Transformer system for measuring electrical current
First Claim
1. A transformer system for measuring electrical current comprising:
- an electrical conductor having first and second conductor portions, said first conductor portion conducting an electrical current in one direction and said second conductor portion conducting the electrical current in an opposite direction;
said first conductor portion producing a magnetic field Ha and said second conductor portion producing a magnetic field Hb ;
a flat coil having a non-ferromagnetic core;
said coil having an axis and an axis and an outer circumferential surface;
said coil being positioned between said first and second conductor portions so that the axis of said coil is substantially parallel to said magnetic fields Ha and Hb ;
the separation between the outer circumferential surface of said coil and said first and second conductor portions being the minimum distance for maximizing the magnetic coupling between said conductor portions and said coil while avoiding voltage breakdown for a predetermined electrical current in said conductor portions; and
at least one ferromagnetic shield surrounding said first and second conductor portions for shielding said coil from external magnetic fields,said ferromagnetic shield being fabricated from sheet metal in the form of a cylinder electrically insulated from said first and second conductor portions,the length of said cylinder being greater than the largest dimension of the open ends of said cylinder, anda housing made from an electrically insulating material around said coil, said housing having walls which electrically insulate said coil from said first and second conductor portions,said housing including a bottom portion which comprises a carrier for said coil.
1 Assignment
0 Petitions
Accused Products
Abstract
A transformer system for measuring electrical current includes an electrical conductor having first and second conductor portions. The first conductor portion conducts electrical current in one direction and the second conductor portion conducts the electrical current in an opposite direction. The first conductor portion produces a magnetic field Ha and the second conductor portion produces a magnetic field Hb. A coil having a non-ferromagnetic core is positioned between the first and second conductor portions so that the axis of the coil is substantially parallel to the magnetic fields Ha and Hb. The separation between the outer circumferential surface of the coil and the first and second conductor portions is the minimum distance for avoiding a voltage breakdown therebetween for a predetermined maximum electrical current in the conductor portions. At least one ferromagnetic shield surrounds the first and second conductor portions for shielding the coil from external magnetic fields.
-
Citations
19 Claims
-
1. A transformer system for measuring electrical current comprising:
-
an electrical conductor having first and second conductor portions, said first conductor portion conducting an electrical current in one direction and said second conductor portion conducting the electrical current in an opposite direction; said first conductor portion producing a magnetic field Ha and said second conductor portion producing a magnetic field Hb ; a flat coil having a non-ferromagnetic core;
said coil having an axis and an axis and an outer circumferential surface;said coil being positioned between said first and second conductor portions so that the axis of said coil is substantially parallel to said magnetic fields Ha and Hb ; the separation between the outer circumferential surface of said coil and said first and second conductor portions being the minimum distance for maximizing the magnetic coupling between said conductor portions and said coil while avoiding voltage breakdown for a predetermined electrical current in said conductor portions; and at least one ferromagnetic shield surrounding said first and second conductor portions for shielding said coil from external magnetic fields, said ferromagnetic shield being fabricated from sheet metal in the form of a cylinder electrically insulated from said first and second conductor portions, the length of said cylinder being greater than the largest dimension of the open ends of said cylinder, and a housing made from an electrically insulating material around said coil, said housing having walls which electrically insulate said coil from said first and second conductor portions, said housing including a bottom portion which comprises a carrier for said coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
Specification