Gas-insulated switchgear

Claim 2

A gas-insulated switchgear forming a bus section unit comprising: two three-phase common enclosure type gas-insulated main buses each of which is firmly supported on a rigid support surface along substantially parallel straight lines in an installation area; one of the gas-insulated main buses being sectionalized into two gas-insulated main buses; the sectionalized gas-insulated main buses being arranged in line on the same axis; a circuit breaker for each phase of the three phases having a disconnecting switch at each terminal thereof; the circuit breakers being connected between the two sectionalized gas-insulated main buses; the circuit breakers being disposed by a side of the sectionalized gas-insulated main buses; and a shifted bus section formed at the end of one of the two sectionalized gas-insulated main buses; the shifted bus section being supported on the gas-insulated main bus; the shifted bus section being staggered from the other sectionalized gas-insulated main bus to form an axially overlapping bus structure; the shifted bus section being connected to the other sectionalized gas-insulated main bus via the circuit breaker and the disconnecting switches which are respectively mounted on the shifted bus section and the other sectionalized gas-insulated main bus.

Claim 3

A gas-insulated switchgear as set forth in claim 1, wherein the shifted bus section and one of the sectionalized gas-insulated main buses are linearly interconnected by a bus branch section which is disposed slantwise.

Claim 4

A gas-insulated switchgear as set forth in claim 1, wherein the shifted bus section and one of the sectionalized gas-insulated main buses are interconnected by a bus branch section which is formed substantially in the shape of an inverted letter L.

Claim 5

A gas-insulated switchgear as set forth in claim 1, wherein the bus section unit employs a vertical type circuit breaker.

Claim 6

A gas-insulated switchgear as set forth in claim 1, wherein the bus section unit employs a lateral type circuit breaker.

Claim 7

A gas-insulated switchgear as set forth in claim 1, wherein the shifted bus section leading from the first sectionalized gas-insulated main bus and the second sectionalized gas-insulated main bus together form the axially overlapping bus structure and each has a branch lead portion at top surfaces thereof the disconnecting switches are connected to the respective branch lead portions.

Claim 8

A gas-insulated switchgear as set forth in claim 1, wherein the disconnecting switches each are positioned a vessel which is cross-shaped when viewed from the side.

Claim 9

A gas-insulated switchgear forming a bus section unit comprising: two three-phase common enclosure type gas-insulated main buses firmly supported along two substantially parallel first and second straight lines at an installation area; the gas-insulated main bus on the first straight line being sectionalized into two gas-insulated main buses that are arranged in line on the same axis; a vertical type circuit breaker for each of said three phases each having an upper and a lower disconnecting switch at each terminal thereof; the circuit breakers being connected between the two sectionalized gas-insulated main buses; the circuit breakers being disposed by a side of the sectionalized gas-insulated main buses on the first straight line; and a shifted bus section formed at the end of one of the sectionalized gas-insulated main buses; the shifted bus section being supported on the gas-insulated main bus which is arranged along the second straight line located further than the first straight line from the circuit breakers; the shifted bus section being staggered from the other sectionalized gas-insulated main bus so that the shifted bus section and the other sectionalized main bus are disposed at different levels along their axes to form an axially overlapping bus structure; the shifted bus section being connected to the other sectionalized gas-insulated main bus via the circuit breaker and the disconnecting switches; the disconnecting switches being in upper and lower electrical paths that are connected to opposite ends of the circuit breaker.

Claim 10

A gas-insulated switchgear forming a bus section unit comprising: two three-phase common enclosure type gas-insulated main buses firmly supported along two substantially parallel first and second straight lines at an installation area; the gas-insulated main bus on the first straight line being sectionalized into two gas-insulated main buses that are arranged in line on the same axis; a vertical type circuit breaker for each of said three phases each having an upper and a lower disconnecting switch at each terminal thereof; the circuit breakers being connected between the two sectionalized gas-insulated main buses; the circuit breakers being disposed by a side of the sectionalized gas-insulated main buses on the first straight line; and a shifted bus section formed at the end of one of the sectionalized gas-insulated main buses; the shifted bus section being supported on the gas-insulated main bus which is arranged along the second straight line located further than the first straight line from the circuit breakers; the shifted bus section being staggered from the other sectionalized gas-insulated main bus so that the shifted bus section and the other sectionalized main bus are disposed at different levels along their axes to form an axially overlapping bus structure; the shifted bus section being connected to the other sectionalized gas-insulated main bus via the circuit breaker and the disconnecting switches; the disconnecting switches being in upper and lower electrical paths that are connected to opposite ends of the circuit breaker.

Claim 11

A gas-insulated switchgear as set forth in claim 8, wherein the shifted bus section and one of the sectionalized gas-insulated main buses are linearly interconnected by a bus branch section which is disposed slantwise.

Claim 12

A gas-insulated switchgear as set forth in claim 8, wherein the shifted bus section and one of the sectionalized gas-insulated main buses are interconnected by a bus branch section which is formed substantially in the shape of an inverted letter L.

Claim 13

A gas-insulated switchgear forming a bus section unit comprising: two three-phase common enclosure type gas-insulated main buses firmly supported along two substantially parallel first and second straight lines at an installation area; the gas-insulated main bus on the first straight line being sectionalized into two gas-insulated main buses that are arranged in line on the same axis; a lateral type circuit breaker for each of said three phases each having a disconnecting switch at each terminal thereof; the circuit breakers being connected between the two sectionalized gas-insulated main buses; the circuit breakers being supported on the installation area by a side of the sectionalized gas-insulated main buses on the first straight line; and a shifted bus section formed at the end of one of the two sectionalized gas-insulated main buses; the shifted bus section being supported on the gas-insulated main bus which is arranged along the second straight line located further than the first straight line from the circuit breakers; the shifted bus section being staggered from the other sectionalized gas-insulated main bus so that the shifted bus section and the other sectionalized main bus are disposed at different levels along their axes to form an axially overlapping bus structure; the shifted bus section being connected to the other sectionalized gas-insulated main bus via the circuit breaker and the disconnecting switches; the disconnecting switches being in electrical paths returning and passing over the circuit breaker and in an electrical path on the side of the gas-insulated main bus.

Claim 14

A gas-insulated switchgear forming a bus section unit comprising: two three-phase common enclosure type gas-insulated main buses firmly supported along two substantially parallel first and second straight lines at an installation area; the gas-insulated main bus on the first straight line being sectionalized into two gas-insulated main buses that are arranged in line on the same axis; a lateral type circuit breaker for each of said three phases each having a disconnecting switch at each terminal thereof; the circuit breakers being connected between the two sectionalized gas-insulated main buses; the circuit breakers being supported on the installation area by a side of the sectionalized gas-insulated main buses on the first straight line; and a shifted bus section formed at the end of one of the two sectionalized gas-insulated main buses; the shifted bus section being supported on the gas-insulated main bus which is arranged along the second straight line located further than the first straight line from the circuit breakers; the shifted bus section being staggered from the other sectionalized gas-insulated main bus so that the shifted bus section and the other sectionalized main bus are disposed at different levels along their axes to form an axially overlapping bus structure; the shifted bus section being connected to the other sectionalized gas-insulated main bus via the circuit breaker and the disconnecting switches; the disconnecting switches being in electrical paths returning and passing over the circuit breaker and in an electrical path on the side of the gas-insulated main bus.

Claim 15

A gas-insulated switchgear as set forth in claim 11, wherein the shifted bus section and one of the sectionalized gas-insulated main buses bus are linearly interconnected by a bus branch section which is disposed slantwise.

Claim 16

A gas-insulated switchgear as set forth in claim 11, wherein the shifted bus section and one of the sectionalized gas-insulated main buses or the first main bus are interconnected by a bus branch section which is formed substantially in the shape of an inverted letter L.

Claim 17

A gas-insulated switchgear forming a bus section unit comprising: two three-phase common enclosure type gas-insulated main buses firmly supported along two substantially parallel first and second straight lines at an installation area; the gas-insulated main bus on the first straight line being sectionalized into two gas-insulated main buses that are arranged in line on the same axis; a circuit breaker for each of said three phases each having a disconnecting switch at each terminal thereof; the circuit breakers being connected between the two sectionalized gas-insulated main buses; the circuit breakers being disposed by a side of the sectionalized gas-insulated main buses on the first straight line; and a shifted bus section formed at the end of one of the two sectionalized gas-insulated main buses; the shifted bus section being supported above the gas-insulated main bus which is arranged along the second straight line located further than the first straight line from the circuit breakers; the shifted bus section being staggered from the other sectionalized gas-insulated main bus to form an axially overlapping bus structure; the shifted bus section being connected to the other sectionalized gas-insulated main bus via the circuit breaker and the disconnecting switches; the disconnecting switches being inserted in electrical paths extending from opposite sides of the circuit breaker.

Claim 18

A gas-insulated switchgear forming a bus section unit comprising: two three-phase common enclosure type gas-insulated main buses firmly supported along two substantially parallel first and second straight lines at an installation area; the gas-insulated main bus on the first straight line being sectionalized into two gas-insulated main buses that are arranged in line on the same axis; a circuit breaker for each of said three phases each having a disconnecting switch at each terminal thereof; the circuit breakers being connected between the two sectionalized gas-insulated main buses; the circuit breakers being disposed by a side of the sectionalized gas-insulated main buses on the first straight line; and a shifted bus section formed at the end of one of the two sectionalized gas-insulated main buses; the shifted bus section being supported above the gas-insulated main bus which is arranged along the second straight line located further than the first straight line from the circuit breakers; the shifted bus section being staggered from the other sectionalized gas-insulated main bus to form an axially overlapping bus structure; the shifted bus section being connected to the other sectionalized gas-insulated main bus via the circuit breaker and the disconnecting switches; the disconnecting switches being inserted in electrical paths extending from opposite sides of the circuit breaker.

Claim 19

A gas-insulated switchgear as set forth in claim 14, wherein the shifted bus section and one of the sectionalized bus-insulated main buses are linearly interconnected by a bus branch section which is disposed slantwise.

Claim 20

A gas-insulated switchgear as set forth in claim 14, wherein the shifted bus section and one of the sectionalized gas-insulated main buses are interconnected by a bus branch section which is formed substantially in the shape of an inverted letter L.

Claim 21

A gas-insulated switchgear as set forth in claim 14, wherein the bus section unit employs vertical type circuit breakers.

Claim 22

A gas-insulated switchgear as set forth in claim 14, wherein the bus section unit employs lateral type circuit breakers.

Claim 23

A gas-insulated switchgear as set forth in claim 14, wherein the shifted bus section leading from the first sectionalized gas-insulated main bus and the second sectionalized gas-insulated main bus together from the axially overlapping bus structure and each has a branch lead portion at top surfaces thereof, and the disconnecting switches are connected to the respective branch lead portions.

Claim 24

A gas-insulated switchgear as set forth in claim 14, wherein each disconnecting switch is positional in a vessel which is cross-shaped when viewed from the side.

Claim 25

A gas-insulated switchgear forming a bus section unit comprising: two three-phase common enclosure type gas-insulated main buses firmly supported along two substantially parallel first and second straight lines at an installation area; the gas-insulated main bus on the first straight line being sectionalized into two gas-insulated main buses that are arranged in line on the same axis; a vertical type circuit breaker for each of the three phases having a disconnecting switch at each terminal thereof; the circuit breakers being connected between the two sectionalized gas-insulated main buses; the circuit breakers being disposed by a side of the sectionalized gas-insulated main buses on the first straight line; and a shifted bus section formed at the end of one of the two sectionalized gas-insulated main buses; the shifted bus section being supported above the gas-insulated main bus which is arranged along the second straight line located further than the first line from the circuit breakers; the shifted bus section being staggered from the other sectionalized gas-insulated main bus so that the shifted bus section and the other sectionalized main bus are disposed at different levels along their axes to form an axially overlapping bus structure; the shifted bus section being connected to the other sectionalized gas-insulated main bus via the vertical type circuit breaker and the disconnecting switches being in an upper electrical path and a lower electrical path and connected to opposite ends of the circuit breakers; the disconnecting switches each being located in a vessel shaped like a cross when viewed from the side.

