| 摘要 |
The present invention relates to a method and a device for actively damping the power-frequency magnetic fields which occur in the vicinity of, for example, small-sized transformer, network and distribution substations. This is performed by generating a field directed opposite to the unwanted magnetic field from the electric equipment in the station. This is achieved, for example, by disposing a compensating coil (8) along the walls of the station. A magnetic-field-sensing probe (6) is placed below the roof of the station in such a way that it covers an area where the amplitude of the magnetic field is as close to the mean field over the whole roof as possible. The magnetic-field-sensing probe is then connected to a current amplifier (9) which, in turn, feeds the compensating coil such that the amplitude of the field at the probe is considerably reduced. |
