US5754382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas insulated switchgear and power transmission system using the switchgear
Assignee: Hitachi Ltd
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Filing: 1996-08-19
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Granted: 1998-05-19
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Expires: 2016-08-19
Abstract
Abstract A power transmission system includes a transmission line unit for three phases connected to three gas insulated transmission lines and a standby transmission line unit for a phase connected to a standby gas insulated transmission line connected with each other. A connection bus is provided at a branch part of each breaker in the transmission line unit for three phases, via the breaker. The connection bus is connected to a branch bus provided between the breaker in the transmission line unit of a gas insulated switch gear for three phases and the main buses, and to the standby transmission line unit.
Inventors
- 👤 Takanobu Aoyama
- 👤 Tadasuke Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:12
CPC Classifications
H; H02; H02B; H02B1/00; H02B1/20; H02B1/22; H02B5/00; H02B5/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
170 words
A power transmission system having gas insulated transmission lines for connecting two stations of substations/switching stations, and a gas insulated switchgear installed in each of said two stations and connected to said gas insulated transmission lines, said transmission system comprising: a channel of gas insulated transmission lines for three phases; a standby channel of a gas insulated transmission line for one phase; a transmission line unit in a gas switchgear including three sets of breakers and disconnectors for three phases, provided for said channel of gas insulated transmission lines for three phases; and a standby transmission line unit in a standby gas switchgear, including three sets of breakers and disconnectors for three phases, provided for said standby channel of a gas insulated transmission line for a phase; wherein three lines for three phases branched from three lines connected to said channel of gas insulated transmission lines for three phases, by using a branch bus, are combined into one line and connected to said standby channel via said standby transmission unit.
Claim 2
Dependent Claim
170 words
A power transmission system having gas insulated transmission lines for connecting two stations of substations/switching stations, and a gas insulated switchgear installed in each of said two stations and connected to said gas insulated transmission lines, said transmission system comprising: a channel of gas insulated transmission lines for three phases; a standby channel of a gas insulated transmission line for one phase; a transmission line unit in a gas switchgear including three sets of breakers and disconnectors for three phases, provided for said channel of gas insulated transmission lines for three phases; and a standby transmission line unit in a standby gas switchgear, including three sets of breakers and disconnectors for three phases, provided for said standby channel of a gas insulated transmission line for a phase; wherein three lines for three phases branched from three lines connected to said channel of gas insulated transmission lines for three phases, by using a branch bus, are combined into one line and connected to said standby channel via said standby transmission unit.
Claim 3
Dependent Claim
119 words
A power transmission system according to claim 1, further including protection relays provided at said channel of gas insulated transmission lines, wherein the opening operation of a breaker, corresponding to a failed phase in the channel, in said transmission line unit of the channel of gas insulated transmission lines for three phases is controlled, based on a failure detection signal for said failed phase sent from one of said protection relays, and the closing operation of a breaker, corresponding to said failed phase, in said transmission line unit of said standby channel of a gas insulated transmission line, is also controlled, based on said failure detection signal for said failed phase sent from said one of said protection relays.
Claim 4
Dependent Claim
19 words
A power transmission system according to claim 1, wherein said branch bus comprises a three phase common enclosed bus.
Claim 5
Dependent Claim
20 words
A power transmission system according to claim 1, wherein said branch bus comprises three pieces of single phase connected buses.
Claim 6
Dependent Claim
39 words
A power transmission system according to claim 4, wherein each of said disconnectors of said transmission line unit for said standby channel for a phase is provided at the same location as each of said single phase connected buses.
Claim 7
Dependent Claim
54 words
A power transmission system according to claim 1, wherein said channel of transmission lines for three phases are connected to main buses via said disconnectors provided at a side of said main buses, and said branch bus is provided between said disconnectors provided at said side of said main buses and said main buses.
Claim 8
Dependent Claim
158 words
A gas insulated switchgear installed in each of substations/switching stations and connected to gas insulated transmission lines for connecting two stations of said substations/said switching stations, said gas insulated switchgear comprising: a first transmission line unit including three sets, each set including one breaker and disconnectors, for three phases, provided in a channel of gas insulated transmission lines for three phases; and a second transmission line unit including three sets, each set including one breaker and disconnectors for, three phases, provided in a standby channel of a gas insulated transmission line for a phase; wherein said first and second transmission line units are connected to each other by using a branch bus, and a transmission line corresponding to a failed phase in said channel of gas insulation lines for three phases is switched to said standby channel of a gas insulated transmission line for a phase, via said second transmission line unit in each of said two stations.
Claim 9
Dependent Claim
158 words
A gas insulated switchgear installed in each of substations/switching stations and connected to gas insulated transmission lines for connecting two stations of said substations/said switching stations, said gas insulated switchgear comprising: a first transmission line unit including three sets, each set including one breaker and disconnectors, for three phases, provided in a channel of gas insulated transmission lines for three phases; and a second transmission line unit including three sets, each set including one breaker and disconnectors for, three phases, provided in a standby channel of a gas insulated transmission line for a phase; wherein said first and second transmission line units are connected to each other by using a branch bus, and a transmission line corresponding to a failed phase in said channel of gas insulation lines for three phases is switched to said standby channel of a gas insulated transmission line for a phase, via said second transmission line unit in each of said two stations.
Claim 10
Dependent Claim
25 words
A gas insulated switchgear according to claim 7, wherein said branch bus in said second transmission line unit is a three phase common enclosed bus.
Claim 11
Dependent Claim
26 words
A gas insulated switchgear according to claim 7, wherein said branch bus in said second transmission line unit comprises three pieces of single phase connected buses.
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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) | 2001-05-18 | 2001-11-17 | 2002-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-18 | 2005-11-17 | 2006-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-18 | 2009-11-17 | 2010-05-19 | $7700.00 | Window Closed / Lapsed |