhi for the award of Senior Research Fellowships. Partial support was derived from a research grant of CSIR, New Delhi.  ... 
doi:10.1063/1.1845601 fatcat:m7skaxlhkveabedyguqsc6sr4e
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