Balancing multiple transmission lines forming a single phase of an electrical power distribution system

Patent metadata

Field	Value
Publication number	US-10014103-B2
Application number	US-201514668556-A
Country	US
Kind code	B2
Filing date	Mar 25, 2015
Priority date	Mar 25, 2015
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

A device for passively balancing multiple transmission lines forming a single phase of a power distribution system may include a magnetic core in which a magnetic flux is generable and an opening through the magnetic core. The opening is configured for receiving multiple transmission lines that form a single phase of the power distribution system. A different amplitude of alternating current flowing in each of the transmission lines generates a magnetic field about each transmission lines that has a magnitude corresponding to the amplitude of the alternating current. The magnetic fields combine to form a unified magnetic field that is absorbed by the magnetic core and generates a magnetic flux in the core. An equal amplitude of alternating current is generated in each of the transmission lines for passively balancing the transmission lines in response to the magnetic flux collapsing in the magnetic core.

First claim

What is claimed is:

1. A device for passively balancing multiple transmission lines forming a single phase of an electrical power distribution system, the device comprising:
a magnetic core in which a magnetic flux is generable; and
an opening through the magnetic core, the opening being configured for receiving the multiple transmission lines that form the single phase of the electrical power distribution system, wherein a different amplitude of alternating current flowing in each of the multiple transmission lines generates a magnetic field about each of the multiple transmission lines that has a magnitude corresponding to the amplitude of the alternating current, the magnetic fields from the multiple transmission lines are absorbed by the magnetic core and generate a magnetic flux in the magnetic core, an equal amplitude of alternating current being generated in each of the multiple transmission lines for passively balancing the multiple transmission lines in response to the magnetic flux collapsing in the magnetic core.

2. The device of claim 1 , wherein the opening is configured for substantially an entirety of the magnetic fields from the multiple power transmission lines being absorbed by the magnetic core.

3. The device of claim 1 , wherein the opening comprises an elongated slot, the multiplicity of electrical power transmission lines being each disposed adjacent one another within the elongated slot.

4. The device of claim 3 , wherein the magnetic core comprises a predetermined width from a perimeter edge of the magnetic core to the elongated slot that is constant about a perimeter of the magnetic core.

5. The device of claim 4 , wherein the magnetic core comprises:
two opposite sides that are each parallel to longitudinal sides of the elongated slot between the two opposite sides; and
a semicircular end at each end of the magnetic core that joins the two opposite sides.

6. The device of claim 1 , wherein the magnetic core comprises a plurality of plates stacked directly on one another, each of the plurality of plates comprising a metallic material capable of generating a magnetic flux.

7. The device of claim 1 , wherein the magnetic core comprises one of a silicon steel alloy core and a nickel-iron alloy core.

8. The device of claim 1 , wherein a length of each of the multiple transmission lines is a predetermined number of miles.

9. The device of claim 1 , wherein the opening is sized to accommodate an exact number of transmission lines passing through the opening.

10. The device of claim 1 , wherein a number of the multiple transmission lines are between two transmission lines and six transmission lines and wherein the opening is sized to accommodate an exact number of transmission lines passing through the opening.

11. The device of claim 1 , further comprising:
a second magnetic core adjacent the magnetic core; and
a second opening through the second magnetic core, wherein the multiple transmission lines are looped through the openings of the magnetic core and the second magnetic core a predetermined number of passed for generating the equal amplitude of alternating current in each of the multiple transmission lines.

12. The device of claim 11 , wherein a distance traveled by the multiple transmission lines through the magnetic core and the second magnetic core and the predetermined number of passes defines a level of coupling of the magnetic flux between the magnetic cores and the alternating current in each of the multiple transmission lines.

13. A system for electrical power distribution, comprising:
a three-phase transformer that receives electrical power generated by a power generator;
a power distribution transformer;
a three-phase power line distribution system coupling the three-phase transformer to the power distribution transformer, each phase of the three-phase power line distribution system comprising multiple transmission lines; and
a device associated each phase of the three-phase power line distribution system for passively balancing the multiple transmission lines forming each phase.

14. The system of claim 13 , wherein the device comprises:
a magnetic core in which a magnetic flux is generable; and
an opening through the magnetic core, the opening being configured for receiving the multiple transmission lines that form a single phase of the electrical power distribution system, wherein a different amplitude of alternating current flowing in each of the multiple transmission lines generates a magnetic field about each of the multiple transmission lines that has a magnitude corresponding to the amplitude of the alternating current, the magnetic fields from the multiple transmission lines are absorbed by the magnetic core and generate a magnetic flux in the magnetic core, an equal amplitude of alternating current being generated in each of the multiple transmission lines for passively balancing the multiple transmission lines in response to the magnetic flux collapsing in the magnetic core.

15. The system of claim 14 , wherein the opening comprises an elongated slot, the multiplicity of electrical power transmission lines being each disposed adjacent one another within the elongated slot, and wherein the magnetic core comprises a predetermined width from a perimeter edge of the magnetic core to the elongated slot that is constant about a perimeter of the magnetic core.

16. The system of claim 14 , wherein the device further comprises:
a second magnetic core adjacent the magnetic core; and
a second opening through the second magnetic core, wherein the multiple transmission lines are looped through the openings of the magnetic core and the second magnetic core a predetermined number of passed for generating the equal amplitude of alternating current in each of the multiple transmission lines.

17. A method for passively balancing multiple transmission lines that form each phase of a three-phase electrical power distribution system, the method comprising:
providing a magnetic core in which a magnetic flux is generable for each phase;
fitting the multiple transmission lines of each phase in an opening through the magnetic core associated with each phase, wherein a different amplitude of alternating current flowing in each of the multiple transmission lines of a particular phase generates a magnetic field about each of the multiple transmission lines of the particular phase that has a magnitude corresponding to the amplitude of the alternating current, the magnetic fields from the multiple transmission lines are absorbed by the magnetic core of the particular phase and generate the magnetic flux in the magnetic core, an equal amplitude of alternating current being generated in each of the multiple transmission lines of the particular phase for passively balancing the multiple transmission lines of particular phase in response to the magnetic flux collapsing in the magnetic core.

18. The method of claim 17 , wherein fitting the multiple transmission lines of each phase in the opening comprises fitting the multiple transmission lines in an elongated slot, the multiplicity of electrical power transmission lines being each disposed adjacent one another within the elongated slot.

19. The method of claim 17 , wherein the magnetic core comprises a predetermined width from a perimeter edge of the magnetic core to the elongated slot that is constant about a perimeter of the magnetic core.

20. The method of claim 19 , wherein providing the magnetic core comprises:
providing the magnetic core i

Assignees

• Boeing Co

Inventors

• Peck Jr James L

Classifications

• H01F37/00

  Fixed inductances not covered by group H01F17/00 · CPC title

• H01F27/2823 Primary

  Wires (H01F27/2866 takes precedence) · CPC title

• H01F27/245 Primary

  made from sheets, e.g. grain-oriented (H01F27/26 takes precedence) · CPC title

• H01F3/02

  made from sheets · CPC title