US3797314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for determining the top oil temperature in transformers
Assignee: ABB Norden Holding AB
•
Filing: 1972-07-10
•
Granted: 1974-03-19
•
Expires: 1992-07-10
Abstract
Abstract For determining the highest oil temperature in a transformer, a temperature-sensitive transducer in the form of a hollow closed body is arranged adjacent the point in the upper part of the winding where the oil temperature is assumed to be highest and is connected by a conducting tube to a measuring device located outside the transformer. The transducer and the connecting tube are filled with a liquid having a higher coefficient of expansion than the material of the transducer and a boiling point which is higher than the highest permissible oil temperature. The tube has a volume which is small in relation to the volume of the transducer.
Inventors
- 👤 W Lampe
- 👤 E Spicar
- 👤 B Persson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:48
CPC Classifications
G; G01; G01K; G01K5/00; G01K1/00; G01K1/14; H; H01; H01F; H01F27/00; H01F27/40; H01F27/402; H01F27/404; H01F27/406
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
153 words
Means for determining the highest oil temperature in transformers with the help of a system comprising a temperaturesensitive transducer in the form of a hollow closed body which is arranged adjacent tHe point in the upper part of a winding where the oil temperature is assumed to be highest, a measuring device located outside the transformer, and a tube connecting the transducer to the measuring device the transducer 2,2'' and the connecting tube 13 being filled with a liquid having a higher coefficient of cubical expansion than the material of the transducer and a boiling point which is higher than the highest permissible oil temperature, the tube having a volume which is small in relation to the volume of the transducer, the transformer having a plurality of collars 4,7 and spacers 3 which guide the oil flow at the upper end of the winding, the transducer being located within said collars and spacers.
Claim 2
Dependent Claim
153 words
Means for determining the highest oil temperature in transformers with the help of a system comprising a temperaturesensitive transducer in the form of a hollow closed body which is arranged adjacent tHe point in the upper part of a winding where the oil temperature is assumed to be highest, a measuring device located outside the transformer, and a tube connecting the transducer to the measuring device the transducer 2,2'' and the connecting tube 13 being filled with a liquid having a higher coefficient of cubical expansion than the material of the transducer and a boiling point which is higher than the highest permissible oil temperature, the tube having a volume which is small in relation to the volume of the transducer, the transformer having a plurality of collars 4,7 and spacers 3 which guide the oil flow at the upper end of the winding, the transducer being located within said collars and spacers.
Claim 3
Dependent Claim
14 words
Means according to claim 1, in which the liquid consists essentially of transformer oil.
Claim 4
Dependent Claim
49 words
Means according to claim 1, in which the transducer comprises a second tube, closed at one end, which is bent and is located in the path of the oil which has passed the winding, and the other end of the second tube is connected to the connecting tube 13.
Claim 5
Dependent Claim
23 words
Means according to claim 1, in which the transducer comprises a number of part-transducers 2 connected in parallel to the connecting tube 13.
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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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |