US3866460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas detector for fluid-filled electrical apparatus
Assignee: ABB Inc USA
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Filing: 1973-05-30
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Granted: 1975-02-18
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Expires: 1993-05-30
Abstract
Abstract Apparatus and arrangements thereof for detecting the presence of one or more specific gases in the fluid coolant of electrical apparatus. In one embodiment, a diffusion membrane separates the gases from the liquid coolant to provide a gas mixture. Another diffusion membrane separates any hydrogen from the gas mixture. The hydrogen which diffuses through the latter membrane is confined within a closed chamber. Thermal conductivity apparatus measures the pressure of the hydrogen in the chamber, thereby providing an indication of the amount of hydrogen in the chamber and in the liquid coolant. The amount of hydrogen in the liquid coolant is related to the fault history of the electrical apparatus. In other embodiments, the hydrogen contained in a gas coolant is diffused through a single membrane, and the presence of certain gases is indicated by combustibility measuring apparatus.
Inventors
- 👤 Jr Henry A Pearce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:30
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/08; H01F27/10; H01F27/12; H01F27/14; G; G01; G01N; G01N7/00; G01N7/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
197 words
A gas detector for oil-filled electrical apparatus which indicates the amount of a predetermined gas in the oil, comprising: a first chamber; a first diffusion membrane which defines a portion of said first chamber, said gas detector adapted for placement with said first diffusion membrane directly in contact with the oil; said first diffusion membrane being constructed of a material which permits gas contained in the oil to diffuse through said membrane to equalize the partial pressures of the gases on both sides of said membrane; a second chamber; a second diffusion membrane which defines a portion of said second chamber, said second diffusion membrane being located in direct contact with the gaseous atmosphere in the first chamber; said first and second chambers being sealed for the prevention of any forced fluid flow through the chambers; said second diffusion membrane being constructed of A material which permits only one predetermined gas which is contained in the gaseous atmosphere to diffuse through said second diffusion membrane to equalize the partial pressures of the predetermined gas on both sides of said second diffusion membrane; and indicating means for indicating the pressure of the predetermined gas in the second chamber.
Claim 2
Dependent Claim
197 words
A gas detector for oil-filled electrical apparatus which indicates the amount of a predetermined gas in the oil, comprising: a first chamber; a first diffusion membrane which defines a portion of said first chamber, said gas detector adapted for placement with said first diffusion membrane directly in contact with the oil; said first diffusion membrane being constructed of a material which permits gas contained in the oil to diffuse through said membrane to equalize the partial pressures of the gases on both sides of said membrane; a second chamber; a second diffusion membrane which defines a portion of said second chamber, said second diffusion membrane being located in direct contact with the gaseous atmosphere in the first chamber; said first and second chambers being sealed for the prevention of any forced fluid flow through the chambers; said second diffusion membrane being constructed of A material which permits only one predetermined gas which is contained in the gaseous atmosphere to diffuse through said second diffusion membrane to equalize the partial pressures of the predetermined gas on both sides of said second diffusion membrane; and indicating means for indicating the pressure of the predetermined gas in the second chamber.
Claim 3
Dependent Claim
15 words
The gas detector of claim 1 wherein the first diffusion membrane material comprises silicone rubber.
Claim 4
Dependent Claim
15 words
The gas detector of claim 1 wherein the first diffusion membrane material comprises fluorosilicone rubber.
Claim 5
Dependent Claim
16 words
The gas detector of claim 1 wherein the second diffusion membrane material comprises palladium and silver.
Claim 6
Dependent Claim
13 words
The gas detector of claim 1 wherein the one predetermined gas is hydrogen.
Claim 7
Dependent Claim
32 words
The gas detector of claim 1 wherein the indicating means includes a thermal conductivity gauge electrically connected to a heat generating element and a heat sensing element contained within said second chamber.
Claim 8
Dependent Claim
15 words
The gas detector of claim 1 wherein the indicating means includes a temperature compensating means.
Claim 9
Dependent Claim
43 words
The gas detector of claim 1 wherein the indicating means includes a temperature responsive resistance element contained within the second chamber, and means for measuring the resistance of the temperature responsive resistance element when a predetermined amount of power is being dissipated thereby.
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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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |