US3909759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bushing well for instrument transformer and transformers including such well
Assignee: General Electric Co
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Filing: 1974-04-08
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Granted: 1975-09-30
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Expires: 1994-04-08
Abstract
Abstract Bushing well for use with instrument transformers is molded of a silica filled epoxy material having a conductive ground coating on one end and an opening at the other end to receive the high voltage conductor of the instrument transformer. A conductive coating is provided at such other end to form a high voltage shield for the instrument transformer conductor. The bushing well is molded into the body of a dry-type instrument transformer with the ground coating end adapted to receive a termination module and the conductor of such transformer extending through the opening and into the bushing well.
Inventors
- 👤 Ronald J Ouellette
- 👤 Robert S Canney
- 👤 Ralph B Stetson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:32
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/02; H01F27/04; H01B; H01B17/00; H01B17/26; H01B17/28; H01F38/00; H01F38/20; Y; Y10; Y10S; Y10S439/00; Y10S439/921; Y10S439/931
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
129 words
A molded bushing well for use with instrument transformers to provide high voltage connections thereto comprising: a cup shaped body molded of electrical insulating material, said body having a first end portion with an outer surface of one diameter and a second or inner end portion with an outer surface of a larger diameter, said end portions being joined by a groove, said first outer surface having a conductive coating thereon, said cup shaped body having a well therein tapering inwardly from said first end and contoured to receive a termination module, the inner end of said well having an opening for receiving a threaded conductor stud of an instrument transformer, the surface of said opening in said inner end of said well being provided with a conductive coating.
Claim 2
Dependent Claim
129 words
A molded bushing well for use with instrument transformers to provide high voltage connections thereto comprising: a cup shaped body molded of electrical insulating material, said body having a first end portion with an outer surface of one diameter and a second or inner end portion with an outer surface of a larger diameter, said end portions being joined by a groove, said first outer surface having a conductive coating thereon, said cup shaped body having a well therein tapering inwardly from said first end and contoured to receive a termination module, the inner end of said well having an opening for receiving a threaded conductor stud of an instrument transformer, the surface of said opening in said inner end of said well being provided with a conductive coating.
Claim 3
Dependent Claim
22 words
A molded bushing well as claimed in claim 1, in which said bushing well is molded of a silica filled epoxy resin.
Claim 4
Dependent Claim
20 words
A molded bushing well as claimed in claim 1, in which said bushing well is molded of a butyl material.
Claim 5
Dependent Claim
79 words
An instrument transformer having a body formed of insulating material and having the bushing well of claim 1 molded therein, the insulating material of said instrument transformer body surrounding substantially the entire outer surfaces of said bushing well and completely filling said groove between said first outer surface and said second outer surface locking said well into the body of said instrument transformer, and a cOnductor stud of said instrument transformer extending through said opening and into said well.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |