Briefly analyze the 5 causes of high-voltage cable failure

The fire caused by cable failure is fierce and spreads rapidly, and a large number of harmful gases occur when burning, causing difficulties
in fighting the fire.
After the cable burns out, the repair time is long and the loss is serious, so great attention must be paid to preventing cable fire accidents
.
Here are 5 causes of high-voltage cable failure:

1.
The site conditions are relatively poor, the environment and process requirements of cables and joints are very high when manufactured in the factory, and the temperature, humidity and dust of the construction site are not easy to control
.

2.
The installation is not strictly in accordance with the process construction or process regulations, and the possible problems
are not considered.
The completion acceptance adopts DC withstand voltage test, which causes the formation of reverse electric field in the joint, resulting in insulation damage
.

3.
Caused
by poor sealing treatment.
The intermediate joint must adopt a metal copper shell plus PE or PVC insulation anti-corrosion layer sealing structure to ensure the dense seal in the on-site construction, which effectively ensures the sealing and waterproof performance
of the joint.

4.
During the cable construction process, fine slip marks will inevitably be left on the insulation surface, semi-conductive particles and sand particles on the emery cloth may also be embedded in the insulation, and the joint construction process due to the insulation exposure to the air, the insulation will also absorb moisture, which leave hidden dangers
for long-term safe operation.

5.
The cable material itself and the inevitable defects in the process of cable manufacturing, laying, terminal production, etc.
, affected by the electric heating, chemical, environmental and other factors in operation, the insulation of the cable will undergo different degrees of aging, and this aging will eventually lead to the occurrence
of cable failure.