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| 1 | Gas–solid interface charge characterisation techniques for HVDC GIS/GIL insulators显示文摘Surface charge accumulation on the spacers is one of the key issues restraining the development of HVDC GIS/GIL.The precise measurement of surface charge properties provides the basis for further study of the surface charge transport mechanism as well as the charge-induced flashover mechanism under DC voltage.In this study,the authors discuss their perspective on the current status,development needs and potential developing orientation of surface charge characterisation techniques.Different surface potential measurement methods and charge inversion algorithms are reviewed regarding the previous studies and future research needs.Drawbacks and outlooks of surface charge measurement techniques are also discussed with the background of laboratory experiment results and on-site measurements.It is hopefully that this study can serve as a useful guide reference for researchers within the same research field.More importantly,it is authors’hope that this study can inspire some novel ideas for readers into developing of more accurate and scientific interface charge characterisation techniques. | Lei Zhang Chuanjie Lin Chuanyang Li Simone Vincenzo Suraci Geng Chen Uwe Riechert Tohid Shahsavarian Masayuki Hikita Youping Tu Zhousheng Zhang Davide Fabiani Jinliang He | 2020 | High Voltage2020，5，2： | 4 |
| 2 | Surface Charging Phenomena on HVDC Spacers for Compressed SF_(6) Insulation and Charge Tailoring Strategies显示文摘Surface flashover of spacers is a key factor limiting the application of HVDC GIS/GIL,while the charge accumula-tion on the surface of the spacer could have a potential adverse effect on the surface flashover voltage.This paper discusses the laws regarding distribution patterns of surface charges and the related mechanisms.The field-dependent property is discussed in detail to comprehensively illustrate the charge transport mecha-nism and explain the research differences regarding different surface charge patterns obtained by previous researchers.In addition,the main surface charge control methods for epoxy resin are summarized and discussed.The potential research directions of charge control methods and key points in manufacturing of spacers used in HVDC GIS/GIL are also explored. | Chuanyang Li Yuan Xu Chuanjie Lin Geng Chen Youping Tu Yao Zhou Zhipeng Lei Tao Han Simone Vincenzo Suraci Jian Wang Weidong Liu M.Tariq Nazir Shun He Andrea Cavallini Giovanni Mazzanti Davide Fabiani Jinliang He | 2020 | CSEE Journal of Power and Energy Systems2020，6，1： | 3 |
| 3 | TSC characteristics of AC aged ZnO varistors显示文摘The AC aging characteristics and mechanism of ZnO varistors have been widely concerned for a long time.In this paper,accelerated aging test of ZnO varistors was carried out based on the 'ten degrees and a half' rule,power loss and thermally stimulated current(TSC) of samples were tested during each aging stage.The test results show that with the increasing of aging time,the power loss increases,the trapped charges increase and the trap level becomes deeper.In addition,the increase of power loss and the increase of trapped charge with the aging time have the same trend.A preliminary analysis shows that the migration of interstitial zinc ions will change the space charge distribution and decrease the Schottky barrier height to cause the change of the trap level. | TU YouPing WANG Qian HE Jie LI Xiao DING LiJian | 2013 | Chinese Science Bulletin2013，58，7： | 2 |
| 4 | Flashover Behavior of Cone-type Spacers with Inhomogeneous Temperature Distribution in SF_(6)/N_(2)-filled DC-GIL Under Lightning Impulse with DC Voltage Superimposed显示文摘Before designing DC gas insulated transmission lines(GIL),the insulation characteristics of spacers under a lightning impulse(LI)voltage with a superimposed DC voltage must be clarified.Many experiments have been performed to guide the development of the DC spacer.However,the impacts of thermal stresses on their insulation performance under combined voltage are always neglected,and little attention has been given to the insulation characteristics of spacers in an eco-friendly gas filled DC-GIL.To solve these problems,an experiment setup with the abilities to load the thermal field and the DC voltage with LI voltage superimposed on the cone-type spacer are built.After that,the insulation characteristics of spacers under the combined voltage of DC with lightning impulse at 0.1 MPa SF_(6)/N_(2) gas mixtures are investigated,under different thermal stress conditions.The experiment’s results indicate that:1)The flashover voltage of spacers under the same polarity superimposed voltages is slightly higher than that under LI alone.Conversely,the flashover voltage under reverse polarity superimposed voltages is lower than that under LI alone.2)The longer the duration of the foregoing DC voltage,the differences between the flashover voltage under superposed voltage and that under LI alone are larger.3)The combined flashover voltages are reduced under thermal stress.To ensure the insulation performance of newly designed DC spacers,the insulation test is suggested to be applied under thermal stress and combined voltage of the DC with lightning impulse,especially for superimposed reverse polarity. | Guoming Ma Hongyang Zhou Yuan Wang Hanchi Zhang Shijie Lu Youping Tu Jian Wang Chengrong Li | 2020 | CSEE Journal of Power and Energy Systems2020，6，2： | 2 |
| 5 | Feasibility of C_(3)F_(7)CN/CO_(2)gas mixtures in high-voltage DC GIL:a review on recent advances显示文摘With the rise of renewable energy resources,especially offshore wind power plant,the DC transmission concept has attracted more and more attention.The selection of eco-friendly insulating gas,as most critical insulating part of gas-insulated equipment is top priority for developing highly reliable system.Moreover,it is acknowledged that eco-friendly C_(3)F_(7)CN/CO_(2) gas mixtures have become a potential alternative to SF_(6) gas due to its excellent performance.This study reviews the basic physical properties of C_(3)F_(7)CN gas/gas mixtures and insulation properties including the gas gap breakdown and surface flashover performance at DC,as well as lightning impulse voltage.Investigation about the gas stability is presented,including the compatibility of gas with solid materials in gas-insulated transmission line(GIL),and the decomposition characteristics under long-term electrical and thermal stresses.The important progress on the charge accumulation characteristics of gas-solid interface in the novel gas environment under DC voltage stress is analysed.Finally,the key issues that need to be paid attention to and further followed through regarding the application of this novel gas in GIL are summarised and put forward.This study hopefully can provide a complete reference for the development of eco-friendly DC gas insulation equipment with C_(3)F_(7)CN/CO_(2) gas mixtures. | Youping Tu Geng Chen Cong Wang Yuming Shao Yujing Tong Chuanyang Li Guoming Ma Tohid Shahsavarian | 2020 | High Voltage2020，5，4： | 2 |
| 6 | Relationship between space charge and nonlinear characteristics of ZnO varistor显示文摘In order to reveal the conduction mechanism of ZnO varistor, the pulsed electroacoustic (PEA) measurement is employed to investigate the space charge distribution characteristics of ZnO varistors under different current densities in this paper. Experimental results show that the relationship between the space charge and the current density is consistent with the voltage-current characteristics, and can reflect the nonlinear characteristics of ZnO varistor. The space charge increases linearly with the increase of the electric field strength and the current density in the small current region, this reflects the decrease of the surface states of the grain boundary and changes of the Schottky barrier. There exists a transition region between the small current and middle current regions, where the current is composed of the current by the emission of thermally activated electrons and the tunneling current. In the middle current region, the space charge will decrease as the current increases, and will disappear with the depletion layer decreasing to zero. | WANG Qian TU YouPing DING LiJian JU ZeLi | 2011 | Science China(Technological Sciences)2011，54，7： | 2 |
| 7 | Laboratory investigation of impulse characteristics of transmission tower grounding devices显示文摘 | He Jinliang Zeng Rong Tu Youping | 2003 | IEEE Transactions on Power Delivery2003，18，3： | 1 |
| 8 | Numeral analysis model for shielding failure of transmission line under lightning stroke显示文摘 | He Jingiang Tu Youping Zeng Rong | 2005 | IEEE Transaction on Power Delivery2005，20，2： | 1 |
| 9 | Labo- ratory investigation of impulse characteristics of transmi~ion tower grounding devices 显示文摘 | He Jinliang Zeng Rong Tu Youping | 2003 | IEEE Transaction on Power Delivery2003，18，3： | 1 |
| 10 | Numeral analysis model for shielding failure of transmission line under lightning stroke显示文摘 | He Jinliang Tu Youping Zeng Rong | 2005 | IEEE Transactions on Power Delivery2005，20，2： | 1 |
| 11 | Numeral analysis model for shielding failure of transmission line under lightning stroke显示文摘 | He Jinliang Tu Youping Zeng Rong | 2005 | IEEE Transactions on Power Delivery2005，20，2： | 1 |
| 12 | Laboratory investigation of impulse characteristics of transmission tower grounding devices显示文摘 | Jinliang He Rong Zeng Youping Tu | 2003 | IEEE Transaction on Power Delivery2003，18，3： | 1 |
| 13 | Numeral analysis model for shielding failure of transmission line under lightning stroke显示文摘 | He Jinliang Tu Youping Zeng Rong | 2005 | IEEE Transactions on Power Delivery2005，20，2： | 1 |
| 14 | Lightning Impulse Performances of Grounding Devices Covered With Low - Resistivity Materials 显示文摘 | Youping Tu Jingliang He RongZeng | 2006 | IEEE Tans on Power Delivery2006，21，3： | 1 |
| 15 | Study on the influencing factors to reduce the recovery time of superconducting tapes and coils for the DC superconducting fault current limiter applications显示文摘Superconducting fault current limiters(SFCLs)are important in improving the stability of electrical power systems.However,the existing resistive-type DC SFCL has a long re-covery time,which cannot meet the requirements of power system auto-reclosure.Thus,it is necessary to investigate the methods of reducing recovery time of SFCLs.In the simulations on superconducting tapes,there is a lack of investigation about the effects of design factors of superconducting tapes and coils such as material,thickness,coil radius,coil winding method on recovery characteristics.The objective of this study is to obtain the effects of material and geometric properties of superconducting tapes and coils on recovery characteristics and obtain methods to reduce the recovery time.The recovery times under different conducting currents are also compared by simulations and exper-iments to verify simulation accuracy.The maximum error is below 40%and most of the cases have an error below 10%.Besides,by increasing tape thickness,the recovery time can be reduced by 22%.Tape materials and coil winding methods can be designed ac-cording to the auto-reclosure and current-limiting requirements of the power systems.The research provided directions for the design of superconducting tape and super-conducting coil for resistive-type DC SFCLs. | Bin Xiang Wenqing Wang Hongxu Li Lei Gao Zhiyuan Liu Yingsan Geng Jianhua Wang Youping Tu | 2022 | High Voltage2022，7，3： | 1 |
| 16 | Numerical Analysis Model for Shielding Failure of Transmission Line Under Lightning Stroke显示文摘 | HE Jinliang TU Youping ZENG Rong | | 0，，02： | 1 |
| 17 | Lightning impulse performances of grounding devices covered with low resistivity materials显示文摘 | Tu Youping He Jinliang Zeng Rong | 2006 | IEEE Transactions On Power Delivery2006，21，3： | 1 |
| 18 | Laboratory investigation of impulse characteristics of transmission tower grounding devices 显示文摘 | He Jinliang Zeng Rong Tu Youping | 2003 | IEEE Transactions on Power Delivery2003，18，3： | 1 |
| 19 | Laboratory investigation of impulse characteristics of transmission tower grounding devices显示文摘 | He Jinliang Zeng Rong Tu Youping | 2003 | IEEE Transactions on Power Delivery2003，18，3： | 1 |
| 20 | Lightning impulse performances of grounding devices covered with low resistivity materials 显示文摘 | Tu Youping He Jinliang Zeng Rong | 2006 | IEEE Transactions on Power Delivery2006，21，3： | 1 |
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