Patent US3903387A successfully refreshed from Google Patents.
US3903387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas-insulated switching apparatus
Assignee: Hitachi Ltd
•
Filing: 1974-05-15
•
Granted: 1975-09-02
•
Expires: 1994-05-15
Abstract
Abstract A gas-insulated switching apparatus comprising a breaking section having at least a couple of mutually detachable contacts, a grounded tank containing the breaking section and filled with an insulating gas, the grounded tank being maintained at earth potential, bushings provided on both sides of the grounded tank, bushing tanks which are provided at the lower side of the bushings for supporting the bushings and filled with an insulating gas, and a disconnecting section provided at least in the current paths between the breaking section and at least one of the bushings. An end of the grounded tank is connected with a lead section on the side wall of the tank provided at the lower side of the bushings, and the grounded on the same straight line at the bushing tanks provided at the lower side of the bushings.
Inventors
- 👤 Kohji Sasaki
- 👤 Seizo Nakano
- 👤 Tuneo Kishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:33
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
116 words
A gas-insulated switching apparatus comprising a breaker section with at least a couple of mutually detachable contacts, a grounded tank containing said breaker section and filled with an insulating gas, said grounded tank being maintained at earth potential, a couple of bushings arranged on both sides of said grounded tank, said bushings and said grounded tank being arranged in a straight line, a couple of bushing tanks mounted under said bushings and filled with an insulating gas, said bushing tanks having leads on the side walls thereof for being connected to the ends of said grounded tank, and a disconnecting switch in the current path between said breaker section and at least one of said bushings.
Claim 2
Dependent Claim
116 words
A gas-insulated switching apparatus comprising a breaker section with at least a couple of mutually detachable contacts, a grounded tank containing said breaker section and filled with an insulating gas, said grounded tank being maintained at earth potential, a couple of bushings arranged on both sides of said grounded tank, said bushings and said grounded tank being arranged in a straight line, a couple of bushing tanks mounted under said bushings and filled with an insulating gas, said bushing tanks having leads on the side walls thereof for being connected to the ends of said grounded tank, and a disconnecting switch in the current path between said breaker section and at least one of said bushings.
Claim 3
Dependent Claim
25 words
A gas-insultaed switching apparatus according to claim 1, in which said bushings are supported by means of Said bushing tank independently of said grounded tank.
Claim 4
Dependent Claim
19 words
A gas-insulated switching apparatus according to claim 1, in which said disconnecting switch is provided within said bushing tank.
Claim 5
Dependent Claim
40 words
A gas-insulfaed switching apparatus according to claim 1, in which an insulating spacer for separating said insulating gas in said grounded tank from said insulating gas in said bushing tank is interposed between said grounded tank and said bushing tank.
Claim 6
Dependent Claim
29 words
A gas-insulated switching apparatus according to claim 4, in which said insulating spacer supports a fixed member of said disconnecting switch and a fixed contact of said disconnecting switch.
Claim 7
Dependent Claim
51 words
A gas-insulated switching apparatus according to claim 2, in which the bracket of said disconnecting switch is supported on an insulating support cylinder arranged within said bushing tank and a movable member of said disconnecting switch is operated through an insulating rod provided through the inner space of said insulating cylinder.
Claim 8
Dependent Claim
39 words
A gas-insultaed switching apparatus according to claim 1, in which a bellows contractible axially of said circuit breaker is interposed between a flange mounted on an axial end of said grounded tank and a lead of said bushing tank.
Claim 9
Dependent Claim
167 words
A gas-insulated switching apparatus comprising at least one breaker section unit including a breaker section with at least a couple of mutually detachable contacts and a grounded tank containing said breaker section and filled with an insulating gas, said grounded tank being maintained at earth potential and having an axial end hermetically sealed by an insulating spacer to which a fixed member at the axial end of said breaker section is fastened; and a plurality of bushing units each including a bushing and a bushing tank for supporting said bushing, each of said bushing tanks having leads on the sides of said bushing tanks, one of said leads being adapted to engage said grounded tank of said breaker section unit, said bushing unit having a disconnecting switch formed therein; at least one breaker section unit being combined with a plurality of bushing units each couple of which is arranged on both sides of said breaker section unit, all of said units being arranged in a straight line.
Claim 10
Dependent Claim
167 words
A gas-insulated switching apparatus comprising at least one breaker section unit including a breaker section with at least a couple of mutually detachable contacts and a grounded tank containing said breaker section and filled with an insulating gas, said grounded tank being maintained at earth potential and having an axial end hermetically sealed by an insulating spacer to which a fixed member at the axial end of said breaker section is fastened; and a plurality of bushing units each including a bushing and a bushing tank for supporting said bushing, each of said bushing tanks having leads on the sides of said bushing tanks, one of said leads being adapted to engage said grounded tank of said breaker section unit, said bushing unit having a disconnecting switch formed therein; at least one breaker section unit being combined with a plurality of bushing units each couple of which is arranged on both sides of said breaker section unit, all of said units being arranged in a straight line.
Claim 11
Dependent Claim
27 words
A gas-insulated switching apparatus according to claim 8, comprising four bushing units arranged in a straight line and said breaker section units arranged between said bushing units.
Claim 12
Dependent Claim
90 words
A gas-insulated switching apparatus according to claim 8, comprising three of said bushing units arranged in a straight line, a breaker section unit interposed between the central one of said bushing units and one of the remaining bushing units, and a connecting conductor unit interposed between said central bushing unit and the other of said remaining bushing units, said connecting conductor unit having a casing containing a central conductor, said casing being filled with an insulating gas and having an end adapted to engage the lead of said bushing tank.
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) | 1978-09-01 | 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 |