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Patent US4441073A successfully refreshed from Google Patents.
US4441073A
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Resistivity sensor system for detecting faults in sealed gas-insulated electrical apparatus
Assignee: Electric Power Research Institute
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Filing: 1980-12-22
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Granted: 1984-04-03
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Expires: 2000-12-22
Abstract
Abstract A resistivity sensor system for use with sealed, gas-insulated electrical apparatus. The system includes a resistivity sensor for placement within a housing of the electrical apparatus. The sensor itself includes an electrically insulating substrate, a pair of spaced-apart electrodes located on the substrate, and a polymer film in the space between the electrodes. The electrical resistivity across the polymer film changing significantly with the occurrence of a fault within the vicinity of the sensor, as the fault causes a reaction at the polymer film. To detect the location of the fault, a voltage is applied across the electrodes, and the current flowing through the electrodes is measured.
Inventors
- 👤 William D. Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:32
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/08; G01R31/088; G01R31/12; G01R31/1227; G01R31/1254
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
152 words
A resistivity sensor system for use with sealed gas-insulated electrical power apparatus to detect faults, comprising: a plurality of resistivity sensors positioned within a housing of said electrical power apparatus wherein said sensors are spaced from one another and include (i) an electrically insulating substrate, (ii) a pair of spaced apart electrodes located on said substrate, and (iii) a polymer film in the space between said electrodes wherein the occurrence of a fault in the vicinity of said sensor produces arc by-products that cause a reaction at said polymer film to change the electrical resistivity across said polymer film in accordance with the distance that said sensor is from the location of the fault; means for applying a voltage across said electrodes; means for measuring current flowing through said electrodes; and means responsive to changes in said current flowing through said sensors to indicate which of said sensors is nearest said fault.
Claim 2
Dependent Claim
152 words
A resistivity sensor system for use with sealed gas-insulated electrical power apparatus to detect faults, comprising: a plurality of resistivity sensors positioned within a housing of said electrical power apparatus wherein said sensors are spaced from one another and include (i) an electrically insulating substrate, (ii) a pair of spaced apart electrodes located on said substrate, and (iii) a polymer film in the space between said electrodes wherein the occurrence of a fault in the vicinity of said sensor produces arc by-products that cause a reaction at said polymer film to change the electrical resistivity across said polymer film in accordance with the distance that said sensor is from the location of the fault; means for applying a voltage across said electrodes; means for measuring current flowing through said electrodes; and means responsive to changes in said current flowing through said sensors to indicate which of said sensors is nearest said fault.
Claim 3
Dependent Claim
12 words
The sensor system of claim 1 wherein said polymer is polyvinyl pyridine.
Claim 4
Dependent Claim
14 words
The sensor system of claim 1 wherein said insulating substrate is constructed of alumina.
Claim 5
Dependent Claim
15 words
The sensor system of claim 3 wherein said electrodes are formed by platinum-silver conductor paths.
Claim 6
Dependent Claim
15 words
The sensor system of claim 3 wherein said electrodes are formed by platinum-gold conductor paths.
Claim 7
Dependent Claim
19 words
The sensor system of claim 1 wherein said substrate is a glass-epoxy material with said electrodes being photoetched thereon.
Claim 8
Dependent Claim
22 words
The sensor system of claim 1 wherein said means for applying a voltage across said electrodes includes a direct current voltage source.
Claim 9
Dependent Claim
13 words
The sensor system of claim 1 wherein said measuring means is an ammeter.
Claim 10
Dependent Claim
19 words
The sensor system of claim 1 wherein the thickness of said polymer film is about 0.001 of an inch.
Claim 11
Dependent Claim
12 words
The sensor system of claim 1 wherein said electrodes are interdigitated electrodes.
Claim 12
Dependent Claim
179 words
A resistivity sensor system for use with gas-insulated, sealed electrical power apparatus to detect arc-over locations, comprising: a plurality of resistivity sensors positioned within a housing of said electrical power apparatus wherein said sensors are spaced from one another and each of said sensors include (i) an electrically insulating substrate, (ii) a pair of spaced apart interdigitated electrodes formed on a surface of said substrate defining with said substrate an electrode surface, and (iii) a polymer coating adhering to said electrode surface wherein the occurrence of a fault in the vicinity of said sensor produces arc by-products that cause a reaction at said polymer coating to vary the electrical resistivity across said polymer coating in accordance with the concentration of arc by-products, produced by an arc-over, present in the vicinity of said sensor; means for applying a voltage across said electrodes; means for measuring the current flowing through said electrodes to determine the resistance between said electrodes; and means responsive to changes in said current flowing through said sensors to indicate which of said sensors is nearest said fault.
