Gas-insulated switchgear

Abstract

To reduce the number of surfaces when configuring power receiving and distribution equipment, thereby simplifying the configuration. [Solution] The gas-insulated switchgear (100) comprises a main unit (101) and a connection unit (102) which are arranged vertically and integrated. The main unit has a lower tank (105) filled with insulating gas and a vacuum circuit breaker (111), etc., which is located inside the lower tank and opens and closes the power distribution circuit. The connection unit has an upper tank (106) filled with insulating gas and a disconnector with an earthing switch (136) located inside the upper tank that switches between disconnected and connected states between the power distribution circuit and each busbar (143A, 144A). The disconnector with an earthing switch has a rotatably provided movable terminal (137) and a fixed connection terminal (138) which connects to and disconnects from the movable terminal by the rotation of the movable terminal. The connection unit has three busbar connection areas (C1~C3) outside the upper tank.

Description

Technical Field

[0001] The present invention relates to a gas-insulated switchgear used for power transmission, distribution, and reception.

Background Art

[0002] Patent Document 1 discloses a gas-insulated switchgear that houses a vacuum circuit breaker and a plurality of circuit breaker / ground switches in a tank. When configuring a power reception facility using a plurality of such gas-insulated switchgears, for example, a voltage transformer for measurement of power transaction volume (hereinafter referred to as "VCT") is bypassed between a power reception unit that receives power through two normal standby lines and two load units.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the power reception facility having the above-described configuration, there is a problem that the installation area of the gas-insulated switchgear, which is arranged in a row with an increased number of faces (panels), such as providing a circuit breaker unit to bypass the VCT unit, becomes large. Further, in a power reception facility using a plurality of gas-insulated switchgears, while reducing the number of faces and arranging a plurality of types in a column number, reduction of the number of parts and assembly man-hours is required by commonalizing the configurations of each gas-insulated switchgear.

[0005] The present invention has been made in view of such circumstances, and an object thereof is to provide a gas-insulated switchgear that can reduce the number of faces when configuring a power transmission and reception facility and can simplify the configuration.

Means for Solving the Problems

[0006] A gas-insulated switchgear according to one embodiment of the present invention comprises a main unit having a first tank filled with insulating gas and equipment arranged inside the first tank for opening and closing a power distribution circuit, and a connection unit having a second tank filled with insulating gas and a disconnector arranged inside the second tank for switching between a disconnected state and a connected state between the power distribution circuit and a busbar, wherein the main unit and the connection unit are arranged vertically and integrated, the disconnector comprises a rotatably provided movable terminal and a fixed terminal that moves toward and toward the movable terminal by the rotation of the movable terminal, and switches between the disconnected state and the connected state by the movement toward and from the movable terminal, and the connection unit has at least three busbar connection areas outside the second tank, and is provided on the front side of the connection unit for operating the rotation of the movable terminal and a link mechanism that transmits the rotation operation of the operating mechanism to the movable terminal and rotates the movable terminal along the front-rear direction. The link mechanism comprises a first link that moves in the left-right direction by the rotational operation of the operating mechanism, a first lever formed by a plate that rotates by the left-right movement of the first link, a rod, a second lever formed by a plate that rotates when the drive from the rotation of the first lever is transmitted via the rod, and a second link that moves in the front-rear direction by the rotation of the second lever to rotate the movable terminal, wherein the rod is provided so that the relative angle between the first lever and the second lever can be arbitrarily changed, and the relative rotation around a central axis extending in the front-rear direction with respect to the first lever is transmitted as relative rotation around a central axis extending in the left-right direction with respect to the second lever. It is characterized by the following. [Effects of the Invention]

[0007] According to the present invention, having a busbar connection area for at least three circuits in the connection unit increases the flexibility of the busbar layout when configuring power distribution equipment with 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 equipment. Furthermore, by selecting and utilizing a busbar connection area for at least three circuits, it is possible to standardize parts among multiple gas-insulated switchgears that make up the power distribution equipment, thereby reducing the number of parts and assembly man-hours and simplifying the configuration. [Brief explanation of the drawing]

[0008] [Figure 1] This is a circuit diagram of the first configuration of the power receiving and distribution equipment according to the embodiment. [Figure 2] This is a circuit diagram of the second configuration of the power receiving and distribution equipment according to the embodiment. [Figure 3] This is a circuit diagram of the third configuration of the power receiving and distribution equipment according to the embodiment. [Figure 4] This is a partial schematic cross-sectional view showing the internal configuration of a gas-insulated switchgear according to an embodiment. [Figure 5] This is a schematic cross-sectional view of a Type A connection unit. [Figure 6] This is a view of the Type A connection unit from above. [Figure 7] This is a rear view of the Type A connection unit. [Figure 8] This is a schematic perspective view of the linkage mechanism. [Figure 9] This is a schematic cross-sectional view of a Type B connection unit. [Figure 10] This is a schematic cross-sectional view of a Type C connection unit. [Figure 11] This is a unit configuration diagram showing the power receiving and distribution equipment of the first configuration in three dimensions. [Figure 12] This is a unit configuration diagram showing the second configuration of the power receiving and distribution equipment in three dimensions. [Figure 13] This is a unit configuration diagram showing the power receiving and distribution equipment of the third configuration described above in three dimensions. [Figure 14] This is a unit configuration diagram showing the power receiving and distribution equipment of the third configuration described above in three dimensions. [Figure 15] This is a diagram of a conventional unit configuration in the first configuration of power receiving and distribution equipment. [Figure 16] This is a diagram of the conventional unit configuration in the second configuration of the power receiving and distribution equipment. [Figure 17] This is a diagram of a conventional unit configuration in a power distribution facility with a third configuration. [Modes for carrying out the invention]

[0009] The following will describe in detail a power distribution facility using a gas-insulated switchgear according to an embodiment of the present invention, with reference to the attached drawings. It should be noted that the present invention is not limited to the embodiments described below, and can be modified as appropriate without altering its essence. In the following drawings, some components may be omitted for the sake of clarity.

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

[0011] The power receiving and distributing equipment of the first configuration in FIG. 1 is normal and standby power reception (with 1VCT and bypass DS), the power receiving and distributing equipment of the second configuration in FIG. 2 is normal and standby power reception (with 2CB, 2VCT, and bus tie DS), and the power receiving and distributing equipment of the third configuration in FIG. 3 is normal and standby power reception (with 1VCT, bypass DS, and bus tie DS). The power receiving and distributing equipment using the gas-insulated switchgear of this embodiment can adopt various configurations other than the first to third configurations. However, in this embodiment, the first to third configurations will be described as examples.

[0012] As shown in FIG. 1, the power receiving and distributing equipment of the first configuration is connected via a three-phase current transformer 11, a voltage detector 12, an earthing switch 13, and a vacuum circuit breaker 14 from the entrance of the power system on the power receiving side in both the normal power reception and standby power reception circuits. Circuit breakers 17 and 18 with earthing switches are provided on both sides of the vacuum circuit breaker 14.

[0013] Between the normal power reception and standby power reception, the first bypass circuit 20 and the second bypass circuit 21 are connected in sequence from the power receiving side to the load side. A VCT 23 and a bypass circuit breaker 24 are connected between the first bypass circuit 20 and the second bypass circuit 21. Circuit breakers 25 and 26 with earthing switches are provided on both sides of the VCT 23.

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

[0015] In the first configuration of the power receiving and distribution equipment shown in the circuit diagram of Figure 1, the configuration shown in Figure 15 was conventionally adopted. Figure 15 is a conventional unit configuration diagram for the first configuration. As shown in Figure 15, the conventional first configuration of power receiving and distribution equipment had seven units, each constituting a panel, arranged in a row, resulting in seven faces. More specifically, from left to right in Figure 15, the feeder unit U011, feeder unit U012, bypass unit U013, VCT unit U014, bypass unit U015, normal power receiving unit U016, and backup power receiving unit U017 were arranged.

[0016] Next, the power distribution equipment of the second configuration will be explained with reference to Figure 2. In the second configuration and the third configuration described later, equipment common to the first configuration will be denoted by the same reference numerals.

[0017] As shown in Figure 2, in the second configuration of the power receiving and distribution equipment, both the normal power receiving and backup power receiving circuits are connected from the inlet of the power system on the receiving side via a three-phase current transformer 11, a voltage detector 12, a grounding switch 13, a disconnector with a 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 backup power receiving are connected by a busbar communication circuit 22, and a disconnector with a grounding switch 18 is provided between the VCT 23 and the busbar communication circuit 22.

[0018] The busbar connection circuit 22 is provided with two busbar connection disconnectors 27a and 27b, each consisting of a disconnector with a grounding switch. On the load side of the busbar connection circuit 22, there are two circuits 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. In addition, a grounding instrument transformer 33 and a surge arrester 34 are connected to each of these two circuits.

[0019] In the power distribution equipment of the second configuration shown in the circuit diagram of Figure 2, the configuration shown in Figure 16 was conventionally adopted. Figure 16 is a conventional unit configuration diagram for the second configuration. As shown in Figure 16, the conventional power distribution equipment of the second configuration had 10 units, each constituting a panel, arranged in a row, resulting in 10 faces. More specifically, from left to right in Figure 16, the following were arranged: the regular power receiving unit U021, the VCT unit U022, the EVT / LA unit U023, the feeder unit U024, the busbar connection unit U025, the busbar connection unit U026, the feeder unit U027, the EVT / LA unit U028, the VCT unit U029, and the backup power receiving unit U02A.

[0020] Next, the third configuration of the power receiving and distribution equipment will be explained with reference to Figure 3. As shown in Figure 3, the third configuration of the power receiving and distribution equipment uses first and second busbar connecting circuits 45 and 46, and is configured with two busbar connecting disconnectors 40 and 41, each consisting of a grounding switch, connected to the first and second busbar connecting circuits 45 and 46. In addition, a grounding type instrument transformer 43 and a surge arrester 44 are connected to each of the two circuits on the load side of the second busbar connecting circuit 46.

[0021] In the third configuration power distribution equipment shown in the circuit diagram of Figure 3, the configuration shown in Figure 17 was conventionally adopted. Figure 17 is a conventional unit configuration diagram for the third configuration. As shown in Figure 17, the conventional third configuration power distribution equipment had 12 units, each constituting a panel, arranged in a row, resulting in 12 faces. More specifically, from left to right in Figure 17, the bypass DS unit U031, the auxiliary power receiving unit U032, the busbar connection unit U033, the busbar connection unit U034, the regular power receiving unit U035, the VCT unit U036, the EVT / LA unit U037, the feeder unit U038, the busbar connection unit U039, the busbar connection unit U03A, the feeder unit U03B, and the EVT / LA unit U03C were arranged.

