Power cables in the construction, there are steel stent, the use of steel protection tube. There are cable and overhead laying, all in the power cable around the formation of steel (iron) closed loop, are likely to form a vortex.
Especially in large current power cable systems, the eddy current is greater.
The power cable caused by the mechanical damage caused by the problem. As the power cable diameter larger, transport, laying more difficult, the power cable on the turning radius requirements are more stringent. In the equipment connection.
The appropriate shortening of the length of the cable head connection, so that three-phase cable head are not external force, proved to run well.
The operation experience shows that most of the failure of the middle and low voltage power cables is faulty for the middle and terminal of the cable, while the failure of the middle joint and the terminal head is mostly due to the bad seal, the intrusion of moisture caused by the decrease of the dielectric strength, and the low voltage power cable.
The use of dendritic power supply more than the number of cable terminals, so the cable head and the middle of the plug seal is to ensure the safe and reliable operation of the cable one of the important measures.
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