NDLI: Numerical evaluation of the effects of phase admittances asymmetry at HVAC overhead lines

Content Provider	IEEE Xplore Digital Library
Author	Pana, A. Baloi, A. Molnar-Matei, F.
Copyright Year	2015
Description	Author affiliation: Politeh. Univ. of Timisoara, Timisoara, Romania (Pana, A.; Baloi, A.; Molnar-Matei, F.)
Abstract	The paper offers an answer to the question: a high voltage overhead line, operating in no load conditions, “generates” active power (energy)? In order to justify the answer, a case study on an untransposed 110 kV single circuit overhead line was used, for which the no load operating condition has been studied using phase amounts. For this goal, applying the modified Carson's equations and the Kron's method of reduction, were determined the equivalent phase impedances and admittances matrices. Numerical analysis of stationary no load operating conditions, demonstrates that on two of the phases the overhead line takes active power from the network, that delivers back to the network on the third phase. On the whole three phases the sum of the active powers at the beginning of the line results of a value much smaller than the phase active power being actually consumed power, corresponding to line losses. Actually the line doesn't generate active power, but its measurement system indicates a negative value for the sum of the active powers redistributed by the line between the network phases, due to the asymmetry of the measurement errors of the elements installed on different phases. Of these elements, the most presumably are the current transformers, known that at low values of the currents have large measurement errors for both rms and angle.
Starting Page	1
Ending Page	6
File Size	330295
Page Count	6
File Format	PDF
e-ISBN	9781479984169
DOI	10.1109/ISNCC.2015.7174702
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-06-15
Publisher Place	Poland
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Measurement errors Electric potential Transmission line matrix methods unbalance HV overhead lines phase admittances Receivers Conductors asymmetry Impedance Mathematical model phase impedances
Content Type	Text
Resource Type	Article

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