Gas-insulated switchgear and power distribution equipment

Abstract

To simplify the configuration by reducing the number of surfaces when configuring power receiving and distribution equipment. [Solution] The gas-insulated switchgear (100) includes a main unit (101) and a connection unit (102) that are vertically aligned and integrated. The main unit includes a lower tank (105) filled with insulating gas and a vacuum circuit breaker (111) and other components disposed inside the lower tank for switching the power distribution circuit. The connection unit includes an upper tank (106) filled with insulating gas and a grounding switch-equipped disconnector (136) disposed inside the upper tank for switching the power distribution circuit between a disconnected state and a connected state of each busbar (143A, 144A). The grounding switch-equipped disconnector includes a rotatable movable terminal (137) and a fixed connection terminal (138) that connects and disconnects with the movable terminal as the movable terminal rotates. The connection unit includes connection areas (C1 to C3) for three busbar circuits outside the upper tank.

Description

[Technical Field]

[0001] The present invention relates to a gas-insulated switchgear and a power receiving / distribution facility used for transmitting, distributing, and receiving electric power. [Background technology]

[0002] Patent Document 1 discloses a gas-insulated switchgear that houses a vacuum circuit breaker and multiple disconnecting / earthing switches in a tank. When a power receiving facility is configured using multiple such gas-insulated switchgears, for example, a voltage meter transformer (hereinafter referred to as "VCT") that measures the amount of power traded is bypassed between a power receiving unit that receives power through two regular and spare circuits and two load units. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2024-158591 Summary of the Invention [Problem to be solved by the invention]

[0004] In power receiving equipment with the above-mentioned configuration, there is a problem that the installation area of ​​gas insulated switchgear arranged in a row becomes large due to the increase in the number of surfaces (panels) caused by the provision of a disconnector unit to bypass the VCT unit, etc. Furthermore, in power receiving equipment using multiple gas insulated switchgears, it is required to reduce the number of surfaces and assembly man-hours by standardizing the configuration of each gas insulated switchgear while arranging multiple types of row numbers and reducing the number of surfaces.

[0005] The present invention has been made in consideration of the above-described circumstances, and aims to provide a gas-insulated switchgear and a power distribution facility that can reduce the number of surfaces when configuring the power distribution facility and simplify the configuration. [Means for solving the problem]

[0006] A gas-insulated switchgear according to one aspect of the present invention is a gas-insulated switchgear comprising: a first tank filled with insulating gas; a main unit having devices disposed inside the first tank for opening and closing a distribution circuit; a second tank filled with insulating gas; and a connection unit having a disconnector disposed inside the second tank for switching between a disconnected state and a connected state between the distribution circuit and a bus bar; wherein the main unit and the connection unit are vertically aligned and integrated; the disconnector has a movable terminal provided to be rotatable and a fixed terminal which is brought into contact with and separated from the movable terminal by the rotation of the movable terminal, and switches between the disconnected state and the connected state by the contact and separation; and the connection unit has a connection region for at least three bus bars outside the second tank. The connection area is formed in two lines behind the second tank and one line above the second tank. It is characterized by the fact that [Effects of the Invention]

[0007] According to the present invention, the connection unit has busbar connection areas for at least three circuits, which increases the flexibility of busbar layout when configuring a power distribution facility using multiple gas-insulated switchgears. This allows the main unit and connection unit to be arranged vertically, reducing the number of surfaces in the power distribution facility. Furthermore, by selecting and using busbar connection areas for at least three circuits, it is possible to standardize parts for multiple gas-insulated switchgears that configure the power distribution facility, reducing the number of parts and assembly man-hours and simplifying the configuration. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a circuit diagram of a power receiving and distribution facility of a first configuration according to an embodiment. [Figure 2] FIG. 10 is a circuit diagram of a power receiving and distribution facility of a second configuration according to an embodiment. [Figure 3] FIG. 10 is a circuit diagram of a power receiving and distribution facility of a third configuration according to an embodiment. [Figure 4] 1 is a partial schematic cross-sectional view showing the internal configuration of a gas-insulated switchgear according to an embodiment. [Figure 5]FIG. 10 is a partial schematic cross-sectional view of an A-type connection unit. [Figure 6] This is a top view of the A-type connection unit. [Figure 7] This is a rear view of the A-type connection unit. [Figure 8] FIG. 2 is a schematic perspective view of a link mechanism. [Figure 9] FIG. 10 is a partial schematic cross-sectional view of a B-type connection unit. [Figure 10] FIG. 10 is a partial schematic cross-sectional view of a C-type connection unit. [Figure 11] FIG. 2 is a unit configuration diagram showing the power receiving and distribution facility of the first configuration in three dimensions. [Figure 12] FIG. 3 is a unit configuration diagram showing the power receiving and distribution facility of the second configuration in a three-dimensional manner. [Figure 13] FIG. 10 is a unit configuration diagram showing the power receiving and distribution facility of the third configuration in a three-dimensional manner. [Figure 14] FIG. 10 is a unit configuration diagram showing the power receiving and distribution facility of the third configuration in a three-dimensional manner. [Figure 15] FIG. 1 is a diagram illustrating a conventional unit configuration in a power receiving and distribution facility of a first configuration. [Figure 16] FIG. 10 is a diagram illustrating a conventional unit configuration in a power receiving and distribution facility having a second configuration. [Figure 17] FIG. 10 is a diagram illustrating a conventional unit configuration in a power receiving and distribution facility of a third configuration. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a power receiving and distribution facility using a gas-insulated switchgear according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. Note that the present invention is not limited to the following embodiment, and can be implemented by appropriate modifications within the scope of the present invention. For the sake of convenience, some components may be omitted in the following drawings.

[0010] First, the power receiving and distribution equipment of the embodiment will be described using a circuit diagram and a unit configuration diagram. In this embodiment, three types of power receiving and distribution equipment can be configured as shown in Figures 1 to 3. Hereinafter, the configuration shown in the circuit diagram of Figure 1 will be referred to as the first configuration, the configuration shown in the circuit diagram of Figure 2 will be referred to as the second configuration, and the configuration shown in the circuit diagram of Figure 3 will be referred to as the third configuration.

[0011] The power receiving and distribution equipment of the first configuration in Fig. 1 is a normal / standby power receiving (with 1 VCT and bypass DS), the power receiving and distribution equipment of the second configuration in Fig. 2 is a normal / standby power receiving (with 2CB, 2 VCT and busbar connecting DS), and the power receiving and distribution equipment of the third configuration in Fig. 3 is a normal / standby power receiving (with 1 VCT, bypass DS and busbar connecting DS). The power receiving and distribution equipment using the gas insulated switchgear of this embodiment can adopt various configurations other than the first to third configurations, but this embodiment will be described taking the first to third configurations as examples.

[0012] As shown in Figure 1, the power receiving and distribution equipment of the first configuration is connected in both the normal power receiving and standby power receiving circuits from the entrance of the power system on the power receiving side via a three-phase current transformer 11, a voltage detector 12, a grounding switch 13, and a vacuum circuit breaker 14. Grounding switch-equipped disconnecting switches 17 and 18 are provided on both sides of the vacuum circuit breaker 14.

[0013] The normal power receiving and standby power receiving are connected from the power receiving side to the load side by a first bypass circuit 20 and a second bypass circuit 21. A VCT 23 and a bypass disconnector 24 are connected between the first bypass circuit 20 and the second bypass circuit 21. Disconnectors with earthing switches 25 and 26 are provided on both sides of the VCT 23.

[0014] On the load side of the second bypass circuit 21, two circuits are provided, each connected to the load via a disconnecting switch with earthing switch 28, a vacuum circuit breaker 29, an earthing switch 30, and a three-phase or two-phase current transformer 31. A grounded potential transformer 33 and a lightning arrester 34 are also connected to these two circuits.

[0015] The power receiving and distribution equipment of the first configuration shown in the circuit diagram of FIG. 1 has conventionally adopted the configuration shown in FIG. 15. FIG. 15 is a diagram of a conventional unit configuration in the first configuration. As shown in FIG. 15, the conventional power receiving and distribution equipment of the first configuration has seven units, each of which constitutes a panel, arranged in a row on a panel, with seven surfaces. More specifically, from left to right in FIG. 15, the following units are arranged: feeder unit U011, feeder unit U012, bypass unit U013, VCT unit U014, bypass unit U015, regular power receiving unit U016, and standby power receiving unit U017.

[0016] Next, a power receiving and distribution facility of a second configuration will be described with reference to Fig. 2. In the second configuration and a third configuration described later, devices common to the first configuration will be denoted by common reference numerals.

[0017] As shown in Figure 2, the power receiving and distribution equipment of the second configuration is connected in both the normal power receiving and standby power receiving circuits from the entrance of the power system on the power receiving side via a three-phase current transformer 11, a voltage detector 12, a grounding switch 13, a disconnecting switch with grounding switch 17, a vacuum circuit breaker 14, and a VCT 23. Furthermore, on the load side of the VCT 23, the normal power receiving and standby power receiving are connected by a busbar connecting circuit 22, and a disconnecting switch with grounding switch 18 is provided between the VCT 23 and the busbar connecting circuit 22.

[0018] Two busbar connection disconnectors 27a and 27b, each consisting of a disconnector with a grounding switch, are provided in the busbar connection circuit 22. On the load side of the busbar connection circuit 22, two circuits are provided, each connected to the load via a disconnector with a grounding switch 28, a vacuum circuit breaker 29, a grounding switch 30, and a three-phase current transformer 31. A grounded voltage transformer 33 and a lightning arrester 34 are connected to each of these two circuits.

[0019] The power receiving and distribution equipment of the second configuration shown in the circuit diagram of FIG. 2 has conventionally adopted the configuration shown in FIG. 16. FIG. 16 is a diagram of the conventional unit configuration in the second configuration. As shown in FIG. 16, the conventional power receiving and distribution equipment of the second configuration has 10 units, each of which constitutes a panel, arranged in a row on the panel, with a total of 10 surfaces. More specifically, from left to right in FIG. 16, the following units are arranged: a regular power receiving unit U021, a VCT unit U022, an EVT / LA unit U023, a feeder unit U024, a busbar connecting unit U025, a busbar connecting unit U026, a feeder unit U027, an EVT / LA unit U028, a VCT unit U029, and a standby power receiving unit U02A.

[0020] Next, a third configuration of power receiving and distribution equipment will be described with reference to Fig. 3. As shown in Fig. 3, the third configuration of power receiving and distribution equipment uses first and second busbar connecting circuits 45, 46, and two busbar connecting disconnectors 40, 41, each consisting of a disconnector with a grounding switch, are provided in the first and second busbar connecting circuits 45, 46. In addition, a grounded potential transformer 43 and a lightning arrester 44 are connected to each of the two circuits on the load side of the second busbar connecting circuit 46.

[0021] The power receiving and distribution equipment of the third configuration shown in the circuit diagram of Figure 3 has traditionally adopted the configuration shown in Figure 17. Figure 17 is a diagram of the conventional unit configuration in the third configuration. As shown in Figure 17, the conventional power receiving and distribution equipment of the third configuration has 12 units, each of which constitutes a panel, arranged in a row on the panel, resulting in 12 panels. More specifically, from left to right in Figure 17, the bypass DS unit U031, standby power receiving unit U032, busbar tie unit U033, busbar tie unit U034, regular power receiving unit U035, VCT unit U036, EVT / LA unit U037, feeder unit U038, busbar tie unit U039, busbar tie unit U03A, feeder unit U03B, and EVT / LA unit U03C are arranged.

[0022] In this embodiment, in order to reduce the number of surfaces in the first to third configurations, a unit equipped with devices for switching distribution circuits is configured using a gas-insulated switchgear as shown in Fig. 4 to Fig. 10. Hereinafter, a gas-insulated switchgear 100 according to an embodiment of the present invention will be described with reference to Fig. 4 to Fig. 10. In this specification and claims, "front," "rear," "up," "down," "left," and "right" are used based on the directions shown by arrows in the drawings.

[0023] The present invention is applicable to, for example, a three-phase cubicle-type gas-insulated switchgear. However, the gas-insulated switchgear to which the present invention is applicable is not limited to this and can be modified as appropriate. For example, the present invention can also be applied to a single-phase gas-insulated switchgear.

[0024] FIG. 4 is a partial schematic cross-sectional view showing the internal configuration of a gas-insulated switchgear according to an embodiment. As shown in FIG. 4, the gas-insulated switchgear 100 of this embodiment includes a main unit 101 and a connection unit 102 arranged side by side. In the gas-insulated switchgear 100, the connection unit 102 is connected to the top of the main unit 101, and the main unit 101 and the connection unit 102 are vertically aligned and integrated. The main unit 101 and the connection unit 102 are housed in an external housing (not shown) with doors at the front and rear. Note that, in each of the following configurations of the main unit 101 and the connection unit 102, three units are provided for each of the three phases, excluding an insulating board 104 and tanks 105 and 106 (described later). However, depending on the drawing, the units may be stacked and only one unit may be shown, and each configuration in the drawing may be denoted by a reference numeral for only one of the three units.

[0025] The main unit 101 is provided with an insulating board 104 in the shape of a bottomed container that functions as a partition at the boundary between the main unit 101 and the connection unit 102. The main unit 101 is provided with a lower tank 105 (first tank) that forms an airtight space below the insulating board 104. The connection unit 102 is provided with an upper tank 106 (second tank) that forms an airtight space above the insulating board 104. Each of the tanks 105, 106 is filled with an insulating gas such as sulfur hexafluoride (SF6) or dry air.

[0026] The main unit 101 includes a disconnecting switch with earthing switch 108 disposed inside an insulating board 104. The main unit 101 also includes a vacuum circuit breaker 111, a disconnecting switch with earthing switch 112, and a grounding switch 113 as devices disposed inside a lower tank 105 for opening and closing the power distribution circuit, and further includes a lightning arrester 114. The disconnecting switches with earthing switch 108, 112 and the vacuum circuit breaker 111 are configured to open and close the power distribution circuit (current path). The grounding switch 113 is configured to ground the power distribution circuit.

[0027] The earthing switch-equipped disconnector 108 is connected to a conductor 116 that passes through the insulating board 104 and supplies current to the vacuum circuit breaker 111. In other words, the earthing switch-equipped disconnector 108 and the vacuum circuit breaker 111 are connected via the conductor 116. The earthing switch-equipped disconnector 108 is provided so that an operating mechanism 117 provided on the outside (front side) of the front wall 105a of the lower tank 105 can switch between disconnection, connection, and grounding of the circuit.

[0028] The vacuum circuit breaker 111 includes a container 111a, a movable contact and a fixed contact (not shown) disposed within the container 111a, a first connection terminal 111b, and a second connection terminal 111c. The vacuum circuit breaker 111 has the function of breaking the current path between the first connection terminal 111b and the second connection terminal 111c, and the function of connecting and closing the current path. The movable contact of the vacuum circuit breaker 111 is driven and operated by an operating mechanism 118 to switch between breaking and closing by contacting and separating with the fixed contact. The operating mechanism 118 is provided on the outside of the front wall 105a of the lower tank 105.

[0029] The second connection terminal 111c of the vacuum circuit breaker 111 is connected to the movable element 112a of the earthing switch-equipped disconnector 112. The movable element 112a of the earthing switch-equipped disconnector 112 is operated to rotate by an operating mechanism 119 provided on the outside of the front wall 105a of the lower tank 105.

[0030] The movable element 112a of the earthing switch-equipped disconnector 112 is in a position shown by a solid line in Fig. 4, separated from the earthing stator 112b and the connecting stator 112c, and in this state disconnects the circuit. The earthing switch-equipped disconnector 112 grounds the circuit when the tip of the movable element 112a comes into contact with the earthing stator 112b located above. The connecting stator 112c located below the movable element 112a is connected to the conductor 121 that carries electricity to the main circuit cable 120. Therefore, the earthing switch-equipped disconnector 112 establishes a connected state when the tip of the movable element 112a comes into contact with the connecting stator 112c.

[0031] The main circuit cable 120 is connected to the conductor 121 via a cable connection bushing 124 and a cable head 125 that pass through the rear wall 105b of the lower tank 105. Outside the lower tank 105, a current transformer 122 is provided on the main circuit cable 120.

[0032] The earthing switch 113 and the lightning arrester 114 are provided so as to be connectable to the conductor 121. The earthing switch 113 is driven and operated by an operating mechanism 127 provided on the outside of the front wall 105a of the lower tank 105.

[0033] The above-described main unit 101 is an example, and depending on the function of the gas-insulated switchgear 100 in the power receiving and distribution facility, at least one of the vacuum circuit breaker 111, the disconnecting switch with earthing switch 112, and the earthing switch 113, which are devices that open and close the power distribution circuit, may be omitted. Also, depending on the function of the gas-insulated switchgear 100 in the power receiving and distribution facility, the disconnecting switch with earthing switch 108 and the lightning arrester 114 may be omitted.

[0034] Next, the connection unit 102 will be described. In this embodiment, there are three types of connection unit 102, and the three types have partially common configurations but different configurations overall. Furthermore, any one of the three types is selected and adopted as the connection unit 102. Hereinafter, the three types of connection unit 102 will be referred to as Type A, Type B, and Type C, and the configuration shown in FIGS. 4 and 5 will be referred to as Type A. Furthermore, the configuration shown in FIG. 9 will be referred to as Type B, and the configuration shown in FIG. 10 will be referred to as Type C. Configurations that differ among the three types of connection unit 102 will be suffixed with "A," "B," or "C" depending on the type, and configurations common to the three types will not be suffixed with "A," "B," or "C." Below, the connection unit 102 of this embodiment will be described in the order of Type A, Type B, and Type C.

[0035] The gas-insulated switchgear 100 equipped with the A-type connection unit 102 is configured as a first gas-insulated switchgear. The upper tank 106A (second tank) of the A-type connection unit 102 includes a front wall 131, a rear wall 132A, a top wall 133A, and a pair of side walls 134A (one of which is not shown) that close the left and right sides of the front wall 131, the rear wall 132A, and the top wall 133A. The lower part of the upper tank 106A is separated from the lower tank 105 by the insulating board 104 described above, forming a sealed space.

[0036] The front wall 131 of the upper tank 106A is aligned with the front wall 105a of the lower tank 105 and is disposed on the same plane. The rear wall 132A of the upper tank 106A is aligned with the rear wall 105b of the lower tank 105 and is disposed on the same plane. The top wall 133A of the upper tank 106A is formed in a flat shape that is parallel to the horizontal direction.

[0037] Fig. 5 is a partial schematic cross-sectional view of a type A connection unit. As also shown in Fig. 5, the connection unit 102 further includes a grounding switch-equipped disconnector 136 (disconnector) disposed inside the upper tank 106A. The grounding switch-equipped disconnector 136 includes a rotatably provided movable terminal 137, a connection fixed terminal 138 (fixed terminal) that comes into contact with and separates from the rotating movable terminal 137, and a grounding fixed terminal 139. In the grounding switch-equipped disconnector 136, the movable terminal 137 is operated to rotate via an operating mechanism 141 provided on the outside of the front wall 131.

[0038] The movable terminal 137 is supported at its base end via a rotation support portion 142 so as to be rotatable within a predetermined angular range. In this embodiment, when viewed from the left and right as shown in Fig. 5, the movable terminal 137 is disposed in the central region of the upper tank 106A in both the up-down and down-directions and the front-to-rear directions, and is provided so as to be rotatable between approximately the 2 o'clock and 6 o'clock directions. Furthermore, when the movable terminal 137 is rotated approximately in the 4 o'clock direction, as shown by the solid line in Fig. 5, the earthing switch-equipped disconnector switch 136 is in a disconnected state where the movable terminal 137 is separated from the connection fixed terminal 138 and the grounding fixed terminal 139; this disconnected state will be described later.

[0039] When movable terminal 137 is rotated in the 2 o'clock direction, its tip comes into contact with fixed connection terminal 138. In other words, fixed connection terminal 138 is disposed diagonally forward and upward in the 2 o'clock direction relative to rotation support part 142, which is the rotation center of movable terminal 137. Earthing switch-equipped disconnector switch 136 is brought into a connected state by contact between movable terminal 137 and fixed connection terminal 138, and this connected state will be described later.

[0040] When movable terminal 137 is rotated in the 6 o'clock direction, its tip comes into contact with grounding fixed terminal 139. In other words, grounding fixed terminal 139 is disposed downward, in the 6 o'clock direction, relative to rotation support part 142, which is the rotation center of movable terminal 137. Grounding switch-equipped disconnector switch 136 is brought into a grounded state by contact between movable terminal 137 and grounding fixed terminal 139, and this grounding state will be described later.

[0041] The connection unit 102 is connected to a first busbar 143A (busbar) and a second busbar 144A (busbar). The first busbar 143A is connected to a first busbar connector 145A above the top wall 133A. A first busbar connection bushing 146A is provided penetrating the top wall 133A, and the first busbar 143A is connected to the first busbar connection bushing 146A via the first busbar connector 145A. The first busbar connection bushing 146A is connected to a fixed terminal connecting conductor 148A inside the upper tank 106A. This brings the first busbar 143A and the fixed terminal connecting conductor 148A into an electrically conductive state.

[0042] When viewed from the left and right as in Fig. 5, the first busbar connectors 145A corresponding to three phases and the first busbar connecting bushings 146A are arranged side by side in the front-rear direction. Note that the first busbar connectors 145A corresponding to three phases are arranged so as not to overlap each other in the left-right direction (see Fig. 6).

[0043] The second busbar 144A is connected to a second busbar connector 149A in the lower half region of the rear wall 132A of the upper tank 106A. A second busbar connection bushing 150A is provided penetrating the rear wall 132A, and the second busbar 144A is connected to the second busbar connection bushing 150A via the second busbar connector 149A. The second busbar connection bushing 150A is connected to a movable terminal connecting conductor 151A inside the upper tank 106A. This brings the second busbar 144A and the movable terminal connecting conductor 151A into an electrically conductive state.

[0044] When viewed from the left and right as in Fig. 5, the second busbar connectors 149A corresponding to three phases and the second busbar connecting bushings 150A are arranged side by side in the vertical direction and are disposed in approximately the lower half of the upper tank 106A. Note that the second busbar connectors 149A corresponding to three phases are disposed so as not to overlap each other in the horizontal direction (see Figs. 6 and 7).

[0045] In this way, the connection unit 102 is capable of connecting the first busbar 143A and the second busbar 144A outside the upper tank 106A, in other words, it has connection areas for two lines, the first busbar 143A and the second busbar 144A. More specifically, the connection unit 102 forms a first connection area C1, to which one line of the first busbar 143A is connected, outside the upper part of the upper tank 106A. In addition, the connection unit 102 forms a second connection area C2 (lower connection area), to which one line of the second busbar 144A is connected, outside the rear lower half of the upper tank 106A.

[0046] Furthermore, the connection unit 102 forms a third connection area C3 (upper connection area) outside the upper rear half of the upper tank 106A, to which busbars 144B and 144C, which constitute one circuit indicated by the dashed lines in Fig. 5, can be connected. The third connection area C3 is an empty area where no busbars are connected. A second busbar 144B is connected to the third connection area C3 by a type B connection unit 102 (described later), and a second busbar 144C is connected to the third connection area C3 by a type C connection unit 102 (described later).

[0047] Therefore, the connection unit 102 has first to third connection areas C1 to C3 outside the upper tank 106A as connection areas for three bus lines. More specifically, the first connection area C1 for one line is formed above the upper tank 106A, and the second and third connection areas C2, C3 for two lines are formed behind the upper tank 106A. The second and third connection areas C2, C3 are arranged next to each other above and below.

[0048] The fixed terminal connecting conductor 148A is connected to the connection fixed terminal 138 via a branch conductor 153 provided in the vertical middle portion. The fixed terminal connecting conductor 148A is supported in the vertical middle portion by a support body 154 formed of a support insulator and a frame.

[0049] The fixed terminal connecting conductor 148A is connected at its upper end (one end) to the first busbar connecting bushing 146A, then bent and extends downward, and bent again below the upper tank 106A to form a generally U-shape. The lower end (other end) of the fixed terminal connecting conductor 148A is connected to the connection terminal 108a on the upper tank 106A side of the earthing switch-equipped disconnector 108 described above. Therefore, the fixed terminal connecting conductor 148A forms a current path connecting the power distribution circuit of the main unit 101 including the earthing switch-equipped disconnector 108 and the first busbar 143A.

[0050] The movable terminal connecting conductor 151A has one end connected to the second busbar connecting bushing 150A, extends upward, and is then bent so that the other end faces forward, forming a generally angled shape. A rotation support portion 142 is provided at the other end (front end) of the movable terminal connecting conductor 151A, and rotation of the movable terminal 137 is permitted via the rotation support portion 142, ensuring electrical continuity between the movable terminal connecting conductor 151A and the movable terminal 137. The movable terminal connecting conductor 151A is supported at its upper portion extending in the front-to-rear direction by a support body 156A formed of a support insulator and a frame.

[0051] In earthing switch-equipped disconnector switch 136, movable terminal 137 is rotated approximately in the 4 o'clock direction as shown by the solid line in Fig. 5, and is thus separated from both fixed connection terminal 138 and fixed grounding terminal 139. In this state, the current path connecting the power distribution circuit of main unit 101 and first bus bar 143A is separated from the current path through second bus bar 144A, resulting in a disconnected state.

[0052] 5, the tip of movable terminal 137 comes into contact with fixed connection terminal 138. In this state, movable terminal connecting conductor 151A and fixed terminal connecting conductor 148A are electrically connected, and the current path connecting the power distribution circuit of main unit 101 and first bus bar 143A and the current path through second bus bar 144A are electrically connected to each other, resulting in a connected state.

[0053] 5, the tip of the movable terminal 137 comes into contact with the grounding fixed terminal 139. In this state, the current path through the second bus 144A becomes the ground potential, and the terminal is in a grounded state.

[0054] Therefore, in the earthing switch-equipped disconnector 136, the movable terminal 137 is brought into contact with and separated from the fixed connection terminal 138 and the fixed grounding terminal 139 by rotation of the movable terminal 137, and this contact and separation switches between the disconnected state, connected state, and grounded state described above.

[0055] Next, the link mechanism 160 that transmits the drive force of the operating mechanism 141 to the earthing switch-equipped disconnector 136 will be described. Fig. 8 is a schematic perspective view of the link mechanism. The link mechanism 160 includes a first link 161, a first lever 162, a rod 163, a second lever 164, and a second link 165 that are roughly arranged side by side from the lower left to the upper right in Fig. 8. The link mechanism 160 transmits the rotational operation of the lever (not shown) of the operating mechanism 141 to the movable terminal 137 to rotate it. The link mechanism 160 has a common configuration that is common to the A to C types of connection units 102.

[0056] In the link mechanism 160, the first link 161 is formed by two bars extending in the left-right direction, and sandwiches the first lever 162 at its right end. An operating shaft 171 is provided at the left end of the first link 161, and the operating shaft 171 moves in the left-right direction when the lever of the operating mechanism 141 is rotated. A first pin 172 is provided at the right end of the first link 161, and connects the first link 161 and the first lever 162 so that they can rotate relative to each other.

[0057] The first lever 162 is formed by a plate that is roughly in the shape of a right triangle when viewed from the front-to-rear direction. A right-angled corner of the first lever 162 is disposed approximately directly above the first pin 172, and the first lever 162 is rotatably supported at this corner via a first conversion shaft 173 that extends in the front-to-rear direction. Therefore, the first lever 162 and the first link 161 are connected via the first pin 172 approximately directly below the first conversion shaft 173.

[0058] First lever 162 has an acute-angled corner formed a predetermined distance to the right of the right-angled corner, and first spherical bearing 175 is provided on the rear side of this acute-angled corner. Second spherical bearing 176 is disposed above first spherical bearing 175, and both ends of rod 163 extending in the vertical direction are supported by each of spherical bearings 175, 176. Second spherical bearing 176 is provided on second lever 164. With both ends of rod 163 supported by each of spherical bearings 175, 176, the relative angle between first lever 162 and second lever 164 can be arbitrarily changed, and driving operation is transmitted from first lever 162 to second lever 164.

[0059] The second lever 164 is formed by a plate that is roughly in the shape of a right triangle when viewed from the left and right direction. The second lever 164 has an acute-angled corner formed a predetermined distance in front of the right-angled corner, and a second spherical bearing 176 is provided on the left side of this acute-angled corner.

[0060] The second lever 164 is rotatably supported at a right-angle corner via a second conversion shaft 177 extending in the left-right direction. The second lever 164 has an acute-angle corner formed a predetermined distance below the right-angle corner, and the front end of the second link 165 is connected to this acute-angle corner via a second pin 178 so as to be relatively rotatable. The second link 165 is formed by two bars extending in the front-rear direction, and sandwiches the second lever 164 at its front end.

[0061] Although not shown, the rear end side of the second link 165 is connected to the movable terminal 137 of the earthing switch equipped disconnector 136. In response to the operation of the second link 165, the movable terminal 137 is rotated.

[0062] Next, an example will be described of the operation of switching the earthing switch-equipped disconnector switch 136 from the disconnected state to the connected state by the link mechanism 160. The same operation is performed when switching from the grounded state to the disconnected state, and the same operation is possible when switching from the connected state to the disconnected state or from the disconnected state to the earthed state, but in the opposite direction.

[0063] When operating from the disconnected state to the connected state, the operating shaft 171 is moved in the direction of arrow S1 by rotating the lever (not shown) of the operating mechanism 141 clockwise as viewed from the front (front). This movement also moves the first link 161 and the first pin 172 in the direction of arrow S1, and the first lever 162 is rotated in the direction of arrow S2 around the first conversion shaft 173.

[0064] Rotation of first lever 162 in the direction of arrow S2 moves first spherical bearing 175, rod 163, and second spherical bearing 176 in the direction of arrow S3. During this movement, in first spherical bearing 175, first lever 162 and rod 163 rotate relatively around a central axis extending in the front-to-rear direction, and in second spherical bearing 176, rod 163 and second lever 164 rotate relatively around a central axis extending in the left-to-right direction.

[0065] Movement of second spherical bearing 176 in the direction of arrow S3 causes second lever 164 to rotate in the direction of arrow S4 around second conversion shaft 177. This rotation causes second pin 178 and second link 165 to move in the direction of arrow S5, causing movable terminal 137 connected to second link 165 to rotate forward, and earthing switch-equipped disconnector switch 136 to be operated into the connected state.

[0066] Next, a B-type connection unit 102 according to the present embodiment will be described with reference to Fig. 9. Fig. 9 is a partial schematic cross-sectional view of the B-type connection unit. Note that, for the B-type connection unit 102 and a C-type connection unit 102 described later, explanations of configurations common to the A-type connection unit 102 may be simplified or omitted. A gas-insulated switchgear 100 equipped with a B-type connection unit 102 is configured as a second gas-insulated switchgear.

[0067] 9, the top wall 133B of the upper tank 106B (second tank) in the connection unit 102 has a crank-shaped stepped shape when viewed from the left and right, with the rear being higher than the front. Therefore, the rear internal space of the upper tank 106B is expanded upward compared to the A-type upper tank 106A. The upper ends of the side walls 134B are shaped to match the shape of the top wall 133B.

[0068] The first busbar 143B (busbar) connected to the connection unit 102 is connected to the first busbar connector 145B in a second connection region C2, which is the lower half region of the rear wall 132B of the upper tank 106B. A first busbar connection bushing 146B is provided penetrating the rear wall 132B, and the first busbar 143B is connected to the first busbar connection bushing 146B via the first busbar connector 145B. The first busbar connection bushing 146B is connected to a fixed terminal connecting conductor 148B inside the upper tank 106B. This brings the first busbar 143B and the fixed terminal connecting conductor 148B into an electrically conductive state.

[0069] 9, the first busbar connector 145B and the first busbar connecting bushing 146B corresponding to three phases are arranged similarly to the A-type second busbar connector 149A and the second busbar connecting bushing 150A. Therefore, the first busbar connector 145B and the first busbar connecting bushing 146B corresponding to three phases are arranged side by side in the vertical direction and are arranged so as not to overlap each other in the horizontal direction.

[0070] The second busbar 144B (busbar) connected to the connection unit 102 is connected to a second busbar connector 149B in a third connection region C3, which is the upper half region of the rear wall 132B of the upper tank 106B. A second busbar connection bushing 150B is provided penetrating the rear wall 132B, and the second busbar 144B is connected to the second busbar connection bushing 150B via the second busbar connector 149B. The second busbar connection bushing 150B is connected to a movable terminal connecting conductor 151B inside the upper tank 106B. This brings the second busbar 144B and the movable terminal connecting conductor 151B into an electrically conductive state.

[0071] 9, the second busbar connector 149B and the second busbar connection bushing 150B corresponding to the three phases are arranged side by side in the vertical direction and are arranged so as not to overlap with the first busbar connector 145B and the first busbar connection bushing 146B in the vertical direction. The second busbar connector 149B and the second busbar connection bushing 150B corresponding to the three phases are also arranged so as not to overlap with each other in the horizontal direction. In the B-type connection unit 102, the first connection region C1 is an empty region where the busbars are not connected.

[0072] The fixed terminal connecting conductor 148B is connected to the connection fixed terminal 138 via a branch conductor 153 provided at the front upper end portion. The fixed terminal connecting conductor 148B is supported at its front portion by a support body 154 formed of a support insulator and a frame.

[0073] The fixed terminal connecting conductor 148B is connected at its rear end (one end) to the first busbar connecting bushing 146B, then bent and extended forward, and bent again in front of the upper tank 106A to form a generally U-shape. The fixed terminal connecting conductor 148B is connected at its lower region to the connection terminal 108a on the upper tank 106B side of the earthing switch-equipped disconnector 108 described above. Thus, the fixed terminal connecting conductor 148B forms a current path connecting each device of the main unit 101, including the earthing switch-equipped disconnector 108, to the first busbar 143B.

[0074] The movable terminal connecting conductor 151B is connected at one end to the second busbar connecting bushing 150B, bent to extend forward, and bent again to point the other end downward, forming a generally crank-like shape. A rotation support portion 142 is provided at the other end (lower end) of the movable terminal connecting conductor 151B, and the rotation support portion 142 allows the movable terminal 137 to rotate while ensuring electrical continuity between the movable terminal connecting conductor 151B and the movable terminal 137. The movable terminal connecting conductor 151B is supported at its portion extending in the front-rear direction by a support body 156B formed of a support insulator and a frame.

[0075] The change in state (disconnected state, connected state, grounded state) according to the rotation position of the movable terminal 137 is the same as that of the A-type connection unit 102, and therefore a description thereof will be omitted.

[0076] Next, a C-type connection unit 102 according to the present embodiment will be described with reference to Fig. 10. Fig. 10 is a partial schematic cross-sectional view of the C-type connection unit. The gas-insulated switchgear 100 equipped with the C-type connection unit 102 is configured as a third gas-insulated switchgear.

[0077] 10, the top wall 133C of the upper tank 106C (second tank) in the connection unit 102 is formed in a crank shape similar to the top wall 133B of Type B. Therefore, like the upper tank 106B of Type B, the upper tank 106C has an internal space that expands upward at the rear compared to the upper tank 106A of Type A. The upper end of the side wall 134C is formed in the same shape as the upper end of the side wall 134B of Type B.

[0078] The first busbar 143C (busbar) connected to the connection unit 102 is connected to the first busbar connector 145C in a first connection region C1, which is an upper region of the top wall 133C, similar to the A-type first busbar 143A. A first busbar connection bushing 146C is provided penetrating the top wall 133C, and the first busbar 143C is connected to the first busbar connection bushing 146C via the first busbar connector 145C. The first busbar connection bushing 146C is connected to a fixed terminal connecting conductor 148C inside the upper tank 106C. This brings the first busbar 143C and the fixed terminal connecting conductor 148C into an electrically conductive state.

[0079] When viewed from the left and right as in Fig. 10, the three-phase first busbar connectors 145C and the first busbar connecting bushings 146C are arranged side by side in the front-rear direction. Furthermore, the three-phase first busbar connectors 145C are arranged so as not to overlap each other in the left-right direction, similar to the A-type first busbar connector 145A (see Fig. 6).

[0080] The second busbar 144C (busbar) connected to the connection unit 102 is connected to a second busbar connector 149C in a third connection region C3, which is the upper half region of the rear wall 132C of the upper tank 106C, similar to the B-type second busbar 144B. A second busbar connection bushing 150C is provided penetrating the rear wall 132C, and the second busbar 144C is connected to the second busbar connection bushing 150C via the second busbar connector 149C. The second busbar connection bushing 150C is connected to a movable terminal connecting conductor 151C inside the upper tank 106C. This brings the second busbar 144C and the movable terminal connecting conductor 151C into an electrically conductive state.

[0081] 10, the second busbar connectors 149C and the second busbar connection bushings 150C corresponding to the three phases are arranged side by side in the vertical direction and are arranged so as not to overlap each other in the horizontal direction. In the C-type connection unit 102, the second connection region C2 is an empty region where the busbars are not connected.

[0082] The fixed terminal connecting conductor 148C is connected to the connection fixed terminal 138 via a branch conductor 153 provided in the vertical middle portion. The fixed terminal connecting conductor 148C is supported in the vertical middle portion by a support body 154 formed of a support insulator and a frame.

[0083] The fixed terminal connecting conductor 148C is formed in the same shape as the A-type fixed terminal connecting conductor 148A. The fixed terminal connecting conductor 148C is connected at its upper end (one end) to the first busbar connecting bushing 146C, then bent and extends downward, and bent again below the upper tank 106C, thereby forming a generally U-shape. The lower end (other end) of the fixed terminal connecting conductor 148C is connected to the connection terminal 108a on the upper tank 106C side of the earthing switch-equipped disconnector 108 described above. Therefore, the fixed terminal connecting conductor 148C forms a current path connecting each device of the main unit 101, including the earthing switch-equipped disconnector 108, to the first busbar 143C.

[0084] The movable terminal connecting conductor 151C has one end connected to the second busbar connecting bushing 150C, extends downward, and is then bent so that the other end faces forward, forming a generally angled shape. A rotation support portion 142 is provided at the other end (front end) of the movable terminal connecting conductor 151C, and rotation of the movable terminal 137 is permitted via the rotation support portion 142, ensuring electrical continuity between the movable terminal connecting conductor 151C and the movable terminal 137. The movable terminal connecting conductor 151C is supported at its portion extending in the front-rear direction by a support body 156C constituted by a support insulator and a frame.

[0085] The change in state (disconnected state, connected state, grounded state) according to the rotation position of the movable terminal 137 is the same as that of the A-type connection unit 102, and therefore a description thereof will be omitted.

[0086] As described above, the gas-insulated switchgear 100 of the present embodiment is configured by selecting one of the connection units 102 of type A, type B, or type C, which have a common configuration but are configured differently overall. As a result, in this embodiment, for the first to third configurations described above (see FIGS. 1 to 3), it is possible to configure power receiving and distribution equipment as shown in FIGS. 11 to 14. FIG. 11 is a unit configuration diagram that three-dimensionally illustrates the power receiving and distribution equipment of the first configuration according to the embodiment. FIG. 12 is a unit configuration diagram that three-dimensionally illustrates the power receiving and distribution equipment of the second configuration according to the embodiment. FIGS. 13 and 14 are unit configuration diagrams that three-dimensionally illustrate the power receiving and distribution equipment of the third configuration according to the embodiment. Note that in the unit configuration diagrams of FIGS. 11 to 14, some of the devices of the first to third configurations shown in FIGS. 1 to 3 may be omitted.

[0087] As shown in Fig. 11, the power receiving and distribution equipment of the first configuration of the present embodiment can be configured by arranging five units, each of which forms a single panel, in a row using the above-mentioned gas-insulated switchgear 100. More specifically, the power receiving and distribution equipment of the first configuration in Fig. 11 is arranged, from left to right, with a feeder unit U111, a feeder unit U112, a VCT unit U113, a regular power receiving unit U114, and a standby power receiving unit U115.

[0088] In the power receiving and distribution equipment of Fig. 11, the feeder unit U112 and the regular power receiving unit U114 are configured with gas-insulated switchgear 100 equipped with A-type connection units 102. Furthermore, the feeder unit U111 and the standby power receiving unit U115 are configured with gas-insulated switchgear 100 equipped with C-type connection units 102. The feeder unit U011 and the bypass unit U015 of Fig. 15 are integrated in the feeder unit U111, thereby reducing one surface compared to the conventional system of Fig. 15. Furthermore, by directly connecting the feeder unit U111 and the standby power receiving unit U115, the bypass unit U013 of Fig. 15 is eliminated, thereby reducing one surface compared to the conventional system of Fig. 15.

[0089] In this embodiment, the number of surfaces of the power receiving and distribution equipment of the first configuration, which conventionally has seven surfaces (see FIG. 15), can be reduced to five surfaces.

[0090] As shown in Fig. 12, the power receiving and distribution equipment of the second configuration of the present embodiment can be configured by arranging eight units, each of which forms a single panel, in a row, using the above-mentioned gas-insulated switchgear 100. More specifically, the power receiving and distribution equipment of the second configuration in Fig. 12 is arranged, from left to right, with a standby power receiving unit U121, a VCT unit U122, an EVT·LA unit U123, a feeder unit U124, a feeder unit U125, an EVT·LA unit U126, a VCT unit U127, and a regular power receiving unit U128.

[0091] In the power receiving and distribution equipment of Fig. 12, feeder unit U124 and feeder unit U125 are configured with gas-insulated switchgear 100 equipped with A-type connection units 102. In feeder unit U124, feeder unit U024 and busbar connection unit U025 of Fig. 16 are integrated, thereby reducing the number of panels by one compared to the conventional system of Fig. 16. In addition, in feeder unit U125, busbar connection unit U026 and feeder unit U027 of Fig. 16 are integrated, thereby reducing the number of panels by one compared to the conventional system of Fig. 16.

[0092] In this embodiment, the number of surfaces of the power receiving and distribution equipment of the second configuration, which conventionally has 10 surfaces (see FIG. 16), can be reduced to 8 surfaces.

[0093] As shown in Fig. 13, the power receiving and distribution equipment of the third configuration of this embodiment can be configured by arranging six units, each of which forms a single panel, using the above-mentioned gas-insulated switchgear 100, side by side, or as shown in Fig. 14, by arranging eight units, each of which forms a single panel, using the above-mentioned gas-insulated switchgear 100, side by side. The power receiving and distribution equipment of Fig. 13 is arranged under conditions that do not take into account separate updating of the normal and standby systems, and can be configured without external cables by arranging the receiving panels and feeders as side by side panels. The power receiving and distribution equipment of Fig. 14 is arranged under conditions that take into account separate updating of the normal and standby systems, and the busbars between the feeders must be configured with external cables.

[0094] The power receiving and distribution equipment of the third configuration in Figure 13 is arranged, from left to right, as an EVT·LA unit U131, a feeder unit U132, a feeder unit U133, an EVT·LA unit U134, a bypass DS unit U135, a VCT unit U136, a regular power receiving unit U137, and a standby power receiving unit U138.

[0095] In the power receiving and distribution facility of Fig. 13, the regular power receiving unit U137 and the feeder unit U133 are configured by gas-insulated switchgear 100 equipped with a C-type connection unit 102. The feeder unit U132 and the standby power receiving unit U138 are configured by gas-insulated switchgear 100 equipped with a B-type connection unit 102.

[0096] In the power receiving and distribution facility of FIG. 13, the number of surfaces can be reduced to eight in the third configuration of the power receiving and distribution facility, which conventionally had 12 surfaces (see FIG. 17).

[0097] The third configuration of the power receiving and distribution equipment in Figure 14 is arranged, from left to right, as an EVT·LA unit U141, a feeder unit U142, a bypass DS unit U143, a standby power receiving unit U144, a regular power receiving unit U145, a VCT unit U146, a feeder unit U147, and an EVT·LA unit U148.

[0098] In the power receiving and distribution equipment of Fig. 14, the feeder unit U142 and the standby power receiving unit U144 are configured by gas-insulated switchgear 100 equipped with a type B connection unit 102. The regular power receiving unit U145 and the feeder unit U147 are configured by gas-insulated switchgear 100 equipped with a type C connection unit 102.

[0099] In the feeder unit U142, the busbar connecting unit U03A and the feeder unit U03B in FIG. 17 are integrated, thereby reducing one surface compared to the conventional system shown in FIG. 17. In the standby power receiving unit U144, the standby power receiving unit U032 and the busbar connecting unit U033 in FIG. 17 are integrated, thereby reducing one surface compared to the conventional system shown in FIG. 17. In the regular power receiving unit U145, the regular power receiving unit U035 and the busbar connecting unit U034 in FIG. 17 are integrated, thereby reducing one surface compared to the conventional system shown in FIG. 17. In the feeder unit U147, the feeder unit U038 and the busbar connecting unit U039 in FIG. 17 are integrated, thereby reducing one surface compared to the conventional system shown in FIG. 17.

