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Sunday, July 26, 2020 | History

2 edition of Digital computer calculation of corona thresholds in nonuniform fields found in the catalog.

Digital computer calculation of corona thresholds in nonuniform fields

Mohamed Said Abou-Seada

Digital computer calculation of corona thresholds in nonuniform fields

by Mohamed Said Abou-Seada

  • 133 Want to read
  • 17 Currently reading

Published .
Written in English

    Subjects:
  • Corona (Electricity) -- Measurement -- Computer programs.,
  • Electric power distribution -- Direct current.

  • Edition Notes

    Statementby Mohamed Said Abou-Seada.
    The Physical Object
    Paginationviii, 165 [i.e. 166] leaves :
    Number of Pages166
    ID Numbers
    Open LibraryOL15203461M

    COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus. The corona discharge along the field lines and that field lines ending outside 0 65° usually originate on the point surface outside the ionization region. The Warburg distribution is sketched in Fig. 1. In point-to-plane unipolar current coronas, as well as in wire-cylinder or wire-plane ones, space.

    Breakdown and Corona Excitation of molecules and photon emission occur simultaneously with ionization Secondary ionization processes, due to impact of ions or photons, play a crucial role in breakdown In non-uniform fields, such as in a Conductor –Plane gap, only partial breakdown or Corona . A novel method has been proposed for indefinite nonstochastic acceleration of particles by electrostatic waves propagating normal to a magnetic field. Use is made of a magnetic field inhomogeneity to prevent the particle from detrapping from the electrostatic wave. Numerical plots .

    in the fields of industrial and medical applications in the near future. Currently, this process is limited by corona, and complete discharges, due to the highly inhomogeneous electric fields generated by these geometries. This work proposes a new analytical model to be used for approximating the corona onset thresholds for general electrospraying. A method for time aligning audio signal, wherein one signal has been derived from the other or both have been derived from another signal, comprises deriving reduced-information characterizations of the audio signals, auditory scene analysis. The time offset of one characterization with respect to the other characterizationis calculated and the temporal relationship of the audio signals with.


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Digital computer calculation of corona thresholds in nonuniform fields by Mohamed Said Abou-Seada Download PDF EPUB FB2

DIGITAL COMPUTER CALCULATION OF CORONA THRESHOLDS IN NONUNIFORM FIELDS. Iowa State University, Ph.D., Engineering, electrical University Microfilms, A XEROX Company, Ann Arbor, Michigan THIS DISSERTATION HAS BEEN MICROFILMED EXACTLY AS RECEIVED.

Recommended Citation. Abou-Seada, Mohamed Said, "Digital computer calculation of corona thresholds in nonuniform fields " (). Retrospective Theses and by: 2. Digital computer calculation of corona thresholds in nonuniform fields By Mohamed Said Abou-Seada Topics: Corona (Electricity), Electrical engineering, Electrical and ElectronicsAuthor: Mohamed Said Abou-Seada.

The digital computer program provided values of the potential and both field components anywhere in the gap with an accuracy of about 2 percent. View Show abstract.

All theoretical methods for calculating corona thresholds in a nonuniform electric field depend on precise knowledge of the field distribution near the stressed electrode. The charge simulation technique and the method of images were applied to two twin parallel cylindrical conductors, all located in the same horizontal plane above ground.

The charge on the positive and negative subconductors Cited by: 8. Book contents; Gaseous Dielectrics II. Gaseous Dielectrics II. Proceedings of the Second International Symposium on Gaseous Dielectrics, Knoxville, Tennessee, U.S.A., March 9–13,Pages EFFECT OF POLARITY ON THE BREAKDOWN VOLTAGE OF GAS GAPS.

Measurements have been made of corona-threshold and breakdown voltages in dry air in nonuniform fields for a sphere-hemisphere electrode configuration. For a particular size of outer hemisphere, the electrostatic field was changed from quasiuniform to nonuniform either by using various sizes of inner spheres for concentric arrangements, or, for eccentric arrangements, by varying the.

In nonuniform and highly nonuniform electric fields and in presence of a Gaseous medium, if voltage is increased steadily from low value, the gas close to highly nonuniform field electrode ionizes. This phenomenon, in general, is termed as Corona inception or corona onset voltage.

At the voltage of occurrence of Corona inception, ionization. Insulation design employing discharge simulation based on physics phenomena is used in designing electrical instruments to facilitate their miniaturization and obtain high insulation reliability.

Download Citation | Onset voltage of corona in SF6-N2 mixtures | The onset voltages of positive and negative coronas are theoretically predicted for SF6-N2 mixtures.

For positive onset, the method. In a nonuniform field gap, if the average field in the gap, E av (= V/H), is greater than times the maximum field, E max, the corona phenomena will be similar to those in a uniform field, i.e.

breakdown will occur without any preceding corona. In coated electrode–plane gaps, E max is the maximum electrical field value at the coating surface. Corona Onset Values To calculate the dynamic capacitance, it necessary to determine corona onset values first.

is The critical field strength E of air in the vicinity of a practical power line ctfn be expressed as = gom6f (1 + 0. 3 / G 0) EC. A method is described for calculating the onset of positive corona in rod–plane gaps in air as influenced by temperature. The method is based on the criterion of self-sustained luminous filamentary streamers in the gap.

The onset voltage is a prerequisite for calculating the current voltage characteristics using an iterative method that correlates the corona space charge density to the. References 1 M.S.

Abou-Seada and E. Nassar, Digital computer calculation of the electric potential and field of a rod gap, Proc. IEEE, 56 () 2 H. Singer, H. Steinbigler and P. Weiss, A charge simulation method for the calculation of high voltage fields.

Along with field data, analysis of various problems and calculations using the Digital Computer have advanced the state of the art of e.h.v. line designs to a high level of scientific attainment. Most basic mechanisms are now placed on a firm footing, although there is still an endless list of problems that requires satisfactory solution.

Effect of system voltage – The electric field intensity around the conductor depends on the potential difference between the conductors. If the potential difference is high, electric field intensity is also high, and hence corona loss is also high.

Effect of Frequency – The corona loss is directly proportional to system frequency.; Effect of Density of Air – The corona loss is inversely. Abstract: The conditions under which corona first occurs for any set of electrodes are an important design consideration since corona can limit the performance of any given configuration of electrical conductors.

Here, the 60 Hz ac corona onset voltage for a stranded wire in air is calculated. The criterion involves the characteristics, i.e. composition and pressure, of the gas in which the.

high-voltage transmission lines, is corona. The localized electric field near a conductor can be sufficiently concentrated to ionize air close to the conductors.

This can result in a partial discharge of electrical energy called a corona discharge, or corona. Sev eral factors, including. It could help, in addition, determine the effect of other factors thatare unrelated to corona on the measured waves, as for instance, the effect ofconductors’ addition to the field experiments and to their computer simulation, morestudies should be conducted on scaled down transmission lines, as the onesreported in references [ A corona discharge is an electrical discharge brought on by the ionization of a fluid such as air surrounding a conductor that is electrically neous corona discharges occur naturally in high-voltage systems unless care is taken to limit the electric field strength.

A corona will occur when the strength of the electric field (potential gradient) around a conductor is high enough. Corona effect or corona discharge is a phenomenon that results from a partial discharge in the air (or in any fluid) caused by the ionization of the environment when an electrical current flows in a conductor and when the electric field gradient [1] is strong enough to ionize the environment, but it is not strong enough to cause dielectric.nonuniform field gap stressed by a dc voltage[4].

Above the critical pressure pc, the breakdown occurs immediately unpreceded by corona. This is called direct breakdown. At pressures smaller than pc, the breakdown is preceded by corona in the so called "corona-stabilized region ".

The corona-stabilization phenomenon is explained in terms of.Corona and its Effects Evan Mayerhoff High Voltage Connection, Inc.

Corona is a phenomenon that has the capability for degrading insulators, and causing systems to fail. In this discussion, formulas are provided to calculate the voltage at which corona occurs, and a mention is made of a useful application for corona. What is Corona?