A series of high-power GTO power converters with intermediate DC voltage links for use in main line locomotives is described in this paper. This series uses valve device assemblies containing 2-state as well as 3-state pairs of arms. These pairs of arms are equipped with 4.5 kV GTOs for 2.5 kA (2- and 3-state) and 3 kA (only 2-state) switch off current. All valve device assemblies are plug-in units, all using the same housing, with all component oil immersed cooled. The combination of the valve device assemblies together with the DC link, smoothing capacitors, the gate drive units, the control electronics and other apparatus forms the converter assembly. This series of power converter assemblies are all designed along the same principles.
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