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Ukpong, U. A.
Department of Electrical and Electronic Engineering, Michael Okpara University of Agriculture, Umudike, Abia State, Nigeria
Okoro, C. K.
Department of Electrical and Electronic Engineering, Michael Okpara University of Agriculture, Umudike, Abia State, Nigeria
Ezeonye, C. S.
Department of Electrical and Electronic Engineering, University of Agriculture and Environmental Sciences, Umuagwo, Imo State
Obi, P. I.
Department of Electrical and Electronic Engineering, Michael Okpara University of Agriculture, Umudike, Abia State, Nigeria
ABSTRACT
Power designer has sought several means to
reduce the discharges in form of ozone gases called corona effect that
diminishes conductor on high voltage overhead transmission lines. Various
factors affect the corona loss in transmission lines, some of which are natural
and some are equipment-related. While we cannot control the natural causes, we
can take certain measures to prevent corona. This paper considers a corona
mitigation model for a single-conductor single-phase line, but the model can be
extended to multi-conductor and multi-phase cases. The model employed Peek’s
mathematical equations which was modeled using matlab application tool. From
the results obtained, the corona loss decreases with a decrease in applied
voltage and also by the implementation of the maximum length leading to the correction of the irregularity
factor mo with high voltage values of 300 and 400 kV. Consequently,
corona loss decreased as conductor radius is increased. At maximum voltage of
400 kV, the corona loss due to the mitigation models was completely dropped to
0 kW/km. This paper helped in determining the capacitive effect
of a line under corona surge using dynamic capacitance theories. Although
corona power can be acceptable to a certain level, it should always be
considered when designing transmission systems, along with resistive power loss
calculations.
Keywords: Capacitance, Corona discharge, Critical Voltage, Mitigation Model, Peek’s Equation, Single Conductors
https://doi.org/10.33922/j.ujet_v10i1_21
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View: 41 | Download: 15
Published
Tuesday, April 23, 2024
Issue
Vol. 10 No. 1, June 2024
Article Section
GENERAL
The contents of the articles are the sole opinion of the author(s) and not of UJET.
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