Computation of internal voltage distribution in transformer windings by utilizing a voltage distribution factor

Computation of internal voltage distribution in transformer windings by utilizing a voltage distribution factor

Theocharis, A. (Higher Colleges of Technology)
Popov, M. (TU Delft Intelligent Electrical Power Grids)
Terzija, Vladimir (The University of Manchester)

2016

In this paper, a method for the application of the black-box transformer models to the lumped-parameter transformer winding models is presented. The methodology is based on applying terminal transformer voltages as input parameters that could be provided by using the powerful black box vector fitting. Then, internal voltage distribution is determined by applying a lumped-parameter model approximation. In particular, the paper is focused on the direct computation of the internal voltage distribution, by avoiding a complicated procedure of solving the lumped-parameter winding model. The method is based on the transformation matrix utilization of the voltage distribution factors. This transformation matrix reflects the voltage distribution at specific internal points along the winding with respect to the input terminal voltages. At this stage, the inputs for the lumped-parameters model are provided by measured voltages at transformer terminals and the transformation matrix is determined through geometrical data of the transformer. The implementation of the proposed method with the black-box modeling approach in existing simulation software tools like EMTP is under development. The method is verified by comparing measured with computed waveforms.

Lumped-parameters model
Overvoltages
Internal voltage distribution
Transformer
Transients
Modeling

http://resolver.tudelft.nl/uuid:d0c4f4a9-db11-4bae-82b9-db790c41970f

https://doi.org/10.1016/j.epsr.2016.01.001

2018-06-07

0378-7796

Electric Power Systems Research, 138, 11-17

Accepted Author Manuscript

Institutional Repository

journal article

© 2016 A. Theocharis, M. Popov, Vladimir Terzija