LGSO series are window-type low voltage transformers with an insulation level of 0,72 / 3 / - kV, which can be used in medium voltage networks or in generator voltage busbars with an insulation level of up to 40,5 kV. A prerequisite is a sufficient insulation distance between the primary conductor and the transformer. The primary insulation consists of an air gap and a cast resin insulation. The basis is the general rules for insulating materials and minimum clearances in air-insulated systems in accordance with DIN EN 61936-1. For use in medium voltage systems, the insulation level must be specified depending on the geometric dimensions of the transformer and the diameter of the primary conductor.

The LGSO transformer offers increased heat dissipation due to its optimised design. Thus, currents of up to 40000 A and ambient temperatures of up to 80°C are possible. The current transformer is maintenance-free.