US4236404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for monitoring dissolved gases in electrical insulating liquids such as transformer oils
Assignee: General Electric Co
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Filing: 1976-08-31
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Granted: 1980-12-02
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Expires: 1996-08-31
Abstract
Abstract A device to monitor dissolved gases in electrical insulating liquids such as transformer oils. The monitoring device includes a sampling means to obtain a liquid sample from the electrical device whose liquid is being monitored, a gas extraction means to extract the dissolved gases from the liquid sample, an injection means to inject the extracted gases into a gas chromatograph, and a gas chromatograph to analyze the dissolved gases to determine the concentration of various dissolved gases.
Inventors
- 👤 Marshall D. Ketchum
- 👤 Alexander J. Yerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:01
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/26; G01N33/28; G01N33/2835; G01N33/2841
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
171 words
A monitoring device for monitoring dissolved gases in the electrical insulating liquid of an electrical apparatus comprising: (a) valve means connected to an electrical apparatus to allow release of a portion of the electrical insulating liquid in such apparatus, (b) a sample means connected to said valve for receiving a predetermined amount of electrical insulating liquid from the electrical apparatus, (c) a gas extraction chamber connected to said sample means, (d) means to evacuate said gas extraction chamber, (e) means for moving said predetermined amount of liquid from said sample means to said gas extraction chamber, (1) said gas extraction chamber evacuating said liquid to extract a portion of gases dissolved in said liquid, (f) a gas chromatograph for receiving said extracted gases and analyzing the constituent parts thereof, (g) sample valve means between said gas extraction chamber and said gas chromatograph for injecting a predetermined quantity of extracted gases into said gas chromatograph, and (h) recording means for recording the results of said gas chromatograph analysis of said extracted gases.
Claim 2
Dependent Claim
171 words
A monitoring device for monitoring dissolved gases in the electrical insulating liquid of an electrical apparatus comprising: (a) valve means connected to an electrical apparatus to allow release of a portion of the electrical insulating liquid in such apparatus, (b) a sample means connected to said valve for receiving a predetermined amount of electrical insulating liquid from the electrical apparatus, (c) a gas extraction chamber connected to said sample means, (d) means to evacuate said gas extraction chamber, (e) means for moving said predetermined amount of liquid from said sample means to said gas extraction chamber, (1) said gas extraction chamber evacuating said liquid to extract a portion of gases dissolved in said liquid, (f) a gas chromatograph for receiving said extracted gases and analyzing the constituent parts thereof, (g) sample valve means between said gas extraction chamber and said gas chromatograph for injecting a predetermined quantity of extracted gases into said gas chromatograph, and (h) recording means for recording the results of said gas chromatograph analysis of said extracted gases.
Claim 3
Dependent Claim
26 words
A monitoring device as set forth in claim 1 in which said gas extraction chamber includes means for compressing said extracted gases to a predetermined volume.
Claim 4
Dependent Claim
33 words
A monitoring device as set forth in claim 1 in which a transducer is connected to said gas extraction chamber, said transducer providing a measurement of the total volume of said extracted gases.
Claim 5
Dependent Claim
41 words
A monitoring device as set forth in claim 1 in which a sample loop is connected between said gas extraction chamber and said sample valve, said sample loop receives a predetermined volume of extracted gases for injection by said sample valve.
Claim 6
Dependent Claim
50 words
A monitoring device as set forth in claim 1 in which said gas chromatograph includes a thermal conductivity detector and delay and separating columns, said delay and separating columns separating the constituent gases of interest in said extracted gases and said thermal conductivity detector detecting said constituent gases of interest.
Claim 7
Dependent Claim
23 words
A monitoring device as set forth in claim 5 in which neon gas is used as a carrier gas in said gas chromatograph.
Claim 8
Dependent Claim
31 words
A monitoring device as set forth in claim 1 in which means are connected to said sample means to discharge said predetermined amount of electrical insulating liquid, purging said sample means.
Claim 9
Dependent Claim
56 words
A monitoring device as set forth in claim 1 in which a manifold means is connected to said sample means, said manifold means having a plurality of inlet ports to allow a plurality of electrical apparatus to be connected to said sample means, for sequentially analyzing dissolved gases in each of said plurality of electrical apparatus.
Claim 10
Dependent Claim
38 words
A monitoring device as set forth in claim 8 in which said manifold means is provided with a separate inlet port to receive a sample of electrical insulating liquid to provide analysis of dissolved gases in said sample.
Claim 11
Dependent Claim
44 words
A monitoring device as set forth in claim 1 in which a standard gas of know composition is provided and means are provided to inject a sample of said standard gas into said gas chromatograph to establish the proper functioning of said gas chromatograph.
References Cited (Backward Citations)
US2846121A
Cited
US3247702A
Cited
US3394582A
Cited
US3824838A
Cited
US3680359A
Cited
US3844160A
Cited
US3866460A
Cited
US3968678A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |