• Complex
  • Title
  • Author
  • Keyword
  • Abstract
  • Scholars
Search
High Impact Results & Cited Count Trend for Year Keyword Cloud and Partner Relationship

Query:

学者姓名:张冠军

Refining:

Source

Submit Unfold

Co-Author

Submit Unfold

Language

Submit

Clean All

Export Sort by:
Default
  • Default
  • Title
  • Year
  • WOS Cited Count
  • Impact factor
  • Ascending
  • Descending
< Page ,Total 20 >
Arrival time estimation methodology for partial discharge acoustic signals in power transformers based on a double-threshold technique SCIE
期刊论文 | 2019 , 30 (2) | MEASUREMENT SCIENCE AND TECHNOLOGY
Abstract&Keyword Cite

Abstract :

Much attention has been paid to different localisation algorithms to locate partial discharge (PD) sources in power transformers using the acoustic emission (AE) technique. Due to total reflection, AE sensors cannot always detect the signal of a direct wave. As a result, localisation algorithms based on an indirect wave can be more accurate. But little research has addressed arrival time (AT) methods of indirect PD signals. In this paper, a double-threshold (DT) method is introduced, and its improvement based on short-time energy and a zero-crossing rate is described. Because an indirect wave arrives earlier and has lower energy than a direct wave, current AT methods, such as the energy criterion, cross-correlation, and linear prediction residual methods, cannot determine its AT. However, the proposed DT method can determine the AT precisely. Moreover, a localisation experiment was conducted on a 35 kV transformer, and localisation results were calculated employing various AT methods and different localisation algorithms, such as the Chan, genetic, imperial competition, and improved-propagation-route-search algorithms. Characteristics of the proposed AT methods were compared and analysed to show their feasibility and accuracy.

Keyword :

partial discharges time of arrival estimation acoustic emission localisation power transformers

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Wang, Yan-Bo , Fan, Yu-Hang , Qin, Shao-Rui et al. Arrival time estimation methodology for partial discharge acoustic signals in power transformers based on a double-threshold technique [J]. | MEASUREMENT SCIENCE AND TECHNOLOGY , 2019 , 30 (2) .
MLA Wang, Yan-Bo et al. "Arrival time estimation methodology for partial discharge acoustic signals in power transformers based on a double-threshold technique" . | MEASUREMENT SCIENCE AND TECHNOLOGY 30 . 2 (2019) .
APA Wang, Yan-Bo , Fan, Yu-Hang , Qin, Shao-Rui , Chang, Ding-Ge , Shao, Xian-Jun , Mu, Hai-Bao et al. Arrival time estimation methodology for partial discharge acoustic signals in power transformers based on a double-threshold technique . | MEASUREMENT SCIENCE AND TECHNOLOGY , 2019 , 30 (2) .
Export to NoteExpress RIS BibTex
Discharge characteristics of argon atmosphere dielectric barrier with different p d values EI Scopus
会议论文 | 2018 , 2018-May , 856-862 | 12th International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2018
Abstract&Keyword Cite

Abstract :

The electrical and optical characteristics of DBD are different from those of bare electrodes, while the Paschen curve reflects the relationship between breakdown voltage and gas pressure and gap distance. The specific characteristics in DBD need to be differentiated. The electrical characteristics of DBD are closely related to the discharge mode. The mode of DBD discharge can be divided into filamentous discharge and uniform discharge. The plasma contains a large number of excited particles, which radiate at low energy level. After being recorded by ICCD camera, the emission spectrum of plasma can be obtained. By analyzing the intensity and location of the spectrum, we can get a lot of information inside the plasma, such as electron excitation temperature, excited particle species, relative number density and the width of cathode falling zone, etc. The spectral diagnostic method used in this experiment is a non-contact plasma diagnosis method. First, based on the experimental platform of plasma, a DBD device for parallel plate electrode is set up. The medium frequency power supply is 22.0kHz, the working gas is argon, through the observation of the initial discharge voltage, discharge current, ICCD image, study the Paschen curves' characteristic of Ar-DBD, to investigate the mechanism of discharge, volt ampere characteristics and discharge mode evolution characteristics of argon gas, familiar with DBD. Then, through the ICCD camera emission spectra and nanosecond discharge dynamics image shooting, evolution of its time and space, including types, the discharge process of energetic particles in the reaction particle concentration, the cathode falls region width and electron excitation temperature relationship. © 2018 IEEE.

Keyword :

Dielectric barrier discharges Electrical characteristic Electron excitation temperature Emission spectrums Evolution characteristics Paschen curves Volt-ampere characteristics Voltage and current characteristics

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Niu, Chao-Bin , Qin, Shaorui , Zhang, Xing et al. Discharge characteristics of argon atmosphere dielectric barrier with different p d values [C] . 2018 : 856-862 .
MLA Niu, Chao-Bin et al. "Discharge characteristics of argon atmosphere dielectric barrier with different p d values" . (2018) : 856-862 .
APA Niu, Chao-Bin , Qin, Shaorui , Zhang, Xing , Zhao, Hao-Xiang , Liu, Xiaowei , Mu, Hai-Bao et al. Discharge characteristics of argon atmosphere dielectric barrier with different p d values . (2018) : 856-862 .
Export to NoteExpress RIS BibTex
An improved model of hot-spot temperature for oil-immersed transformers based on multi-parameter fusion EI Scopus
会议论文 | 2018 , 2018-May , 756-759 | 12th International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2018
Abstract&Keyword Cite

Abstract :

For large power transformers, the hot-spot temperature (HST) of windings has a significant effect on its thermal aging rate and operation reliability. However, the computation of HST is a sophisticated engineering problem all the time because of varied external environment, multi-heat source and the sensitivity of heat transfer coefficients. This paper proposes an improved model of HST for oil-immersed transformers based on the heat transfer theory, which could analyze the heat dissipation process of transformers. In order to enhance the applicability of this model, the ambient wind velocity, which affects the cooling efficiency and the form of thermal convection between the tank walls and ambience of transformer, is regarded as a vital factor leading into the calculation formula of thermal resistance. On the other hand, the sunshine radiation power absorbed by transformer is also introduced as one of the heat sources. Besides, the changes of load loss and oil viscosity with temperature is considered to guarantee the accuracy of this model, too. Lastly, the proposed model has been verified by utilizing experimental data, which was collected by a 220kV transformer operating under different load conditions. Compared with the measured values of HST and the calculated results by the IEC guide, it is found that this method can improve the calculation accuracy of HST by 2.64% and has more real-time performance and faster dynamic response capacity. © 2018 IEEE.

Keyword :

Engineering problems External environments Hotspot temperature Large power transformers Oil immersed transformers Operation reliability Real time performance Wind velocities

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Liang, Yu , Liu, Ning , Chen, Qin-Zhu et al. An improved model of hot-spot temperature for oil-immersed transformers based on multi-parameter fusion [C] . 2018 : 756-759 .
MLA Liang, Yu et al. "An improved model of hot-spot temperature for oil-immersed transformers based on multi-parameter fusion" . (2018) : 756-759 .
APA Liang, Yu , Liu, Ning , Chen, Qin-Zhu , Li, Yuan , Xu, Yao-Yu , Zhang, Guan-Jun . An improved model of hot-spot temperature for oil-immersed transformers based on multi-parameter fusion . (2018) : 756-759 .
Export to NoteExpress RIS BibTex
Dissolved gas analysis of transformer oil based on Deep Belief Networks EI Scopus
会议论文 | 2018 , 2018-May , 825-828 | 12th International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2018
Abstract&Keyword Cite

Abstract :

Dissolved gas analysis (DGA) has been proven an effective method to diagnose the internal fault of transformers for decades. This paper proposes an approach of DGA based on Deep Belief Networks (DBN) which belongs to deep-learning theory. With composed of Restricted Boltzmann Machines (RBMs), DBN can built the mapping relationship between the characteristic gas and the fault types automatically to achieve the accurate diagnosis, namely Pattern Recognition (PR). In this paper, DGA data is divided into three categories, called training data, fine-tuning data and test data. Training data is used for unsupervised-learning to initialize parameters of RBMs in DBN, and fine-tuning data is for supervised-learning with fault modes to optimize parameters. Finally, the test data is used to calculate the recognition rate of transformer fault diagnosis. It comes to conclusion that DBN model proposed shows a promising results of transformer fault diagnosis with high accuracy of 84.87% Compared with Back Propagation Neural Network (BPNN) method, DBN model not only achieves a high recognition rata of transformer fault, but also have strong generalization ability under big data, which could provide a powerful tool for the internal fault diagnosis of transformers. © 2018 IEEE.

Keyword :

Back-propagation neural networks Deep belief network (DBN) Deep belief networks Dissolved gas analyses (DGA) Dissolved gas analysis Generalization ability Restricted boltzmann machine Transformer fault diagnosis

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Liang, Yu , Xu, Yao-Yu , Wan, Xin-Shu et al. Dissolved gas analysis of transformer oil based on Deep Belief Networks [C] . 2018 : 825-828 .
MLA Liang, Yu et al. "Dissolved gas analysis of transformer oil based on Deep Belief Networks" . (2018) : 825-828 .
APA Liang, Yu , Xu, Yao-Yu , Wan, Xin-Shu , Li, Yuan , Liu, Ning , Zhang, Guan-Jun . Dissolved gas analysis of transformer oil based on Deep Belief Networks . (2018) : 825-828 .
Export to NoteExpress RIS BibTex
Two dimensional modelling of streamer inception and propagation in transformer oil EI Scopus
会议论文 | 2018 , 2018-May , 637-640 | 12th International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2018
Abstract&Keyword Cite

Abstract :

The characteristics of the initiation and the propagation of streamer in the transformer oil are investigated through a two-dimensional axially symmetric needle-to-plane electrode model. The simulation model is based on the approximation of hydrodynamic drift-diffusion, in which transformer oil is treated as a kind of dense fluid and the fluid physical processes of the streamer are dominated via three drift-diffusion equations regarding to positive ions, negative ions and electrons coupled with Poisson equation. In numerical calculations, the finite element method based on advanced computing software is used in solving the model. Through the simulation, the distribution of electric potential, space charge density, electric field and particles of electrons, positive ions and negative ions can be obtained. By means of the above parameters, the streamer current, streamer propagation speed, and the threshold of inception voltage can be calculated. The streamers under different of applied voltage amplitude, polarity, and the shape of electrode are modeled and discussed. The amplitude influences the speed of the streamer, and the shape of electrode has a comprehensive impact. Also, the difference between positive and negative streamer is presented. © 2018 IEEE.

Keyword :

Amplitude influence Driftdiffusion equations Liquid insulation Liquid models Numerical calculation Streamer Streamer propagation Two-dimensional modelling

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Tang, Feng , Li, Ya-Hong , Wen, Jia-Ye et al. Two dimensional modelling of streamer inception and propagation in transformer oil [C] . 2018 : 637-640 .
MLA Tang, Feng et al. "Two dimensional modelling of streamer inception and propagation in transformer oil" . (2018) : 637-640 .
APA Tang, Feng , Li, Ya-Hong , Wen, Jia-Ye , Li, Yuan , Zhang, Guan-Jun . Two dimensional modelling of streamer inception and propagation in transformer oil . (2018) : 637-640 .
Export to NoteExpress RIS BibTex
Large volume streamer discharges in water with different impulse volt. parameters EI Scopus
会议论文 | 2018 , 2018-May , 797-800 | 12th International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2018
Abstract&Keyword Cite

Abstract :

Plasma discharge has great many advantages in water treatment and the relevant industrial applications require large volume discharge in water to increase the efficiency. In the paper, the optical images of large volume discharges in water with sphere-to-cylinder and rod-to-cylinder electrode were achieved under different impulse voltage parameters such as amplitude, polarity and pulse width. Additionally, by means of the evolution images of streamer propagation in water, a stepwise trend during the wave front time of streamer propagation is obtained, which is explained by the interactions with streamer resistance, charge distribution and discharge conditions change. © 2018 IEEE.

Keyword :

Cylinder electrodes Discharge conditions Impulse voltage Large volume discharge Plasma discharge Pulsed discharge Streamer discharges Streamer propagation

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Wen, Jia-Ye , Li, Yuan , Ren, Shuang-Zan et al. Large volume streamer discharges in water with different impulse volt. parameters [C] . 2018 : 797-800 .
MLA Wen, Jia-Ye et al. "Large volume streamer discharges in water with different impulse volt. parameters" . (2018) : 797-800 .
APA Wen, Jia-Ye , Li, Yuan , Ren, Shuang-Zan , Zhang, Guan-Jun . Large volume streamer discharges in water with different impulse volt. parameters . (2018) : 797-800 .
Export to NoteExpress RIS BibTex
Large volume streamer discharges in water with different impulse voltage parameters EI Scopus
会议论文 | 2018 , 2018-May , 734-737 | 12th International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2018
Abstract&Keyword Cite

Abstract :

Plasma discharge has great many advantages in water treatment and the relevant industrial applications require large volume discharge in water to increase the efficiency. In the paper, the optical images of large volume discharges in water with sphere-to-cylinder and rod-to-cylinder electrode were achieved under different impulse voltage parameters such as amplitude, polarity and pulse width. Additionally, by means of the evolution images of streamer propagation in water, a stepwise trend during the wave front time of streamer propagation is obtained, which is explained by the interactions with streamer resistance, charge distribution and discharge conditions change. © 2018 IEEE.

Keyword :

Cylinder electrodes Discharge conditions Impulse voltage Large volume discharge Plasma discharge Pulsed discharge Streamer discharges Streamer propagation

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Wen, Jia-Ye , Li, Yuan , Ren, Shuang-Zan et al. Large volume streamer discharges in water with different impulse voltage parameters [C] . 2018 : 734-737 .
MLA Wen, Jia-Ye et al. "Large volume streamer discharges in water with different impulse voltage parameters" . (2018) : 734-737 .
APA Wen, Jia-Ye , Li, Yuan , Ren, Shuang-Zan , Zhang, Guan-Jun . Large volume streamer discharges in water with different impulse voltage parameters . (2018) : 734-737 .
Export to NoteExpress RIS BibTex
Analysis of Morphology and Electrical Insulation of 3D Printing Parts CPCI-S
会议论文 | 2018 | IEEE International Conference on High Voltage Engineering and Application (ICHVE)
Abstract&Keyword Cite

Abstract :

3D printing technology is a rapid prototyping technology which is in the process of fast development. It has the advantages of no mold requirement, high precision and high shape controllability. To apply 3D printing in the field of electric engineering, it is necessary to understand the insulating properties and the microstructure of the printing parts. In this paper, several commonly used 3D printing techniques are taken into consideration, including stereolithography apparatus (SLA), fused deposition modeling (FDM), and selective laser sintering (SLS). Representative materials for these 3D printing process are selected, i.e. High Temp resin for SLA, PLA and ABS for FDM and PA2200 for SLS. The surface and interior morphology of the 3D printing parts were characterized, then the dielectric parameters and electrical withstanding ability of the four materials were tested. Finally, a comprehensive evaluation was made on whether the 3D printing techniques were suitable for electrical insulation. The test results showed that, SLA process parts have the best morphology feature, and there are defects in FDM and SLS process parts. The dielectric parameters of the four materials meet the requirements as insulating materials, and the breakdown strength are all above 30 kV/mm. It can be said that the development of 3D printing technology in the field of electrical engineering has high feasibility, and different processes and materials have their own suitable applications.

Keyword :

3D Printing Electrical Withstanding Ability Morphological Features Dielectric Properties

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Li, Xiao-Ran , Guo, Jia , Li, Wen-Dong et al. Analysis of Morphology and Electrical Insulation of 3D Printing Parts [C] . 2018 .
MLA Li, Xiao-Ran et al. "Analysis of Morphology and Electrical Insulation of 3D Printing Parts" . (2018) .
APA Li, Xiao-Ran , Guo, Jia , Li, Wen-Dong , Zhang, Li-Yuan , Wang, Chao , Guo, Bao-Hong et al. Analysis of Morphology and Electrical Insulation of 3D Printing Parts . (2018) .
Export to NoteExpress RIS BibTex
Localization Method for Multiple Partial Discharge Sources in Air-insulated Substation by Using Plane Intersection Method EI
期刊论文 | 2018 , 44 (9) , 2970-2976 | Gaodianya Jishu/High Voltage Engineering
Abstract&Keyword Cite

Abstract :

Recently, the ultra-high-frequency-based antenna array has been applied to partial discharge (PD) detection and localization in air-insulated substations (AIS). The range of PD source is generally estimated with high inaccuracy in most of the related instruments, and a localization algorithm which is applicable to the cases of multiple sources is not developed yet. We put forward a plane intersection method to localize multiple PD sources which may occur simultaneously in AIS. The time difference of arrival (TDOA) between antennas is estimated with the cross-correlation (CC) method, in which the CC function is interpolated with minor time interval to improve the TDOA accuracy when an acquisition instrument with low sampling rate is adopted. Thereafter, the time difference equations are solved with the plane intersection method, and the final localization results are determined as the one with highest probability among numerous signals. In the case of multiple PD sources, the K Means clustering algorithm is applied to TDOA vector of antenna array to separate UHF signals. A PD detection and localization experimental system is developed and used to test the accuracy of the proposed algorithm. The results indicate that, for diamond array with size of 4 m×2 m and PD sources within range of 10 m and 45° to normal line of antenna pair with distance of 4 m, the localization error is less than 1 m in all cases and 20 cm in most cases. Moreover, the localization accuracy for multiple PD sources are close to that of one source. © 2018, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

Keyword :

Intersection method K-Means clustering algorithm Localization Localization algorithm Partial discharge detection Partial discharge sources Signal separation Ultra high frequency method

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Zhu, Mingxiao , Liu, Qing , Wang, Yanbo et al. Localization Method for Multiple Partial Discharge Sources in Air-insulated Substation by Using Plane Intersection Method [J]. | Gaodianya Jishu/High Voltage Engineering , 2018 , 44 (9) : 2970-2976 .
MLA Zhu, Mingxiao et al. "Localization Method for Multiple Partial Discharge Sources in Air-insulated Substation by Using Plane Intersection Method" . | Gaodianya Jishu/High Voltage Engineering 44 . 9 (2018) : 2970-2976 .
APA Zhu, Mingxiao , Liu, Qing , Wang, Yanbo , Deng, Junbo , Zhang, Guanjun , Guo, Anxiang . Localization Method for Multiple Partial Discharge Sources in Air-insulated Substation by Using Plane Intersection Method . | Gaodianya Jishu/High Voltage Engineering , 2018 , 44 (9) , 2970-2976 .
Export to NoteExpress RIS BibTex
Simulation and Experimental Research on S Parameter Characteristics of Partial Discharge UHF Signals in GIS EI Scopus CSCD PKU
期刊论文 | 2018 , 44 (1) , 234-240 | Gaodianya Jishu/High Voltage Engineering
SCOPUS Cited Count: 2
Abstract&Keyword Cite

Abstract :

Study of EM wave propagation characteristics in GIS is meaningful to analyze and localize partial discharge sources. First, based on the finite integration technique, the simulation of S parameters was performed to analyze changes of S parameters with the number of basin-type insulators. Meanwhile, a 252 kV GIS experiment platform was established, where signals from different positions could be obtained by inner sensors. Compared with S parameters calculated from experiments, the simulation results, which showed a good consistency both in waveform and amplitude, were proven to be reasonable. Moreover, a vector network analyzer was used to measure S parameters in different structures of GIS, and simulation models were refined and changed. The results of vector network analyzer were compared with those of simulation which had a good consistency and proved the rationalisation of the simulation conclusion. The results show that the attenuation influence of one insulator can be up to -3 dB, which is in proportion to the number of insulators. © 2018, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

Keyword :

Basin type insulators Different structure Experiment platforms Experimental research Finite integration technique Partial discharge sources Vector network analyzers Vector networks

Cite:

Copy from the list or Export to your reference management。

GB/T 7714 Wang, Yanbo , Zhu, Mingxiao , Shao, Xianjun et al. Simulation and Experimental Research on S Parameter Characteristics of Partial Discharge UHF Signals in GIS [J]. | Gaodianya Jishu/High Voltage Engineering , 2018 , 44 (1) : 234-240 .
MLA Wang, Yanbo et al. "Simulation and Experimental Research on S Parameter Characteristics of Partial Discharge UHF Signals in GIS" . | Gaodianya Jishu/High Voltage Engineering 44 . 1 (2018) : 234-240 .
APA Wang, Yanbo , Zhu, Mingxiao , Shao, Xianjun , Qian, Ping , Deng, Junbo , Zhang, Guanjun . Simulation and Experimental Research on S Parameter Characteristics of Partial Discharge UHF Signals in GIS . | Gaodianya Jishu/High Voltage Engineering , 2018 , 44 (1) , 234-240 .
Export to NoteExpress RIS BibTex
10| 20| 50 per page
< Page ,Total 20 >

Export

Results:

Selected

to

Format:
FAQ| About| Online/Total:2552/65149477
Address:XI'AN JIAOTONG UNIVERSITY LIBRARY(No.28, Xianning West Road, Xi'an, Shaanxi Post Code:710049) Contact Us:029-82667865
Copyright:XI'AN JIAOTONG UNIVERSITY LIBRARY Technical Support:Beijing Aegean Software Co., Ltd.