Please wait, while we are loading the content...
| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Krile, J.T. Neuber, A.A. Krompholz, H.G. |
| Copyright Year | 2007 |
| Description | Author affiliation: Texas Tech Univ., Lubbock (Krile, J.T.; Neuber, A.A.; Krompholz, H.G.) |
| Abstract | Summary form only given. Dielectric surface flashover in an atmospheric environment is an important consideration in the design of insulating support structures for pulsed, high voltage applications. Only recently, increased effort has been invested in characterizing and quantifying the physical processes involved in surface flashover occurring at atmospheric conditions. We have previously shown qualitatively that UV illumination of the surface, either externally or possibly generated by the developing discharge itself, affects the distance between flashover path and surface for small gaps with a nonnegligible field component normal to surface. By studying the effects of UV illumination on the flashover behavior, information was gained about the underlying mechanisms of dielectric surface flashover. Utilizing a solid-state UV source with a much faster turn-off time than gas tubes along with the flashover testing apparatus' generally high temporal resolution enabled us to measure applied UV pulse, voltage, current and flashover self luminosity with high temporal precision. For all experiments, the dielectric flashover sample is placed inside an environmentally controlled chamber with a constant gas flow. Using advanced field simulations the electrode/dielectric geometry was designed to produce an optimized field shape for the testing of surface effects. Besides reducing the flashover delay times by up to 50%, the application of a 1 $mW/cm^{2},$ 20 mus UV pulse, prior to the voltage pulse, forces the flashover discharge in nitrogen to "hug" the surface rather than develop a few millimeters away from the surface along the field lines. Increasing the time delay between UV and voltage pulse application, it was revealed that the impact of the UV pulse on the flashover path becomes weaker with a time constant, tau, of ~ 3.1 mus. That is, after roughly 10 mus (3 times tau), the flashover path develops as without any UV application at all. In addition to experimental data of dielectric surface flashover with varying degrees of UV illumination, we present a simple model that describes the observed behavior as well as a more advanced analysis utilizing a Monte Carlo type code for the electron collision dynamics. |
| Starting Page | 880 |
| Ending Page | 880 |
| File Size | 53750 |
| Page Count | 1 |
| File Format | |
| ISBN | 9781424409150 |
| ISSN | 07309244 |
| DOI | 10.1109/PPPS.2007.4346186 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2007-06-17 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Lighting Flashover Surface discharges Voltage Pulse measurements Rough surfaces Surface roughness Dielectrics and electrical insulation Fault location Solid state circuits |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electrical and Electronic Engineering Condensed Matter Physics Atomic and Molecular Physics, and Optics |
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
Learn more about this project from here.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Education, through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
| Sl. | Authority | Responsibilities | Communication Details |
|---|---|---|---|
| 1 | Ministry of Education (GoI), Department of Higher Education |
Sanctioning Authority | https://www.education.gov.in/ict-initiatives |
| 2 | Indian Institute of Technology Kharagpur | Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project | https://www.iitkgp.ac.in |
| 3 | National Digital Library of India Office, Indian Institute of Technology Kharagpur | The administrative and infrastructural headquarters of the project | Dr. B. Sutradhar bsutra@ndl.gov.in |
| 4 | Project PI / Joint PI | Principal Investigator and Joint Principal Investigators of the project |
Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon |
| 5 | Website/Portal (Helpdesk) | Queries regarding NDLI and its services | support@ndl.gov.in |
| 6 | Contents and Copyright Issues | Queries related to content curation and copyright issues | content@ndl.gov.in |
| 7 | National Digital Libarray of India Club (NDLI Club) | Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach | clubsupport@ndl.gov.in |
| 8 | Digital Preservation Centre (DPC) | Assistance with digitizing and archiving copyright-free printed books | dpc@ndl.gov.in |
| 9 | IDR Setup or Support | Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops | idr@ndl.gov.in |
|
Loading...
|