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| 1 | 采用Fisher判别法对GIS中局部放电类型的识别(英文)显示文摘To monitor the condition of online power apparatus accurately and provide appropriate guidance on their maintenance,a fundamental ultra-high frequency(UHF) database of partial discharges corresponding to different types of defects is presented for the observation of insulation state of gas insulated switchgear(GIS).In order to imitate the defects in a GIS online,five types of typical partial discharge(PD) sources(i.e.floating metal,protrusion,bouncing particles,void in spacer,and particle on the surface of solid insulation) were designed and fabricated.A wideband UHF sensor and an amplifier were applied to obtain UHF signals.Based on the characteristics of the five different defects,nine meaningful parameters which were independent of the phase of the applied voltage were extracted from the PD samples and then discussed.In this paper,Fisher discriminant analysis(FDA),a pattern recognition algorithm,was applied for the purpose of classifying the defects.In this way,there was no need to set complicated parameters and kernel function,and the total discrimination accuracy of test samples was 97.6%.It indicates that based on the nine especial parameters,the typical defects in GIS can be identified exactly by means of FDA.Hence the analysis method could be possibly regarded as a universal classification method. | DING Dengwei GAO Wensheng LIU Weidong | 2013 | 高电压技术2013，39，4： | 9 |
| 2 | Analysis of Excitation Characteristics of Ultra High Frequency Electromagnetic Waves Induced by PD in GIS显示文摘The understanding of the excitation mechanism of ultra high frequency (UHF) electromagnetic waves (EW) is essential for ap- plying UHF method to partial discharge (PD) detection. Since the EW induced by PD in gas insulated switchgear (GIS) contains not only transverse electromagnetic (TEM) wave, but also high-order transverse electric (TE) and high-order transverse magnetic (TM) waves, we analyzed the proportions between the TEM wave and the high order waves, as well as the influence of the PD position on this proportion, using the finite different time domain (FDTD) method. According to the unique characteristics of the waves, they are separated only ap- proximately. It is found that the high-order mode is the main component, more than 70%, of the electric field around the enclosure of GIS, and that with the increasing distance between PD source and inner conductors, the low frequency ( below about 800 MHz) component of EW decreases, but the high frequency component (above 1 GHz) increases, meanwhile the proportion of high-order components in EW could reach 77% from 70%. It concluded that the closer the PD source to the enclosure is, the easier high order EW may be excited. | DING Dengwei GAO Wensheng YAO Senjing LIU Weidong HE Jiaxi | 2013 | 高电压技术2013，39，8： | 7 |
| 3 | Research on the typical partial discharge using the UHF detection method for GIS显示文摘 | Gao Wensheng Ding Dengwei Liu Weidong | | 0，，4： | 1 |
| 4 | In- vestigation of the evaluation of the PD severity and verifi- cation of the sensitivity of partial-discharge detection using the UHF method in GIS显示文摘 | GAO Wensheng DING Dengwei LIU Weidong | 2014 | IEEE Transactions on Power Delivery2014，29，1： | 1 |
| 5 | Prop-agation properties of high-frequency electromagnetic wavethrough typical in-field GIS structures 显示文摘 | GAO Wensheng DING Dengwei ZHAO Dongbo | 2014 | IEEE Transac-tions on Power Delivery2014，29，6： | 1 |
| 6 | Investigation of sensitivity of the ultra-high frequency partial-discharge detection technology for micro-crack in epoxy insulator in GIS显示文摘The ultra-high frequency(UHF)method has been widely used in a gas-insulated system(GIS)for partial-discharge detection,and many achievements have been realised.In addition,many studies based on artificial defects have been made to confirm its validity.Therefore,the UHF method is generally believed to be sufficiently effective for GIS monitoring.However,in practical application,the authors find that for some micro-crack discharge in GIS insulator,the UHF method has low sensitivity.To fully study the characteristics of the micro-crack discharge in the GIS insulator,an experiment is conducted in this study using an actual post insulator with a micro-crack defect.The current signal based on IEC 60270 standard and the radio-frequency electromagnetic signal is simultaneously measured for thorough analysis.The results show that some submillimetre crack defects may occur in the GIS insulator.Its discharge is mainly presented as glow discharge,and the discharge signal frequency usually cannot reach the UHF band;thus,it cannot be effectively detected by the UHF method.This study provides complementary information to the applicability of the UHF method and inspires further study of the GIS insulator and its monitoring technology. | Jiangrong Cheng Yang Xu Dengwei Ding Weidong Liu | 2020 | High Voltage2020，5，6： | 1 |
| 7 | Investigation of the evaluation of the PD severity and ver- ification of the sensitivity of partial-discharge detection using the UHF method in GIS显示文摘 | GAO Wensheng DING Dengwei LIU Weidong | 2014 | IEEE Transaction on Power Delivery2014，29，1： | 1 |
| 8 | Reform of Agricultural Land Transfer of Different Types of Farmers' Willingness显示文摘Since forty years of reform and opening up,China's rural landscape has undergone tremendous changes,and agricultural production manner is obviously improved,while farmers' living level is rose significantly.Rural land contracting and management right system plays a vital role in promoting rural economic and social development in China.In this paper,farmers under the background of the transfer of rural land contracting and management right are taken as research objects,and the difference of different types of farmers under the willingness of land transfer is analyzed.Finally,corresponding reform assumptions are proposed for transfer willingness of different types of farmers. | Hongbing ZHOU Ruiqi LI Dengwei DING | 2019 | Asian Agricultural Research2019，11，1： | 0 |
| 9 | Study on the Construction of Ecological Drainage Pipe with Critter Crossing Function显示文摘Critter passage can to a large extent ensure the safety of living things crossing the road and reduce the traffic mortality of living things arising from crossing the road. Outdoor drainage pipes can eliminate accumulated surface water,alleviate the drainage pressure of urban roads,and reduce the phenomenon of urban stagnant water. At present,there are many studies on the construction methods of drainage pipes,and there are also many studies on critter passage,but there is little research on the organic combination of critter passage and drainage pipes. Taking the drainage pipe as the research object,in accordance with the basic requirements of critter passage,this paper studies the construction methods of ecological drainage pipe with critter passage function,in order to solve the problem of single function of drainage pipe at present. It can provide a reference for related research in the future. | Zhenggen FAN Jiasen PAN Dengwei DING Jiang YU | 2019 | Asian Agricultural Research2019，11，12： | 0 |
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