Claim 13
Dependent Claim
179 words
A resistivity sensor system for use with gas-insulated, sealed electrical power apparatus to detect arc-over locations, comprising: a plurality of resistivity sensors positioned within a housing of said electrical power apparatus wherein said sensors are spaced from one another and each of said sensors include (i) an electrically insulating substrate, (ii) a pair of spaced apart interdigitated electrodes formed on a surface of said substrate defining with said substrate an electrode surface, and (iii) a polymer coating adhering to said electrode surface wherein the occurrence of a fault in the vicinity of said sensor produces arc by-products that cause a reaction at said polymer coating to vary the electrical resistivity across said polymer coating in accordance with the concentration of arc by-products, produced by an arc-over, present in the vicinity of said sensor; means for applying a voltage across said electrodes; means for measuring the current flowing through said electrodes to determine the resistance between said electrodes; and means responsive to changes in said current flowing through said sensors to indicate which of said sensors is nearest said fault.
Claim 14
Dependent Claim
12 words
The sensor system of claim 11 wherein said polymer is polyvinyl pyridine.
Claim 15
Dependent Claim
14 words
The sensor system of claim 12 wherein said insulating substrate is constructed of alumina.
Claim 16
Dependent Claim
15 words
The sensor system of claim 13 wherein said electrodes are formed by platinum-silver conductor paths.
Claim 17
Dependent Claim
15 words
The sensor system of claim 13 wherein said electrodes are formed by platinum-gold conductor paths.
Claim 18
Dependent Claim
21 words
The sensor system of claims 14 or 15 wherein the thickness of said polymer coating is about 0.001 of an inch.
Claim 19
Dependent Claim
22 words
The sensor system of claim 16 wherein said means for applying a voltage across said electrodes includes a direct current voltage source.
Claim 20
Independent Claim
125 words
A method of detecting faults in gas-insulated, sealed electrical apparatus, comprising: positioning a plurality of resistivity sensors within a housing of said electrical apparatus to be spaced from one another wherein each of said sensors includes a spaced apart pair of electrodes located on an insulating electrical substrate, a polymer coating adhering to said electrodes and the space therebetween, the occurrence of a fault in the vicinity of said sensors producing arc by-products that cause a reaction at said polymer coating to cause a change in the resistivity across said polymer coating; applying a voltage across said electrodes; measuring the current flowing through said electrodes; and determining which of said sensors is nearest said fault based upon the change in current flow through said sensors.
Claim 21
Independent Claim
125 words
A method of detecting faults in gas-insulated, sealed electrical apparatus, comprising: positioning a plurality of resistivity sensors within a housing of said electrical apparatus to be spaced from one another wherein each of said sensors includes a spaced apart pair of electrodes located on an insulating electrical substrate, a polymer coating adhering to said electrodes and the space therebetween, the occurrence of a fault in the vicinity of said sensors producing arc by-products that cause a reaction at said polymer coating to cause a change in the resistivity across said polymer coating; applying a voltage across said electrodes; measuring the current flowing through said electrodes; and determining which of said sensors is nearest said fault based upon the change in current flow through said sensors.
Claim 22
Dependent Claim
11 words
The method of claim 18 wherein said polymer is polyvinyl pyridine.
Claim 23
Dependent Claim
16 words
The method of claim 18 wherein a direct current voltage source is applied across said electrodes.
References Cited (Backward Citations)
US2433505A
Cited
US3703696A
Cited
US3891958A
Cited
US4241019A
Cited
JPS54137644A
Cited
JPS5551347A
Cited
JPS5578235A
Cited
US4249126A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-03 | 1987-10-03 | 1988-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-03 | 1991-10-03 | 1992-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-03 | 1995-10-03 | 1996-04-03 | $7700.00 | Window Closed / Lapsed |