Due to the large outer diameter of the power cable, transportation and laying are difficult, and the power cable has strict requirements on the turning radius.
During the construction of the power cable, if the turning angle is too large, the inside of the conductor may be mechanically damaged, and the mechanical damage may not be seen due to the cover of the cable insulation.
Even if the loop resistance is measured, it is difficult to find the defect by the insulation and leakage test.
When it is overheated at the damaged location, the insulation strength of the cable is reduced until a fault occurs.
Zhengzhou Cable found that the cable head failure occurred several times.
When the cable head was made, the lengths of the three cable heads were the same.
When connected with the equipment, due to the terrain limitation, the middle phase cable head became long and arched, and the root of the cable head was damaged and discharged.
After taking measures, according to the connection of different equipment, the length of the connection of the middle phase cable head is appropriately shortened, so that the three-phase cable head is free from an external force, and the operation effect is proved to be good.
It can be seen that during the cable construction process, the torque received by the cable should be reduced as much as possible.
When the cable turns and the cable is left, the cable is naturally bent, and the Zhengzhou cable factory eliminates internal mechanical damage.
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