means that there is only one conductor in an insulating layer. When the voltage exceeds 35kV, most of the single-core cables are used. The relationship between the core and the metal shielding layer can be regarded as the relationship between the coil and the iron core in the primary winding of a transformer. When the single-core cable core
passes current, there will be magnetic lines of flux interlinked aluminum-clad or metal shielding layer, causing induced voltage at both ends of it.
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