1. Presented By
M. RAJA NAYAK
Research Scholar, ANU, Guntur.
Under The Esteemed Guidance Of
Dr. K.CHANDRA SEKHAR
Professor & HOD,
EEE Department
RVR & JC College of Engineering, Guntur.
2. INTRODUCTION
๏HVDC Transmission lines are playing a key role in
transmitting the bulk amount of power transfer in Power
system.
๏Corona is a type of partial discharge brought on by
ionization of air surrounding a power conductor.
๏Corona discharge occurring on HVDC Line generates
Ionized field environment around and under the
transmission lines.
๏This corona generated ionized field environment is is
different for both AC and DC transmission lines.
3. ๏ The Ionized field environment for AC is confined in the
vicinity of the AC line only due to periodic reversal of he
voltage.
๏ Where as in case of DC it is different i.e. Ionized field is
confined at ground levels also due to constant voltage
applied.
4. ๏ Therefore, the Ionized Field Environment of HVDC
Transmission Lines are characterized by:
โspace charge density
โionic current density and
โElectric field distribution.
5. LITERATURE SURVEY
๏ Some computational work was carried out by few
researchers from various parts of the world.
๏ Yong Yang, Jiayu Lu, Yinzhao Lei presented
a calculation method for the electric field over the
ground surface under double-circuit HVDC
transmission lines to satisfy the engineering design
requirement.
๏ Maruvada P.S presented the electric field and ion current
environment under HVDC transmission lines as an
important design consideration. The flux tracing method
(FTM) for calculating the ground-level electric field and
ion current density distributions is reviewed and the
possible errors caused by the use of Deutsch's
assumption in the FTM are estimated.
6. ๏ Takuma T, Kawamoto T described a new stable method
of calculating ion flow fields in the presence of wind. The
principle of the new method is to use the integral form of
the current continuity equation instead of Poisson's
equation for computing space potential.
๏ Al-Hamouz Z.M presented an adaptive finite-
element interactive method for
the analysis of the ionized field around high-
voltage bipolar direct-current (HVDC) transmission line
conductors without resorting to Deutsch's assumption.
And
๏ He again described interactive finite element technique
for the analysis of mono polar ionized field in
transmission line conductor to plane configurations.
7. OBJECTIVE
๏ Computation of ionic current density, space charge
density and electric field at ground level by using
analytical methods .
๏ Laboratory measurement of ionic current density,
space charge density and electric field at ground level .
๏ Comparison of results of the measurements and
computed values and also compare computed results
with the results presented by analytical methods
published in Literature.
๏ To arrive at a more accurate analytical method as
compared to the existing method.
8. METHODOLOGY
๏ Literature survey and a thorough study on the research
carried out elsewhere in the world in this particular area.
๏ Development of mathematical modelling for Computation of
Ionized Field Environment parameters i.e. ionic current
density, space charge density, electric field at ground level.
๏ Laboratory measurements of the relevant parameters using
the laboratory set up.
๏ Comparison of the results of measurements / results obtained
from developed computational methods / results obtained
from existing methods developed by others.
๏ To arrive accurate computational method based on the
measured results.
9. ๏ New Computational tool may made available to derive
the limit values for ionic current density, and space
charge density to the transmission line designers for the
future up coming UHVDC lines in the country.
10. REFERENCES
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IEEE Transactions on Magnetics, vol. 56, no. 1, pp. 1-4, Jan. 2020, Art no. 7503504, doi: 10.1109/TMAG.2019.2951155.
2. B. Zhang, F. Xiao, P. Xu, Z. Liu and J. He, "Measurement of Space Potential Distribution Around Overhead HVDC Transmission Lines
Based on Potential Compensation on Suspended Conductor," in IEEE Transactions on Power Delivery, vol. 35, no. 2, pp. 523-530, April 2020,
doi: 10.1109/TPWRD.2019.2911650.
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Crossing of HVDC Transmission Lines," in IEEE Transactions on Magnetics, vol. 56, no. 3, pp. 1-5, March 2020, Art no. 7513705, doi:
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10.1109/TMAG.2019.2921996.
5. F. Xiao, B. Zhang and Z. Liu, "Calculation of Accumulated Charge on Surface of Insulated House Near DC Transmission Lines by Method
of Characteristics," in IEEE Transactions on Magnetics, vol. 55, no. 6, pp. 1-5, June 2019, Art no. 7201405, doi:
10.1109/TMAG.2019.2896178.
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10.1109/TMAG.2019.2912904.
8. Yongzan Zhen, Xiang Cui, Senior Member, IEEE, Tiebing Lu, Xuebao Li, Chao Fang, and Xiangxian Zhou, "3D Finite-Element Method for
Calculating theIonized Electric Field and the Ion Current of the Human Body Model Under the UHVDC Lines," IEEE transactions on power
delivery, vol. 28, no. 2, pp. 965-971, April 2013.
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10. Maruvada. P.S, โElectric Fields and Ion Current Environment of HVdc Transmission Lines: Comparision of Calculations and
Measurements,โ IEEE transactions on power delivery, Vol.27 No.1 pp. 401-410, November 2011.
