Gas-insulated switchgear

Abstract

The power transmission line includes a three-phase first main circuit conductor (50) consisting of a first conductor (51), a second conductor (52), and a third conductor (53) arranged parallel to one another along the XY plane, and a second main circuit conductor (60) consisting of a fourth conductor (61), a fifth conductor (62), and a sixth conductor (63) connected to the first conductor (51), the second conductor (52), and the third conductor (53) of the first main circuit conductor (50) by a first connection bolt (191), a second connection bolt (192), and a third connection bolt (193), respectively, and extending toward one side (Z1) of the Z axis perpendicular to the XY plane, wherein an acute angle rises from at least one conductor of the first main circuit conductor (50) toward one conductor of the second main circuit conductor (60) connected to said conductor from the XY plane toward one side of the Z axis.

Description

[Technical Field]

[0001] The present disclosure relates to gas-insulated switchgear. [Background technology]

[0002] Gas-insulated switchgear is a switchgear in which the main circuit to which high voltage is applied, such as a circuit breaker or disconnecting switch, is housed in a pressure vessel filled with an insulating medium such as a highly insulating gas (for example, sulfur hexafluoride (SF6)).The gas-insulated switchgear supports the gas switchgear equipment or main circuit conductors with insulators so that they can withstand the electromagnetic force that acts when a large current generated by the rated current during operation, a lightning strike, or an electrical system accident flows through the main circuit.

[0003] When the rated current of the device is flowing or a fault current flows in the three-phase main circuit conductors arranged in the gas-insulated switchgear, an electromagnetic force acts between the three-phase main circuit conductors. At the bent portions of the main circuit conductors, electromagnetic forces act between the bent conductors, and the conductors must be able to withstand these forces. In conventional technology, the angle is changed by 90° at the bend, and the two conductors before and after the bend are connected with bolts or other means to form parallel main circuits, and the conductors are generally fixed in place with bolts via insulators. For example, there is a structure in which mounted devices such as circuit breakers and disconnecting switches arranged in a vertical direction are connected by a linear main circuit conductor (Patent Document 1). There is also an example in which mounted devices such as disconnector modules and circuit breaker modules arranged horizontally are connected by a straight main circuit conductor (Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6837607 [Patent Document 2] Patent No. 7566213 Summary of the Invention [Problem to be solved by the invention]

[0005] In the above-described conventional structure, the longer the main circuit conductor, the greater the electromagnetic force acting on the conductor, so it is necessary to add more connection points connecting the main circuit conductors or increase the number of connection bolts, which poses the problem of increasing component costs and work time.

[0006] The present disclosure discloses a technology for solving the above-mentioned problems, and aims to provide a gas-insulated switchgear that can reduce the number of connection points connecting main circuit conductors and the number of connection bolts. [Means for solving the problem]

[0007] The gas insulated switchgear of the present disclosure comprises: Inside a pressure vessel filled with insulating gas, a three-phase first main circuit conductor consisting of a first conductor, a second conductor, and a third conductor arranged parallel to one another along an XY plane; a second main circuit conductor consisting of a fourth conductor, a fifth conductor, and a sixth conductor connected to the first conductor, the second conductor, and the third conductor of the first main circuit conductor by a first connection bolt, a second connection bolt, and a third connection bolt, respectively, and extending toward one side of a Z-axis perpendicular to the XY plane; 、 The first main circuit conductor has the second conductor at the center, and the first conductor and the third conductor disposed on either side of the second conductor, When the axis of the first conductor is defined as the first axis, the axis of the second conductor is defined as the second axis, the axis of the third conductor is defined as the third axis, the axis of the long side of the fourth conductor is defined as the fourth axis, the axis of the long side of the fifth conductor is defined as the fifth axis, and the axis of the long side of the sixth conductor is defined as the sixth axis, A first angle rising from the first axis line toward the fourth axis line from the XY plane to one side of the Z axis is an acute angle, and a third angle rising from the third axis line toward the sixth axis line from the XY plane to one side of the Z axis is an acute angle. [Effects of the Invention]

