to extract the ice from transmission line by using dielectric loss and skin effect heating.

1. SYNERGY INSTITUTE OF
ENGINEERING AND
TECHNOLOGYSEMINAR ON:DE-ICING OF TRANSMISSION LINE BY dielectric losses
Under theguidance of:-
Mr. AUROBINDO BEHERA
(Asst.prof.) Presented By:-
BhabaniSankarCharan
EE-12-92
1201230197
Electricalengineering
DEPARTMENT OF
ELECTRICAL ENGINEERING

2. CONTENTS
1. Introduction
2. Need of deicing
3. What is dielectric loss?
4. Application of high frequency
5. Types of De-icing process
6. Principle of ice dielectric heating
7. Additional consideration
8. Advantages
9. Disadvantages
10. Conclusion
11. References

3. INTRODUCTION
When accretion of ice takes place over the conductor then
icing occurs.
Icing of power transmission lines during winter storms is
a persistent problem, causing outages and costing millions
of rupees in repair expenses.
Deicing is a process in which ice can removed from the
iced wire.
For de-icing of high voltage transmission lines a high
frequency excitation at approximately 100kHz proposed.

4. NEED OF DEICING
Equipment failure
Tilting and collapsing of tower
 Economic loss

5. DIELECTRIC
 A material that conducts electricity poorly or not.
 However ,under certain condition ,dielectric material
can breakdown and conduct current.
 When electric field applied, flow of electron occurs
for that time only.
 As soon as electric effect is reamed, dipole condition
settles down and again becomes insulator.

6. What is DIELECTRIC LOSS??
 A portion of the energy of an alternating electric field
in a dielectric medium that Leads to heat evolution.
 Dielectric losses depends on frequency and the
dielectric material.

7. APPLICATION OF HIGH FREQUENCY
Fig 1-De-icing of power lines by applying high frequency high voltage

8. TYPES OF DE-ICING PROCESS
 Deicing using roller
 Dielectric heating
 Skin effect heating

9. DE-ICING USING ROLLER
Fig 2-De-icing process using roller

10. Fig 3-Equivalent circuit for ice-coated
transmission line
Ice modeled as a dielectric
material, the equivalent Circuit for
a short section of transmission line
Coated with ice is shown in figure.
The dielectric properties become
sufficiently lossy to generate
significant heating.

11. SKIN EFFECT HEATING
 The crowding of current
near the conductor
surface is called skin
effect.
Fig 4- Skin effect heating

12. ACHIEVING UNIFORM HEATING
Fig 5-Combined ice dielectric and skin-
effect heating at 60 KHz
Fig 6-Combined ice dielectric and skin-
effect heating at 100 kHz, where we
estimate the two effects are optimally
balanced

13. ADDITIONAL CONSIDERATION
EMI
CORONA

14. ADVANTAGES
 In this study we get a cost effective approach.
 This technique is applicable for live line conductors.
 It reduces the tension produced by icing.

15. DISADVANTAGES
 It can cause interference with radio communication
system.

16. CONCLUSION
 Combined di-electric heating and skin-effect heating
can be used to achieve uniform heating , and thus
dielectric loss takesplace.
 The application of 100 kHz electric fields to melting
ice on power transmission lines appears promising.

17. REFERENCES
1. To deice transmission line with 100khz high voltage
excitation by Charles R. Sullivan and victor F.
Petrenko .Thayer school of engineering.
2. Principles of power system by V.K Mehta and Rohit
Mehta.
3. www.brighthub.com