- The fault of the cable itself causes a fire
There are two reasons for the failure and fire of the cable itself. One is that many cables have been soaked in water-logged cable tunnels and cable trenches for a long time. The layer was exposed for too long, resulting in an explosion in operation.
2. External factors lead to fire
The cover plate of the cable trench is not tight, and the sparks of electric welding slag fall into the trench, causing the cable to catch fire; the coal powder accumulates on the cable row, and it is close to the high-temperature pipeline, and the coal powder spontaneously ignites, causing the cable to catch fire; the oil-soaked electrical equipment fails to spray oil and catch fire, and the oil flows into the cable tunnel The oil leakage of the steam turbine oil system is sprayed onto the high-temperature hot pipe to catch fire, igniting the cables around it; the explosion-proof door of the pulverizing system is blasted, and the sprayed flames make the surrounding cables catch fire; the hot ash of the boiler is sprayed out. , Touched the surrounding cables and ignited the fire.
2. Characteristics of cable fires in thermal power plants
1. The fire is fierce. The cables of thermal power plants are mostly laid densely in tunnels and overhead. The cables are placed in an environment where high-temperature pipes are overlapped or staggered. Swift.
2. There is a “secondary disaster”. The cable catches fire and produces a large amount of toxic gas, which directly causes a “primary disaster” to the human body. At the same time, the gas in the combustion product combines with water to form a strong acid mist, which is attached to the electrical device, seriously reducing equipment and wiring circuits. Dielectric strength, resulting in “secondary disaster”.
3. Serious losses. “Secondary disaster” can easily lead to failure of the control circuit, which will expand the accident and cause serious losses.
