University of Southern Queensland Faculty of Health, Engineering & Sciences Effects of transformer inrush current A dissertation submitted by Kunal J Patel in fulfilment of the requirements of Courses ENG4111 and ENG4112 Research Project Towards the degree of Bachelor of Engineering (Power System)
Abstract
Inrush current in transformer is often gets less importance compared to other
effects/faults. Though the magnitude of inrush current may be in some cases less
than compared to short circuit current, the frequency and duration of inrush current is
generally more frequent, hence it will likely have more adverse effect compared to
other faults. Inrush current may flow when transformer is energised. The amount of
inrush current depends on when in the voltage cycle the transformer is energised and
residual flux in the transformer. The other type of inrush current is sympathetic
inrush current which flows in already energised transformer when another
transformer is energised in parallel connected line.
This report contains basic principle, fundamental theory and relevant laws of the
transformer and inrush current. A number of factors affecting inrush current are
discussed. The inrush current theory and their equation are derived. The effects of
inrush current are described in brief. As a part of this project a number of effects and
factor affecting inrush current are considered for simulation. The Matlab Sim-Power
system is used for the simulation. The simulation results compared with each other
and also data available from actual same size transformer. Finally six solutions to
inrush current mitigation techniques with a practical low cost answer are provided.
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