Software modules

Cable thermal rating module

Eaton’s CYME cable thermal rating module software, part of the Brightlayer Utilities suite, enables steady state and transient thermal capacity evaluation of underground duct bank structures.

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Eaton's CYME cable thermal rating module utilizes the CYMCAP software calculation engine to precisely simulate, determine ampacity and temperature rise for power cable installations. Utilities can take advantage of steady state, cyclic and transient* thermal simulations to identify possible risks or prevent premature cable damage produced by overheating, and validate if cables have been exposed over the maximum operating conditions given historical or forecasted demand profiles.

Users can easily create 'what-if'** scenarios to enable the inclusion of duct bank installations in longterm planning activities as well as find the optimal parameters of actual or planned installations (cable size, materials, depth, introduce duct filler, distance between cables, etc.) and maximize the benefits of the cable installation investment.

*Transient simulations require Load Flow with Profiles add-on module.

**It can also be integrated with the Advanced Project Manager add-on module to evaluate thermal impact of planning modifications as new loads or generation.

Expanded power system analysis model with underground cable installation cross-sectional representation
Utilized load flow analysis (snapshot or time-series) as input data
Improved modeling of cable circuits in congested urban areas for equivalent impedance calculations
Numerous locations capability for cable thermal analysis and identifying abnormal rating conditions

Enhanced system design and planning capability for strategic CapEx decisions
Increased simulation reporting and charting capabilities
Extensive database storage of typical duct banks configurations and cables

Cable installation modeling

Cable

The cable modeling module features several layers required for ampacity calculations: conductor shield, insulation, screen, metallic sheath, fillers, jacket around each core, armor bedding, armor serving, jacket, among others.

Some of these layers and associated data are optional since they are not required for the cable circuit equivalent impedance calculation.

CYME libraries of metallic and non-metallic materials support an extensive range of cable constructions and types providing thermal ratings calculations for each.

Duct bank

Enables standard and non-standard duct bank configuration library utilized on the network model to accurately represent underground cable installations
Captures the construction details of the structure, such as the number of ducts, the duct dimensions and clearances between and around individual ducts

Installations

The underground cable installation modeling module has significant capabilities. It can utilize the geometric arrangement of an individual cable pertaining to a given circuit or include the duct bank structure to a single section with one circuit and several cables or multiple sections associated with different circuits, providing the user with extensive flexibility.

Cable positioning is based on the duct bank structure allowing the automatic determination of the X,Y coordinates of each cable. Cables can easily be assigned to a given duct, or moved to another duct, to create an accurate representation of the actual cable arrangement in the field.

Cable thermal capacity

Addresses steady-state and transient thermal cable rating as per the analytical techniques described by Neher-McGrath and the International Standards IEC 60287 and IEC 60853.

Steady State Analysis

Using thermal models for each individual cable and for the overall installation, the steady state analysis provides the following results:
- Ampacity of each cable circuit installed in a duct bank as a function of the conductor’s maximum operating temperature
- Operating temperature of each cable in a duct bank as a function of the conductor current. The latter can be input by the user as a simulation parameter or can be obtained automatically from a load flow simulation
A series of reports that complies to the IEC standard 60287 is also available to inform the user on the several electrical and thermal quantities that are calculated to determine the cables’ ampacity or operating temperature:
- Steady state summary
- Electrical parameters

Transient Analysis

When combining a time-varying conductor current profile with the thermal model of a given underground cable installation, the transient analysis performs a timedomain thermal analysis that provides the following results:
- Ampacity of each cable circuit installed in a duct bank as a function of time and conductor’s maximum operating temperature, given the time-varying current profile (envelope)
- Operating temperature of each cable in a duct bank as a function of time and conductor current profile

Several reports and charts are available at the completion of the simulation:

Charts
- Conductor temperature vs. time and conductor current vs. time
Reports
- Transient ampacity summary
- Abnormal conditions summary/detailed: Provides different KPI’s on conductor over-heating periods, such as maximum temperature, duration and date/time of occurrence
- Cable and duct bank detailed: Similar to the abnormal conditions report, but contextual to each cable circuit and duct bank included in the simulation

Eaton’s CYME cable thermal rating module utilizes the CYMCAP software calculation engine to precisely simulate, determine ampacity and temperature rise for power cable installations.

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Need product support?

CYME users portal: my.cyme.com

P: 450-461-3655 or 800-361-3627 (Canada and US)

E: cymesupport@eaton.com

Questions before you buy

E: cymeinfo@eaton.com

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