Dead-end tower
A Abspannmast is a special pylon, at the end, the conductors of a power line or a portion of it mechanically. In most cases the overhead line is continued directly on the other side of the mast with a new section, but they can also be continued on another route, for example via an underground cable.
Method of construction
At tension towers, insulators do not hang as supporting poles vertically on the mast, but directed by the mechanical train in the direction of the conductor from.
If the line is continued on the other side of the mast, make the most free-hanging under the isolators current loops establish the electrical connections between the conductor cables of both pipe sections. In general, the current loop of the connection of the two free ends of the conductors is formed.
Since credit booms not only the weight of the conductors wear, but also the tensile forces and changes in direction of the route also must absorb transverse forces, they are usually built as a stable suspension towers.
Use
Credit booms are used as a rule where overhead lines change direction ( Eckmast ). Also the last post before the introduction of an overhead line in a switchboard or in the transition to an underground cable is almost always a tension tower.
Branch masts are also mostly guy masts.
Credit booms are often found - especially in older lines as the German North -South line - on both sides of the crossing of a railway line, a river or a valley. In addition to their higher capacity they offer at the same height a higher ground clearance of the conductor cables, as they are attached at about the height of the crossbeam at the mast and not at the bottom of a hanging on the cross beam insulator.
Since conductors for overhead lines can not be made longer than about five kilometers at a stretch, you have a Abspannmast provide a transition from one line section in the following also in straight pipeline route at the latest after this length of cable.
Special forms of the guy mast are the guy portal and the finishing period.
Special
A special Abspannmast represents the tension tower in the lake of Santa Maria, which stands on a base in a reservoir.
Of the 110- kV traction current by Fulda 30 credits masts are consecutive.
Gallery
Wood Abspannmast EnBW in Würmtal
Special form mast separator
Abspannmast at the transfer station RWE - Stadtwerke Unna
Conduit to the Traverse
Steel pipe Abspannmast
Concrete Abspannmast 310 of the line Innertkirchen - Littau - Mettlenstrasse
Abspannmast of the 380 kV line Etzenricht - Prestice
At this Abspannmast the ladder distances for crossing the Kettle Valley increased
The tension towers of the Elbe crossing 2 must absorb very high tensile forces