Study on Combination Scheme of Cable Laying and Fire Prevention Measures in High Voltage Cable Trench

With the rapid development of power construction, the number of substations is increasing, the application of cable trench is more and more widely, and the fire safety of cable trench has been paid attention to. For exploring the influence of cable laying mode on cable fire spread in cable trench, eight kinds of combined scheme models of cable trench fire prevention were established. From three aspects of cable arrangement mode, cable layer spacing, and relative position of cable and fire barrier, the variation laws of temperature and gas concentration in cable trench with time after fire in different combination schemes were compared and analyzed to select the cable laying and fire prevention methods that were conducive to the safe operation of the cable trench. The research results show that the scheme of parallel arrangement and five layers arrangement of cables and laying the fireproof partition under the cable is conducive to reducing the loss of cable trench fire and restraining the spread of cable fire.