Large power cable diameter.
It is difficult to transport and lay power cables.
Power cables also have strict requirements on the turning radius.
Power cable in the construction, if the power cable turning Angle is too large, may make the conductor is internal mechanical damage, and the mechanical damage by power cable insulation cover to see, even if the measuring loop resistance, insulation and leak test is difficult to find defects, runtime overheating in damaged place make cable insulation strength to drop, until a failure.
Most of the reasons for the failure of power cable heads are that the length of the three cable heads is the same during the production of cable heads. When connecting with the equipment, due to the limitation of the terrain, the medium phase cable heads are too long and become arched, and the root of the cable head is damaged and discharged.
Finally, some measures are taken to shorten the connecting length of the middle phase cable head according to the connection of different equipment, so that the three-phase cable head will not be subjected to external force. The practice proves that the operation effect is good.
Thus, in the process of power cable construction, it is necessary to reduce the torque of the cable as much as possible. When the power cable turns and leaves the cable, the cable is in a natural bending and the internal mechanical damage is eliminated.