: It ensures cables operate safely without overheating, considering factors like burial depth, soil type, and cable construction.
However, a critical vulnerability known across engineering circles as the —the structural degradation, thermal fracturing, and localized cross-linked polyethylene (XLPE) splitting caused by continuous high-temperature operation—poses a major threat to grid reliability. Failing to accurately model these thermal stresses can result in insulation failure, massive financial losses, and widespread power outages. What is a Thermal "Hot Crack"?
A generic calculation assumes uniform current distribution. CymCap models the specific geometry of the grid. It identifies "hot spots" —sections of the grid where current density is highest due to proximity to fault sources or low-impedance return paths.
In the context of underground cable installations, a "hot crack" refers to , where the surrounding soil's moisture migrates away from the cable due to high temperature, creating a dry, brittle pocket. cymcap hot crack
: Polymer insulation can become brittle or "crack" over time due to accelerated thermal aging. Soil Dry-Out
: Burial depth, native soil thermal resistivity, and ambient earth temperature.
If the soil dries out completely, its thermal resistivity ( ) can spike drastically—sometimes tripling in value. : It ensures cables operate safely without overheating,
: Preventing "hot spots" or overheating through steady-state and transient simulations.
When an underground power cable operates under high load, it generates heat.
Using CYMCAP to determine the optimal distance between cables to reduce mutual heating. What is a Thermal "Hot Crack"
In metallurgy and materials science, a hot crack is a type of defect that occurs in metals during their solidification process, particularly in welding or casting. Hot cracks form at high temperatures, usually just below the solidus temperature of the metal, due to the presence of liquid films at grain boundaries. These cracks can significantly affect the mechanical properties and structural integrity of the material.
While CYMCAP remains a global market leader, firms frequently audit its accuracy against alternative suites like ELEK Cable HV. The following matrix illustrates how thermal and structural risk parameters are evaluated across standard software packages: CYMCAP power cable ampacity software - Eaton
Standard two-dimensional calculations assume that soil conditions remain perfectly uniform across a long cable route. Real-world conditions are rarely that forgiving. Recognizing this, the CYMCAP Module Reference Guide details several specialized add-ons explicitly designed to mitigate high-temperature anomalies: Multiple Duct Banks and Backfills (MDB)
Calculating thermal loads on cables in J-tubes. Best Practices to Mitigate "Hot Cracks"
By taking a proactive approach to addressing Cymcap hot cracks, operators and engineers can ensure the safe, efficient, and reliable operation of their plants, minimizing downtime, costs, and environmental impact.