Power cables in the construction, there is a steel bracket, there is with steel protection tube, there is the use of the card and the overhead cable laying, all in the vicinity of power cables formed steel (iron) of a closed loop, it is likely to form a vortex, especially in the large-current power cable system, a greater vortex.
There was a certain place about 0.4km IN 10 kV overhead lines, using strand as overhead support, telecommunications cables with cable clamps fixed soon put into operation after a ground fault occurs, the check for the cable clamps with steel cable to form a closed eddy current loops, the cable from heat, burned insulation, causing a ground fault. The analysis test, in combination with steel cable after cable clamps at the isolation insulating layer (such as the stripped cable insulation sheath), no vortex phenomenon, after years of normal operation, similar failures occurred.
Thus, in the power cable construction, it must take measures to make around the cable can not be formed steel (iron) of a closed loop to prevent the cable from causing eddy currents to occur.
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