1. High current power cables cause eddy current problems. Power cables in the construction, some use steel bracket, some use steel protection tube and some use strain relief clamp and overhead cable laying, all in the vicinity of power cables formed of steel (iron) of a closed loop, it is likely to form a vortex, especially in high current power cable system, the eddy current is greater. When the power cable laying construction, measures must be taken so that the cable can not be formed closed loop around the steel (iron), prevent power cable causing eddy current.

2. Mechanical damage problems caused by power cable bending. Due to the large diameter of power cable, transportation and laying is more difficult, the power cable to bending radius requirements is more stringent. When power cables is in laying construction, if the bending angle is too large, it may make the internal conductor subjected to mechanical damage, and cause mechanical damage cable insulation strength decline, until break downe. In Power cable construction process, we should minimize the torque cable suffered; when cable turning and obligate power cable, we should let the cable in a natural bent, prevent the power cable internal mechanical damage.

3. Power cable moistureproof problem. Operating experience shows that most of medium voltage power cable and low voltage power cable faults are occurred at the middle connector or terminal head of the cable, and the middle joints and terminations head failure is largely due to poor sealing, moisture intrusion caused dielectric strength decreased, while the medium voltage power cable and low voltage power cable net are usually use dendritic power supply, a larger number of cable terminal head. So to ensure that the cable head end and middle joints plugging seal is to ensure safe and reliable operation of the cable one of the important measures.