Classification of dielectric, Physics

There are thousands of insulating materials available in the market. Insulations technology is one of the few branches where the number of materials is very large. Any special requirement can be served by some special material. The requirement of good insulating materials can be classified as electrical, mechanical and chemical. Electrically the insulating material has high resistivity to reduce the leakage current to reduce the high dielectric strength to enable it to withstand higher voltage without punctured or broken down. Since the insulators are use on the basis of volume and not weight, A low density is preferred similarly a uniform viscosity for liquid insulates insures uniform thermal electrical properties. Chemically the insulators should be resisting of oils, liquid gas, fumes, acids, and alkalis. It should not deteriorate by the action of chemical in the acids or by contact with other metals. Insulating materials must have some mechanical properties on the basis of the use to which they are put. Thus when used for electric machine insulation the insulator should have sufficient mechanically strength to vibration. Hence an ideal insulating material should possess:

 

(1)Dielectric strength as good as that of mica,

 

(2)Volume and surface resistivity equal to that of sulphur,

(3)Mechanical strength as good as that of steel,

(4)Crushing resistance as that as good as granite,

(5)Ease of machining as that as good as that of wood,

(6)Fire proofing as good AS that of silica,

(7)Chemical inertness is equal to that of platinum,

(8)Surface finish like that of ebonite,

(9) Water proofing quality as good as that of paraffin wax.

Posted Date: 7/7/2012 5:59:47 AM | Location : United States







Related Discussions:- Classification of dielectric, Assignment Help, Ask Question on Classification of dielectric, Get Answer, Expert's Help, Classification of dielectric Discussions

Write discussion on Classification of dielectric
Your posts are moderated
Related Questions

What is the equation of wavelength related with a moving particle?

The average energy needed to release a nucleon from the nucleus is known as binding energy per nucleon.   Binding energy per nucleon diffrence  Stability of nucleus

An electron is in a box of width 3*10^-10m.what are de broglies wavelength and magnitude of momentum of the electron if it is in A)n=1 level B)n=2 level C)n=3 level Ans)  Use the

Infra-Red (IR) Detectors:   An IR detector has an impedance of Z= (400+j200) ?  . During design  tests the detector  current  is measured  as  4  µA. What  is  the output v

Define Poisson Distribution in Ideal Gas? Consider a monatomic ideal gas of total Ñ molecules in a volume V ˜ Show that the probability, P N for the number N of mole

A helium atom is in a galaxy travelling at a speed of 4.89 x 10 6 m/s away from the Earth. An astronomer on Earth observes a frequency from the helium atom of 6.52 x 10 14 H

Describe how optical fibers used as hydrophones. Optical fibers are employed as hydrophones for sonar and seismic applications. Each hydrophone systems along with more than one


Q. What are the affect does electricity have on the soil? Answer:- Electrical current and ions are able to cause certain molecules (and moisture) to adhere to soil. Large