Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1987-03-16
1988-10-25
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
324 61P, G01R 2726
Patent
active
047806621
ABSTRACT:
Disclosed is a method of determining the eccentricity of the insulation on a round wire without making electrical contact with the wire. The insulated wire is passed between two pairs of opposing electrodes, pair A-C and pair B-D, positioned at a known distance from the insulated wire and spaced apart azimuthally at a known angle. Known, out of phase, alternating voltages are applied to each pair of electrodes. Signals are generated from the four electrodes that are proportional to (1) v.sub.A -v.sub.B +v.sub.C -v.sub.D and (2) -v.sub.A -v.sub.B +v.sub.C +v.sub.D, where v.sub.A, v.sub.B, v.sub.C, and v.sub.D are the voltages on electrodes A, B, C, and D, respectively. From those signals the eccentricity of the insulation on the wire can be determined by ##EQU1## where .vertline.q.vertline. is the magnitude of ##EQU2## The direction of the eccentricity can be determined from the difference in phase between the two signals. Also disclosed is an apparatus for determining the maximum ratio of insulation thickness on one side of a round insulated wire to the insulation thickness on the opposite side of the insulated wire. The apparatus comprises two pairs of opposing electrodes, pair A-C and pair B-D, spaced radially apart and positioned around the insulated wire, means for applying known, out of phase, alternating voltages from independent sources to each pair of electrodes, and means for generating signals from said electrodes that are proportional to (1) v.sub.A -v.sub.B +v.sub.C -v.sub.D and (2) -v.sub.A -v.sub.B +v.sub.C +v.sub.D.
REFERENCES:
patent: 2604512 (1952-07-01), Bacon et al.
patent: 3748577 (1973-07-01), Jones, Jr.
Bennett Allan I.
Westervelt Dean C.
Eisenzopf Reinhard J.
Mich, Jr. A.
Miele Anthony
Westinghouse Electric Corp.
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