Lightning impulse type overvoltage transmitted between the windings of the transformer

This paper presents a calculation method for voltage transmitted between the windings of the transformer while it is being subjected to the lightning impulse; it describes the reasoning and analytical relations for the predetermination of the transmitted voltage. Software was developed in LabVIEW, in order to make the calculation more efficient and to illustrate the corresponding waveforms of the transmitted voltage determined by calculation. The study was conducted on a 50/67 MVA, TTU-SONAN, 132/13.8/6.6 kV transformer, and the results achieved by calculation have been validated through experimental tests.