US3916671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas chromatographic analysis of pyrolysis products
Assignee: General Electric Co
•
Filing: 1974-04-08
•
Granted: 1975-11-04
•
Expires: 1994-04-08
Abstract
Abstract In a gas-cooled dynamoelectric machine, organic coatings and insulations give off submicron pyrolysis particles and gaseous products when overheated. The particles and gases are carried by the machine gas coolant through a sampling and analyzing apparatus which includes a gas chromatographic device. Readings taken from the gas chromatographic device are used to identify the materials emitting the particles and gases; and, hence the source of the over-heating may be located without disassembly of the dynamoelectric machine.
Inventors
- 👤 Chester C Carson
- 👤 Sterling C Barton
- 👤 Federico S Echeverria
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:01
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/28; G01N30/34; G01N30/04; G01N30/06; H; H02; H02K; H02K9/00; H02K9/24; H02K9/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
114 words
In combination with a gas-cooled dynamoelectric machine, an apparatus for sampling and analyzing thermal decomposition products which may be given off into the gas coolant due to localized overheating of dynamoelectric machine parts, said dynamoelectric machine including a high-pressure tap and a lowpressure tap; and, said apparatus connected between said highpressure tap and said low-pressure tap further comprising: a gas chromatographic column interconnecting said high-pressure tap and said low-pressure tap; a sampler device on the upstream side of said column; a detector on the downstream side of said column; and, means selectively supplying machine gas coolant through said sampler device in the sampling mode and carrier gas through said sampler in the analysis mode.
Claim 2
Dependent Claim
114 words
In combination with a gas-cooled dynamoelectric machine, an apparatus for sampling and analyzing thermal decomposition products which may be given off into the gas coolant due to localized overheating of dynamoelectric machine parts, said dynamoelectric machine including a high-pressure tap and a lowpressure tap; and, said apparatus connected between said highpressure tap and said low-pressure tap further comprising: a gas chromatographic column interconnecting said high-pressure tap and said low-pressure tap; a sampler device on the upstream side of said column; a detector on the downstream side of said column; and, means selectively supplying machine gas coolant through said sampler device in the sampling mode and carrier gas through said sampler in the analysis mode.
Claim 3
Dependent Claim
183 words
The apparatus recited in claim 1 wherein the selective gas supplying means further includes: a first conduit on the high-pressure tap side of the sampler device having a valve therein: a second conduit on the low-pressure tap side of the sampler device having a valve therein; a third conduit connected at one end to the low-pressure tap side of said sampler device and connected at the other end to said gas chromatographic column; a fourth conduit interconnecting said first and second conduits with said third conduit at a connection intermediate the ends of said third conduit; said third conduit further including a first valve between the sampler device and said connection and a second valve between the connection and the gas chromatographic column; a valve on the high-pressure tap side of the sampler device between the first conduit and the sampler device; and, a fifth conduit having one end connected between said valve on the high-pressure tap side of said sampler device and said sampler device, and the other end connected to said gas chromatographic column; said fifth conduit including a valve therein.
Claim 4
Dependent Claim
35 words
The apparatus recited in claim 2 wherein the valve on the high-pressure tap side of the sampler device is a solenoid valve actuated by a signal from an ion chamber detector connected to dynamoelectric machine.
Claim 5
Dependent Claim
14 words
The apparatus recited in claim 1 wherein the detector is a flame ionization detector.
Claim 6
Dependent Claim
192 words
In combination with a gas-cooled dynamoelectric machine, an apparatus for sampling and analyzing thermal decomposition products which may be given off into the gas coolant due to localized overheating of dynamoelectric machine parts, said dynamoelectric machine including a high-pressure tap and a low-pressure tap; and, said apparatus connected between said high-pressure tap and said low-pressure tap further comprising: a gas chromatographic column connected between said high-pressure tap and said low-pressure tap; first and second conduits, each connected at one end to the high- pressure tap and each connected at the other end to the high-pressure tap side of the gas chromatographic column; a heating device disposed along at Least a portion of the first conduit upstream from the gas chromatographic device; a gas purifier disposed in the second conduit upstream from the gas chromatographic column; a bypass conduit connected at one end to said first and second conduits on the high-pressure tap side of said gas chromatographic column and connected at the other end to the low-pressure tap; and, a valve upstream from said gas chromatographic column for selectively supplying machine gas coolant and purified gas coolant to said gas chromatographic column.
Claim 7
Dependent Claim
192 words
In combination with a gas-cooled dynamoelectric machine, an apparatus for sampling and analyzing thermal decomposition products which may be given off into the gas coolant due to localized overheating of dynamoelectric machine parts, said dynamoelectric machine including a high-pressure tap and a low-pressure tap; and, said apparatus connected between said high-pressure tap and said low-pressure tap further comprising: a gas chromatographic column connected between said high-pressure tap and said low-pressure tap; first and second conduits, each connected at one end to the high- pressure tap and each connected at the other end to the high-pressure tap side of the gas chromatographic column; a heating device disposed along at Least a portion of the first conduit upstream from the gas chromatographic device; a gas purifier disposed in the second conduit upstream from the gas chromatographic column; a bypass conduit connected at one end to said first and second conduits on the high-pressure tap side of said gas chromatographic column and connected at the other end to the low-pressure tap; and, a valve upstream from said gas chromatographic column for selectively supplying machine gas coolant and purified gas coolant to said gas chromatographic column.
Claim 8
Dependent Claim
33 words
The apparatus recited in claim 5 wherein the valve upstream from the gas chromatographic column is a solenoid valve actuated by a signal from an ion chamber detector connected to the dynamoelectric machine.
References Cited (Backward Citations)
US3258619A
Cited
US2988656A
Cited
US3087112A
Cited
US3427863A
Cited
US3361908A
Cited
US3427880A
Cited
US3680359A
Cited
US3807218A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |