TIME-DOMAIN ANALYSIS of TRANSFORMERS by USING MODIFIED NODAL EQUATIONS

Developing adequate mathematical models for transformers is very important especially in the analysis of power systems with computer. The efficiency of these models is based on power and speed of the method used. In this study, it´s shown how to use the modified nodal method, which is very important and effective in circuit analysis, in the time-domain analysis of transformers. The basis property of this method is that it allows the system equations to be obtained very easily and quickly. It´s given a model which contains all equivalent circuit parameters relating to transformer and depends on nodal equations. The computed transient-state waveforms are compared with the experimentally measured ones, and it´s shown that there exists very close agreement between them. Furthermore, it´s also added the transfer function and impulse response concerning the system