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superconductivity and its applications
1.
2. Super conductivity
General properties
Observations regarding
Applications
3. Super conductor are the material having
almost zero resistivity and behave as
diamagnetic below the super conducting
transition temperature.
Super conductors are PERFECT conductors.
4. Virtually zero electrical resistance.
Perfect diamagnetic property.
Critical field depends upon temperature of superconducting
material.
Heavy current effect destroys superconductivity properties.
At very high pressure Tc is directly proportional to pressure.
Tc is inversely proportional to square root of At.wt of the
isotope of single superconductor.
5. LONDON THEORY -1935
GINZBURG-LANDAU THEORY – 1950
BARDEEN, COOPER, SCHRIEFFER THEORY - 1957
6. Principle:
The electron experience a special kind of attractive
interaction, over coming the coulombs force of repulsion between
them, as a result cooper pairs are formed.
At low temperature , these pairs move through lattice
without resistance and hence behave as superconductor.
13. Can carry large quantities of energy without heat loss.
Able to generate strong magnetic fields.
Superconductors beneficial applications in medical
imaging techniques.
New superconductive films may result in
miniaturization .
Superconductors increased speed in computer chips.
14. Superconducting materials conduct current
at only given temperature known as
transition temperature.
Superconductorsstill do not show up in most
everyday electronics.
15. Principle:
Persistent current in D.C voltage.
Construction:
A thin layer of insulators is placed between the
superconductors.
Both superconductors are connected to a battery .
Working :
LET US SEE THE WORKING OF JOSEPH
DEVICE IN THE SUCCEEDING SLIDES.
19. Super conducting generator
Super conducting transmission line cables
Superconducting magnetic energy storage system (smes)
20. Converts mechanical to electrical energy.
Own magnetic field is produced.
Current and flux density determines the output.
Field windings produces higher magnetic field.
Superconductors have extremely high current
carrying capacity.
21.
22. Provides ZERO resistance.
Due to LOW VOLTAGE, high current transmission
occurs.
SMALL physical size.
Reduced CLEARANCE for terminal faculties.
Quick RECOVERY after fault.
Overload capability.
23. Current carrying wire generates a magnetic
field.
Superconducting solenoids made by wrapping
a superconducting wire in the coil from are
functionally superior to conventional
solenoids.
Zero DC electrical resistance.
No resistive losses.