EP0000954A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Methods of and apparatus for controlling capacitance unbalance-to-ground in cables
Assignee: AT&T Inc
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Filing: 1978-08-30
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Granted: —
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Expires: 1998-08-30
Abstract
Abstract Capacitance unbalance-to-ground between conductors of a twisted pair, each of which may be insulated with at least a layer of cellular plastic insulation, is maintained within acceptable limits by controlling the extrusion of the insulation to maintain the measured coaxial capacitance and associated outside diameter of the insulated conductors within a range of values which correspond to acceptable capacitance unbalance-to-ground values.
Inventors
- 👤 Timothy Stephen Dougherty
- 👤 William Malcolm Flegal
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 02:56
CPC Classifications
H; H01; H01B; H01B13/00; H01B13/06; G; G01; G01R; G01R31/00; G01R31/50; G01R31/58; G01R31/59; H01B13/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
107 words
A method of controlling capacitance unbalance-to-ground between conductors in which individual conductors are covered with a plastic insulating material to form insulated conductors and the coaxial capacitance and outside diameter of each of the conductors is measured, CHARACTERIZED BY generating electrical signals corresponding to the measured coaxial capacitance and outside diameter of each insulated conductor and relating these signals to capacitance unbalance-to-ground between each said conductor and a reference insulated conductor having preselected values of coaxial capacitance and outside diameter; and controlling the process of covering of each conductor to maintain the capacitance unbalance-to-ground between each conductor and the reference conductor within a predetermined range of values.
Claim 2
Independent Claim
107 words
A method of controlling capacitance unbalance-to-ground between conductors in which individual conductors are covered with a plastic insulating material to form insulated conductors and the coaxial capacitance and outside diameter of each of the conductors is measured, CHARACTERIZED BY generating electrical signals corresponding to the measured coaxial capacitance and outside diameter of each insulated conductor and relating these signals to capacitance unbalance-to-ground between each said conductor and a reference insulated conductor having preselected values of coaxial capacitance and outside diameter; and controlling the process of covering of each conductor to maintain the capacitance unbalance-to-ground between each conductor and the reference conductor within a predetermined range of values.
Claim 3
Dependent Claim
39 words
Method in accordance with claim 1, CHARACTERIZED BY the additional steps of: covering individual conductors with at least a layer of cellular insulation to form insulated conductors; and twisting together conductors which have a substantially negligible capacitance unbalance-to-ground therebetween.
Claim 4
Dependent Claim
94 words
Method in accordance with claims 1 or 2, CHARACTERIZED BY the additional steps of displaying the measured coaxial capacitance and outside diameter as coordinate values on a graph of coaxial capacitance and outside diameter wherein the relating step includes superimposing lines of constant capacitance unbalance-to-ground as between an insulated conductor and the reference conductor on the graph; and defining a region of the graph between selected ones of its lines of constant capacitance unbalance-to-ground; the twisting being accomplished so as to pair conductors having measured coaxial capacitance and diameter which fall within said region.
Claim 5
Dependent Claim
42 words
Method in accordance with claim 3, CHARACTERIZED BY the additional step of superimposing on the graph lines of constant mutual capacitance which are related to the coaxial capacitance and outside diameter, thereby defining the region further between lines of constant mutual capacitance.
Claim 6
Dependent Claim
120 words
Apparatus for performing the method of any one of claims 1-4, CHARACTERIZED BY an extruder (31) provided for covering individual conductors with a plastic insulating material to form insulated conductors; monitor means (36,37) for measuring coaxial capacitance and outside diameter of each of the conductors; means (36,37) for generating electrical signals related to the measured coaxial capacitance and outside diameter of each insulated conductor and for relating these signals to capacitance unbalance-to-ground between each said conductor and a reference insulated conductor (65) having preselected values of coaxial capacitance and outside diameter; and means (100) for controlling the covering of each conductor to maintain the capacitance unbalance-to-ground between each said conductor and the reference conductor within a predetermined range of values.
References Cited (Backward Citations)
No citation records indexed.
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