Dielectric loss, Physics

Assignment Help:

Electrical Properties of Dielectric Material

A loss of energy which eventually produces a rise in temperature of a dielectric placed in an alternating electric field is called "dielectric loss". The dielectric material separates the two electrodes or conductors are stressed when subject to a potential. When the potential is reversed, this change of stress is reversed involves molecular rearrangement with the dielectric. This includes energy loss with every reversal. This is because then the molecules have to overcome a certain amount of internal in the process of alignment. The energy exhausted in the procedure is released as heat in the dielectric. Dielectric losses results from the heating effect on the dielectric material between the conductors. Power from the source is utilized in heating the dielectric. The heat produced is dissipated into the surrounding material. When there is no potential difference between two potential, the atoms in the dielectric material among them are normal and the orbits of the electrons are circular. When there is some potential difference between two conductors, the orbits of the electrons vary. The excessive negative charge on one conductor repels electrons on the electrons dielectric towards the positive conductor and thus distorts the orbit of the electrons. A change in path of electrons requires more energy, introducing a power loss. The atomic structure of rubber is harder to deform then the structure of some other dielectric materials. Such as polythene, distort easily. Therefore polythene easily is often used as a dielectric because less power in consumed when its electrons orbit is distorted. When a perfect insulator is subjected to insulating voltage it is like applying alternating voltage to a perfect capacitor. In such a case there is no consumption of power. Only vacuum and purified gases approach this perfection in such cases the charging current would lead the applied voltage by 90 exactly. This would mean that there is no power loss in the insulation. In most insulating materials that is not the case. There is definite amount of dissipation energy when an insulator is subjected to alternating voltage. It is dissipation of energy that is called dielectric loss. In commercial insulators the leakage current does not lead applied voltage by exactly 90. The phase angle is always less than 90. For an insulator having a voltage V applied to a frequency f Hz the dielectric power loss can be calculated. 


Related Discussions:- Dielectric loss

Bernoullis equation, Bernoulli's equation In an irrotational fluid, to...

Bernoulli's equation In an irrotational fluid, total of the static pressure, the weight of the fluid per unit mass times the height, & half the density times the velocity squa

Explain general theory of gravitation, Explain General Theory of Gravitatio...

Explain General Theory of Gravitation The idea of a gravitational field takes all the gravitational effects of a given mass like Earth and expresses them mathematically as a grav

Definition of fundamental units, (i) Meter : The presently accepted defini...

(i) Meter : The presently accepted definition of meter is the length of path travelled by light in space in 1/299,792,458th second. (ii) Kilogram : Kilogram is the fundamental

Keplar''s law, 1st law -What is the significance of the second foci of the ...

1st law -What is the significance of the second foci of the elliptical orbit? 2nd law -if the speed of the planet changes,why donot we feel it?

Shear force, The shear force of a cantilever beam of length L carrying a un...

The shear force of a cantilever beam of length L carrying a uniformaly distributed load W Per unit length is how much at fixed end

Explain forging, Forging:   Forging is shaping of metal either by impact or...

Forging:   Forging is shaping of metal either by impact or steady compression among a hammer or ram and anvil. Related to hammering or pressing of metal, the main difference among

Solid state physics, Magnetic susceptibility of copper is 0.5 Calculate the...

Magnetic susceptibility of copper is 0.5 Calculate the magnetic moment per unit volume of copper, when it is subjected to a magnetic field of G. If the material is in the crystalli

Doppler effect wave fronts, Doppler Effect: Wave Fronts Describing the...

Doppler Effect: Wave Fronts Describing the wave fronts of a wave for a moving source. The Doppler effect is a phenomenon experiential whenever the source of waves is moving al

Hr diagram, How to draw hr diagram including life cycle of the sun

How to draw hr diagram including life cycle of the sun

Define electric circuits, Define Electric Circuits So far we have only ...

Define Electric Circuits So far we have only looked at electric charges sitting still and static discharges (like a shock or lightning). When we count on the charges moving thr

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd