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1 Electrical Power Quality and Utilisation. Journal

1 2008

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Harmonic domain modelling of transformer core nonlinearities using the DIgSILENT powerfactory software

Wiechowski W., Bak-Jensen B., Bak C. L., Lykkegaard J.

Electrical Power Quality and Utilisation. Journal

2008

Vol. 14, iss. 1

3-11

This paper demonstrates the results of implementation and verification of an already existing algorithm that allows for calculating saturation characteristics of singlephase power transformers. The algorithm was described for the first time in 1993. Now this algorithm has been implemented using the DIgSILENT Programming Language (DPL) as an external script in the harmonic domain calculations of a power system analysis tool PowerFactory [10]. The algorithm is verified by harmonic measurements on a single-phase power transformer. A theoretical analysis of the core nonlinearities phenomena in single and three-phase transformers is also presented. This analysis leads to the conclusion that the method can be applied for modelling nonlinearities of three-phase autotransformers.