Net current control device

In an electrical power system for a residential building, wherein a multi-conductor cable supplies power to loads in the residential building from a power supply, said cable having a neutral conductor providing a conductive path for currents returning from said loads to the power supply, wherein a net current may occur in said electrical system, said net current being an instantaneous sum of all the currents in said electrical system returning to the power supply via alternative conductive paths different than the neutral conductor, and wherein said net current creates a power frequency magnetic field in the vicinity of and inside of the residential building,

• the improvement in reducing said power frequency magnetic field, comprising a closed loop ferromagnetic core attached to said multi-conductor cable for increasing the impedance of said alternative conductive paths to the net current, thereby increasing the current flowing to the power supply via the neutral conductor.

In an electrical power system for a residential building, wherein a multi-conductor cable supplies power to loads in the residential building from a power supply, said cable having a neutral conductor providing a conductive path for currents returning from said loads to the power supply, wherein a net current may occur in said electrical system, said net current being an instantaneous sum of all the currents in said electrical system returning to the power supply via alternative conductive paths different than the neutral conductor, and wherein said net current creates a power frequency magnetic field in the vicinity of and inside of the residential building,

• the improvement in reducing said power frequency magnetic field, comprising a ferromagnetic core attached to said multi-conductor cable for increasing the impedance of said alternative conductive paths to the net current, thereby increasing the current flowing to the power supply via the neutral conductor,
• wherein an auxiliary winding is wound on the ferromagnetic core, the auxiliary winding having first and second terminals, respectively, and
• wherein at least first and second non-linear voltage dependent impedances are connected in parallel and in opposite polarity to each other, said at least first and second impedances being connected to said first and second terminals, respectively.

In an electrical power system for a building, wherein a multi-conductor cable supplies power to loads in the building from a power supply, said cable having a neutral conductor providing a conductive path for currents returning from said loads to the power supply, wherein a net current may occur in said electrical system, said net current being an instantaneous sum of all the currents in said electrical system returning to the power supply via alternative conductive paths different from the neutral conductor, and wherein said net current creates a power frequency magnetic field in the vicinity of and inside of the building, the method of reducing said power frequency magnetic field comprising the step of:

• attaching a closed loop ferromagnetic core along said multi-conductor cable for controlling said alternative conductive paths, thereby increasing the impedance of said alternative conductive paths of said building to the net current, and thereby increasing the current flowing along the neutral conductor.