| 摘要 |
At least one of the coil (4, 5) is at least partially formed by a cable (9) comprising a flexible electric conductor (10) with a sheath (11) capable of keeping in the electrical field generated around the conductor. The cores can be connected to one or more phases in a single or multi-phase alternating voltage or a conductor in a direct voltage supply. In the case of alternating voltage, at least two coils are connected to the same phase so that they register the same magnetic flow, which is separate from the magnetic flow registered by any coils connected to other phases, and in the case of direct voltage at least two coils are connected to the voltage supply so that they register the same magnetic flow. |
