DIELECTRIC PHENOMENA IN HIGH VOLTAGE ENGINEERING PDF
Dielectric phenomena in high voltage engineering by F. W. Peek; 7 editions; First published in ; Subjects: Electric power distribution. Dielectric phenomena in high voltage engineering by F. W. Peek, , McGraw- Hill Book Company, inc. edition, in English - 3d ed. Ebook `Dielectric phenomena in high voltage engineering`: ebooks list of F. W. ( Frank William) Peek. download PDF (original scan) · download EPUB.
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Dielectric phenomena in high-voltage engineering
This energy is stored in two forms, electromagnetic and electrostatic. The electromagnetic energy is evinced by the action of the resulting stresses, for instance, the repulsion be- tween two parallel wires carrying current, the attraction of a suspended piece of iron when brought near the wires, or better yet, if the wires are brought up through a plane of insulating material, and this plane is dusted with iron filings, and gently tapped, the filings will tend to form in eccentric circles about the conductors.
These circles picture the magnetic lines of force or magnetic field in both magnitude and direction. This field only exists when current is flowing in the conductors.
If now potential applied between the conductors, but with the far is ends open circuited, energy is stored electrostatically. The resulting forces in the dielectric are evinced by an attraction between the conductors; a suspended piece of dielectric in the neighborhood is attracted.
If the conductors are brought through an insulating plane as before, and this is dusted with a powdered dielectric, as mica dust, the dust will tend to form in arcs of circles beginning on one conductor and ending on the other conductor. See Fig.
The dielectric field is thus made as tangible as the magnetic field. Fig l c is an experimental plot of the magnetic and dielectric fields.
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How do I view solution manuals on my smartphone? Electrical breakdown can also occur across the insulators that suspend overhead power lines , within underground power cables, or lines arcing to nearby branches of trees.
Dielectric breakdown is also important in the design of integrated circuits and other solid state electronic devices.
Insulating layers in such devices are designed to withstand normal operating voltages, but higher voltage such as from static electricity may destroy these layers, rendering a device useless.
The dielectric strength of capacitors limits how much energy can be stored and the safe working voltage for the device. Breakdown is influenced by electrode material, sharp curvature of conductor material resulting in locally intensified electric fields , the size of the gap between the electrodes, and the density of the material in the gap.
Solids[ edit ] In solid materials such as in power cables a long-time partial discharge typically precedes breakdown, degrading the insulators and metals nearest the voltage gap. Ultimately the partial discharge chars through a channel of carbonized material that conducts current across the gap.
Liquids[ edit ] Possible mechanisms for breakdown in liquids include bubbles, small impurities, and electrical super-heating. The process of breakdown in liquids is complicated by hydrodynamic effects, since additional pressure is exerted on the fluid by the non-linear electrical field strength in the gap between the electrodes.The space charge distorts the electric field distribution and introduces the charge migration time between electrodes as an additional time constant over the usual dielectric relaxation and fluid transport times.
These circles picture the magnetic lines of force or magnetic field in both magnitude and direction. Due to the dielectric fields, points in space surrounding the conductors have definite potentials.
Dielectric phenomena in high-voltage engineering
In order that energy may flow along a conductor, energy must be stored in the space surrounding the conductor. In liquefied gases used as coolants for superconductivity — such as Helium at 4. Trans, of the Royal Society A, — Google Scholar Zahn, M.
Edited by ImportBot. The electromagnetic energy is evinced by the action of the resulting stresses, for instance, the repulsion be- tween two parallel wires carrying current, the attraction of a suspended piece of iron when brought near the wires, or better yet, if the wires are brought up through a plane of insulating material, and this plane is dusted with iron filings, and gently tapped, the filings will tend to form in eccentric circles about the conductors.
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