Create a good operating environment to avoid accelerated aging and damage of cable insulation

Power cables are an important component for maintaining the normal operation of power plants and substations. The widespread distribution of cables in power plants and substations, the flammability of cables, the ductility of cable fires, and the severity of the consequences of cable fires have made cable work highly valued by power departments, fire protection agencies, and institutions. Given the high incidence of cable fire accidents, further exploration is needed on fire protection measures for cables.

Create a good operating environment to avoid accelerated aging and damage to cable insulation. Cable trenches and tunnels should have good drainage facilities, such as shallow drainage ditches and collection wells, and be able to drain water. Automatic start stop pumping devices should be installed to prevent water accumulation and keep the interior dry.

The longitudinal drainage slope value of cable trenches and tunnels should not be less than 1% to 2%, and should be at least greater than 0.5% to prevent water, corrosive gases or liquids, and flammable liquids or gases from entering. Cable trenches and cable tunnels. Cable tunnels should be naturally ventilated, but when the normal load of cables causes the air temperature inside the tunnel to be higher than 40 ℃~50 ℃, a combination of natural exhaust and mechanical exhaust can be used for ventilation. The fan of the ventilation system should be interlocked with the fire detector, so that it can automatically stop supplying air when a fire occurs in the tunnel. Cable tunnels should not be used as the inlet duct of the ventilation system.

Practices that affect cable ventilation and heat dissipation, such as keeping the cable door in a normally closed state, using partitions to seal cables, and filling and sealing all gaps in cable trench covers, should be avoided. Moreover, enclosing the cable also makes it impossible to conduct normal inspections of the cable, preventing timely detection of cable faults.