Power distribution system having substantially zero electromagnetic field radiation

• US 5,616,969 A
• Filed: 07/11/1995
• Issued: 04/01/1997
• Est. Priority Date: 07/11/1995
• Status: Expired due to Fees

• Current Assignee: Irena Morava
• Original Assignee: Irena Morava
• Inventors: Morava, Irena
• Primary Examiner(s): Elms, Richard T.
• Application Number:
  US08/501,147
• Time in Patent Office: 630 Days
• Field of Search: 307/89-91, 307/104, 361/107, 333/12, 333/177, 174/32-34, 174/36, 174/40 R, 174/43, 174/35 R, 174/35 MS
• US Class Current: 307/91
• CPC Class Codes: H02G 7/20 Spatial arrangements or dispositions of lines or cables on poles, posts or towers
• CPC Class Codes: H02J 3/01 Arrangements for reducing harmonics or ripples
• CPC Class Codes: H02M 1/44 Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
• CPC Class Codes: Y02E 40/40 Arrangements for reducing harmonics

Abstract

Coaxially sheathed single core conductors are employed in this power distribution system. A current of equal magnitude and opposite in direction to that flowing in each core conductor is fed back through the coaxial sheath of that conductor so as to create a neutralizing magnetic field generated by the current flowing through each core conductor to result in substantially no magnetic field emitting from the distribution lines. It also reduces line reactance to provide more even current distribution of the current amongst the parallel conductors.

Claims

1. A method of substantially eliminating electromagnetic field radiation in an electrical power distribution system having power lines extending over a long distance between an electrical voltage source and a remotely located electrical load, comprising

supplying the voltage from said voltage source to said load with single core coaxial cable members having a main conductor surrounded with an electrically conductive sheath means which is electrically insulated from the main conductor whereby by a main current flows in said main conductor to said load,

supplying a supplementary current to said sheath means, said supplementary current being equal in magnitude and flowing in the opposite direction of said main current, and said supplementary current being provided by an external current source connected to said sheath means.

2. A method according to claim 1 wherein said supplementary current is provided by current transformer means connected to said main conductor of said cable members.

3. A method of substantially eliminating electromagnetic field radiation from an electrical power distribution system having plurality of power lines extending over along distance between a multi-phase electrical voltage source and a remotely located multi-phase electrical load, comprising

connecting each phase of said voltage source to an associated phase of said load with a coaxial cable member, said cable member having a central electrically conductive core member surrounded with an electrically conductive outer sheath means, wherein said core member and said outer sheath means are electrically insulated from one another over their entire length,

supplying said voltage to said load by said central electrically conductive core member whereby a main current in each phase flows in one direction to said associated phase of said load,

supplying a supplementary current in each phase by said sheath means connected to said phase, said supplementary current being equal in magnitude and flowing the opposite direction to said one direction of a said main current in each phase, and wherein said supplementary current is supplied from a multi-phase control current source connected to said sheath means.

4. A substantially zero electromagnetic radiation electrical power distribution system having an electrical power source and a remotely located electrical load means, comprising

coaxial cable means connecting between said power source and said load means, said cable means including a central electrical conductor member operative for conducting a main current in one direction to said load means, and an electrical conductive sheath means covering over the entire length of said central electrical conductor member,

electrical insulation means disposed between said central electrical conductor member and said sheath means,

current generating means connected to said conductive sheath means and operative to cause a supplementary current to flow in said sheath means, and said supplementary current flowing in a direction opposite to said one direction of said main current.

5. An electrical power distribution system according to claim 4 wherein said current generating means is a feedback means connected to said load means and said sheath means and operative to direct said supplementary current equal in magnitude and flowing in opposite direction of said main current.

6. An electrical power distribution system according to claim 4 wherein said current generating means is an external current generating means disposed at said load means and operative to inject said supplementary current equal in magnitude and flowing in the opposite direction of said main current in said sheath means.

7. An electrical power distribution system according to claim 4 including current transformer means coupled to said central electrical conductor members and said sheath means of said cable means and operative to generate said supplementary current to flow in said sheath means.

8. An electrical power distribution system according to claim 7 including capacitance means connected in series with said current transformer means.