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Non-destructive Test for Wire Insulation

IP.com Disclosure Number: IPCOM000062232D
Original Publication Date: 1986-Oct-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Richards, AP: AUTHOR [+2]

Abstract

The quality of insulation on a conductor can be determined non-destructively by measuring current flow from the insulated conductor to a bare electrode while both are immersed in an ionic solution.

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Non-destructive Test for Wire Insulation

The quality of insulation on a conductor can be determined non-destructively by measuring current flow from the insulated conductor to a bare electrode while both are immersed in an ionic solution.

In the figure, insulated conductor 1 under test is immersed in an ionic solution 2, and is connected at one end by a scanning device 3 to the negative terminal of d.c. power supply 4. A bare conductive electrode 5 is also immersed in solution 2 out of contact with conductor 1 and connected through sense resistor Rs of known value to the positive terminal of power supply 4. Voltmeter 6 measures the potential difference across resistor Rs. Insulation resistance Rx is computed as: Rx = Rs[(Et/Es)-1] where Et is the power supply voltage and Es is the voltage drop across Rs.

In practice, solution 2 is 0.1 molar potassium chloride or sodium chloride or equivalent preferably maintained at approximately 50 degrees C, the power supply is 10 vdc and the s resistor Rs is one megohm. Scanning device 3 is shown as attached to conductor 1 to enable successive measurements of multiple conductors when conductor 1 is a cable.

Disclosed anonymously.

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