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2023 Power Electronics and Power System Conference, PEPSC 2023

作者： Chen, Long Chen, Tianxiang Wang, Xun Xiang, Xiaolei College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu China

ISBN: (纸本)9798350341294

As an important parameter characterizing the insulation performance of high-voltage equipment, tan delta is commonly used in the regular maintenance and fault inspection of high-voltage equipment. During the tan delta measurement of high-voltage equipment, it is found that the ambient humidity will affect the measurement results. In order to avoid this effect leading to the misjudgment of the insulation condition of the equipment. In this paper, a current transformer model LB6-110, which has been operated for more than 10 years, is taken as the test object, and the method of controlling the humidity change is adopted. Through five different test wiring methods to measure tanδ, summarize and analyze the effect of humidity on tan delta under different test wiring, and put forward the optimal wiring method to avoid the effect of humidity. © 2023 IEEE.

关键词： Electric instrument transformers

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Research on Fault of Vegetated Contact Phase of Low Voltage Distribution Lines 2

Research on Fault of Vegetated Contact Phase of Low Voltage ...

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2nd Asia Power and Electrical technology Conference, APET 2023

作者： Long, Chen Tian-Xiang, Chen Long-Shan, Yang Meng, Wang Chao-Xu, Zeng Sen, Yang College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu China

ISBN: (纸本)9798350359428

In order to study whether the vegetation touching single-phase conductor faults of low voltage distribution lines can lead to hill fires, a 400V low voltage bare conductor simulated tree line fault experimental platform was built. The possibility of vegetation ignition caused by vegetation contact fault in low voltage distribution lines is studied by analyzing the leakage current flowing through vegetation., the temperature rise of vegetation and the traces of carbonization on the surface. The results show that the bamboo with high water content touches the single-phase conductor fault temperature rise obviously., there are obvious charring traces near the fault point in the test., and the maximum temperature reaches 95.3 °C, the maximum leakage current is 180mA., and there is no discharge phenomenon in the test. High water content will limit the maximum temperature near the fault point to be less than the boiling point of water., and the temperature rise will accelerate the loss of water., leading to a decrease in leakage current., and eventually the temperature drop at the fault point gradually stabilizes., indicating that a single-phase conductor fault on a low voltage distribution line with vegetation touching it will not cause a fire. The results of the study are of great significance for the prevention of hill fires on low voltage distribution lines through forested areas. © 2023 IEEE.

关键词： Fires

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Study on a Non-collecting Atmospheric Radon Concentration Measurement System 23rd

Study on a Non-collecting Atmospheric Radon Concentration Me...

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23rd Pacific Basin nuclear Conference, PBNC 2022

作者： Tang, Chuanfeng Ge, Liangquan Guo, Shengliang Deng, Zhipeng Li, Jin College of Nuclear Technology and Automation Engineering Chengdu University of Technology Sichuan Chengdu China College of Nuclear Technology and Automation Engineering Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province Chengdu University of Technology Sichuan Chengdu China Chengdu Newray Technology Technology Co. Ltd. Sichuan Chengdu China

ISBN: (纸本)9789819910229

Radon in the atmosphere is an important tracer in meteorology and geology and an important index of environmental radioactivity level evaluation. In this paper, NaI (Tl) scintillator detector was developed to directly measure radon concentration in the atmosphere, and a mathematical model of atmospheric radon gamma measurement was proposed, which solved the technical problem of online real-time monitoring of atmospheric radon concentration. It has important scientific and practical value. In this paper, the characteristic gamma peaks of radon daughters 214Bi (609.31 keV) and 214Pb (351.92 keV) are respectively selected to calculate the radon concentration in the atmosphere. During the measurement period, the variation trend of radon concentration is the same as the theory, which suggests a higher concentration in the morning and a lower in the evening. Finally, the experimental measurement results were compared with the RAD7 radon measuring instrument. The error range of this detection system is 79.73% smaller than that of RAD7 on average, and its detection limit reaches 0.29 Bq/m3 with a 30-min-measurement at room temperature. This paper proves that it is feasible to directly measure the activity concentration of radon in the atmosphere. The atmospheric radon measurement method proposed in this paper can accurately obtain the concentration of atmospheric radon and has the advantages of convenience, large measuring range, low detection limit, and online measurement. © 2023, The Author(s).

关键词： Radioactivity

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Verification of Solver for Coupled Simulation of Fluid and Fuel Pin in LFR Based on Openfoam 23rd

Verification of Solver for Coupled Simulation of Fluid and F...

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23rd Pacific Basin nuclear Conference, PBNC 2022

作者： Ou, Wenlan Gong, Zhengyu Pan, Qiwen Zhang, Ling Dai, Jianing Gu, Zhixing College of Nuclear Technology and Automation Engineering Chengdu University of Technology Sichuan Chengdu China

ISBN: (纸本)9789819910229

The Computational Fluid Dynamics (CFD)-based thermal-hydraulics and safety analyses of Lead-based Fast Reactor (LFR) have attracted great attentions in recent years. Commercial CFD tools have been widely used in the 3D simulations of pool-type reactors owing to their powerful abilities in geometric modeling and meshing. Compared with the commercial CFD tools, OpenFOAM is a free open-source CFD code, which is more flexible to perform multi-physics coupling activities. In this paper, in order to develop a solver for simulating the coupled flow and heat transfer behaviors of fluid (coolant) and fuel pin in LFR, the fuel pin Heat Conduction (HC) model was coupled to the modified icoFoam solver of OpenFOAM. Verifications were conducted by the steady-state coupled simulation of fluid and fuel pin heat transfer behaviors, comparing with the MPC-LBE code which has been verified by the benchmarks for LFR fuel pin channel. The results simulated by the coupled solver proposed in this paper agreed well with the ones provided by the MPC-LBE code. This study lays a foundation for the further development of transient safety analysis code for LFR in our future work. © 2023, The Author(s).

关键词： Fast reactors

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Development and Verification of Solver for Natural Circulation Flow and Heat Transfer Simulation Base on Openfoam 23rd

Development and Verification of Solver for Natural Circulati...

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23rd Pacific Basin nuclear Conference, PBNC 2022

作者： Gong, Zhengyu Liang, Miao Ou, Wenlan Pan, Qiwen Zhang, Ling Gu, Zhixing College of Nuclear Technology and Automation Engineering Chengdu University of Technology Sichuan Chengdu China

ISBN: (纸本)9789811987793

For the advanced liquid metal cooled pool-type reactors, natural circulation of coolant is essentially important to ensure reactor safety under either normal or accident conditions, thus the thermal-hydraulic analysis of natural circulation behaviors is significant. Compared with the commercial Computational Fluid Dynamics (CFD) software, such ANSYS Fluent, OpenFOAM is one of the most common open-source CFD codes, which has more free programming environment and advantages of convenient function development. In this study, a new solver GTFoam for the natural circulation simulation was developed by adding energy conservative equation model and natural circulation model into the original icoFoam solver of OpenFOAM. For the above GTFoam solver, code verification was carried out by using the square cavity flow driven by regional heat source, and results were compared with the ones calculated by ANSYS Fluent. It was demonstrated that the results simulated by GTFoam solver agreed well with the ones calculated by ANSYS Fluent. This study can be used in the further development of transient safety analysis solver based on OpenFOAM for LFR in our future work. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Computational fluid dynamics

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Experimental Study on Impedance Characteristics of Trees under 10kV Voltage

Experimental Study on Impedance Characteristics of Trees und...

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2023 Panda Forum on Power and Energy, PandaFPE 2023

作者： Yang, Sen Zhao, Shenyuan Li, Linlin Chen, Tianxiang The College of Nuclear Technology and Automation Engineering Chengdu University of Technology Cheng Du China

ISBN: (纸本)9798350321173

The tree direct contact line is the fault type that has the greatest impact on the power system in the tree-line contradiction. At present, most of the existing studies are aimed at the monitoring and disposal of tree-line faults, but there are few studies on the impedance characteristics of trees when tree- line faults occur. Based on the 10k V simulated test line, this paper experimentally studies the change process, development trend and change characteristics of tree impedance when trees of different types, lengths and moisture contents have tree-line faults, as well as the influence of different system capacitive currents on fault characteristics. The experiment took three different species of pine, eucalyptus and bamboo as the test objects. The results showed that the impedance characteristics of the three different species of trees during tree line contact discharge were different, among which pine and eucalyptus had larger impedance and bamboo had smaller impedance. And the correlation between tree length and tree impedance is not strong. Under the premise of the same tree species, the impedance of the part with high moisture content is small, and the impedance of the part with low moisture content is large. In the time range of 0 20s, the impedance of trees decreases with the increase of discharge time. © 2023 IEEE.

关键词： Bamboo

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Research on Fire Time of Tree Line Fault Trees under 10kV Distribution Line 2

Research on Fire Time of Tree Line Fault Trees under 10kV Di...

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2nd Asia Power and Electrical technology Conference, APET 2023

作者： Yang, Sen Chen, Tianxiang Wang, Meng Zeng, Chaoxu Yang, Longshan Chen, Long The College of Nuclear Technology and Automation Engineering Chengdu University of Technology Cheng Du China

ISBN: (纸本)9798350359428

The tree direct contact line is the fault type that has the greatest impact on the power system in the tree-line contradiction. At present, most of the existing studies are aimed at the monitoring and disposal of tree line faults, but there are few studies on the fire time of tree line faults. Based on the 10kV simulated test line, this paper builds a tree line fault simulation test platform for 10 kV distribution lines. The common tree species under the transmission line in Sichuan are selected as test sample trees. The fire time of different types of trees after tree line failure is studied. The test study obtained the fire time of three kinds of trees under the condition of capacitance current of different lines to the ground. It was found that the fire time is not directly related to the tree and impedance. The main factors affecting the fire time are the thickness of the tree and the size of the capacitance current of the transmission line. The process of tree burning can be divided into 4 stages, namely: arc preheating stage, epidermal carbonization stage, water evaporation stage and branch burning stage, and can correspond to the changing trend of leakage current. The research results can provide technical reference for preventing wildfires caused by transmission line tree line faults. © 2023 IEEE.

关键词： Electric lines

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A method for correcting characteristic X-ray net peak count from drifted shadow peak

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nuclear Science and Techniques 2023年第11期34卷 155-167页

作者： Lin Tang Xing‑Ke Ma Kai‑Bo Shi Yeng‑Chai Soh Hong‑Tao Shen College of Electronic Information and Electrical Engineering Chengdu UniversityChengdu 610106China Guangxi Key Laboratory of Nuclear Physics and Nuclear Technology Guangxi Normal UniversityGuilin 541004China National Engineering Research Center for Agro-Ecological Big Data Analysis and Application Anhui UniversityHefei 230039China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyChengdu 610059China

To correct spectral peak drift and obtain more reliable net counts,this study proposes a long short-term memory(LSTM)model fused with a convolutional neural network(CNN)to accurately estimate the relevant parameters of a nuclear pulse signal by learning of samples.A predefined mathematical model was used to train the CNN-LSTM model and generate a dataset composed of distorted pulse *** trained model was validated using simulated *** relative errors in the amplitude estimation of pulse sequences with different degrees of distortion were obtained using triangular shaping,CNN-LSTM,and LSTM *** a result,for severely distorted pulses,the relative error of the CNN-LSTM model in estimating the pulse parameters was reduced by 14.35%compared with that of the triangular shaping *** slightly distorted pulses,the relative error of the CNN-LSTM model was reduced by 0.33%compared with that of the triangular shaping *** model was then evaluated considering two performance indicators,the correction ratio and the efficiency ratio,which represent the proportion of the increase in peak area of the two characteristic peak regions of interest(ROIs)to the peak area of the corrected characteristic peak ROI and the proportion of the increase in peak area of the two characteristic peak ROIs to the peak areas of the two shadow peak ROI,*** measurement results of the iron ore samples indicate that approximately 86.27%of the decreased peak area of the shadow peak ROI was corrected to the characteristic peak ROI,and the proportion of the corrected peak area to the peak area of the characteristic peak ROI was approximately 1.72%.The proposed CNN-LSTM model can be applied to X-ray energy spectrum correction,which is of great significance for X-ray spectroscopy and elemental content analyses.

关键词： Peak correction Triangular shaping Deep learning Long short-term memory Convolutional neural network X-ray fluorescence spectroscopy Silicon drift detector

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Study on the 3-D Natural Circulation Characteristics of LFR Under Steady State by Using Ansys Fluent 23rd

Study on the 3-D Natural Circulation Characteristics of LFR ...

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23rd Pacific Basin nuclear Conference, PBNC 2022

作者： Dai, Jianing Yan, Yulin Li, Erhao Gong, Zhengyu Zhang, Ling Gu, Zhixing College of Nuclear Technology and Automation Engineering Chengdu University of Technology Sichuan Chengdu China

ISBN: (纸本)9789819910229

As one of the Generation IV reactors, Lead-based Fast Reactor (LFR) has been considered to be great promising owing to its advantages in nuclear safety, sustainable development of nuclear energy and nuclear waste disposal. Owing to the excellent thermal expansion characteristics of Lead-based coolant materials, the primary cooling system of LFR can operate in natural circulation driven mode. The CFD (Computational Fluid Dynamics)-based thermal-hydraulics and safety analyses of nuclear reactors, especially liquid metal pool-type reactors have attracted great attentions in recent years. In this paper, the entire 3-D geometric model of a 10 MWth natural circulation driven LFR primary cooling system was established and simulated by ANSYS Fluent, in which the mesh was partitioned by utilizing structured meshing technology, and the porous medium model was utilized to fine the reactor core simulation. The results showed that the above LFR can operate safely in natural circulation mode, and has excellent natural circulation characteristics for the primary cooling system. © 2023, The Author(s).

关键词： Computational fluid dynamics

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Research on Application of Embedded AI in Fall Detection 5

Research on Application of Embedded AI in Fall Detection

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5th International Seminar on Artificial Intelligence, Networking and Information technology, AINIT 2024

作者： Liu, Yan Zhu, Xing College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu China College of Computers and Cyber Security Chengdu University of Technology Chengdu China

ISBN: (纸本)9798350385557

The traditional elderly fall detection system has some shortcomings, such as high false alarm rate and large delay, which limits its reliability and practicability in practical application. In order to timely and accurately notify the guardian of the old man's fall information, a low-power fall detection system based on em-bedded artificial intelligence is proposed. The system is based on low-power ARM processor, coupled with low-power and small-volume MEMS acceleration sensor. By designing the overall structure of the system, the peripheral circuits of ARM processor and MEMS acceleration sensor, and writing embedded programs and embedded artificial intelligence algorithms, the core functions such as data acquisition, fall identification and fall state transmission are realized. In the experiment, an algorithm model of FDNet (Fall Detection Network) is proposed, and a lot of tests and evaluations are carried out. The experimental results show that the system can achieve 98% accuracy on embedded devices. In addition, the system also shows excellent environmental adaptability, low power consumption and small size, which makes it suitable for fall detection and early warning in various occasions. The successful application of the system is expected to provide effective protection for the health and safety of the elderly. © 2024 IEEE.

关键词： Fall detection

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