US5128269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for monitoring unusual signs in gas-charged apparatus
Assignee: Toshiba Corp
•
Filing: 1989-03-29
•
Granted: 1992-07-07
•
Expires: 2009-03-29
Abstract
Abstract A method for monitoring unusual signs such as partial heatings and partial electric discharges in an apparatus to be monitored, in which a sealed gas is enclosed into a tank containing the apparatus, and at least one of monitor gases represented by formulas (I) and (II), C.sub.n X.sub.2n (I) C.sub.n X.sub.2n+2 (II) wherein X is at least one of H, F, Cl, Br and I, and n is one of 2, 3, 4 and 5, is charged into the tank, and in which a reaction product gas of the monitor gas, generated due to an abnormality of the apparatus to be monitored, is detected using a detector. A gas-charged apparatus including an unusual sign monitor is also disclosed.
Inventors
- 👤 Toshiro Oitate
- 👤 Yasuo Kinjo
- 👤 Masami Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:40
CPC Classifications
H; H02; H02B; H02B13/00; H02B13/02; H02B13/035; H02B13/065; H01; H01F; H01F27/00; H01F27/08; H01F27/20; G; G01; G01R; G01R31/00; G01R31/12; G01R31/1227; G01R31/1254; Y; Y10; Y10T; Y10T436/00; Y10T436/19; Y10T436/196666
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
A method for monitoring abnormal states in an apparatus to be monitored, comprising: enclosing an insulating gas into a tank containing an apparatus; adding to said insulting gas at least one monitor gas selected from the the group consisting of gases represented by formulas (I) and (II), C.sub.n X.sub.2n (I) C.sub.n X.sub.2n+2 (II) wherein X is at least one of H, F, Cl, Br and I, and n is one of 2, 3, 4 and 5; and detecting a reaction product gas produced by a chemical reaction of the monitor gas within said tank, geneated due to an abnormal state of the apparatus to be monitored, using a detector.
Claim 2
Independent Claim
109 words
A method for monitoring abnormal states in an apparatus to be monitored, comprising: enclosing an insulating gas into a tank containing an apparatus; adding to said insulting gas at least one monitor gas selected from the the group consisting of gases represented by formulas (I) and (II), C.sub.n X.sub.2n (I) C.sub.n X.sub.2n+2 (II) wherein X is at least one of H, F, Cl, Br and I, and n is one of 2, 3, 4 and 5; and detecting a reaction product gas produced by a chemical reaction of the monitor gas within said tank, geneated due to an abnormal state of the apparatus to be monitored, using a detector.
Claim 3
Dependent Claim
23 words
The method of claim 1, wherein the apparatus to be monitored is one of gas-insulated transformer, gas-insulated switchgear, gas circuit breaker and turbine.
Claim 4
Dependent Claim
43 words
The method of claim 1, wherein said monitor gas is selected from the group of gases consisting of C 2 F 4 , C 2 F 6 , C 3 F 6 , C 3 F 8 and C 4 F 10 .
Claim 5
Dependent Claim
26 words
The method of claim 1, wherein the concentration of the monitor gas in the tank is in a range of approximately 0.1 to 30% by weight.
Claim 6
Dependent Claim
20 words
The method of claim 1, wherein the insulating gas is selected from the group consisting of SF 6 and air.
Claim 7
Dependent Claim
16 words
The method of claim 1, wherein the gases in the tank are cooled using a cooler.
Claim 8
Dependent Claim
17 words
The method of claim 1, wherein the apparatus to be monitored is directly cooled using a cooler.
References Cited (Backward Citations)
US2853540A
Cited
US3186214A
Cited
DE1488883A1
Cited
US3364729A
Cited
US3585845A
Cited
US3487677A
Cited
US3577769A
Cited
US3738158A
Cited
GB2004128A
Cited
JPS5678308A
Cited
US4485367A
Cited
US4549817A
Cited
EP0121267A1
Cited
EP0159440A2
Cited
EP0153637A1
Cited
JPS6276472A
Cited
JPS63242125A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-07 | 1996-01-06 | 1996-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-07 | 2000-01-06 | 2000-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-07 | 2004-01-06 | 2004-07-07 | $7700.00 | Window Closed / Lapsed |