Abstract
Calculation and measurement of the overhead power lines electrical parameters is common practice in today’s electrical engineering industry; however, there is very little data to actually compare these two approaches because measured data in such detail are mostly unavailable for academic purposes. Based on the very detailed model of an overhead power line in MATLAB Simulink environment and conducted experimental measurement, this article specifically covers the exact evaluation of the impedance of the investigated overhead power line. Differences between calculation and experimental measurement are shown and discussed accordingly, where, surprisingly, the biggest deviation was observed in the positive resistance parameter. The connection between different measurement techniques (multiple single-phase and three-phase methods), as well as the power line asymmetry reflection in the impedance matrix is explained as well as compared to expected values from the computations. The complete mathematical approach for electrical parameters evaluation from different measurement methods is explained step-by-step, and the final equations are introduced for each method. Proposed methods of obtaining the electrical parameters of the power line are then concluded as the ones with great accuracy and wide usage in practical applications. It shows the great importance of correct input data for the electrical parameters’ theoretical computations and the need to know the measurement methodology and apparatus perfectly to process the measured data and interpret them correctly.
Highlights
Most power system applications use system impedances as a mathematical definition of particular equipment
This paper describes calculation and measurements methods of the overhead power lines in order to evaluate electrical parameters
Attention is focused on the exact evaluation of the impedance of the investigated overhead power line by calculation, and subsequent comparison with evaluation obtained from the simulation results and different measurement approaches
Summary
Most power system applications use system impedances as a mathematical definition of particular equipment. Among such can be included applications as data analysis and digital relay data analysis, protection settings, planning models for load flow and dynamic calculations, short-circuit and post-event analyses, real-time and offline models, etc. Accurate knowledge of impedance parameters helps to improve accuracy in many areas of electrical power engineering. Accuracy is important in the area of simulation calculation due to improvement of power line modeling, such as state estimation or operation planning calculations [4,5,6,7]
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