Voltage transformers type EOF are used in high voltage networks within the 24-245 kV range.  They transform high voltage in to standardized values for meters, measuring and protections devices.

The active part of the voltage transformer is located in the foot housing.  The high voltage insulation is implemented in oil-paper technology.  To achieve this, a high quality PCB-free mineral oil is used.  The fine-graded bushing is inside the insulator.

The expansion system is located in the head of the voltage transformer.  This unit acts as volume compensation for the oil in case of temperature variations.  For voltage transformers of 24-72 kV, a highly flexible, temperature-resistant membrane made from fluoroelastomers (VITON) is used.  Voltage transformers >72 kV have an expansion cell made of stainless steel.  The oil level is indicated by a mechanical system in the window of the beloows cover.

All metal housings and flanges are made from a special aluminum alloy.  These parts can be color coated on request.

All voltage transformers have either a high-quality porcelain or a high-grade silicon composite insulator.  Different creepage distances are available according to the different pollution classes, as specified in the standars.

Ther hermetic-sealed housing protects the oil-papre insulation against atmospheric influences.

The generously-sized terminal box has a cover which can be opened sidewards.  This allows easy connection of the secondary cables.  The terminal box has a flange without holes by default.  Cable glands, circuit diagram and individual safety instructions can be preinstalled on request.