3 MW converter for high power universal locomotive based on a deionized water cooled GTO module: improvements and type tests

The authors describe the characteristics and the design criteria of an inverter based on a new deionized water cooled GTO module for a 6 MW high power universal locomotive. This module allows the use of the largest power components available on the market and the construction of compact high power converters. As a consequence of the use of deionized water as a cooling medium, the most important features of the converter physical design are insulation and corrosion phenomena. In particular, the authors describe corrosion and conductivity tests carried out for more than one year on a prototype of the converter module