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

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

[0024] Figure 4 is a schematic cross-sectional view showing the internal configuration of a gas-insulated switchgear according to an embodiment. As shown in Figure 4, the gas-insulated switchgear 100 of this embodiment comprises a main unit 101 and a connection unit 102 arranged vertically. In the gas-insulated switchgear 100, the connection unit 102 is connected to the upper part of the main unit 101, and the main unit 101 and the connection unit 102 are arranged vertically and integrated. The main unit 101 and the connection unit 102 are housed in an external enclosure (not shown) with doors on the front and rear. In the configurations of the main unit 101 and the connection unit 102 described below, three units are provided for each of the three phases, except for the insulating board 104 and each tank 105, 106 which will be described later. However, in some drawings, only one unit may be shown as they are arranged on top of each other, and in some drawings, only one of the three units is given a reference numeral for each configuration.

[0025] The main unit 101 is equipped with a bottomed container-shaped insulating board 104 that functions as a partition at the boundary with the connecting unit 102. The main unit 101 is equipped with a lower tank 105 (first tank) that forms a sealed space below the insulating board 104. The connecting unit 102 is equipped with an upper tank 106 (second tank) that forms a sealed space above the insulating board 104. Each tank 105 and 106 is filled with an insulating gas such as sulfur hexafluoride (SF6) or dry air.

[0026] The main unit 101 includes a disconnect switch with a grounding switch 108 located inside the insulating board 104. The main unit 101 also includes a vacuum circuit breaker 111, a disconnect switch with a grounding switch 112, a grounding switch 113, and a surge arrester 114, which are located inside the lower tank 105 and serve to open and close the power distribution circuit. Each disconnect switch with a grounding 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 disconnector with grounding switch 108 is connected to a conductor 116 that passes through the insulating board 104 and energizes the vacuum circuit breaker 111. In other words, the disconnector with grounding switch 108 and the vacuum circuit breaker 111 are connected via the conductor 116. The disconnector with grounding switch 108 is provided so that the circuit can be switched between disconnecting, connecting, and grounding by an operating mechanism 117 located on the outside (front side) of the front wall 105a of the lower tank 105.

[0028] The vacuum circuit breaker 111 comprises a container 111a, a movable contact and a fixed contact (not shown) arranged inside the container 111a, a first connection terminal 111b, and a second connection terminal 111c. The vacuum circuit breaker 111 has the function of interrupting the current path between the first connection terminal 111b and the second connection terminal 111c, and the function of connecting and closing it. The movable contact of the vacuum circuit breaker 111 is driven by an operating mechanism 118 to move toward and away from the fixed contact, thereby switching between interruption and closing. 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 disconnector with earthing switch 112. The movable element 112a of the disconnector with earthing switch 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] In Figure 4, the movable element 112a of the disconnector with grounding switch 112 is separated from the grounding stator 112b and the connecting stator 112c at the position indicated by the solid line, and the circuit is disconnected in this state. The disconnector with grounding switch 112 grounds the circuit when the tip of the movable element 112a contacts the grounding stator 112b located above it. The connecting stator 112c, located below the movable element 112a, is connected to the conductor 121 that carries current to the main circuit cable 120. Therefore, the disconnector with grounding switch 112 establishes a connected state when the tip of the movable element 112a contacts 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 penetrate 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 grounding switch 113 and the surge arrester 114 are provided so as to be connectable to the conductor 121. The grounding switch 113 is driven by an operating mechanism 127 provided on the outside of the front wall 105a of the lower tank 105.

[0033] The main unit 101 described above is just one example, and depending on the function of the gas-insulated switchgear 100 in the power distribution equipment, the configuration may omit at least one of the devices that open and close the distribution circuit, such as the vacuum circuit breaker 111, the disconnector with grounding switch 112, and the grounding switch 113. Also, depending on the function of the gas-insulated switchgear 100 in the power distribution equipment, the configuration may omit the disconnector with grounding switch 108 and the surge arrester 114.

[0034] Next, the connection unit 102 will be described. In this embodiment, there are three types of connection unit 102, and these three types have different overall configurations, although they share some common components. Furthermore, 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 configurations shown in Figures 4 and 5 will be referred to as type A. The configuration shown in Figure 9 will be referred to as type B, and the configuration shown in Figure 10 will be referred to as type C. For configurations that differ among the three types of connection unit 102, "A," "B," and "C" will be added to the end of the reference numeral according to the type, while for configurations common to all three types, "A," "B," and "C" will not be added. Hereinafter, the connection unit 102 of this embodiment will be described in the order of type A, type B, and type C.

[0035] A gas-insulated switchgear 100 equipped with a type A connection unit 102 is configured as a first gas-insulated switchgear. The upper tank 106A (second tank) of the type A 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 off both the left and right sides of the front wall 131, the rear wall 132A, and the top wall 133A. Furthermore, the lower part of the upper tank 106A is separated from the lower tank 105 by the aforementioned insulating board 104, 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 positioned 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 positioned on the same plane. The top wall 133A of the upper tank 106A is formed in a flat shape parallel to the horizontal direction.

[0037] Figure 5 is a schematic cross-sectional view of a Type A connection unit. As shown in Figure 5, the connection unit 102 further includes a disconnector with a grounding switch 136 (disconnector) located inside the upper tank 106A. The disconnector with a grounding switch 136 includes a rotatable movable terminal 137, and a fixed connection terminal 138 (fixed terminal) and a fixed grounding terminal 139 that move toward and away from the rotatable movable terminal 137. In the disconnector with a grounding switch 136, the movable terminal 137 is operated to rotate via an operating mechanism 141 located on the outside of the front wall 131.

[0038] The movable terminal 137 is supported at its base end via a rotating support portion 142 so as to be rotatable within a predetermined angular range. In this embodiment, as shown in Figure 5 when viewed from the left and right directions, the movable terminal 137 is positioned in the central region in both the vertical and front-to-back directions of the upper tank 106A, and is provided so as to be rotatable between approximately the 2 o'clock and 6 o'clock directions. Furthermore, as shown by the solid line in Figure 5, when the movable terminal 137 is rotated to approximately the 4 o'clock position, the disconnector with grounding switch 136 becomes disconnected, with the movable terminal 137 separating from the connecting fixed terminal 138 and the grounding fixed terminal 139. This disconnected state will be described later.

[0039] When the movable terminal 137 is rotated in the 2 o'clock direction, its tip contacts the connecting fixed terminal 138. In other words, the connecting fixed terminal 138 is positioned relative to the pivot support portion 142, which is the pivot center of the movable terminal 137, in a forward and upward diagonal direction at the 2 o'clock position. The disconnector with grounding switch 136 becomes connected by the contact between the movable terminal 137 and the connecting fixed terminal 138, and this connected state will be described later.

[0040] When the movable terminal 137 is rotated to the 6 o'clock position, its tip contacts the fixed grounding terminal 139. In other words, the fixed grounding terminal 139 is positioned relative to the pivot support portion 142, which is the pivot center of the movable terminal 137, in a downward direction at the 6 o'clock position. The disconnector with grounding switch 136 becomes grounded by the contact between the movable terminal 137 and the fixed grounding terminal 139, and this grounding state will be described later.

[0041] The connection unit 102 is connected to the first busbar 143A (busbar) and the second busbar 144A (busbar). The first busbar 143A is connected to the first busbar connector 145A above the top wall 133A. The first busbar connection bushing 146A is provided through 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 the fixed terminal connection conductor 148A inside the upper tank 106A. As a result, the first busbar 143A and the fixed terminal connection conductor 148A are energized.

[0042] As shown in Figure 5, when viewed from the left-right direction, the first busbar connector 145A and the first busbar connection bushing 146A, which correspond to the three phases, are arranged side by side in the front-to-back direction. In the case of the first busbar connector 145A, which corresponds to the three phases, they are arranged so that they do not overlap with each other in the left-to-right direction (see Figure 6).

[0043] The second busbar 144A is connected to the second busbar connector 149A in the lower half of the rear wall 132A of the upper tank 106A. A second busbar connection bushing 150A is provided through 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 the movable terminal connection conductor 151A inside the upper tank 106A. As a result, the second busbar 144A and the movable terminal connection conductor 151A are energized.

[0044] As shown in Figure 5, when viewed from the left and right, the second busbar connector 149A and the second busbar connecting bushing 150A, which correspond to the three phases, are arranged side by side in the vertical direction and are positioned in roughly the lower half of the upper tank 106A. In addition, the second busbar connector 149A, which corresponds to the three phases, is arranged so that it does not overlap with each other in the left and right direction (see Figures 6 and 7).

[0045] Thus, 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 circuits, the first busbar 143A and the second busbar 144A. More specifically, the connection unit 102 forms a first connection area C1 outside the upper part of the upper tank 106A to which the first busbar 143A, which constitutes one circuit, is connected. In addition, the connection unit 102 forms a second connection area C2 (lower connection area) outside the lower rear part of the upper tank 106A to which the second busbar 144A, which constitutes one circuit, is connected.

[0046] Furthermore, the connection unit 102 forms a third connection area C3 (upper connection area) on the exterior of the rear upper half of the upper tank 106A, to which busbars 144B and 144C, which constitute one circuit as shown by the dashed line in Figure 5, can be connected. The third connection area C3 is an empty area where busbars are not connected. The second busbar 144B is connected to the third connection area C3 by a B-type connection unit 102, which will be described later, and the second busbar 144C is connected by a C-type connection unit 102, which will be described later.

[0047] Therefore, the connection unit 102 is equipped with first to third connection areas C1 to C3 outside the upper tank 106A, which serve as connection areas for three busbars. More specifically, a first connection area C1 for one busbar is formed above the upper tank 106A, and second and third connection areas C2 and C3 for two busbars are formed behind the upper tank 106A. The second and third connection areas C2 and C3 are arranged side by side, one above the other.

[0048] The fixed terminal connecting conductor 148A is connected to the connecting fixed terminal 138 via a branch conductor 153 provided in the middle of the vertical direction. The fixed terminal connecting conductor 148A is also supported in the middle of the vertical direction by a support body 154, which is composed of support insulators and a frame.

[0049] The fixed terminal connecting conductor 148A is connected to the first busbar connecting bushing 146A at its upper end (one end), then bends and extends downward, bending again below the upper tank 106A to form a roughly 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 disconnector with grounding switch 108 described above. Thus, the fixed terminal connecting conductor 148A forms a current path connecting the power distribution circuit of the main unit 101, which includes the disconnector with grounding switch 108, to the first busbar 143A.

[0050] The movable terminal connecting conductor 151A is formed in a generally angled shape, with one end connected to the second busbar connecting bushing 150A, extending upward, then bending so that the other end faces forward. A pivot support portion 142 is provided at the other end (front end) of the movable terminal connecting conductor 151A, and the pivot support portion 142 allows rotation of the movable terminal 137 while ensuring current flow between the movable terminal connecting conductor 151A and the movable terminal 137. The portion of the movable terminal connecting conductor 151A that extends upward in the front-rear direction is supported by a support body 156A, which is composed of support insulators and a frame.

[0051] In the disconnector with grounding switch 136, the movable terminal 137 rotates to approximately the 4 o'clock position as shown by the solid line in Figure 5, separating it from both the connecting fixed terminal 138 and the grounding fixed terminal 139. In this state, the current path connecting the distribution circuit of the main unit 101 and the first busbar 143A is disconnected from the current path by the second busbar 144A, resulting in a disconnected state.

[0052] Furthermore, when the movable terminal 137 is rotated to approximately the 2 o'clock position as indicated by the dashed line in Figure 5, the tip of the movable terminal 137 comes into contact with the connecting fixed terminal 138. In this state, the movable terminal connecting conductor 151A and the fixed terminal connecting conductor 148A are electrically connected, and the current path connecting the power distribution circuit of the main unit 101 and the first busbar 143A is electrically connected to the current path by the second busbar 144A, resulting in a connected state.

[0053] Furthermore, when the movable terminal 137 is rotated to the approximately 6 o'clock position shown by the dashed line in Figure 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 busbar 144A becomes ground potential, resulting in a grounded state.

[0054] Therefore, the disconnector with grounding switch 136 switches between the disconnected state, connected state and grounded state as described above by the rotation of the movable terminal 137, which causes the movable terminal 137 to move in and out of contact with the connection fixed terminal 138 and the grounding fixed terminal 139.

[0055] Next, the link mechanism 160 that transmits the drive of the operating mechanism 141 to the disconnect switch with grounding switch 136 will be described. Figure 8 is a schematic perspective view of the link mechanism. The link mechanism 160 comprises a first link 161, a first lever 162, a rod 163, a second lever 164, and a second link 165, which are roughly arranged from the lower left to the upper right in Figure 8. The link mechanism 160 transmits the rotational operation of the lever (not shown) of the operating mechanism 141 to the movable terminal 137, causing it to rotate. The link mechanism 160 uses a common configuration in connection units 102 of types A to C.

[0056] In the link mechanism 160, the first link 161 is formed by two bars extending in the left-right direction, and the first lever 162 is sandwiched at its right end. An operating shaft 171 is provided at the left end of the first link 161, which moves in the left-right direction by the rotational operation of the lever of the operating mechanism 141. A first pin 172 is provided at the right end of the first link 161, which 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 the shape of a right triangle when viewed from the front-to-back direction. The right-angle corner of the first lever 162 is positioned approximately directly above the first pin 172, and at this corner, the first lever 162 is rotatably supported via the first conversion shaft 173 which extends in the front-to-back direction. Thus, 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] The first lever 162 has an acute-angled corner section formed at a predetermined distance to the right of the right-angled corner section, and a first spherical bearing 175 is provided on the rear side of this acute-angled corner section. Above the first spherical bearing 175, a second spherical bearing 176 is positioned, and both ends of the rod 163, which extends in the vertical direction, are supported by the respective spherical bearings 175 and 176. The second spherical bearing 176 is provided on the second lever 164. The rod 163, with both ends supported by the respective spherical bearings 175 and 176, transmits drive operation from the first lever 162 to the second lever 164 while allowing the relative angle with respect to the first lever 162 and the second lever 164 to be arbitrarily changed.

[0059] The second lever 164 is formed by a plate that is roughly right-angled triangular in shape when viewed from the left and right directions. The second lever 164 has an acute-angled corner formed at a predetermined distance in front of the right-angled corner, and the 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 that extends in the left-right direction. Below the right-angle corner of the second lever 164, an acute-angle corner is formed at a predetermined distance, 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 rotatable relative to it. The second link 165 is formed by two bars extending in the front-rear direction, and the second lever 164 is sandwiched at its front end.

[0061] Although not shown in the diagram, the rear end of the second link 165 is connected to the movable terminal 137 of the disconnector with grounding switch 136. The movable terminal 137 rotates in accordance with the operation of the second link 165.

[0062] Next, we will explain the operation of switching the disconnector with grounding switch 136 from the disconnected state to the connected state using the link mechanism 160 as an example. Note that the operation is the same when switching from the grounded state to the disconnected state, and the operation is the same when switching from the connected state to the disconnected state, and from the disconnected state to the grounded state, with the direction of operation reversed.

[0063] When operating from a disconnected state to a connected state, the operating shaft 171 is moved in the direction of arrow S1 by a clockwise rotation operation of the lever (not shown) of the operating mechanism 141 when viewed from the 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] The rotation of the first lever 162 in the direction of arrow S2 causes the first spherical bearing 175, rod 163, and second spherical bearing 176 to move in the direction of arrow S3. During this movement, the first lever 162 and rod 163 rotate relative to each other around a central axis extending in the front-rear direction in the first spherical bearing 175, and the rod 163 and second lever 164 rotate relative to each other around a central axis extending in the left-right direction in the second spherical bearing 176.

[0065] The movement of the second spherical bearing 176 in the direction of arrow S3 causes the second lever 164 to rotate in the direction of arrow S4 around the second conversion shaft 177. This rotation causes the second pin 178 and the second link 165 to move in the direction of arrow S5, causing the movable terminal 137 connected to the second link 165 to rotate along the forward direction, and operating the disconnector with grounding switch 136 to the connected state.

[0066] Next, the B-type connection unit 102 in this embodiment will be described with reference to Figure 9. Figure 9 is a schematic cross-sectional view of the B-type connection unit. Note that for the B-type connection unit 102 and the C-type connection unit 102, which will be described later, the explanation of components common to the A-type connection unit 102 may be simplified or omitted. The gas-insulated switchgear 100 equipped with the B-type connection unit 102 is configured as a second gas-insulated switchgear.

