Impact of impedance unbalance on the efficiency of electricity transmission and distribution - A case study

This article is devoted to the analysis of the possible influence of impedance asymmetry on the efficiency of electricity transmission and distribution in the electricity system in Slovakia, at a voltage level of 110 kV - 400 kV, using synchronic phasor monitoring results. For simplicity of calculat...

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Bibliographic Details
Published in:Journal of Electrical Engineering 2017-11, Vol.68 (6), p.492-495
Main Authors: Pavlov, L’uboš, Skurčák, L’uboš, Chovanec, Juraj, Altus, Juraj
Format: Article
Language:English
Subjects:
Asymmetry
Case studies
efficincy of power transmission system
Electric potential
Electric power distribution
Electric power transmission
Electrical engineering
Electricity
Electricity distribution
Energy efficiency
Impedance
losses reduction
Measurement techniques
Monitoring
Phasors
power transmission system
Transformers
Unbalance
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Summary:This article is devoted to the analysis of the possible influence of impedance asymmetry on the efficiency of electricity transmission and distribution in the electricity system in Slovakia, at a voltage level of 110 kV - 400 kV, using synchronic phasor monitoring results. For simplicity of calculations, in practice, the impedance imbalance from mutual interfacial inductive capacitances bonds is neglected. In this way, the 3-phase network is interpreted as symmetrical in the calculations. In this case, it is possible to determine only some components of losses (ohmic losses, corona loss, leakages, etc). The influence of impedance asymmetry can be quantified by calculation using the results of the monitoring of the synchronous phasors of selected electricity system elements (OHL, transformer, choke) or by 3-phase modelling of real system elements. frequency to test the transformer for induced over voltage test, and its characteristics is analysed.
ISSN:1339-309X
1335-3632
1339-309X
DOI:10.1515/jee-2017-0086