Medium voltage/low voltage (MV/LV) transformer substations. 1.1 Introduction. The subject of this Technical Guide is MV/LV substations; in accordance with the .PURPOSE: This bulletin provides a basic design guide and a reference tool for 4.13 APPLICATION OF MOBILE TRANSFORMERS AND SUBSTATIONS.Jul 25, 2018 Acceptable Transformer Connections for We Energies Systems. 170.20. T–Connected Transformers. 170.30. Transformer Taps. 180. Station .Many of today's transformer substations, originally Active distribution grid with intelligent transformer substations. 110 kV* Power range.Substations and switchgear. Consulting and planning for power grids. Devices and components. Services and support. Transformers. Glossary. Protection .