[0067] As shown in Figure 9, the top wall 133B of the upper tank 106B (second tank) in the connecting unit 102 is provided in a crank-shaped stepped form when viewed from the left and right directions, and is formed so that the rear is higher than the front. Therefore, the upper tank 106B has an expanded internal space at the rear compared to the upper tank 106A of type A. The upper end of the side wall 134B is provided in a shape corresponding to the shape of the top wall 133B.

[0068] The first busbar 143B (busbar), which is connected to the connection unit 102, is connected to the first busbar connector 145B in the second connection region C2, which is the lower half of the rear wall 132B of the upper tank 106B. The first busbar connection bushing 146B is provided through 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 the fixed terminal connection conductor 148B inside the upper tank 106B. As a result, the first busbar 143B and the fixed terminal connection conductor 148B are energized.

[0069] As shown in Figure 9, when viewed from the left and right directions, the three-phase first bus connector 145B and the first bus connection bushing 146B are arranged in the same way as the A-type second bus connector 149A and the second bus connection bushing 150A. Therefore, the three-phase first bus connector 145B and the first bus connection bushing 146B are provided side by side in the vertical direction and arranged so as not to overlap each other in the left and right direction.

[0070] The second busbar 144B (busbar), which is connected to the connection unit 102, is connected to the second busbar connector 149B in the third connection area C3, which is the upper half of the rear wall 132B of the upper tank 106B. The second busbar connection bushing 150B is provided through 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 the movable terminal connection conductor 151B inside the upper tank 106B. As a result, the second busbar 144B and the movable terminal connection conductor 151B are energized.

[0071] As shown in Figure 9, when viewed from the left and right, the second bus connector 149B and the second bus connection bushing 150B, which correspond to the three phases, are arranged side by side in the vertical direction so as not to overlap with the first bus connector 145B and the first bus connection bushing 146B in the vertical direction. In addition, the second bus connector 149B and the second bus connection bushing 150B, which correspond to the three phases, are arranged so as not to overlap with each other in the left and right directions. In the B-type connection unit 102, the first connection area C1 is an empty area where the bus is not connected.

[0072] The fixed terminal connecting conductor 148B is connected to the connecting fixed terminal 138 via a branch conductor 153 provided at the front upper end. The fixed terminal connecting conductor 148B is also supported at the front by a support 154, which is composed of support insulators and a frame.

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

[0074] The movable terminal connecting conductor 151B is connected to the second busbar connecting bushing 150B at one end, then bends to extend forward, and bends again so that the other end is directed downward, forming a roughly crank shape. A rotating support portion 142 is provided at the other end (lower end) of the movable terminal connecting conductor 151B, and the rotation of the movable terminal 137 is allowed via the rotating support portion 142 while ensuring current flow between the movable terminal connecting conductor 151B and the movable terminal 137. The portion of the movable terminal connecting conductor 151B that extends in the front-rear direction is supported by a support body 156B, which is composed of support insulators and a frame.

[0075] The changes in the state (disconnected state, connected state, grounded state) depending on the rotation position of the movable terminal 137 are the same as those of the A-type connection unit 102, so the explanation is omitted.

[0076] Next, the C-type connection unit 102 in this embodiment will be described with reference to Figure 10. Figure 10 is a 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] As shown in Figure 10, the top wall 133C of the upper tank 106C (second tank) in the connecting unit 102 is formed in a crank shape, the same as the top wall 133B of type B. Therefore, the upper tank 106C, like the upper tank 106B of type B, has an expanded internal space 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 the first connection region C1, which is the upper region of the top wall 133C, similar to the first busbar 143A of type A. A first busbar connection bushing 146C is provided through 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 the fixed terminal connection conductor 148C inside the upper tank 106C. As a result, the first busbar 143C and the fixed terminal connection conductor 148C are energized.

[0079] As shown in Figure 10, when viewed from the left-right direction, the three-phase compatible first busbar connector 145C and first busbar connecting bushing 146C are arranged side by side in the front-to-back direction. Furthermore, the three-phase compatible first busbar connector 145C is arranged so as not to overlap with each other in the left-to-right direction, similar to the A-type first busbar connector 145A (see Figure 6).

[0080] The second busbar 144C (busbar) connected to the connection unit 102 is connected to the second busbar connector 149C in the third connection area C3, which is the upper half of the rear wall 132C of the upper tank 106C, similar to the second busbar 144B of type B. A second busbar connection bushing 150C is provided through 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 the movable terminal connection conductor 151C inside the upper tank 106C. As a result, the second busbar 144C and the movable terminal connection conductor 151C are energized.

[0081] As shown in Figure 10, when viewed from the left and right, the second busbar connector 149C and the second busbar connection bushing 150C, which correspond to the three phases, are arranged side by side in the vertical direction and are positioned so as not to overlap each other in the horizontal direction. In the C-type connection unit 102, the second connection area C2 is an empty area where the busbar is not connected.

[0082] The fixed terminal connecting conductor 148C is connected to the connecting fixed terminal 138 via a branch conductor 153 provided in the middle of the vertical direction. The fixed terminal connecting conductor 148C is also supported in the middle of the vertical direction by a support body 154, which is composed of support insulators and a frame.

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

[0084] The movable terminal connecting conductor 151C is formed in a generally angled shape, with one end connected to the second busbar connecting bushing 150C and extending downward, then bending so that the other end faces forward. A rotating support portion 142 is provided at the other end (front end) of the movable terminal connecting conductor 151C, and the rotation of the movable terminal 137 is allowed via the rotating support portion 142 while ensuring current flow between the movable terminal connecting conductor 151C and the movable terminal 137. The portion of the movable terminal connecting conductor 151C that extends in the front-rear direction is supported by a support body 156C, which is composed of support insulators and a frame.

[0085] The changes in the state (disconnected state, connected state, grounded state) depending on the rotation position of the movable terminal 137 are the same as those of the A-type connection unit 102, so the explanation is omitted.

[0086] As described above, the gas-insulated switchgear 100 of this embodiment is configured by selecting one of the A-type, B-type, or C-type connection units 102, which have a common configuration but differ overall in their configuration. This allows for the configuration of the first to third configurations (see Figures 1 to 3) described above, as shown in Figures 11 to 14. Figure 11 is a three-dimensional unit configuration diagram showing the power distribution equipment of the first configuration according to this embodiment. Figure 12 is a three-dimensional unit configuration diagram showing the power distribution equipment of the second configuration according to this embodiment. Figures 13 and 14 are three-dimensional unit configuration diagrams showing the power distribution equipment of the third configuration according to this embodiment. Note that in the unit configuration diagrams of Figures 11 to 14, some of the equipment from the first to third configurations shown in Figures 1 to 3 may be omitted.

[0087] As shown in Figure 11, the first configuration of the power receiving and distribution equipment in this embodiment can be constructed by arranging five units, each forming a single panel using the gas-insulated switchgear 100 described above, in a row. More specifically, the first configuration of the power receiving and distribution equipment in Figure 11 is arranged from left to right as follows: feeder unit U111, feeder unit U112, VCT unit U113, normal power receiving unit U114, and backup power receiving unit U115.

[0088] In the power distribution equipment shown in Figure 11, the feeder unit U112 and the regular power receiving unit U114 are connected by a gas-insulated switchgear 100 equipped with a type A connection unit 102. The feeder unit U111 and the backup power receiving unit U115 are connected by a gas-insulated switchgear 100 equipped with a type C connection unit 102. In the feeder unit U111, the feeder unit U011 and the bypass unit U015 in Figure 15 are integrated, reducing the number of panels by one compared to the conventional setup in Figure 15. Furthermore, by directly connecting the feeder unit U111 and the backup power receiving unit U115, the bypass unit U013 in Figure 15 is eliminated, reducing the number of panels by one compared to the conventional setup in Figure 15.

[0089] In this embodiment, the number of surfaces for the power receiving and distribution equipment in the first configuration, which conventionally had 7 surfaces (see Figure 15), can be reduced to 5 surfaces.

[0090] As shown in Figure 12, the second configuration of the power receiving and distribution equipment in this embodiment can be configured by arranging eight units, each forming a single panel using the gas-insulated switchgear 100 described above, in a row. More specifically, the second configuration of the power receiving and distribution equipment in Figure 12 is arranged from left to right as follows: a backup 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 distribution equipment shown in Figure 12, feeder units U124 and U125 are composed of a gas-insulated switchgear 100 equipped with a type A connection unit 102. In feeder unit U124, feeder unit U024 and busbar connection unit U025 in Figure 16 are integrated, reducing the number of panels by one compared to the conventional design in Figure 16. Similarly, in feeder unit U125, busbar connection unit U026 and feeder unit U027 in Figure 16 are integrated, reducing the number of panels by one compared to the conventional design in Figure 16.

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

[0093] The third configuration of the power distribution equipment in this embodiment can be configured by arranging six units, each comprising a single panel using the gas-insulated switchgear 100 described above, in a row, as shown in Figure 13, and by arranging eight units, each comprising a single panel using the gas-insulated switchgear 100 described above, in a row, as shown in Figure 14. The power distribution equipment in Figure 13 is configured under conditions that do not consider the separate replacement of the primary and backup systems, and can be configured without external cables by arranging the power receiving panels and feeders in a row. The power distribution equipment in Figure 14 is configured under conditions that consider the separate replacement of the primary and backup systems, and the busbars between the feeders need to be configured with external cables.

[0094] The third configuration of the power receiving and distribution equipment in Figure 13 has the following arrangement from left to right: EVT / LA unit U131, feeder unit U132, feeder unit U133, EVT / LA unit U134, bypass DS unit U135, VCT unit U136, regular power receiving unit U137, and backup power receiving unit U138.

[0095] In the power receiving and distribution equipment shown in Figure 13, the regular power receiving unit U137 and the feeder unit U133 are configured with a gas-insulated switchgear 100 equipped with a C-type connection unit 102. The feeder unit U132 and the backup power receiving unit U138 are configured with a gas-insulated switchgear 100 equipped with a B-type connection unit 102.

[0096] In the power distribution equipment shown in Figure 13, the number of surfaces for the third configuration of power distribution equipment, which conventionally had 12 surfaces (see Figure 17), can be reduced to 8 surfaces.

[0097] The third configuration of the power receiving and distribution equipment in Figure 14 has the following arrangement from left to right: EVT / LA unit U141, feeder unit U142, bypass DS unit U143, backup power receiving unit U144, regular power receiving unit U145, VCT unit U146, feeder unit U147, and EVT / LA unit U148.

[0098] In the power receiving and distribution equipment shown in Figure 14, the feeder unit U142 and the backup power receiving unit U144 are configured with a 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 with a gas-insulated switchgear 100 equipped with a type C connection unit 102.

[0099] In the feeder unit U142, the busbar connection unit U03A and feeder unit U03B in Figure 17 are integrated, reducing the number of panels by one compared to the conventional design in Figure 17. In the auxiliary power receiving unit U144, the auxiliary power receiving unit U032 and busbar connection unit U033 in Figure 17 are integrated, reducing the number of panels by one compared to the conventional design in Figure 17. In the regular power receiving unit U145, the regular power receiving unit U035 and busbar connection unit U034 in Figure 17 are integrated, reducing the number of panels by one compared to the conventional design in Figure 17. In the feeder unit U147, the feeder unit U038 and busbar connection unit U039 in Figure 17 are integrated, reducing the number of panels by one compared to the conventional design in Figure 17.

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

[0101] One reason why the number of surfaces can be reduced as described above in this embodiment is that the gas-insulated switchgear 100 allows selection of connection units 102 from three types: A, B, and C. This increases the flexibility of the layout of the first busbars 143A, 143B, 143C and the second busbars 144A, 144B, 144C, allowing for the configuration of the power distribution equipment. Since the gas-insulated switchgear 100 that constitutes such power distribution equipment has the main unit 101 and connection units 102 arranged vertically, the number of surfaces in the row number arrangement can be reduced compared to conventional designs. This reduces the installation area of ​​the power distribution equipment.

[0102] Furthermore, a first connection area C1 for one circuit is formed above the upper tank 106, and second and third connection areas C2 and C3 for two circuits are formed behind the upper tank 106. This allows for the effective use of two different areas above and behind the upper tank 106 to arrange each busbar 143A, 143B, 143C, 144A, 144B, and 144C, thereby increasing the flexibility of the busbar layout.

[0103] Furthermore, in the A-type connection unit 102, the first busbar 143A is connected in the second connection area C2, leaving the third connection area C3 empty without a busbar connected to it. In the C-type connection unit 102, the second busbar 144C is connected in the third connection area C3, leaving the second connection area C2 empty without a busbar connected to it. This allows busbars connected to other gas-insulated switchgear 100 to pass through the empty second connection area C2 or third connection area C3, further increasing the flexibility of the busbar layout.

[0104] Furthermore, the three types of connection units 102 (Type A, Type B, and Type C) share common parts, including the disconnector with grounding switch 136, the link mechanism 160, and some parts of the upper tanks 106A, 106B, and 106C. This reduces the number of parts and assembly time, thereby simplifying the configuration.

[0105] It should be noted that the present invention is not limited to the embodiments described above, and can be implemented with various modifications. In the embodiments described above, the size, shape, orientation, etc., shown in the accompanying drawings are not limited thereto, and can be appropriately modified within the scope that allows the present invention to exert its effects. Furthermore, it can be implemented with appropriate modifications as long as it does not deviate from the scope of the objectives of the present invention.

[0106] In the above embodiment, the first to third connection regions C1 to C3 were formed outside the upper tank 106 as connection regions for three busbars. However, it is also possible to form connection regions for four or more busbars by further forming such connection regions above the upper tank 106.

[0107] Furthermore, the first to third configurations of the power distribution equipment described above are illustrative examples, and the gas-insulated switchgear 100 of this embodiment may be used in power distribution equipment with other configurations. In the power distribution equipment of the present invention, it is sufficient to have at least one gas-insulated switchgear 100 equipped with one of the connection units 102 of type A, type B, or type C.

[0108] Furthermore, in the disconnectors with grounding switches 108, 112, and 136, the grounding switch and the disconnector may be configured separately. Also, the disconnector with grounding 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 in other positions. [Explanation of symbols]

[0109] 100: Gas-insulated switchgear 101: Main Unit 102: Connection Unit 105: Lower tank (Tank 1) 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) 141: Operating mechanism 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) 160: Rinku Organization 161:1st Riko 162: No. 1 レバー 163 :ロッド 164: No. 2 レバー 165: 2nd Riko 175: The first spherical axis is subjected to 176: The second spherical axis is subjected to 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 equipment arranged inside the first tank for opening and closing power distribution circuits, A gas-insulated switchgear comprising a second tank filled with insulating gas, and a connection unit having a disconnector disposed inside the second tank for switching between disconnected and connected states between the power distribution circuit and the busbar, The main unit and the connecting unit are arranged vertically and integrated together. The disconnector comprises a rotatable movable terminal and a fixed terminal that moves toward and toward the movable terminal by the rotation of the movable terminal, and switches between the disconnected state and the connected state by moving toward and toward the movable terminal. The connection unit is provided outside the second tank with connection areas for at least three busbars, and includes an operating mechanism provided on the front side of the connection unit for operating the rotation of the movable terminal, and a link mechanism that transmits the rotation operation of the operating mechanism to the movable terminal and rotates the movable terminal along the front-rear direction. The link mechanism includes a first link that moves in the left-right direction by the rotational operation of the operating mechanism, A first lever formed by a plate that rotates due to the left-right movement of the first link, Rod and, A second lever is formed by a plate that rotates when the rotation of the first lever is transmitted via the rod, The device comprises a second link that moves in the front-rear direction by the rotation of the second lever, thereby rotating the movable terminal, A gas-insulated switchgear characterized in that the rod is provided so that the relative angle between the first lever and the second lever can be arbitrarily changed, and the relative rotation around a central axis extending in the front-rear direction with respect to the first lever is transmitted as relative rotation around a central axis extending in the left-right direction with respect to the second lever.

2. The first lever is provided with a first spherical bearing. The second lever is provided with a second spherical bearing. The gas-insulated switchgear according to claim 1, characterized in that one end of the rod is supported by the first spherical bearing and the other end is supported by the second spherical bearing.

3. The gas-insulated switchgear according to claim 1 or 2, characterized in that the movable terminals are arranged in the central regions of the second tank in both the vertical and front-to-back directions.

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