Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Patent
1988-02-08
1989-08-29
Tolin, Gerald P.
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
200 48R, H02B 120
Patent
active
048623199
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a gas-insulated switchgear and more specifically to a gas-insulated switchgear with a bus section unit used in substations.
BACKGROUND ART
As described in the electrical engineers' journal "Denki Kyodo Kenkyu" (Electrical Joint Research), volume 41, No. 5, page 67-68 and in the Japanese Utility Model Laid-Open No. 80616/1981, it is known that measures taken in substations to improve reliability of power systems include duplication of the main bus; sectionalizing the bus to make the sectioned buses individually operational and to provide a bus section unit to connect the sectioned buses; and providing a bus tie unit to connect parallel double buses and connecting feeder units between the double buses.
The above substation configuration is explained by referring to FIG. 1 which is a one-line diagram of the substation circuitry. The main bus 2 and the main buses 1 and 3 constitute a double bus scheme in which two parallel main buses are laid. The main buses 1 and 3, which together form one of the two parallel buses, are arranged in line on the same axis and are disconnectably connected with each other by a bus section unit S. The bus section unit S consists of a disconnecting switch 4b connected at one end to the main bus 1, another disconnecting switch 4a connected at one end to the main bus 3, and a circuit breaker 5 connected between these disconnecting switches. The parallel main buses 1 and 2 or buses 2 and 3 are connected by a bus tie unit T in such a way as to be disconnectable so that power can be interchanged between these buses. A feeder unit F is disconnectably connected between the main buses 1 and 2 or between the buses 2 and 3 to supply transformers and loads.
In the above configuration, for inspection or during failure of the main bus 3 which is connected to the main bus 1 through the bus section unit S, the circuit breaker 5 is operated, the disconnecting switches 4a, 4b are opened, and the bus tie section T is also operated so as to leave the remaining main buses 1 and 2 operational.
For application in substations with the above configuration, the Japanese Utility Model Laid-Open No. 80616/1981 shows the bus section unit S which is formed by a gas-insulated switchgear. In this example, two separated gas-insulated main buses arranged in line on the same axis on the installation area are connected by an auxiliary gas-insulated jointing bus which is located by the side of the opposing ends of the two aligned gas-insulated main buses. The gas-insulated main buses and the auxiliary gas-insulated jointing bus need be arranged parallelly. This increases the widthwise dimension, which in turn increases the installation area of the gas-insulated switchgear used as the bus section unit.
DISCLOSURE OF THE INVENTION
The object of this invention is to provide a gas-insulated switchgear forming a bus section unit which has a reduced installation area and an improved seismic resistance.
The gas-insulated switchgear of this invention which forms the bus section unit has the following configuration. Non-segregated 3-phase gas-insulated main buses are arranged in two almost parallel straight lines. On one of the two parallel lines and on the same axis are sectionalized gas-insulated main buses, by the side of which are arranged 3-phase circuit breakers. Of the gas-insulated main buses, the sectionalized gas-insulated main buses which are located closer to the circuit breaker than the third main bus on the second parallel line are interconnected by the bus section unit. One of the sectionalized gas-insulated main buses on the breaker side is provided with a shifted bus section which is disposed above the third gas-insulated main bus which is located farther from the circuit breaker. Through the shifted bus section, the sectionalized gas-insulated main bus is connected to the circuit breaker.
As mentioned above, the shifted bus section is provided to one of the two sectionalized gas-insulated main buses which are located near the circuit breaker. And the sh
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patent: 3823346 (1974-07-01), Olsen
patent: 4032820 (1977-06-01), Oishi
patent: 4493009 (1985-01-01), Lorenz
patent: 4503481 (1985-03-01), Fujiya
patent: 4638403 (1987-01-01), Amano
Sakaguchi Minoru
Suzuki Yoshirou
Suzuyama Hiroshi
Hitachi , Ltd.
Tolin Gerald P.
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