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    Cables in troughs installations

    The power cable ampacity software offers extended capabilities to support the analyses of cables in both filled and unfilled troughs.
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Perform in-depth analyses on both filled and unfilled troughs

The thermal rating of cables installed in unfilled or filled troughs is determined using the unfilled troughs (CYMCAP/UNF) and the multiple duct banks and backfills modules (CYMCAP/MDB), respectively. The heat transfer mechanism is different for filled and unfilled troughs; therefore, they are treated independently. The trough can be filled with a material with good thermal properties or left unfilled (air-filled).

Unfilled troughs:

The unfilled troughs module offers four approaches for finding ampacity in unfilled (air-filled) troughs: the IEC standard, Slaninka Method 1, Slaninka Method 2 and the Anders Coates method. These approaches are based on field research conducted by independent parties and published in scientific journals. Depending on the selected method, users can enable additional factors that might influence the thermal behavior of the installation, such as the native soil thermal resistivity, the trough's cover material and the wind velocity over the trough.

Highlighted features:

  • Computes the air temperature inside the trough according to the IEC Standard 60287-2-1. 
  • Supports configurations included in the IEC Standard 60287-2-2 (group of cables in the air). 
  • Assumes the trough cover to be flush with the surface and allows users to choose whether the trough is exposed to sun radiation or shaded. 
  • Supports single, three-core or pipe-type cables. 
  • Supports introducing cables in ducts.
cables-in-unfilled-troughs.jpg
Cables in unfilled troughs

Filled troughs:

Filled troughs are supported by the multiple duct banks and backfills module. The ampacity (or operating temperature) is computed using the IEC standardized method, except for the external thermal resistance T4, which requires a finite elements approach. 

Highlighted features: 

  • Computes the temperature and steady-state unequally loaded ampacity
  • Offers extended capabilities to edit troughs and model asymmetrical installations easily
  • Allows performing cyclic loading rating through load factors
  • Enables placing multiple filled troughs or other additional layers (backfills, duct banks, etc.) within the same installation

Ready to learn more about these modules?

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cables-in-filled-troughs.jpg
Cables in filled troughs

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