Cable Thermal Analysis
Cable Thermal Analysis
Cable Thermal Analysis Key Features
- Cable Steady-State Temperature Calculation using:
- Neher-McGrath Method
- IEC 60287 Method
- Cable Transient Temperature Calculation
- Cable Ampacity Calculation using:
- Cable Sizing -Thermal Analysis
- Underground (UG) Cable Raceway Rule Book
- Electromagnetic Field Intensity Evaluation
Cable Thermal Analysis Capabilites
- Printable cable, conduit and raceway layout.
- Printable dimension indication for conduits and raceways
- Graphical manipulation of raceways, cables, conduits, etc.
- Drag & drop cables from one-line diagrams
- Cables of different sizes in the same raceway
- Separate phases into different conduits or locations
- Unsymmetrical positioning of raceways
- Transient calculations use a dynamic thermal circuit model
- Option to fix cable size and/or loading
- Grounded/ungrounded metallic layer
- Calculate thermal resistance, dielectric losses, conductor loss factor, metallic layer loss factor
- User-defined cable physical structure
- Unbalanced load factors
- Multiple duct banks & direct-buried conduits
- Place raceways in multiple cross-sections
User-Defined Cable Physical Structure
ETAP cable thermal analysis module can model single core and multiple core cable physical structure in details. Various cable thermal and metallic layer types and corresponding dimensions can be defined individually based on actual cable construction.
- Insulation
- Filler
- Grounded/ungrounded metallic screen
- Grounded/ungrounded metallic armor
- Bedding
- Grounded/ungrounded metallic sheath
- Jacket
Flexible Operation
- Multiple raceways
- Multiple external heat sources
- Optimization of new cables in existing raceways
- Cross-sectional analysis
- Duct banks & direct buried raceways
- Integrated with cables in one-line diagrams
- Integrated with load flow results
- Integrated with cable pulling analysis
Plotting & Reporting
With the advanced web-based plot tools, the cable transient temperature plot can be generated and customized according to engineers’ requirement.
- Interactively view and zoom the transient temperature plot to any detail levels
- Option to combine and compare multiple transient temperature plots from different scenarios
- Report all physical and calculated data into multiple file formats
Interactive User Interface
The enhanced interactive interface helps engineers to design and draw the raceway fast and intuitively. With the snapping guideline, conduits and raceways can be precisely located by dragging without entering the coordinates. Automatic dimension labeling expedites the generation of the raceway layouts without additional editing and annotating.
- Display multiple cables, conduits, and raceways in the same presentation
- Option to display raceway dimensions
- Option to display Edge to Edge and Center to Center distance between conduits.
- Flag critical & marginal cable temperatures
- Snapping guideline between Centers, Tops, and Bottoms
The cable capacity / ampacity calculation and cable sizing are based on the NEC accepted Neher-McGrath method and IEC 60287 standard for steady-state temperature calculation. The transient temperature calculation is based on a dynamic thermal circuit model. All of these calculations can handle multi-raceway systems and consider the effect of heat generated by neighboring cables and external heat sources.
| Standards / Method | Title |
| Neher-McGrath | The Calculation of the Temperature Rise and Load Capability of Cable Systems |
| IEC 60287-1-1 Ed. 1.2 b:2001 | Electric cables - Calculation of the current rating - Part 1-1: Current rating equations (100% load factor) and calculation of losses - General |
| IEC 60287-2-1:2015 | Electric cables - Calculation of the current rating - Part 2-1: Thermal resistance - Calculation of thermal resistance |
| IEC 60287-3-1 Ed. 1.1 b:1999 | Electric cables - Calculation of the current rating - Part 3-1: Sections on operating conditions - Reference operating conditions and selection of cable type |
| IEC 60287-3-1 Amd.1 Ed. 1.0 b:1999 | Amendment 1 |
Videos
How to design, analyze, and optimize Underground Raceway Systems with ETAP
Learn how to determine optimal cable sizes, physical attributes, and maximum ampacity using ETAP’s Underground Raceway System module, ensuring that cables in duct banks or directly buried are operating within their maximum potential capacity.
In addition, transient temperature analysis computes temperature profiles for cable currents, reducing the risk of damage to cable systems under emergency conditions. All cable steady-state temperature calculations are based on the Neher-McGrath Method
and the IEC 60287 Standard.
Cable Thermal Analysis for Underground Raceways
Learn how to save design time using the Raceway Rulebook to auto-layout cables within duct banks. Find out how to determine the optimal cable sizes, physical attributes, and maximum derated ampacity using Neher-McGrath method and IEC 287 standard.
Cable Ampacity & Sizing
Proper sizing and current derating ensures that cables operate to their maximum potential while providing secure and reliable operation. Learn about design and application requirements to properly size and analyze cable systems based on IEEE and North American cable standards and guidelines: IEEE 399, ICEA P-54-440, NEC NFPA 70
Cable Ampacity, Sizing & Shock Protection - Part II
Proper sizing and current de-rating ensures that cables operate to their maximum potential while providing secure and reliable operation. This webinar covers cable sizing, current carrying capacity and electrical shock protection based on IEC and British standards.
Cable Thermal Analysis - Part III
This Cable Thermal Analysis webinar explains how to design cable systems to operate to their maximum potential while providing a secure and reliable operation.
Literature
Underground Raceway Systems
Underground Raceway Systems helps engineers to design cable systems to operate to their maximum potential while providing secure and reliable operation.
Cable Magnetic Field Evalution Calculation
The magnetic field exposure analysis tool uses balanced & unbalanced load-flow currents and angles to determine the location of the worst-case magnetic field exposure due to conductors in underground raceways.
White Papers
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