T&D World Magazine

Real-time Temperature Rating Extends Monitoring Functionality

Numerous underground transmission projects are emerging worldwide. Each project requires a substantial investment of time and money in a market where shortfalls and blackouts are not acceptable anymore.

It is a universal practice to use Distributed Temperature Sensing (DTS) systems based on fiber optictechnology to monitor the cables temperature all over the run. To supplement this technology, CYME has introduced its CYMCAP/RTTR Dynamic or Real Time Temperature cable Rating system to extend the monitoring functionality and predict/forecast the behavior of the installation under emergency situations.

CYMCAP/RTTR is designed to provide both steady state and transient thermal analysis. It is based on the IEC Standards 60287 and/or 60853 or finite elements. This function allows the user to be ready, by looking into the future, when an emergency situation arises.

</ align="left" /> RTTR Operating Modes

The Real-time Temperature Rating based on CYMCAP has two modes of operation:

  • Estimating the conductor temperature from the fiber measured temperature.
  • Performing emergency ratings with the transient engine

CYMCAP/RTTR Modeling Capabilities

Virtually every cable construction available in the market can be modeled with CYMCAP: one-core, three-core, sheathed cables, concentric neutrals, armored cables, screens, shields, beddings, servings, jackets, etc. The following installation types can be modeled: duct banks, backfills, directly buried, buried ducts, buried pipes, cables in air (including groups of cables and riser poles) and cables in tunnels. Unique to CYMCAP is its ability to model several materials with different thermal resistivities, for example: stratified soil layers, multiple duct banks and multiple backfills.

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