Dielectric strength, Physics

Electrical Properties of Dielectric Materials

The term "Dielectric strength" of a dielectric material means the maximum electric field strength that it can withstand intrinsically without breaking down i.e.; without knowing about failure of its insulating properties. The hypothetical dielectric strength of a material is an intrinsic property of the bulk material and is not dependent on the configuration of the material or the electrodes by which the field is applied. At breakdown, the electric field release bound electrons, converting the material into a conductor. The field strength at which breakdown takes place in a given case is dependent on the respective geometries of the dielectric (insulator) and the electrodes with which the electric field applied; as well as the rate of increase of applied electric field. The dielectric strength is otherwise called as the breakdown voltage. All electrical apparatus are intended to work at particular voltage. If this operating voltage is slowly increased, then at some voltage, the dielectric used in the apparatus gives away. Therefore, the voltage below which the dielectric material remains stable in its property, but above which it result in the destruction of insulating properties is called "Breakdown voltage". In other words dielectric strength is defined as the property of an insulator which enables it to withstand continuous electric stress or the maximum electrical stress which it will successfully withstand. It is expressed in terms of KV/mm or kV/cm under specified conditions.


Factor Affect acting Dielectric structure:

(1)Dielectric strengths decrease with rise of temperature in case of air. In case of liquid insulators the effect with the type of oil and its viscosity.

(2)Humidity generally decreases the value of dielectric strength.

Posted Date: 7/7/2012 5:41:29 AM | Location : United States

Related Discussions:- Dielectric strength, Assignment Help, Ask Question on Dielectric strength, Get Answer, Expert's Help, Dielectric strength Discussions

Write discussion on Dielectric strength
Your posts are moderated
Related Questions
Properties of laser: Lasers have applications in various disciplines of science and technology. They also find applications in industry, medicine and defence and space science

Given a particle moving along a straight line with fixed acceleration a. Let u be the initial velocity of the particle and v be the velocity at time t. So by definition,

(i) It having of district bright bands. (ii)It is given by an excited source in molecular state. (iii) E.g. Spectra of molecular NH 3 , CO, H 2 etc.

What is the echo of the launched pulse? Any discontinuity into the medium of propagation of an ultrasonic pulse provides rise to back-reflection that travels back to the input

A current transformer has two turns on the primary winding and a secondary winding of 260 turns. The secondary winding is connected to an ammeter with a resistance of 0.2.The

A 15.2-kg police battering ram exerts an average force of 125 N on a 10.0-kg door. a. What is the average acceleration of the door? b. What is the average acceleration of th

recombination of electrons and holes impurity semiconductor

The turning movement of a particle about the axis of rotation is called the angular momentum of the particle and is measured as the product of the linear momentum and the perpendic

calculate the acceleratio due to gravity on planet mercury if mass = 2.99 x 10 9to the power 23)kg and radius = 2.42 x 10( to the power 6) metres.

The stress at which the specimen breaks or reptures ultimately is known as ultimate strength. We also called this TENSILE STRENGTH .