PORTRA system
The PORTRA system is a design of overhead line masts that makes it possible to lay overhead lines with an operating voltage of up to 110 kV on relatively low wooden masts . It is mainly used for temporary lines.
For this purpose, a U-shaped bracket is installed on the wooden mast, which carries a horizontal insulating cross member for three conductors . Two of the conductor cables are on the outside and one in the middle above the mast.
As credit booms are portal masts used in wood.
Executed lines
- UW Sindelfingen – Böblingen / West (1977–1995)
- Plant 9461 of EnBW AG south of Göppingen