[0100] In this embodiment, the number of surfaces of the power receiving and distribution equipment of the third configuration, which conventionally has 12 surfaces (see FIG. 17), can be reduced to 8 surfaces.

[0101] One of the reasons why the present embodiment can achieve a reduction in the number of panels as described above is that the gas-insulated switchgear 100 allows the connection unit 102 to be selected from three types: Type A, Type B, and Type C. This allows the power receiving and distribution equipment to be configured with increased flexibility in the layout of the first busbars 143A, 143B, and 143C and the second busbars 144A, 144B, and 144C. In the gas-insulated switchgear 100 constituting such a power receiving and distribution equipment, the main unit 101 and the connection unit 102 are arranged vertically, so the number of panels in the row number arrangement can be reduced compared to conventional equipment. This allows the installation area of ​​the power receiving and distribution equipment to be reduced.

[0102] In addition, a first connection area C1 for one circuit is formed above the upper tank 106, and second and third connection areas C2, C3 for two circuits are formed behind the upper tank 106. This allows the busbars 143A, 143B, 143C, 144A, 144B, 144C to be arranged by effectively utilizing the areas in two different directions above and behind the upper tank 106, thereby further increasing the degree of freedom in busbar layout.

[0103] Furthermore, in the A-type connection unit 102, the first busbar 143A is connected in the second connection area C2, and the third connection area C3 is an empty area with no busbar connected to it. In addition, in the C-type connection unit 102, the second busbar 144C is connected in the third connection area C3, and the second connection area C2 is an empty area with no busbar connected to it. This allows busbars connected to other gas-insulated switchgears 100 to pass through the empty second connection area C2 or third connection area C3, which also increases the degree of freedom in busbar layout.

[0104] Furthermore, the three types of connection units 102 (Type A, Type B, and Type C) share common parts in the configuration of the disconnector with earthing switch 136, the link mechanism 160, and parts of the upper tanks 106A, 106B, and 106C, etc. This reduces the number of parts and assembly steps, and simplifies the configuration.

[0105] The present invention is not limited to the above-described embodiment, and various modifications can be made to the embodiment. In the above-described embodiment, the size, shape, orientation, etc. shown in the accompanying drawings are not limited to these, and can be modified as appropriate within the scope of the effects of the present invention. In addition, the present invention can be modified as appropriate without departing from the scope of the object of the present invention.

[0106] In the above embodiment, the first to third connection areas C1 to C3 are formed outside the upper tank 106 as connection areas for three bus lines, but it is also possible to form connection areas for four or more lines, such as by forming further connection areas above the upper tank 106.

[0107] The first to third configurations of the power receiving and distribution equipment described above are merely examples, and the gas-insulated switchgear 100 of this embodiment may be used in power receiving and distribution equipment of other configurations. The power receiving and distribution equipment of the present invention may include at least one gas-insulated switchgear 100 equipped with any one of the A-type, B-type, and C-type connection units 102.

[0108] Furthermore, the earthing switch and the disconnector may be configured separately in the earthing switch-equipped disconnector switches 108, 112, and 136. Furthermore, the earthing switch-equipped disconnector switch 136 can be modified in various ways as long as the movable terminal 137 is rotatable, and the fixed terminals 138 and 139 may be located in other positions. [Explanation of symbols]

[0109] 100: Gas insulated switchgear 101: Main unit 102: Connection unit 105: Lower tank (first tank) 106: Upper tank (second tank) 106A: Upper tank (second tank) 106B: Upper tank (second tank) 106C: Upper tank (second tank) 111: Vacuum circuit breaker (equipment) 112: Disconnector with earthing switch (equipment) 113: Grounding switch (machine type) 136: Grounding switch auxiliary circuit breaker (circuit breaker) 137: Movable terminal 138: Fixed terminal for connection (fixed terminal) 143A: Busbar No. 1 (busbar) 143B: Busbar 1 (bus) 143C: Busbar 1 (bus) 144A: Second busbar (busbar) 144B: Second busbar (busbar) 144C: ​​Second busbar (busbar) C1: First Connection Domain (Connection Domain) C2: 2nd connecting area (connecting area, lower connecting area) C3: The third connecting area (connecting area, upper connecting area)

Claims

1. a main unit having a first tank filled with insulating gas and devices disposed inside the first tank for opening and closing a power distribution circuit; A gas-insulated switchgear including a second tank filled with insulating gas, and a connection unit having a disconnector disposed inside the second tank for switching between a disconnected state and a connected state between the power distribution circuit and a bus bar, The main unit and the connection unit are vertically aligned and integrated, the disconnector includes a movable terminal that is rotatably provided, and a fixed terminal that is brought into contact with and separated from the movable terminal by the rotation of the movable terminal, and switches between the disconnected state and the connected state by the contact and separation; the connection unit has connection areas for at least three busbars outside the second tank; The gas-insulated switchgear according to claim 1, wherein the connection area is formed behind the second tank for two circuits and above the second tank for one circuit.

2. 2. The gas-insulated switchgear according to claim 1, wherein the connection area for two circuits at the rear of the second tank includes an upper connection area and a lower connection area arranged side by side.

3. the busbar is connected to the connection region for one circuit above the second tank and to one of the upper connection region and the lower connection region behind the second tank; 3. The gas-insulated switchgear according to claim 2, wherein the busbar is not connected to the other of the upper connection region and the lower connection region.

4. 4. The gas-insulated switchgear according to claim 1, wherein the movable terminal is disposed in a central region of the second tank in both the up-down direction and the front-rear direction.

5. A power receiving and distribution facility having a plurality of gas-insulated switchgears according to claim 2, the plurality of gas-insulated switchgears include at least one of a first gas-insulated switchgear, a second gas-insulated switchgear, and a third gas-insulated switchgear, the connection unit of the first gas-insulated switchgear is configured such that the busbars are connected to the connection region for one circuit above the second tank and the lower connection region, respectively; the connection unit of the second gas-insulated switchgear has the bus bars connected to the upper connection region and the lower connection region, respectively; The power receiving and distribution facility is characterized in that the connection unit of the third gas-insulated switchgear is configured so that the busbars are connected to the connection area for one circuit above the second tank and the upper connection area, respectively.

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