US3750070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure ring for transformer windings
Assignee: ABB Inc USA
•
Filing: 1971-11-30
•
Granted: 1973-07-31
•
Expires: 1991-11-30
Abstract
Abstract Pressure ring apparatus for securing the windings of power transformers. The pressure ring includes a body portion with magnetic radial members positioned therein to direct the leakage flux from the winding structure back into the magnetic core. The radial members are constructed from a plurality of metallic laminations which are stacked with their edges perpendicular to the leakage flux. Other magnetic members may be positioned in the body portion to help direct the leakage flux into the radial members. In one embodiment of this invention, one side of the pressure ring is stepped to conform to the shape of the yoke portion of the magnetic core.
Inventors
- 👤 J Rissinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:10
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/30; H01F27/303; H01F27/34; H01F27/36; H01F27/366
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
73 words
A pressure ring for installation adjacent to an end of a transformer winding structure, comprising a non-magnetic body portion having upper and lower surfaces, the lower surface of said body portion having steps therein which conform to the shape of the magnetic core of the transformer, and magnetic members all aligned generally in a radial direction through said body portion, said magnetic members being positioned in grooves formed in said non-magnetic body portion.
Claim 2
Dependent Claim
73 words
A pressure ring for installation adjacent to an end of a transformer winding structure, comprising a non-magnetic body portion having upper and lower surfaces, the lower surface of said body portion having steps therein which conform to the shape of the magnetic core of the transformer, and magnetic members all aligned generally in a radial direction through said body portion, said magnetic members being positioned in grooves formed in said non-magnetic body portion.
Claim 3
Dependent Claim
21 words
The pressure ring of claim 1 wherein the body portion is constructed of laminated fibrous material bonded together by an epoxide.
Claim 4
Dependent Claim
34 words
The pressure ring of claim 1 wherein the magnetic members are constructed of a plurality of laminated magnetic strips, said strips positioned with their edges perpendicular to the longitudinal axis of the winding structure.
Claim 5
Dependent Claim
36 words
The pressure ring of claim 1 wherein the body portion also contains magnetic members all aligned generally in a circular direction around the longitudinal axis of the winding structure and located between the radial magnetic members.
Claim 6
Dependent Claim
116 words
A transformer comprising a magnetic core with a cruciform-type yoke section and a longitudinal winding structure with first and second ends, a pressure ring having first and second sides, said pressure ring comprising a non-magnetic body portion with radial members disposed in grooves therein, said first side being substantially flat, said second side being positioned adjacent to said yoke section of said core, said non-magnetic body portion which forms said second side being stepped to conform to the shape of said yoke section, said radial members being constructed of a plurality of laminations of magnetic strips, said strips being positioned in a radial direction with their edges perpendicular to the longitudinal axis of the winding structure.
Claim 7
Dependent Claim
116 words
A transformer comprising a magnetic core with a cruciform-type yoke section and a longitudinal winding structure with first and second ends, a pressure ring having first and second sides, said pressure ring comprising a non-magnetic body portion with radial members disposed in grooves therein, said first side being substantially flat, said second side being positioned adjacent to said yoke section of said core, said non-magnetic body portion which forms said second side being stepped to conform to the shape of said yoke section, said radial members being constructed of a plurality of laminations of magnetic strips, said strips being positioned in a radial direction with their edges perpendicular to the longitudinal axis of the winding structure.
References Cited (Backward Citations)
CA732318A
Cited
US2962679A
Cited
US2896182A
Cited
FR1201855A
Cited
FR1401109A
Cited
US3366907A
Cited
US3467932A
Cited
US3639872A
Cited
GB1245197A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |