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2nd Asia Power and Electrical technology Conference, APET 2023

作者： Longshan, Yang Tianxiang, Chen Shuyue, Wang Xun, Wang College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu China

ISBN: (纸本)9798350359428

Cascade voltage transformers (hereinafter referred to as CTV) are widely used in power grids, and a good insulation condition is a prerequisite for their safe and reliable operation. 110kV CTV tan δ can be affected by changes in environmental factors (such as temperature and humidity), and sometimes the tanδ can be abnormal or even fail to reflect the actual state of the equipment. This paper takes a JCC6-110 CTV which has been operated for many years as the research object, and makes a comprehensive and detailed study on the influence of temperature on CTV tanδ, and researches the change of CTV tanδ under different temperature conditions, proposes the CTV insulation equivalent circuit model, obtains tanδ and capacity data through different wiring methods and derives the model parameters, and establishes the insulation equivalent circuit model influenced by temperature factors. The insulation equivalent circuit model with the influence of temperature factors is proposed, and the method of correcting tanδ to the standard atmospheric conditions is proposed. The model was simulated using MATLAB/Simulink software to verify the correctness of the insulation equivalent circuit model considering the effect of temperature on tanδ under fault conditions, and the model can be applied to the conversion and correction of the effect of temperature on CTV tanδ during field testing. © 2023 IEEE.

关键词： Timing circuits

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Experimental Study on the Effect of Humidity on the Tanδ of 110kV Oil-Immersed Current Transformer

Experimental Study on the Effect of Humidity on the Tanδ of...

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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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Quantitative algorithm for airborne gamma spectrum of large sample based on improved shuffled frog leaping-particle swarm optimization convolutional neural network

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nuclear Science and Techniques 2023年第7期34卷 242-252页

作者： Fei Li Xiao-Fei Huang Yue-Lu Chen Bing-Hai Li Tang Wang Feng Cheng Guo-Qiang Zeng Mu-Hao Zhang College of Nuclear Technology and Automation Engineering Chengdu University of TechnologyChengdu 610000China Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province Chengdu 610000China Airborne Survey and Remote Sensing Center of Nuclear Industry Shijiazhuang 050000China Hebei Key Laboratory of Airborne Detection and Remote Sensing Technology Shijiazhuang 050000China

In airborne gamma ray spectrum processing,different analysis methods,technical requirements,analysis models,and calculation methods need to be *** meet the engineering practice requirements of airborne gamma-ray measurements and improve computational efficiency,an improved shuffled frog leaping algorithm-particle swarm optimization convolutional neural network(SFLA-PSO CNN)for large-sample quantitative analysis of airborne gamma-ray spectra is proposed *** method was used to train the weight of the neural network,optimize the structure of the network,delete redundant connections,and enable the neural network to acquire the capability of quantitative spectrum *** full-spectrum data processing,this method can perform the functions of energy spectrum peak searching and peak area *** network training,the mean SNR and RMSE of the spectral lines were 31.27 and 2.75,respectively,satisfying the demand for noise *** test the processing ability of the algorithm in large samples of airborne gamma spectra,this study considered the measured data from the Saihangaobi survey area as an example to conduct data spectral *** results show that calculation of the single-peak area takes only 0.13~0.15 ms,and the average relative errors of the peak area in the U,Th,and K spectra are 3.11,9.50,and 6.18%,indicating the high processing efficiency and accuracy of this *** performance of the model can be further improved by optimizing related parameters,but it can already meet the requirements of practical engineering *** study provides a new idea for the full-spectrum processing of airborne gamma rays.

关键词： Large sample Airborne gamma spectrum(AGS) Shuffled frog leaping algorithm(SFLA) Particle swarm optimization(PSO) Convolutional neural network(CNN)

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The Influence of Radiation Distance on Microwave Coupling Efficiency in Microwave-assisted Rock Breakage

The Influence of Radiation Distance on Microwave Coupling Ef...

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2024 Photonics and Electromagnetics Research Symposium, PIERS 2024

作者： Zhao, Xiaoyun Chengdu University of Technology School of Nuclear Technology and Automation Engineering Chengdu610059 China

ISBN: (纸本)9798350375909

High power microwave early irradiation has a great potential in assisting excavators in breaking hard and abrasive rocks, radiation efficiency is a very important issue. The paper studied the radiation of standard rectangular waveguides on rocks at different working distances, obtained the minimum S11 parameter through CST simulation, and determined the corresponding optimal radiation position, at a working distance of 0.31λ, the S11 is minimum, which is the optimal position of the sample relative to the microwave antenna. Using this method, we can quickly and accurately obtain the efficiency of microwave coupling into rocks, can guide practical engineering applications. © 2024 IEEE.

关键词： Microwave irradiation

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Enhancing Sola Forecasting Accuracy: A Fusion of Sky Images and Meteorological Data with Channel-Wise Attention

Enhancing Sola Forecasting Accuracy: A Fusion of Sky Images ...

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2024 IEEE IAS Industrial and Commercial Power System Asia, I and CPS Asia 2024

作者： Jonathan, Anto Leoba Cai, Dongsheng Bamisile, Olusola Nkou, Joseph Junior Nkou Agobah, Harriet Huang, Qi School of Nuclear and Automation Engineering Chengdu University of Technology Chengdu China

ISBN: (纸本)9798350352290

Accurate solar forecasting is crucial for efficient integration of solar power into the electricity grid. While sky image-based methods are introduced to overcome the low capability of numerical data to capture some features, enhancing forecasting accuracy remains an active area of research. In this paper we paper combine numerical data and sky images to improve the accuracy of solar forecasting. A new framework is proposed based on a convolutional neural network model with a channel-wise attention mechanism for 10 minutes ahead of solar forecasting using sky images and meteorological data. The model utilizes a series of convolutional blocks to extract spatial features from input sky images, followed by channel-wise attention layers to focus on the most salient features. Numerical data such as historical irradiance value, time, Tower Dry Bulb Temperature (TDBT), Total Cloud Cover (TCC), and Average Wind Speed (AWGS) are also incorporated through a separate extraction branch. The extracted sky image features and numerical representations are fused and fed into the model to forecast the global horizontal irradiance (GHI). An evaluation of real-world datasets demonstrates the effectiveness of the proposed method. The channel-wise attention mechanism helps improve model interpretability by highlighting influential image regions. Compared to benchmark persistence and CNN models, the proposed approach achieves 8% lower error in 10 minutes ahead of forecasts. An error analysis indicates its superior performance under abrupt cloud conditions that are difficult to predict. © 2024 IEEE.

关键词： Solar irradiance

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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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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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Hybrid Algorithm of Gradient Boosted Decision Tree and Multiple Linear Regression and Its Application on Decesion Prediction 3

Hybrid Algorithm of Gradient Boosted Decision Tree and Multi...

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3rd IEEE International Conference on Electronic Communications, Internet of Things and Big Data, ICEIB 2023

作者： Wen, Yingzi He, Xin Lv, Dawei Li, Fei College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu China College of Management Science Chengdu University of Technology Chengdu China College of Nuclear Technology and Automation Engineering Chengdu University of Technology China Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province Chengdu China

ISBN: (纸本)9798350333862

Gradient boosted decision tree is a supervised learning algorithm model constructed by improving tree structure, replacing residual with gradient and using the concept of entropy in informatics. GBDT produces classification bias due to the imbalance of the sample. Therefore, we propose a way to accelerate the output quality of a decision tree by combining linear regression and GBDT and preprocessing sample data through linear regression before training. In the experiment, the new algorithm is applied to the nonlinear classification decision. It is found that the regression coefficient of the apportion of independent directors is 0.034, the regression coefficient is 0.712, the regression coefficient for table size is 0.197, the regression coefficient for the size of the board of directors is -0.197, and the regression coefficient for the share of institutional investors is -0.018. The regression coefficient for the institutional investor share is -0.018. It is found that this algorithm effectively improves classification accuracy and has good practical value. © 2023 IEEE.

关键词： Multiple linear regression

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