Sensor, method and system of monitoring transmission lines
First Claim
1. An apparatus that measures the three dimensional phase and magnitude of the magnetic field emanating from overhead transmission and distribution phase conductors, comprising:
- at least one magnetic field sensor positioned remotely from the phase conductor, said sensor comprising;
at least a pair of conductive windings having opposite polarity from a common ground, said opposite polarity windings canceling the electric field signal on said windings and generating an open circuit voltage between the ungrounded ends of each winding; and
a cylindrical bobbin, wherein said windings are separately turned about respective side-by-side cross sectional thicknesses of said bobbin.
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Accused Products
Abstract
An apparatus, method, and system for measuring the magnetic field produced by phase conductors in multi-phase power lines. The magnetic field measurements are used to determine the current load on the conductors. The magnetic fields are sensed by coils placed sufficiently proximate the lines to measure the voltage induced in the coils by the field without touching the lines. The x and y components of the magnetic fields are used to calculate the conductor sag, and then the sag data, along with the field strength data, can be used to calculate the current load on the line and the phase of the current. The sag calculations of this invention are independent of line voltage and line current measurements. The system applies a computerized fitter routine to measured and sampled voltages on the coils to accurately determine the values of parameters associated with the overhead phase conductors.
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Citations
27 Claims
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1. An apparatus that measures the three dimensional phase and magnitude of the magnetic field emanating from overhead transmission and distribution phase conductors, comprising:
at least one magnetic field sensor positioned remotely from the phase conductor, said sensor comprising; at least a pair of conductive windings having opposite polarity from a common ground, said opposite polarity windings canceling the electric field signal on said windings and generating an open circuit voltage between the ungrounded ends of each winding; and a cylindrical bobbin, wherein said windings are separately turned about respective side-by-side cross sectional thicknesses of said bobbin. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus that measures the phase and magnitude of the magnetic field emanating from overhead transmission and distribution phase conductors, comprising:
at least one pair of magnetic field sensors positioned remotely from a phase conductor, wherein said pair of magnetic field sensors is positioned orthogonally without intersecting so as to sense the X and Y components of the magnetic field produced by the phase conductor, and wherein each of said sensors comprises at least a pair of conductive windings having opposite polarity from a common ground, said opposite polarity windings canceling the electric field signal on said windings and generating an open circuit voltage between the ungrounded ends of each winding. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An apparatus that measures the phase and magnitude of the magnetic field emanating from overhead transmission and distribution phase conductors, comprising:
at least one magnetic field sensor for positioning remotely from a phase conductor, said sensor comprising at least a pair of conductive windings having opposite polarity from a common ground, said opposite polarity windings substantially canceling the electric field signal on said windings and generating an open circuit voltage between the ungrounded ends of each winding, wherein said sensor is positioned sufficiently proximate to the phase conductor such that said open circuit voltage between windings is at least 100 millivolt AC. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
Specification