Patent US3596135A successfully refreshed from Google Patents.
US3596135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for detection of breakdown of insulation in electrical equipment
Assignee: Individual
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Filing: 1966-11-07
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Granted: 1971-07-27
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Expires: 1986-11-07
Abstract
Abstract An electromagnetic sensing device is adapted to respond to electromagnetic signals generated in electrical equipment such as transformers, and to amplify the signals for actuating an indicator or control mechanism, the signals change because of incipient breakdowns in insulation in the equipment thereby causing a change in the indicator or control mechanism which results in shutting down the equipment prior to a major breakdown of insulation.
Inventors
- 👤 Andrew Stenger Jr
- 👤 James S Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:04
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/04; H02H1/00; H02H1/0007; H02H1/0015
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
77 words
A transformer or the like including a metal casing, a protective system for said transformer comprising a switch to control the power to said transformer, and a device adapted to respond to electromagnetic signals for sensing electromagnetic signals produced in said casing as a result of electric current passing through said transformer, said device including electric current amplifying means for operating said switch in response to a change in character of said electromagnetic signals in said casing.
Claim 2
Dependent Claim
77 words
A transformer or the like including a metal casing, a protective system for said transformer comprising a switch to control the power to said transformer, and a device adapted to respond to electromagnetic signals for sensing electromagnetic signals produced in said casing as a result of electric current passing through said transformer, said device including electric current amplifying means for operating said switch in response to a change in character of said electromagnetic signals in said casing.
Claim 3
Dependent Claim
39 words
A protective system of the type set forth in claim 1 in which said electric current amplifying means includes a grid tube, and a circuit through said tube, the grid of said tube being responsive to said electromagnetic signals.
Claim 4
Dependent Claim
62 words
A transformer as defined in claim 1 further characterized by said electrical current amplifying means comprising an electric power circuit connected with said switch means, a current control device in said power circuit including a biasing element controlling the flow of current through said control device, said biasing element being responsive to change in a character of electromagnetic signals in said casing.
Claim 5
Dependent Claim
13 words
A transformer as defined in claim 3 characterized by the casing being grounded.
Claim 6
Independent Claim
68 words
A system for indicating incipient short circuiting conditions in electric power equipment of the type having insulated windings, said system comprising an electric current responsive device having means movable in response to changes in current flow therein, and means responsive to electromagnetic waves produced in said equipment when said equipment is energized to vary the current flow in said device in response to changes in said electromagnetic waves.
Claim 7
Independent Claim
68 words
A system for indicating incipient short circuiting conditions in electric power equipment of the type having insulated windings, said system comprising an electric current responsive device having means movable in response to changes in current flow therein, and means responsive to electromagnetic waves produced in said equipment when said equipment is energized to vary the current flow in said device in response to changes in said electromagnetic waves.
Claim 8
Dependent Claim
39 words
A system as defined in claim 5 characterized by the last-mentioned means including a detector circuit having a current flow control element responsive to electromagnetic waves produced in said equipment, and the output of the detector controlling said device.
Claim 9
Dependent Claim
22 words
A system as defined in claim 6 characterized by the sensitivity of said device to the output of said detector being adjustable.
Claim 10
Dependent Claim
35 words
A system as defined in claim 6 in which the detector circuit includes a grid controlled vacuum tube, the grid of said tube being controlled by an element subjected to electromagnetic waves in said equipment.
Claim 11
Dependent Claim
34 words
A system as defined in claim 5 characterized by said device comprising an indicator, and means to adjust the indicator for a reading of electromagnetic waves occuring in said equipment during normal operation thereof.
Claim 12
Dependent Claim
49 words
A system as defined in claim 5 characterized by said device comprising a relay adapted to be operative to one position in response to a given electromagnetic wave characteristic in said equipment and operative to a second position in response to a different electromagnetic wave characteristic in said equipment.
Claim 13
Dependent Claim
43 words
A system as defined in claim 5 in which the last-mentioned means includes a detector circuit and an amplifier circuit, said detector circuits being subjected to electromagntic wave in said equipment, and said amplifier being responsive to the output of said detector circuit.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |