US3742349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for quantitatively evaluating integrity of winding insulation
Assignee: General Electric Co
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Filing: 1971-05-06
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Granted: 1973-06-26
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Expires: 1991-05-06
Abstract
Abstract Method and apparatus for obtaining an indication of the overall integrity of an electrically insulative material supported on an electrical conductor which in turn may be accommodated on an electrically conductive structure such as a magnetic core. The conductor and conductor accommodating structure are preferably completely surrounded by a conductive fluid, e.g., tap water; a preselected voltage is applied across the conductor and fluid; and the resistive and capacitive components of current flowing through the conductor and fluid are then determined and compared, preferably by determining the relationship of one current component to the other current component. This relationship is referred to herein as the ''''DF'''' or dissipation factor, and is indicative of the overall integrity and insulating quality of the electrically insulative covering.
Inventors
- 👤 H Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:02
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/34
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
107 words
A method of quantitatively evaluating the integrity of insulation on an insulated conductor, the method including the steps of: submerging at least part of the insulated conductor in a conductive fluid disposed within a first container; applying a voltage across the conductor and the conductive fluid; and developing at least two distinct electric signals with one of said signals indicative of capacitive current flow between the conductive fluid and insulated portions of the conductor, and with another of said electrical signals indicative of resistive current flow directly between the conductive fluid and uninsulated portions of the conductor exposed to and in direct contact with the conductive fluid.
Claim 2
Independent Claim
107 words
A method of quantitatively evaluating the integrity of insulation on an insulated conductor, the method including the steps of: submerging at least part of the insulated conductor in a conductive fluid disposed within a first container; applying a voltage across the conductor and the conductive fluid; and developing at least two distinct electric signals with one of said signals indicative of capacitive current flow between the conductive fluid and insulated portions of the conductor, and with another of said electrical signals indicative of resistive current flow directly between the conductive fluid and uninsulated portions of the conductor exposed to and in direct contact with the conductive fluid.
Claim 3
Dependent Claim
60 words
The method of claim 1 further comprising the steps of: providing a second container with a sample of substantially the same conductive fluid as the conductive fluid in the first container; developing a compensating signal related to the conductivity of the sample of fluid; and utilizing the compensating signal while developing at least one of the two distinct electrical signals.
Claim 4
Dependent Claim
45 words
The method of claim 1 further comprising the step of forming a ratio of the signals related to the capacitive and resistive components of current flowing between the connections thereby to establish a factor that is a quantitative indicator of the quality of the insulation.
Claim 5
Independent Claim
65 words
A method of evaluating the integrity of an insulation coating supported on an electrical conductor, the method comprising: surrounding the conductor with a conductive fluid; applying a voltage across the fluid and conductor; and providing at least a proportional indication in of the total surface area of insulation in communication with the fluid by determining the capacitive component of leakage current flowing through the conductor.
Claim 6
Independent Claim
65 words
A method of evaluating the integrity of an insulation coating supported on an electrical conductor, the method comprising: surrounding the conductor with a conductive fluid; applying a voltage across the fluid and conductor; and providing at least a proportional indication in of the total surface area of insulation in communication with the fluid by determining the capacitive component of leakage current flowing through the conductor.
Claim 7
Independent Claim
84 words
A method of quantitatively evaluating the integrity of insulation supported on an electrical conductor, the method comprising: disposing the electrical conductor in a conductive medium; applying a voltage across the conductor and the medium; deriving a first signal at least proportionally indicative of the total surface area of insulation on the conductor and in communication with the conductive medium; and deriving a second signal at least proportionally indicative of the total uninsulated area of the conductor that is in communication with the conduCtive medium.
Claim 8
Independent Claim
84 words
A method of quantitatively evaluating the integrity of insulation supported on an electrical conductor, the method comprising: disposing the electrical conductor in a conductive medium; applying a voltage across the conductor and the medium; deriving a first signal at least proportionally indicative of the total surface area of insulation on the conductor and in communication with the conductive medium; and deriving a second signal at least proportionally indicative of the total uninsulated area of the conductor that is in communication with the conduCtive medium.
Claim 9
Dependent Claim
35 words
The method of claim 5 further comprising forming a ratio of the first and second signals thereby to establish a dissipation factor representing a quantitative evaluation of the integrity of the insulation on the conductor.
Claim 10
Dependent Claim
121 words
An improved apparatus for use in determining the integrity of insulation supported on a winding conductor comprising: first connection means for establishing an electrical interconnection with at least selected portions of the surface of the insulation; second connection means for establishing an electrical interconnection with the winding conductor; means for applying a voltage across said first and second connection means; first circuit means for providing a first signal related to the capacitive leakage current flowing between the winding conductor and said first connection means; second circuit means for providing a second signal indicative of the applied voltage; and third circuit means for combining the two signals to provide a third signal indicative of the reactive power supplied to the winding conductor.
Claim 11
Dependent Claim
121 words
An improved apparatus for use in determining the integrity of insulation supported on a winding conductor comprising: first connection means for establishing an electrical interconnection with at least selected portions of the surface of the insulation; second connection means for establishing an electrical interconnection with the winding conductor; means for applying a voltage across said first and second connection means; first circuit means for providing a first signal related to the capacitive leakage current flowing between the winding conductor and said first connection means; second circuit means for providing a second signal indicative of the applied voltage; and third circuit means for combining the two signals to provide a third signal indicative of the reactive power supplied to the winding conductor.
Claim 12
Dependent Claim
23 words
The apparatus of claim 7 further comprising means for selectively introducing a phase shift in the second signal indicative of the applied voltage.
Claim 13
Dependent Claim
38 words
The apparatus of claim 7 wherein said first connection means includes an electrically conductive fluid contacting the insulation and the second connection means comprises termination means for interconnecting the means for applying a voltage and the winding conductor.
Claim 14
Dependent Claim
204 words
Apparatus for providing a signal indicative of the insulating integrity of an insulation coating formed on an electrical conductor comprising: connection means for establishing an electrical interconnection with at least selected portions of the surface of the insulation coating; means for applying a voltage across the electrical conductor and said connection means; first circuit means for providing a first signal related to the current flowing between the electrical conductor and said connection means; second circuit means for providing a second signal related to the voltage applied across the electrical conductor and connection means; third circuit means for providing a third signal out of phase with said second signal; fourth circuit means for combining the first signal and the second signal to provide a first combined signal related to the active power supplied through the conductor; fifth circuit means for combining the first signal and the third signal to provide a second combined signal related to the reactive power supplied through the conductor; and sixth circuit means for combining the first and second combined signals to inter-relate the reactive power and active power supplied through the conductor, thereby to provide a signal indicative of the insulating integrity of the insulation coating on the electrical conductor.
Claim 15
Dependent Claim
204 words
Apparatus for providing a signal indicative of the insulating integrity of an insulation coating formed on an electrical conductor comprising: connection means for establishing an electrical interconnection with at least selected portions of the surface of the insulation coating; means for applying a voltage across the electrical conductor and said connection means; first circuit means for providing a first signal related to the current flowing between the electrical conductor and said connection means; second circuit means for providing a second signal related to the voltage applied across the electrical conductor and connection means; third circuit means for providing a third signal out of phase with said second signal; fourth circuit means for combining the first signal and the second signal to provide a first combined signal related to the active power supplied through the conductor; fifth circuit means for combining the first signal and the third signal to provide a second combined signal related to the reactive power supplied through the conductor; and sixth circuit means for combining the first and second combined signals to inter-relate the reactive power and active power supplied through the conductor, thereby to provide a signal indicative of the insulating integrity of the insulation coating on the electrical conductor.
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) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |