JP5547694B2 - Gas insulated switchgear - Google Patents

Description

  The present invention relates to a gas-insulated switchgear, and more particularly, a 1/1/2 circuit breaker type gas insulation system in which three horizontal breakers are connected in series and connected between two main buses. The present invention relates to a switchgear (hereinafter abbreviated as “GIS”).

In general, since GIS can greatly reduce the installation area and has high reliability, it is currently used in substations in many transmission and distribution systems. Each apparatus in GIS uses a sealed container enclosing an insulating gas such as SF _6, respectively. For example, the circuit breaker has a circuit breaker in a sealed container, the circuit breaker has a circuit break in the airtight container, and each bus such as the main bus has a bus conductor in the airtight container. Other devices, such as current collectors, ground switches and lightning arresters, are similarly configured.

  The GIS used in the substation will be described with reference to the simplified single-line connection diagram of FIG. 5. Three breakers CB1 that connect the two main buses Bus1 and Bus2 in series with the connection buses 11 and 12 in order. , CB2 and CB3 are electrically connected by connection buses 13 and 14. The circuit breakers CB1, CB2, and CB3 are connected in series with the disconnecting switches DS1 and DS2, DS3, DS4, DS5, DS6, and the like with ground switches on both sides. Further, branch buses 15 and 16 are connected to connection buses 11 and 12 between the two circuit breakers CB1 and CB2 and between CB2 and CB3, and insulation terminals Bg1 and Bg2 such as cable heads and bushings are connected to the branch buses 15 and 16. Provided. This constitutes a so-called 1/1/2 circuit breaker type GIS.

  In the case of the above-mentioned 1 · 1/2 circuit breaker type GIS, each device is configured in an arrangement substantially corresponding to a single-line diagram. That is, the two main bus bars extending in the axial direction are arranged substantially parallel to the installation surface at a predetermined distance, and three horizontal breakers are arranged linearly in the space between the main bus lines, and They are connected in series using a connection bus.

  Each branch bus connected to the connection bus between the circuit breakers is arranged using the space above one main bus and the other main bus so as to reach the insulated terminal. In this arrangement configuration, the arrangement of the main buses and the three horizontal breakers and the branch buses are such that both axes intersect when viewed from above. This constitutes a GIS unit, also called a diagram for one line, in the 1/1/2 circuit breaker system shown in the single-line connection diagram of FIG. 5, and GIS units for multiple lines are connected between two main buses. It can be arranged.

  However, the 1/1/2 circuit breaker type GIS configured by the arrangement of the GIS units described above requires a distance between two main busbars so that three horizontal circuit breakers can be arranged. A unit of rectangular area must be secured per unit. For this reason, there is a problem that an extremely large installation area is required in an ultra-high voltage substation composed of multi-line GIS units arranged in the axial direction of the main bus.

  For this reason, for example, Patent Document 1 proposes an arrangement configuration in which the installation area can be further reduced and maintenance inspection work of a horizontal type circuit breaker can be easily performed even in the case of a 1/1/2 circuit breaker type GIS. Yes. Since the GIS of Patent Document 1 constitutes a GIS unit for two lines connected in parallel, a series connection body in which three horizontal breakers are connected in series in parallel with the longitudinal direction between two main buses. Two sets are arranged, connected in series with connection buses arranged above, and each branch bus connected to the upper part of each connection bus is arranged so as to be drawn out in a direction intersecting with the main bus. In both GIS units for two lines, each main bus and three series-connected circuit breakers are arranged in parallel.

JP 2007-202390 A

  In the GIS arrangement configuration of Patent Document 1, it is necessary to secure a space for facilitating maintenance and inspection work of the horizontal breaker constituting the GIS unit for two lines, and the interval between the horizontal breakers is one. And a structure in which branch buses for each line are drawn out from a wide interval, and auxiliary buses are arranged at both ends of the series connection body of the horizontal type circuit breaker to be connected in parallel with the main bus bar.

  For this reason, the installation area of the whole GIS still becomes large, and there exists a fault which must secure a big GIS building and a substation site. Also, if the circuit breaker needs to be repaired extensively, the circuit breaker located at both ends of the series connection body can be removed and carried out relatively easily, but the circuit breaker located at the center of the series connection body There is a problem that the removal and carry-out work becomes large-scale.

  An object of the present invention is to provide a 1/1/2 circuit breaker type GIS in which the installation site area can be further reduced and a work space for maintenance and inspection can be sufficiently secured.

The present invention includes two main busbars extending in the axial direction, three horizontal circuit breakers connected in series connected to the main busbars, and disconnectors provided on both sides of the horizontal circuit breakers. A connection bus for connecting the main bus and the horizontal breaker with the disconnector interposed therebetween, and a branch bus for connecting one end to the connection bus and providing an insulating terminal on the other end. 1/1/2 circuit breaker type gas insulated switchgear provided at least, wherein each of the horizontal breakers is arranged in parallel using a sealed container provided with a connection opening facing upward, and the main busbar Are arranged in two upper and lower stages in the space above one end side in the axial direction of each horizontal breaker, and the connecting bus is located in the space above the other end side in the axial direction of the horizontal breaker. Arranged in two upper and lower stages, the branch bus is located above the connection bus Both continued to, and wherein each connection busbar and each of the main busbar is characterized by being configured substantially parallel to the same height which are symmetrical about the said horizontal-type circuit breaker.

  Preferably, each branch bus is arranged in an upper space of the horizontal breaker and pulled out to the main bus, or each branch bus is arranged in an upper space of the connection bus. It is characterized by being drawn out to the side opposite to the side.

  According to the GIS of the present invention, each horizontal type circuit breaker using a sealed container provided with a connection opening directed upward is provided side by side, and the upper space of these one end side and the other end side In addition, since each main bus and connection bus are arranged in two upper and lower stages, and each branch bus is also arranged above each connection bus, the distance between the main bus and the connection bus can be shortened compared to the prior art. Since the arrangement of the present invention can be about 65% as compared with the arrangement area of GIS, the installation site area of GIS can be further reduced.

  In addition, a large space is formed at each end side of each horizontal breaker below each main bus and connection bus, so this space is used as a work space for horizontal breakers and main buses. Therefore, it can be used effectively during dismantling and maintenance inspection of each device.

1 is a schematic plan view of a 1 · 1/2 circuit breaker type GIS which is an embodiment of the present invention. FIG. It is a schematic side view along the AA line of FIG. It is a schematic side view along the BB line of FIG. It is a schematic side view along the CC line of FIG. FIG. 2 is a simplified single line connection diagram of a 1 · 1/2 circuit breaker type GIS.

  The 1 · 1/2 circuit breaker type GIS of the present invention includes two main busbars extending in the axial direction, three horizontally installed type circuit breakers connected in series with the main busbars, and each horizontal type A disconnecting switch provided on both sides of the circuit breaker, a connecting bus connecting the main bus and the horizontal type circuit breaker with the disconnecting switch interposed therebetween, one end connected to each connecting bus and the other end And at least a branch bus provided with an insulating terminal. Horizontally installed circuit breakers using a sealed container having a connection opening at the top are arranged side by side, and each main busbar is vertically moved in the upper space on one end side in the axial direction of each horizontally mounted circuit breaker. In addition to being arranged in stages, the connecting bus bars are arranged in two upper and lower stages in the space above the other end side in the axial direction of each horizontal breaker. Further, the branch buses are arranged and connected above the connection buses.

  Hereinafter, the 1/1/2 circuit breaker type GIS of the present invention will be described with reference to FIGS. 1 to 4 indicated by the same reference numerals as those in the connection diagram of FIG. The horizontal type circuit breakers CB1 to CB3 used in the GIS of the present invention use a sealed container 20 that is long in the axial direction provided with connection openings 22a and 22b facing upward, and a blocking part 21 is provided inside the sealed container 20. And is filled with an insulating gas. In the example of FIG. 1, since it is a phase separation type, the horizontal type circuit breakers CB1, CB2, and CB3 are arranged in parallel, each having three phases. Note that the connection openings 22 a and 22 b facing upward can be used by being provided at each end of the sealed container 20 in the axial direction.

  These side-by-side circuit breakers CB1 to CB3 are provided with two main buses Bus1 and Bus2 extending in the axial direction in two upper and lower stages in the upper space on one end side in the axial direction. In the upper space on the other end side in the axial direction of the horizontal type circuit breakers CB1 to CB3, connection buses 11 and 12 for connecting the circuit breakers are arranged in two upper and lower stages.

  Each of the horizontal type circuit breakers CB1 to CB3 is provided with disconnectors DS1, DS2, DS3, DS4, DS5, DS6 on both upper sides, and directly or on the connection openings 22a, 22b side of the sealed container 20. As shown in FIG. 2 to FIG. 4, they are connected using auxiliary buses 11c, 11d and 14a for adjusting the connection length.

  Between the horizontal breakers CB1 and CB2 and between CB2 and CB3, as shown in FIG. 2 and FIG. 3, the disconnector DS2 is connected using the connection bus 11 and the auxiliary buses 11a and 11b for adjusting the connection length. And DS3 are connected. Further, between the horizontal breakers CB2 and CB3, as shown in FIG. 3 and FIG. 4, the connection buses 12 and the auxiliary buses 12a and 12b for adjusting the connection length are used as shown in FIGS. Is connected. Further, the main bus Bus1 and the horizontal breaker CB1 and the main bus Bus2 and the horizontal breaker CB3 are connected using connection buses 13 and 14, respectively, as shown in FIGS.

  The branch buses 15 and 16 are arranged above the connection buses 11 and 12, and both of them are connected directly or via a disconnector as necessary. These branch buses 15 and 16 extend along the axis above the horizontal breakers CB2 and CB3 as shown in FIGS. 1, 3 and 4, respectively, and intersect the main buses Bus1 and Bus2 as viewed from above. In other words, it is pulled out substantially orthogonally. When these branch buses 15 and 16 become longer in the pull-out direction, they are naturally manufactured in a predetermined axial dimension in consideration of transportation and assembly work, and are used after being connected.

  As described above, when the upper side of the horizontal type circuit breakers CB2 and CB3 is utilized for the arrangement of the branch buses 15 and 16, the GIS can be configured to be reduced in the axial direction of the main bus. The branch buses 15 and 16 can be drawn not only to the main buses Bus1 and Bus2 but also to the opposite side of the main buses Bus1 and Bus2 on the left side of FIGS. 3 and 4 according to the installation conditions of the GIS. .

  The GIS of the present invention constitutes a GIS unit for one line of the 1/1/2 circuit breaker system by the above arrangement and each connection. Thereby, working spaces S1 and S4 are formed on the lower side of the main buses Bus1 and Bus2 and the connection buses 11 and 12 arranged in the upper and lower two stages, that is, on one side and the other end side of the horizontal breaker CB1. . Similarly, work spaces S2 and S5 are formed on one side and the other end side of the horizontal breaker CB2, and work spaces S3 and S6 are formed on one and the other end sides of the horizontal breaker CB3, respectively. Yes. These working spaces S1 to S6 can be utilized for work such as maintenance inspection and dismantling of each horizontal breaker. In addition, if each work space S1-S6 is made larger than the axial direction dimension of the airtight container 20 of each horizontal breaker CB1-CB3, workability | operativity can be improved further.

  In the example of the GIS unit shown in FIGS. 1 to 4 of the present invention, the main buses Bus1 and Bus2 and the connection buses 11 and 12 are vertically moved at the same height when viewed from the position centered on the horizontal breakers CB1 to CB3. They are arranged approximately in parallel so as to be symmetrical in two stages. When arranged in this manner, components such as each disconnector, each connection bus, and each auxiliary bus can be shared, so that the GIS can be easily manufactured economically. Further, if the mechanical buses including the main buses Bus1 and Bus2 and the connection buses 11 and 12 and the branch buses 15 and 16 are arranged in two stages, the earthquake resistance is not impaired. Can be configured.

  The 1/1/2 circuit breaker type GIS of the present invention has horizontal circuit breakers CB1 to CB3, symmetrical main buses Bus1 and Bus2 and connection buses 11 and 12 and branch buses arranged in two upper and lower stages. Since 15 and 16 are appropriately arranged and connected, the installation area of the GIS can be reduced. Specifically, the GIS unit configuration for one line can be reduced to about 65% when compared with the conventional installation area and about 80% when compared with the volume ratio. Therefore, it is even more effective when the GIS is arranged in the building.

  When a GIS is configured with GIS units for two lines used in parallel connection, the same configuration as the GIS unit in FIG. 1 is arranged on either the left or right side of the main bus extending in the axial direction, It can be configured by connecting the main buses of both GIS units. Further, when the GIS is configured with GIS units for four lines, for example, if the GIS units for two lines connected in parallel are arranged symmetrically, the arrangement can be further reduced.

Bus1, Bus2 ... main bus, CB1, CB2, CB3 ... horizontal circuit breaker, DS1, DS2, DS3, DS4, DS5, DS6 ... disconnector, 11, 12 ... connecting bus, 15, 16 ... branch bus.

Claims (3)

Two main busbars extending in the axial direction, three horizontally installed circuit breakers connected in series with each main busbar, disconnectors provided on both sides of each horizontally installed circuit breaker, and the disconnectors 1 having at least a connecting bus for interposing the main buses and the horizontal breaker interposed therebetween, and a branch bus for connecting one end to each connecting bus and providing an insulating terminal on the other end In the 1/2 circuit breaker type gas-insulated switchgear, the horizontal breakers are juxtaposed using a sealed container provided with a connection opening facing upward, and the main bus bar is the horizontal breaker Two upper and lower stages are arranged in the upper space above one end side in the axial direction of the circuit breaker, and the connecting bus is arranged in two upper and lower stages in the space above the other end side in the axial direction of the horizontal breaker. , the branch bus connects arranged above the connection bus, or Wherein both of said respective connecting bus bars and each of the main busbar, the gas insulated switchgear, characterized in that configured by substantially parallel to the same height which are symmetrical about the said horizontal-type circuit breaker.   2. The gas insulated switchgear according to claim 1, wherein each branch bus is arranged in an upper space of the horizontal breaker and pulled out to the main bus.   2. The gas insulated switchgear according to claim 1, wherein each branch bus is arranged in a space above the connection bus and is drawn out to the side opposite to the main bus.

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