JP5783941B2 - Gas insulated switchgear - Google Patents

Description

  Embodiments described herein relate generally to a gas-insulated switchgear in which improvements are made to the arrangement of a circuit breaker unit, a drawer circuit unit, and a main bus.

  The gas insulated switchgear is configured by filling a sealed container with a gas excellent in insulation and arc extinguishing, storing a circuit breaker, a disconnector, etc. in the sealed container, and combining devices such as a main busbar. Has been. This type of switchgear is easier to miniaturize than an air-insulated switchgear. Among these, a gas insulated switchgear in which a plurality of devices are unitized can exhibit excellent compactness.

  In recent years, it has been desired to reduce the construction site for substations against the background of rising land prices. Therefore, gas insulated switchgear excellent in miniaturization is frequently used in substations. Furthermore, recent substations are known that include an indoor gas insulated switchgear building. Therefore, the building area of the gas insulated switchgear tends to be severely restricted. As a result, further downsizing of the gas insulated switchgear is required.

  Hereinafter, a gas insulated switchgear including a circuit breaker unit including a circuit breaker and a drawer circuit unit including an external power receiving terminal will be described with reference to FIG. FIG. 10 is a typical single line connection diagram of the gas insulated switchgear. As shown in FIG. 10, a total of 20 units are arranged in the gas insulated switchgear, with a plurality of devices as one unit. The breakdown of the 20 units is 12 circuit breaker units 5-16 and 8 drawer circuit units 17-24.

  In addition, the 20 units are divided into four upper units 1 to 4 with five unit groups including three circuit breaker units and two drawer circuit units as one upper unit. These upper units 1 to 4 form one unit and are connected to the first and second main buses 25 and 26.

  The circuit breaker unit includes a gas circuit breaker 27, instrument current transformers 28 and 29, and disconnectors 30 and 31 with main bus grounding switches. The drawer circuit unit includes a disconnector 32 with a ground switch, a ground switch 33 for a drawer circuit, an instrument transformer 34, an external power receiving terminal 35, and a connection bus 36. Examples of the external power receiving terminal 35 include a cable terminal unit and a bushing.

  Next, with reference to FIG. 11, the arrangement of the entire gas-insulated switchgear will be described. As shown in FIG. 11, the upper units 1 to 4 are arranged in the left-right direction in FIG. 11, and are arranged apart from each other by a certain distance. The unit axis of each unit, which is a component of the upper units 1 to 4 (the connection axis of the devices constituting the unit), extends in the left-right direction in FIG. Further, the unit axis of each unit is on the same axis in the upper units 1 to 4 and is arranged in parallel to each other.

  The main buses 25 and 26 are both disposed outside the upper units 1 to 4 (the first main bus 25 is the lower side in FIG. 11 and the second main bus 26 is the upper side in FIG. 11). These main buses 25 and 26 are arranged parallel to each other along the left-right direction of FIG.

  Further, connection buses 37 and 38 with a horizontal connection axis are attached to the main buses 25 and 26 with a predetermined interval. Among these, the circuit breaker units 5, 8, 11, and 14 are connected to the first main bus 25 via the connection bus 37. The circuit breaker units 7, 10, 13, and 16 are connected to the second main bus 26 via the connection bus 38.

  Further, in the conventional example shown in FIG. 11, bushings 39 and 40 are connected to the drawing circuit units 21 and 22 of the upper unit 3 via L-shaped connection buses 45 and 46. The bushing 40 is disposed outside the first main bus 25 (the lower side in FIG. 11), and the bushing 39 is disposed outside the second main bus 26 (the upper side in FIG. 11).

  The positional relationship between the drawer circuit units 21 and 22 to which the bushings 39 and 40 are connected is that the unit 21 is on the lower side in FIG. 11 and the unit 22 is on the upper side in FIG. At this time, the bushing 39 connected to the unit 21 on the lower side of FIG. 11 is located on the upper side of FIG. 11, and the bushing 40 connected to the unit 22 on the upper side of FIG. Therefore, the connection buses 45 and 46 connecting the units 21 and 22 and the bushings 39 and 40 are L-shaped and are arranged so as to cross each other.

JP 05-130717 A

  However, the following problems have been pointed out in the gas insulated switchgear shown in FIG. That is, the upper units 1 to 4 are sufficiently long in the vertical direction in FIG. 11 because the five units are arranged in the vertical direction in FIG. Moreover, in the conventional example of FIG. 11, the main buses 25 and 26 are arranged on both sides of the upper units 1 to 4. Further, since the main buses 25 and 26 have the ground switches 41 and 43 and the instrument transformers 42 and 44, the main buses 25 and 26 swell in the vertical direction in FIG. Therefore, the width dimension W of the gas insulated switchgear of FIG. 11 is large. As a result, the building area of the equipment has been increased, and the construction area of the substation has been increased.

  Further, in the conventional example of FIG. 11, the connection buses 45 and 46 connecting the bushings 39 and 40 and the drawing circuit units 21 and 22 intersect each other. Therefore, the equipment configuration of the intersecting portions of the connection buses 45 and 46 is likely to be complicated, which increases the manufacturing cost of the apparatus. For this reason, it has been desired to draw a line with a simple configuration.

  By the way, in the gas insulated switchgear, the operation box for operating each device is, for example, the disconnectors 30 and 31 with the main bus grounding switch of the circuit breaker unit or the disconnector with the grounding switch of the drawer circuit unit. 32. Generally, it is arranged in the vicinity of the ground switch 33 for the lead-out circuit. Of course, the gas-insulated switchgear in FIG. 11 is also provided with an operation box for operating the equipment. However, since the upper units 1 to 4 are surrounded by the two main buses 25 and 26, the following problems occur. there were. That is, depending on the installation location of the operation box, the worker has to go around the main buses 25 and 26 and approach the operation box. As a result, the route when the worker approaches the operation box becomes long, and the operation, maintenance, and inspection of each device may not be performed efficiently.

  The gas insulated switchgear according to the present embodiment has been proposed in order to solve the above problems. The purpose of this embodiment is to reduce the building area by downsizing, thereby contributing to the reduction of the construction area of the substation. An object of the present invention is to provide a gas-insulated switchgear with improved performance.

In order to achieve the above object, the gas insulated switchgear according to the present embodiment includes the following (a) to ( h ).
(A) A plurality of vertical circuit breakers in which two upper and lower outlets are formed in substantially the same direction and two upper and lower disconnectors having connection axes connected to the respective outlets and extending in the horizontal direction. Breaker unit.
(B) A drawer circuit unit having an external power receiving terminal and arranged so as to be sandwiched by the circuit breaker unit from both sides.
(C) A first connection bus provided in the lead-out circuit unit and connecting upper disconnectors or lower disconnectors of the circuit breaker units located on both sides of the lead-out circuit unit.
(D) The circuit breaker units and the lead-out circuit units are alternately connected in series, and the circuit breaker units are arranged at both ends, and one of the two disconnectors in the circuit breaker units at both ends. Only, the upper unit formed by connecting the first connection buses of the adjacent drawing circuit units.
(E) The breaker unit disposed at both ends of the upper unit is connected to the disconnector on the side not connected to the first connection bus and is positioned above or below the first connection bus. Second connecting bus.
(F) A main bus bar that is connected to the second connection bus bar and has the bus bar axis arranged on a plane including the connection axis lines of the upper and lower two disconnectors.
(G) Of the two upper and lower disconnectors of the breaker unit, the disconnector on the side to which the main bus is connected via the first connection bus is grounded on the main bus on the opposite side to the main bus Connect the earthing switch and instrument transformer.
(H) The connection axes of the earthing switch and the instrument transformer are arranged substantially parallel to the unit axis of the circuit breaker unit and set shorter than the unit axis.

Plan view of the first embodiment Front view of the first embodiment Front view of the host unit in the first embodiment XX arrow view of FIG. Side view of the circuit breaker unit in the first embodiment Side view of the drawer circuit unit in the first embodiment Front view of the host unit in the second embodiment YY arrow view of FIG. The top view of the high-order unit in 3rd Embodiment Typical single-line diagram of conventional gas insulated switchgear Plan view of conventional gas insulated switchgear

(1) First Embodiment [Configuration]
With reference to FIGS. 1-6, arrangement | positioning of the apparatus which comprises 1st Embodiment is demonstrated. In the first embodiment, the arrangement of component devices is improved. The component devices themselves are the same as the component devices of the conventional example shown in FIGS. Therefore, the same members as those of the conventional example are denoted by the same reference numerals.

  As shown in FIG. 1, the upper units 1 to 4 are arranged in the left-right direction in FIG. 1, and are arranged apart from each other by a certain distance. The unit axis of each unit, which is a component of the upper units 1 to 4 (the connection axis of the devices constituting the unit), extends in the vertical direction in FIG. All unit axes are arranged parallel to each other.

