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How to set soil thermal resistance in ETAP cable current carrying capacity calculation? The method of setting soil thermal resistance in ETAP cable current carrying capacity calculation is to directly input the corresponding thermal resistance coefficient value in the cable library or cable data editor based on the soil characteristics of the actual laying environment. 1. The importance of soil thermal resistance system is that soil thermal resistance is a key factor affecting cable heat dissipation, and its standard unit is K · m/W. This value directly affects the calculation of the cables current carrying capacity. The higher the thermal resistance, the worse the cables heat dissipation, and the lower the allowed current carrying capacity.
2. In the ETAP software, setting the soil thermal resistance is mainly achieved through the following path: * Navigate to the Cable Library. *Select or create the cable model that needs to be edited. *In the cable data editing interface, find the parameter column related to the laying conditions, usually named "Soil Thermal Resilience" or similar. *Fill in the measured or selected thermal resistance coefficient value in the corresponding input box directly or virtually. The value of the thermal resistance coefficient is not a fixed value based on soil thermal resistance and needs to be determined according to the actual engineering situation. The common reference ranges are as follows: | Soil type and condition | Thermal resistance coefficient range (K · m/W) | Remarks | |: ---: --- |: --- | | Very humid soil (such as clay) | 0.7-1.0 | Ideal heat dissipation conditions | | Wet soil (ordinary loam) | 1.0-1.5 | Common design values | Dry soil | 1.5-2.5 | Careful evaluation of
2. Calculation basis of CYMCAP software
The calculation basis of CYMCAP software is mainly based on the iterative techniques of Neher McGrath and IEC-287 methods, while following North American practices and supporting relevant IEC standards.
. Specifically, the Neher McGrath method is an iterative technique based on the Neher McGrath and IEC-287 methods. It is a classic method for calculating cable current carrying capacity, which comprehensively considers various factors of the cable, such as the geometric dimensions of the cable, the resistance of the conductor, the thermal resistance of the insulation material, and the temperature of the surrounding environment. Through a series of mathematical formulas and calculation steps, it can accurately calculate the current carrying capacity of the cable under specific conditions. The IEC-287 standard is also a widely recognized international standard for calculating cable current carrying capacity, which provides detailed specifications for various parameters and calculation methods of cables. The CYMCAP software combines these two methods and uses iterative techniques for calculations. Iter