Patent US4359908A successfully refreshed from Google Patents.
US4359908A
Expired / Lapsed
US
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Electrical bushing gas sampling apparatus and method
Assignee: General Electric Co
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Filing: 1980-12-29
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Granted: 1982-11-23
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Expires: 2000-12-29
Abstract
Abstract A sealable membrane is inserted within the filler plug receptacle of a high voltage bushing for providing access to the gas space above the dielectric oil used within the bushing. Gas sampling is achieved by inserting the needle of a hypodermic syringe through the membrane and withdrawing a quantity of gas to be sampled. The sealable properties of the membrane allow a plurality of samples to be taken without destroying the gas-tight seal.
Inventors
- 👤 Arnold M. Perras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:22
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/22
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
135 words
An adapter for providing gas sampling facility to an electrical bushing comprising: a first sealable membrane seated in the fill plug receptacle of an electrical bushing for providing a gastight seal to said bushing; a first plug member having external threads for threaded engagement in the fill plug receptacle to retain said first membrane therein and an internally threaded bore terminating in a reduced diameter central passage; a second sealable membrane seated in said threaded bore of said first plug member; and a second plug member having external threads for threaded engagement in said threaded bore of said first plug member to retain said second membrane therein and a central passage aligned with said central passage of said first plug member to accommodate the insertion of a syringe needle through said first and second membranes.
Claim 2
Dependent Claim
135 words
An adapter for providing gas sampling facility to an electrical bushing comprising: a first sealable membrane seated in the fill plug receptacle of an electrical bushing for providing a gastight seal to said bushing; a first plug member having external threads for threaded engagement in the fill plug receptacle to retain said first membrane therein and an internally threaded bore terminating in a reduced diameter central passage; a second sealable membrane seated in said threaded bore of said first plug member; and a second plug member having external threads for threaded engagement in said threaded bore of said first plug member to retain said second membrane therein and a central passage aligned with said central passage of said first plug member to accommodate the insertion of a syringe needle through said first and second membranes.
Claim 3
Dependent Claim
24 words
The adapter of claim 1 wherein said passage of said first plug member includes a hex-shaped cross section portion for receiving an Allen wrench.
Claim 4
Dependent Claim
29 words
The adapter of claim 1 wherein said passage within said plug member includes a tapered opening at one end to assist in guiding the entrance of the syringe needle.
Claim 5
Dependent Claim
25 words
The adapter of claim 3 wherein said passage of said second plug member includes a portion having a hex configuration for accepting an Allen wrench.
Claim 6
Dependent Claim
70 words
An electrical bushing comprising: a pair of first and second electrodes separated by means of a porcelain-skirted body section for providing electrical insulation between said first and second electrodes; an oil-fill plug receptacle within said bushing; a sealable membrane within said receptacle for providing a gastight seal to said bushing; and a plug member having a passage therethrough for insertion within said receptacle to retain said membrane within said receptacle.
Claim 7
Dependent Claim
70 words
An electrical bushing comprising: a pair of first and second electrodes separated by means of a porcelain-skirted body section for providing electrical insulation between said first and second electrodes; an oil-fill plug receptacle within said bushing; a sealable membrane within said receptacle for providing a gastight seal to said bushing; and a plug member having a passage therethrough for insertion within said receptacle to retain said membrane within said receptacle.
Claim 8
Dependent Claim
28 words
The bushing of claim 5 further including a groove within said plug member for retaining a second sealable membrane for providing a further gas-tight seal to said receptacle.
Claim 9
Dependent Claim
29 words
The bushing of claim 6 further including a second plug member having a passage for insertion within said first plug groove for retaining said second membrane within said groove.
Claim 10
Dependent Claim
27 words
The bushing of claim 7 wherein said plug member and said second plug member both contain a slot having a hex configuration for accommodating an Allen wrench.
Claim 11
Dependent Claim
31 words
The bushing of claim 7 wherein said second plug member includes a tapered slot for facilitating the insertion of a hypodermic needle for removing samples of gas contaminants from said bushing.
Claim 12
Independent Claim
61 words
A method for adapting an electrical bushing to provide gas sampling facility comprising the steps of: inserting a sealable membrane within an oil-fill inlet within an electrical bushing; and inserting at least one plug having a passage extending through the cross section of said plug for retaining said membrane within said inlet, said passage defining means for receiving a hypodermic needle.
Claim 13
Independent Claim
61 words
A method for adapting an electrical bushing to provide gas sampling facility comprising the steps of: inserting a sealable membrane within an oil-fill inlet within an electrical bushing; and inserting at least one plug having a passage extending through the cross section of said plug for retaining said membrane within said inlet, said passage defining means for receiving a hypodermic needle.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-22 | 1986-05-24 | 1986-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-22 | 1990-05-24 | 1990-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-22 | 1994-05-24 | 1994-11-23 | $7700.00 | Window Closed / Lapsed |