  Further, as shown in FIG. 1, bushings 39 and 40 are connected to the drawing circuit units 21 and 22 of the upper unit 3. The bushing 40 is disposed on the lower side of FIG. 1, and the bushing 39 is disposed on the upper side of FIG. The drawing axis of the bushing 39 is on the same straight line as the unit axis of the drawing circuit unit 21, and the drawing axis of the bushing 40 is on the same straight line as the unit axis of the drawing circuit unit 22. The drawing axes of the bushings 39 and 40 are arranged substantially parallel to each other and facing in the opposite direction by 180 degrees. For this reason, the connection buses 47 and 48 that connect the units 21 and 22 and the bushings 39 and 40 are straight lines extending in the vertical direction in FIG. 1 and are arranged in parallel to each other.

  As shown in FIG. 2, the first main bus 25 is disposed above the upper units 1 to 4, and the second main bus 26 is disposed below the upper units 1 to 4. That is, the main buses 25 and 26 are arranged in parallel so as to sandwich the upper units 1 to 4 from above and below. Furthermore, the main busbars 25 and 26 have their busbar axes arranged on a plane including the connection axes of the disconnectors 30 and 31 of the circuit breaker units 5 to 16.

  As shown in FIGS. 2 to 4, in the upper unit 1, the disconnectors 31 on the lower side of the circuit breaker unit 5 and the circuit breaker unit 6 are connected in a straight line by the connection bus 36 of the drawing circuit unit 17. ing. In the upper unit 1, the breakers 30 on the upper side of the breaker unit 6 and the breaker unit 7 are connected in a straight line by the connection bus 36 of the lead-out circuit unit 18.

  Furthermore, in the circuit breaker unit 5 located at one end of the upper unit 1 (left end in FIGS. 2 to 4), the upper disconnector 30 on the side not connected to the connection bus 36 of the lead-out circuit unit 17 is A connection bus 37 (shown in FIGS. 2 and 3) is connected. The first main bus 25 is connected to the upper portion of the connection bus 37.

  Further, in the circuit breaker unit 7 located at the other end of the upper unit 1 (the right end in FIGS. 2 to 4), the disconnector 31 on the lower side that is not connected to the connection bus 36 of the lead-out circuit unit 18 is connected. Is connected to a connection bus 38 (shown in FIGS. 2 and 3). The second main bus 26 is connected to the lower portion of the connection bus 38.

  The upper units 2 to 4 have the same device arrangement. That is, as for the relationship between the upper units 1 to 4 and the main buses 25 and 26, as shown in FIG. 2, the circuit breaker units 5 and 7 (8 and 10, 11 and 13, 14 and 16) and the main buses 25 and 26 are connected by connecting buses 37 and 38. The connection axes of the connection buses 37 and 38 are arranged on a plane including the connection axis lines of the disconnectors 30 and 31 in the same manner as the main buses 25 and 26.

  Next, arrangement | positioning of the apparatus which comprises the circuit breaker units 5-16 is demonstrated using FIG. As shown in FIG. 5, the gas circuit breaker 27 in each circuit breaker unit 5-16 is arrange | positioned at the vertical type. The gas circuit breaker 27 is provided with two upper and lower outlet portions 27a and 27b which are substantially parallel and face in the same direction (right direction in FIG. 4).

  An instrument current transformer 28 is connected to the upper outlet part 27a, and an instrument current transformer 29 is connected to the lower outlet part 27b. Disconnectors 30 and 31 are connected to the current transformers 28 and 29 for the instruments. The disconnectors 30 and 31 have a connecting axis extending in the horizontal direction. In the circuit breaker units 5 to 16, these disconnectors 30 and 31 are located at the end of the unit.

  Furthermore, the arrangement of the devices constituting the drawer circuit units 17 to 24 will be described with reference to FIG. As shown in FIG. 6, the disconnect switch 32 and the ground switch 33 in each drawer circuit unit 17-24 are accommodated in the same vertical container. A lead-out portion 33a facing upward is formed at the upper portion of the ground switch 33, and an instrument transformer 34 is connected to the lead-out portion 33a.

  An external power receiving terminal 35 is installed near the lower end of the disconnector 32. Further, the disconnector 32 is formed with a lead portion 32a facing rightward in FIG. 6, and a connection bus 36 is connected to the lead portion 32a. In the drawing circuit units 17 to 24, the connection bus 36 is located at the end of the unit. The connection axis of the connection bus 36 is arranged on a plane including the connection axes of the disconnectors 30 and 31 of the circuit breaker units 5 to 16 in the same manner as the bus axes of the main buses 25 and 26.

[Function and effect]
In the first embodiment as described above, as shown in FIG. 1 and FIG. 2, 20 units 5 to 24 are arranged side by side so as to be parallel to each other, and the bus axis of the main buses 25 and 26 is cut off. It arrange | positions on the plane containing each connection axis line of the disconnectors 30 and 31 of the container units 5-16. At this time, the plane including each connection axis of the disconnectors 30 and 31 coincides with the plane including one edge of the upper units 1 to 4.

  Therefore, when the first embodiment is viewed from above, the main buses 25 and 26 do not jump out from one edge of the upper units 1 to 4 in the width direction, and the inside of the occupied area of the upper units 1 to 4 Fits in. Therefore, as shown in FIG. 1, the width dimension W <b> 2 of the gas insulated switchgear coincides with the width dimension of the upper units 1 to 4. According to such a 1st embodiment, compared with the conventional gas insulation switchgear shown in Drawing 11, width dimension W2 of a device can be made small, a building area becomes small, and a construction area of a substation Can be reduced.

  In the first embodiment, the main buses 25 and 26 are arranged above and below the upper units 1 to 4, so that the main buses 25 and 26 do not surround the upper units 1 to 4. Therefore, even if the operation boxes of the devices are scattered, the operation boxes can be easily approached, and the route to the operation boxes can be shortened. Therefore, access to the operation box becomes easy, and the operation efficiency of the equipment and the work efficiency of maintenance / inspection are improved.

  Furthermore, in the first embodiment, the bushing 39 and the drawer circuit unit 21 and the bushing 40 and the drawer circuit unit 22 can be placed on the same straight line. Therefore, the connection buses 47 and 48 that connect the two have a linear configuration and do not cross each other. Therefore, the device configuration can be simplified in the first embodiment. As a result, the line can be drawn smoothly, and the cost can be reduced.

(2) Second Embodiment A second embodiment will be described with reference to FIGS. 2nd Embodiment is the same as that of the said 1st Embodiment regarding the basic composition of the high-order units 1-4.

[Constitution]
As shown in FIGS. 7 and 8, in the upper unit 4, the breaker units 14 and the lower disconnectors 31 on the lower side of the breaker unit 15 are connected in a straight line by the connection bus 36 of the drawer circuit unit 23. In the upper unit 4, the circuit breaker unit 15 and the upper disconnector 30 of the circuit breaker unit 16 are connected in a straight line by the connection bus 36 of the lead-out circuit unit 24.

  Further, in the circuit breaker unit 14 located at one end portion (left end portion in FIG. 7) of the upper unit 4, the connection bus bar 37 (the connection bus bar 37) is connected to the upper disconnector 30 on the side not connected to the connection bus bar 36 of the lead-out circuit unit 23. (Shown in FIG. 7) is connected. The first main bus 25 is connected to the upper portion of the connection bus 37.

  In the disconnector 30 to which the connection bus 37 is connected, the main bus grounding switch 41 is horizontally connected to the surface opposite to the surface to which the connection bus 37 is connected. The earthing switch 41 is connected to an instrument transformer 42 (shown in FIG. 8) for the main bus. The instrument transformer 42 is arranged so as to be orthogonal to the connection direction of the ground switch 41 to the disconnect switch 30.

  Further, in the circuit breaker unit 16 located at the other end of the upper unit 4 (the right end in FIG. 7), it is connected to the lower disconnector 31 on the side not connected to the connection bus 36 of the lead-out circuit unit 24. A bus 38 (shown in FIG. 7) is connected. The second main bus 26 is connected to the lower portion of the connection bus 38.

  In the disconnector 31 to which the connection bus 38 is connected, a ground switch 43 for the main bus is horizontally connected to the surface opposite to the surface to which the connection bus 38 is connected. The earthing switch 43 is connected to an instrument transformer 44 (shown in FIG. 8) for the main bus. The instrument transformer 44 is disposed so as to be orthogonal to the connection direction of the ground switch 43 to the disconnector 31.

  The earthing switches 41 and 43 and the instrument transformers 42 and 44 are arranged so that their connection axes are substantially parallel to the unit axes of the circuit breaker units 14 to 16. At this time, the width dimension W3 of the connection axis of the ground switches 41 and 43 and the instrument transformers 42 and 44 is set to be shorter than the width dimension W2 of the gas insulated switchgear (both shown in FIG. 8).

[Function and effect]
According to the second embodiment as described above, the main line grounding switches 41 and 43 are connected to the disconnecting switches 30 and 31 of the breaker units 14 and 16 without changing the configuration of the upper unit 4. Can be placed on the line. In addition, since the instrument transformers 42 and 44 are connected to the ground switches 41 and 43, it is not necessary to install these devices 41 to 44 on the main buses 25 and 26.

  Therefore, in the second embodiment, unlike the conventional example shown in FIG. 11, the width of the main buses 25 and 26 does not bulge outward. As a result, even when the earthing switches 41 and 43 and the instrument transformers 42 and 44 are installed, the width dimension W2 of the gas insulated switchgear similar to that of the first embodiment can be set. . As a result, the building area of the gas insulated switchgear can be reduced, and the construction area of the substation can be reduced.

(3) Third Embodiment A third embodiment will be described with reference to FIG.
[Constitution]
In the third embodiment, in the upper unit 1A, the breaker units 5 to 7 and the drawer circuit units 17 and 18 are configured so that the lengths of the unit axes are set substantially the same. Similarly, in the other three upper units, the length dimensions of the unit axis lines of the three circuit breaker units and the two drawer circuit units are set to be substantially the same.

[Function and effect]
According to the third embodiment, the outer shapes of the upper units 1 to 4 are rectangular when viewed from the plane. Therefore, the structure of the transportation platform can be simplified. As a result, it becomes easy to transport a plurality of upper units 1 to 4 including the main bus in a lump, and it is possible to reduce the number of packings and reduce the number of construction sites. Thereby, transportation cost and construction cost are reduced, which is economically advantageous. In addition, since the upper units 1 to 4 have a rectangular structure that is strong in terms of strength, there are advantages in that the safety during transportation is high and the quality of the apparatus is improved.

(4) Other Embodiments The above-described embodiment is presented as an example in the present specification, and is not intended to limit the scope of the invention. In other words, the present invention can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof in the same manner as included in the scope and gist of the invention.

1 to 4 ... upper units 5 to 16 ... circuit breaker units 17 to 24 ... drawer circuit unit 25 ... first main bus line 26 ... second main bus line 27 ... gas circuit breakers 28 and 29 ... current transformer 30 for instrument, 31, 32 ... Disconnectors 33, 41, 43 ... Grounding switches 34, 42, 44 ... Instrument transformer 35 ... External power receiving terminals 36, 37, 38 ... Connection buses 39, 40 ... Bushing

Claims (3)

A plurality of circuit breaker units comprising a vertical circuit breaker in which two upper and lower outlets are formed in substantially the same direction and two upper and lower disconnectors connected to each outlet and extending in the horizontal direction. When,
A drawer circuit unit that includes an external power receiving terminal and is arranged so as to be sandwiched by the circuit breaker unit from both sides;
A first connecting bus that is provided in the drawer circuit unit and connects between the upper disconnectors or the lower disconnectors of the circuit breaker unit located on both sides of the drawer circuit unit;
The circuit breaker unit and the drawing circuit unit are alternately connected in series, and the circuit breaker unit is disposed at both ends, and is adjacent to only one of the two disconnectors in the circuit breaker unit at both ends. An upper unit formed by connecting the first connection bus of the drawer circuit unit;
The breaker unit disposed at both ends of the upper unit is connected to the disconnector on the side not connected to the first connection bus and is located above or below the first connection bus. Connection bus of
A main bus that is connected to the second connection bus and has its bus axis arranged on a plane that includes the connection axes of the upper and lower two disconnectors;
I have a,
Of the two upper and lower disconnectors of the circuit breaker unit, the disconnector on the side to which the main bus is connected via the first connection bus is connected to the ground for grounding the main bus on the opposite side to the main bus Connect the switch and instrument transformer,
The gas insulated switchgear characterized in that the connection axis of the earthing switch and the instrument transformer is arranged substantially parallel to the unit axis of the circuit breaker unit and is set shorter than the unit axis . An external power receiving bushing is connected to the ends of the two drawer circuit units;
The two bushings are arranged such that a drawer axis direction is substantially parallel to a unit axis direction of the drawer circuit unit, and the bushing drawer axis directions are opposite to each other by 180 degrees. The gas insulated switchgear according to 1 . The gas insulated switchgear according to claim 1 or 2 , wherein the length of the unit axis of the circuit breaker unit and the drawer circuit unit is set to be the same.

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