Dr
Tao Xun
(College of Opto-electric Science and Engineering, National University of Defense Technology, Changsha 410073, China)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
Research on the surface flashover of the vacuum interface under pulsed voltage is significant for the design and operation of pulsed power devices. The interface problem is difficult because the electrical, mechanical and vacuum issues that must be satisfied simultaneously. In this paper, a coaxial high-voltage vacuum interface based on ceramic-metal welding has been designed and tested with a...
Mr
Guan-Jun Zhang
(State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
For dielectric-vacuum compound insulation systems, the discharges usually occur across the insulator surface with an onset voltage much lower than the breakdown voltage for vacuum gap of the same length. It is no wonder that the surface charge accumulated on the insulator plays an important role in the flashover process in vacuum, especially under DC voltage. In this paper, the off-line...
Prof.
Abderrahmane Beroual
(Ecole Centrale de Lyon, University of Lyon, Ampere Lab)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
Due to excellent and outstanding properties in both electrical insulation and current interruption performances, sulfur hexafluoride gas, SF6, is the most used gas in high voltage power equipment such as circuit breakers (GCB), switchgears (GIS), and transmission lines (GIL) since 1960s. ; SF6 is one of the best insulators gas known to date. However, by its excessive size and life span...
Manuel Aldan
(UC Berkeley)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
The purpose of this study is to characterize and order various contributions to breakdown, starting with single-surface multipactor in DC. 2D particle-in-cell (PIC) simulations will be presented for DC breakdown from vacuum through low pressure in dielectric-loaded, high-voltage systems. Simulations follow developments in [1] with a PIC model accounting for discretization errors. Models are...
Prof.
Junhao Li
(Xi'an Jiaotong University)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
Gas insulated switchgear (GIS) has been widely used in power grid for its high reliability and small size. GIS is assembled in field considering the transportation. The AC withstand voltage testing will be taken in filed to verify the insulation condition of GIS. But only the AC withstand testing is not enough to inspect the all defects inside GIS. Impulse voltage testing is required in field....
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
SF6 is widely used in high-voltage equipment due to its excellent insulation ability. However, when the moisture content in SF6 exceeds a certain value, its insulation could be damaged, threatening the normal operation of high-voltage equipment. Therefore it's of great importance to establish proper control standards on moisture content in SF6.
In this paper, the influence of moisture...
Dr
Qin Hu
(Central Michigan University)
06/07/2016, 13:30
Biological, Medical, and Environmental Applications of Power Modulators
Oral Presentation
Applications of electric pulses to create nanopores at the membranes of biological cells can modulate the conductivity and permeabilization in a controlled manner. Applications of such membrane poration lies in the field of biomedical engineering, drug/gene delivery, cell fusion, and electrochemotherapy for cancer treatment. In principle, various different electrode shapes and geometries can...
Mr
Can Guo
(Xi'an Jiaotong University)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
In recent years, SF6/N2 gas mixtures especially with low SF6 mixing ratio was getting used as insulating medium in gas-insulated equipment for replacing pure SF6 which causes greenhouse effect. For the application of SF6/N2 gas mixtures in power equipment such as GIL, the breakdown characteristics of SF6/N2 gas mixtures in different electric field non-uniformity under lightning impulse were...
Mr
Kai LIU
(Xi’an Jiaotong University)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
The detection of gas decomposition products is an effective method to diagnose the partial discharge in SF6 insulated electric power equipment for its anti-interference ability and high sensitivity. However, there inevitably exists trace level of water in the SF6 insulated equipment. In order to study the influence of moisture under low volume fraction (<1350×10-6) on discharge and...
Can Guo
(Xi'an Jiaotong University), Mr
Tao Wen
(State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
Very fast transient overvoltages(VFTOs) generated during the routine operations of disconnector switch in GIS make great threat to the insulation of power equipment such as GIS. So far, the research results of the insulation characteristics of GIS under VFTO have big dispersion and poor comparability for the waveform parameters of VFTO have not been standardized. A generating system of...
Dr
Ramachandra Balaiah
(P.E.S. College of Engineering),
sanjeev kumar
(Sri Siddhartha Institute of Technology)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
Corrosion of copper conductors in transformers due to presence of mercaptan sulfur in oil is a problem affecting the paper-oil insulations, potentially leading to failure of transformers. The mercaptan sulfur reacts with the copper conductor and forms copper sulfide on the surface. Copper sulfide also migrates from conductor surface to outer layers of paper and from there it is carried to...
Bert van Heesch
(TUe)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
Most modern equipment in power substations applies SF6 as the working gas for insulation and arc extinction. SF6, sulphur hexafluoride, has powerful arc extinction properties and excellent insulation properties.
However, SF6 is a very strong greenhouse gas when leaked and it leaves extremely toxic oxides after operational lifetime in circuit breakers.
Researchers and companies are gradually...
Prof.
Abderrahmane Beroual
(Ecole Centrale de Lyon, University of Lyon, Ampere Lab)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
The solid/fluid (gas or liquid) insulating systems are widely used in high voltage equipment (bushings, insulators, switchgears, gas insulating lines, gas circuit breakers, high voltage power transformers, power capacitors …) where they are exposed to different stresses and particularly to discharges phenomena that can develop within the body of insulator or at the solid/fluid interface...
qizheng ye
(Huazhong University of Science and Technolog)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
In order to avoid the random of the discharge paths on the polluted insulators, we make use of the capillary to form the arc in the confined space. In the capillary, the salt grains and kaolin powder are used to replace the composition of the polluted layer respectively. The voltage and the current waves of the arcs are recorded, and the photographs are presented. The experimental results...
Mr
Dongdong Zhang
(Institute of Electrical Engineering, Chinese Academy of Sciences)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
Surface characteristics of Insulator effect its surface flashover performance obviously, appropriate surface treatment can increase the surface flashover voltage. Ion implantation technology is an effective surface modification tool, it can change the roughness, resistivity and adsorbability on the insulator surface. Polytetrafluoroethylene ( PTFE ) was modified by carbon ion and nitrogen...
Dr
Emel Onal
(Istanbul Technical University)
06/07/2016, 13:30
Dielectrics, Insulation, and Breakdown
Poster Presentation
In this study,time to breakdown and breakdown voltage for GIS (Gas Insulation Systems) are performed.The assessment ofthe insulation parameters such as breakdown voltage and time-tobreakdown is always done by rapid and endurance testing.At non-uniform electrode system, pressure and gas rates like SF6, N2, CO2 are used as various parameters.It is shown how the time-to-breakdown is influenced by...
