Belt cable

Belt cables are multi-core underground cables in the low and medium voltage network , which have a common additional wrapping of insulating paper over the stranded, insulated cores and a metal jacket with a protective cover.

Wrapped paper strips , which are soaked with a viscous, insulating liquid and wrapped with a common paper insulation (belt), form the insulation. The paper insulation is of very high quality electrically, but it must be protected against moisture by a waterproof lead made of lead . Therefore, they have a metal jacket. To protect against mechanical damage, the soft lead jacket is surrounded by bitumen- soaked fiber layers and a steel reinforcement above, which in turn is protected from chemical influences by a PVC jacket.

Three-wire terminations filled with cable impregnation compound have established themselves for belt cables.

Assembly instructions

The cable cores are divided in a metal housing and led to the connection points through flexible insulating tubes. Impregnating compound can be refilled to compensate for any possible mass requirements of the cables. To ensure subsequent impregnation, the gussets and the spaces between the core and sheath must not be tightly wrapped. To simplify maintenance, the sealing ends are provided with sight rings for checking the mass level and with filler necks.

Maximum permissible height differences for belt cables with vertical arrangement: with up to 6  kV nominal voltage: max. Difference in altitude: 50 m. The belt cable is used as an underground cable when increased corrosion protection is required.

literature

• Mario Kliesch / Frank Merschel: Power cable systems. In: Rolf Rüdiger Cichowski (Ed.): Book series systems technology . 2nd Edition. EW Medien und Kongresse-Verlag, Frankfurt 2010.
• Theodor Buchhold, Hans Happoldt: Electric power plants and networks . Springer-Verlag, 2013, ISBN 978-3-662-25887-3 , pp. 205 ff . ( Google Books page 205 ).