US3903441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lead box for dynamoelectric machines
Assignee: Westinghouse Electric Corp
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Filing: 1974-05-15
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Granted: 1975-09-02
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Expires: 1994-05-15
Abstract
Abstract A lead box is provided by dynamoelectric machines, such as large turbine generators, which includes shielding means within the lead box for shielding the generator leads in a manner to eliminate stray magnetic fluxes. Preferably, the shields are cylindrical structures arranged concentrically with the leads to maintain a symmetrical field within the shields, and current transformers associated with the leads are disposed inside the shields.
Inventors
- 👤 Raymond A Towne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:36
CPC Classifications
H; H02; H02K; H02K11/00; H02K11/0094; H01; H01B; H01B17/00; H01B17/26; H01B17/28; H02K11/01; H02K11/014; H02K11/0141; H02K11/40; H02K5/00; H02K5/04; H02K5/22; H02K5/225
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
74 words
In a three-phase dynamoelectric machine having a frame and three pairs of leads extending outwardly from the frame, each of said pairs comprising a line lead and a neutral lead, an enclosure for said leads attached to the frame, a terminal bushing for each lead supported on the enclosure, said enclosure including conductive shielding means enclosing each pair of leads, and at least one current transformer associated with each lead inside said shielding means.
Claim 2
Dependent Claim
74 words
In a three-phase dynamoelectric machine having a frame and three pairs of leads extending outwardly from the frame, each of said pairs comprising a line lead and a neutral lead, an enclosure for said leads attached to the frame, a terminal bushing for each lead supported on the enclosure, said enclosure including conductive shielding means enclosing each pair of leads, and at least one current transformer associated with each lead inside said shielding means.
Claim 3
Dependent Claim
25 words
The combination defined in claim 1 in which the shielding means of each pair of leads is generally cylindrical and substantially concentric with the leads.
Claim 4
Dependent Claim
100 words
A terminal structure for a polyphase dynamoelectric machine having leads extending from a frame, said structure comprising an enclosure attached to said frame and enclosing said leads, the leads being disposed in pairs each consisting of a line lead and a neUtral lead, a terminal bushing for each lead supported on the enclosure, shielding means within the enclosure for each pair of leads, each of said shielding means comprising a generally cylindrical conducting structure enclosing a pair of leads and disposed substantially concentrically therewith, and at least one current transformer associated with each lead and disposed inside the shielding means.
Claim 5
Dependent Claim
100 words
A terminal structure for a polyphase dynamoelectric machine having leads extending from a frame, said structure comprising an enclosure attached to said frame and enclosing said leads, the leads being disposed in pairs each consisting of a line lead and a neUtral lead, a terminal bushing for each lead supported on the enclosure, shielding means within the enclosure for each pair of leads, each of said shielding means comprising a generally cylindrical conducting structure enclosing a pair of leads and disposed substantially concentrically therewith, and at least one current transformer associated with each lead and disposed inside the shielding means.
Claim 6
Dependent Claim
197 words
A terminal structure for a polyphase dynamoelectric machine having leads extending from a frame, said structure comprising an enclosure attached to said frame and enclosing said leads, the leads being disposed in pairs each consisting of a line lead and a neutral lead, a terminal bushing for each lead supported on the enclosure, shielding means within the enclosure for each pair of leads, each of said shielding means comprising a generally cylindrical conducting structure enclosing a pair of leads and disposed substantially concentrically therewith, and the leads of each pair having first spaced parallel portions attached to said terminal bushings and second parallel portions more closely spaced than said first portions and extending into the frame, with intermediate portions joining the first and second portions of each lead substantially at right angles thereto, and the shielding means for each pair of leads comprising a first cylindrical portion surrounding each of the first portions of the leads concentrically therewith and an intermediate cylindrical portion joining the first cylindrical portions of the shielding means, said intermediate portion surrounding the intermediate portions of the leads concentrically therewith and having an opening for passage of the second portions of the leads.
Claim 7
Dependent Claim
197 words
A terminal structure for a polyphase dynamoelectric machine having leads extending from a frame, said structure comprising an enclosure attached to said frame and enclosing said leads, the leads being disposed in pairs each consisting of a line lead and a neutral lead, a terminal bushing for each lead supported on the enclosure, shielding means within the enclosure for each pair of leads, each of said shielding means comprising a generally cylindrical conducting structure enclosing a pair of leads and disposed substantially concentrically therewith, and the leads of each pair having first spaced parallel portions attached to said terminal bushings and second parallel portions more closely spaced than said first portions and extending into the frame, with intermediate portions joining the first and second portions of each lead substantially at right angles thereto, and the shielding means for each pair of leads comprising a first cylindrical portion surrounding each of the first portions of the leads concentrically therewith and an intermediate cylindrical portion joining the first cylindrical portions of the shielding means, said intermediate portion surrounding the intermediate portions of the leads concentrically therewith and having an opening for passage of the second portions of the leads.
Claim 8
Dependent Claim
31 words
The combination defined in claim 4 and including at least one current transformer associated with each lead, the current transformers being disposed within the first cylindrical portions of the shielding means.
Claim 9
Dependent Claim
38 words
The combination defined in claim 4 in which the shielding means of all the pairs of leads are electrically connected together at the ends of the first cylindrical portions of the shielding means remote from the intermediate portions.
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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) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |