Presentation on substation

1. POORNIMA GROUP OF INSTITUTIONS
Prepared By: SHG group
Aditya, Ankit,Amit
1st year
Branch-Mechanical
Section- C Batch-1st

3. contents
 Introduction of witricity
 What is witricity
 Principle
 Method used in power transmission
 Wireless charging system
 Witricity electricity transfer
 Working process
 Advantages and disadvantages
 Application
 conclusion

4. Introduction
 In 1891Tesla invented ac generator that provides our
 light and electricity
“Nikola Tesla, the eccentric - and unbelievably under-rated -
genius known as the ‘wild man of electronics’, was without
doubt one of the greatest minds in the history of the human
 Now in 2007 A team of US researchers has come up with
an electricity system that does not need wires
 . The scientists, from the Massachusetts Institute of
Technology, a 60-watt light bulb using magnetic fields
 In the test, the power source was just two meters away from
the light

5. Introduction……..
 The team leader Marine solijacic and there member hopes
they will soon be able to send electricity longer distances
through the air. They have dubbed their new invention
“WiTricity”, or wireless electricity

6. what is witricity
 Witricity is nothing but wireless electricity
 Transmission of electrical energy from one object to
another without the use of wires is called as Witricity
 Witricity will ensure that the cellphones, laptops, iPods
and other power hungry devices get charged on their own,
eliminating the need of plugging them in
 Even better, because of Witricity some of the devices won't
require batteries to operate

7. Principle of witricity
 Consider two self resonating copper coils of same
resonating frequency with a diameter 20 inches each
 One copper wire is connected to the power source
(Witricity transmitter), while the other copper wire is
connected to the device ( Witricity Receiver)
 The electric power from the power source causes the
copper coil connected to it to start oscillating at a
particular (MHz) frequency
 This is known as 'coupled resonance' and is the principle
behind Witricity

8. Methods used for power transmission
 Two method
 1.Induction coupling(inductive coupling)
The simplest example for wireless energy transfer using this
method is the electrical transformer
primary and secondary circuits are electrically isolated from
each other
A larger, stronger field can be used for energy transfer over
long distance, but this process is extremely inefficient
magnetic field spreads in all direction, making a large
wastage of energy

9. 2. Resonant induction
 Electricity traveling along an electromagnetic wave can
tunnel from one coil to the other as long as the both have
the same resonant frequency
 Similarly if two coils resonate at different frequencies
nothing will happen
 By using resonant induction one coil can send electricity to
several receiving coils as long as they all resonate at same
frequency

10. Wireless Charging System
 Transfer electric power to mobile nearby devices (less
than several meters) and charge batteries

11. Wireless Charging System
11

12. Technical Trends
12
 WiTricity-Haire
 WiTricity, a spin-off company from MIT
 Power transfer to Full HD TV in CES 2010
 Intel
 12W power transfer to notbook in 3feet
 Receiver coils in the cover of notbook
 Independent standardization activity on
100W wireless power transfer
 Sony
 Power transfer to 22 LCD TV 60W
 Efficiency: about 80% 50cm
 Charging distance increases by repeaters

13. Witricity electricity transfer
1) Power from mains to antenna, which is made of copper
2) Resonates 10MHz (electromagnetic waves)
3) Tunnel up to 2m (6.5ft)
4) Electricity received by antenna, also resonating at 10MHz.
5) Energy not transferred to laptop re-absorbed by source
antenna. People/other objects not affected as not resonating at
10MHz

14.  Most common form of wireless power is carried out, using
electrodynamic induction , microwaves or lasers

15.  2 copper coils are setup-one at the ‘sender end’ and other at
the ‘receiving end’. The sender coil is attached to a power
source and the receiver is attached to a light bulb
 When turned on, the sender coil emits electricity in the
form of magnetic field, oscillating at a specific freq
 The receiver coils picks up the transmission while the rest
of the environment remains unaffected
Witricity working process

17. Application
 Witricity has a bright future in providing wireless
electricity
 Some of the potential applications are pwering of cell
phones, laptops and other devices that normally run with
the help of batteries or plugging in wires
 By the use of witricity there is no need of batteries or
remembering to recharge batteries periodically. If a source
is placed in each room to provide power supply to the
whole house
 It would not interfere with radio waves and it is cheap and
efficient

18. Advantage of witricity
 Transmission can be possible if there is any obstructions
like wood and metal, or other devices were placed in
between the transmitter and receiver
 No need of power cables and batteries - Witricity replaces
the use of power cables and batteries
 Does not interfere with radio waves
 Wastage of power is small
 the use of resonant coupling wave lengths produced are far
lower and thus make it harmless

19. Reduce this nest of wire by witricity

20. Disadvantages
 1. Wireless power transmission can be possible only in few
meters
2. Efficiency is only about 40%
 As witricity is in development stage, lot of work is done for
improving the efficiency and distance between transmitter
and receiver

21. Conclusion
 Witricity is in development stage, lots of work is to be done
to use it for wireless power applications
 Currently the project is looking for power transmission in
the range of 100w
 Before the establishment of this technology the detailed
study must be done to check whether it cause any harm on
any living beings

22.  Query…….

23.  Thank you….