Claim 26

A gas-insulated switchgear forming a bus section unit comprising: two three-phase common enclosure type gas-insulated main buses firmly supported along two substantially parallel first and second straight lines at an installation area; the gas-insulated main bus on the first straight line being sectionalized into two gas-insulated main buses that are arranged in line on the same axis; a vertical type circuit breaker for each of the three phases having a disconnecting switch at each terminal thereof; the circuit breakers being connected between the two sectionalized gas-insulated main buses; the circuit breakers being disposed by a side of the sectionalized gas-insulated main buses on the first straight line; and a shifted bus section formed at the end of one of the two sectionalized gas-insulated main buses; the shifted bus section being supported above the gas-insulated main bus which is arranged along the second straight line located further than the first line from the circuit breakers; the shifted bus section being staggered from the other sectionalized gas-insulated main bus so that the shifted bus section and the other sectionalized main bus are disposed at different levels along their axes to form an axially overlapping bus structure; the shifted bus section being connected to the other sectionalized gas-insulated main bus via the vertical type circuit breaker and the disconnecting switches being in an upper electrical path and a lower electrical path and connected to opposite ends of the circuit breakers; the disconnecting switches each being located in a vessel shaped like a cross when viewed from the side.

Claim 27

A gas-insulated switch gear forming a bus section unit comprising: two three-phase common enclosure type gas-insulated main buses, each enclosure being firmly supported on a rigid support surface along substantially parallel lines in an installation area; one of the main buses being sectionalized into two main buses which are arranged in line to have a common axis; means for electrically connecting together the sectionalized buses including a separate circuit breaker for each of said three phases with each breaker having a disconnecting switch associated with terminal thereof; the circuit breaker in each phase being connected between the two sectionalized main buses; each circuit breaker being disposed within an enclosure separately supported on said support surface area at a side of the enclosures for the sectionalized main buses; and a shifted bus section enclosure including one of said disconnecting switches for each phase, said shifted bus section being positioned at an end of one of the two sectionalized main buses; the shifted bus section enclosure being supported on the enclosure for the other of said main buses; the axis of the shifted bus section enclosure being substantially parallel to and off-set from the parallel line associated with said sectionalized main buses; the disconnecting switches associated with the shifted bus section being positioned along a side of the other of said two sectionalized main buses to form an axial overlapping relationship of the buses thereby shortening a switch gear dimension; the shifted bus section enclosure being connected to the other sectionalized main bus enclosure via the circuit breaker and its disconnecting switches that are in a separate enclosure for each phase.

Claim 28

A gas-insulated switch gear forming a bus section unit comprising: two three-phase common enclosure type gas-insulated main buses, each enclosure being firmly supported on a rigid support surface along substantially parallel lines in an installation area; one of the main buses being sectionalized into two main buses which are arranged in line to have a common axis; means for electrically connecting together the sectionalized buses including a separate circuit breaker for each of said three phases with each breaker having a disconnecting switch associated with terminal thereof; the circuit breaker in each phase being connected between the two sectionalized main buses; each circuit breaker being disposed within an enclosure separately supported on said support surface area at a side of the enclosures for the sectionalized main buses; and a shifted bus section enclosure including one of said disconnecting switches for each phase, said shifted bus section being positioned at an end of one of the two sectionalized main buses; the shifted bus section enclosure being supported on the enclosure for the other of said main buses; the axis of the shifted bus section enclosure being substantially parallel to and off-set from the parallel line associated with said sectionalized main buses; the disconnecting switches associated with the shifted bus section being positioned along a side of the other of said two sectionalized main buses to form an axial overlapping relationship of the buses thereby shortening a switch gear dimension; the shifted bus section enclosure being connected to the other sectionalized main bus enclosure via the circuit breaker and its disconnecting switches that are in a separate enclosure for each phase.