Abstract:

Considering factors such as the management, heat dissipation and fire safety of centralized cable laying, cable interlayers are installed in the design of substations in petrochemical plants. Cables laid in cable interlayers generate heat when they are energized. Over high internal temperature of cable interlayers will cause damage to the insulation of the cables and related equipment. To obtain a more accurate calculation of the heat loss generated by the cables in cable interlayers and avoid the increase in cost caused by adding a large number of HVAC loads in cable interlayers, multiple methods are adopted in the design to calculate the heat loss of the cable interlayers, providing a basis for the calculation of heat generation in the cable interlayers of substations. This paper, taking a substation in a petrochemical plant project as an actual case, proposes a calculation formula for the heat generation in cable interlayers, aiming to ensure the safe operation of equipment while achieving energy conservation and environmental protection.

Key words: cable interlayer, calculation of heat generation of cables, heat loss