[0008] According to the gas-insulated switchgear of the present disclosure, it is possible to reduce the number of connection points for connecting main circuit conductors and the number of connection bolts. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a front view showing the overall structure of a gas-insulated switchgear according to a first embodiment. [Figure 2] 1 is a perspective schematic diagram showing the configuration of a disconnector module according to a first embodiment. [Figure 3] 1 is a perspective schematic diagram showing the configuration of a disconnector module according to a first embodiment. [Figure 4] 1 is a top perspective view of a gas-insulated switchgear according to a first embodiment. [Figure 5] 5 is a perspective schematic view of the circuit breaker module according to the first embodiment as seen in the direction of arrow B in FIG. 4. [Figure 6] 1 is a perspective view showing a connection structure of a main circuit conductor of a gas-insulated switchgear according to a first embodiment. [Figure 7] 7 is a front view showing the connection structure of the main circuit conductors of the gas-insulated switchgear according to the first embodiment, as viewed from the P1 direction in FIG. 6. FIG. [Figure 8] 8 is a cross-sectional view taken along the dashed dotted line A1-A1 shown in FIG. 7 and seen from the other side Z2 to one side Z1 of the Z axis. [Figure 9] 7 is a side view showing the connection structure of the main circuit conductors of the gas-insulated switchgear according to the first embodiment, as viewed from the P2 direction in FIG. 6. FIG. [Figure 10] 9 is a perspective view showing a connection structure of a main circuit conductor of the gas-insulated switchgear according to the first embodiment, as viewed from the arrow B1 shown in FIG. 8. [Figure 11] 9 is a cross-sectional view showing the connection structure of the main circuit conductors of the gas-insulated switchgear according to the first embodiment, taken along the dashed dotted line C1-C1 shown in FIG. 8. FIG. [Figure 12] FIG. 9 is a diagram that schematically illustrates FIG. 8, showing the flow of current and electromagnetic force. DETAILED DESCRIPTION OF THE INVENTION

[0010] Embodiment 1 A gas-insulated switchgear according to a first embodiment will be described below with reference to the drawings.

[0011] [Overall structure of gas-insulated switchgear] First, the overall structure of a gas-insulated switchgear according to a first embodiment will be described with reference to FIGS. In each drawing, the same reference numerals indicate the same or corresponding parts. FIG. 1 is a front view showing the overall structure of a gas-insulated switchgear 100 according to a first embodiment. Fig. 2 is a schematic perspective view showing the configuration of the disconnector module 10. Fig. 2 is a schematic perspective view of the disconnector module 10 of Fig. 1 as seen in the direction of arrow A. Fig. 2 also shows a state in which the main circuit is closed. Fig. 3 is a schematic perspective view showing the configuration of the disconnector module 10. Fig. 3 is a schematic perspective view of the disconnector module 10 in Fig. 1 as seen in the direction of arrow A. Fig. 3 also shows a state in which the main circuit is open. FIG. 4 is a top perspective view of the gas-insulated switchgear 100. As shown in FIG. FIG. 5 is a perspective schematic view of the circuit breaker module according to the first embodiment as viewed in the direction of arrow B in FIG.

[0012] As shown in FIG. 1, the gas-insulated switchgear 100 comprises three disconnector modules 10 (10A, 10B, 10C) and one circuit breaker module 30. Hereinafter, when identifying the three disconnector modules 10 individually, they will be referred to as disconnector modules 10A, 10B, and 10C. The disconnector modules 10A, 10B, and 10C have the same configuration. However, although the configuration of the disconnector modules 10A, 10B, and 10C is the same, the power supply is connected to the disconnector module 10C, and therefore the direction of electrical energy flowing through the disconnector module 10C is opposite to that of the disconnector modules 10A and 10B. Furthermore, components with A appended to their reference numerals refer to components of the disconnector module 10A. Similarly, components with B appended to their reference numerals refer to components of the disconnector module 10B, and components with C appended to their reference numerals refer to components of the disconnector module 10C.

[0013] Each disconnector module 10 is composed of a pressure vessel 11 and one disconnector 20 housed inside the pressure vessel 11. The disconnector modules 10A, 10B, and 10C and the circuit breaker module 30 are connected in series.

[0014] Pressure vessels 11A, 11B, and 11C (first pressure vessels) are arranged so that their respective central axes PA, PB, and PC are parallel and horizontal to one another, and have an opening 11K (first opening) shown in FIG. 2 at one end in the direction of the central axes PA, PB, and PC (the front side, near the plane of FIG. 1). As described above, one disconnector 20A, 20B, and 20C is installed inside each of pressure vessels 11A, 11B, and 11C. Note that, although an example has been shown in which the respective central axes PA, PB, and PC of pressure vessels 11A, 11B, and 11C are horizontal to one another, they do not necessarily have to be horizontal.

[0015] Pressure vessel 11D (second pressure vessel) is disposed so that its central axis PD is vertical, and has openings 11DK (third openings) at its upper and lower ends. That is, pressure vessel 11D is disposed so that its central axis PD is perpendicular to the central axes PA, PB, and PC of pressure vessels 11A, 11B, and 11C, respectively. Note that, although an example has been shown in which pressure vessel 11D's central axis PD is perpendicular to the central axes PA, PB, and PC of pressure vessels 11A, 11B, and 10C, respectively, it does not necessarily have to be perpendicular.

[0016] One circuit breaker 40 is installed inside the pressure vessel 11D. The circuit breaker 40 interrupts the large current flowing through the main circuit in the direction of the central axis PD of the pressure vessel 11D. Note that the pressure vessel 11D may have only one opening. The opening 11DK is closed by a lid 82.

[0017] As shown in Figure 2, the pressure vessel 11 has a curved wall 11L at the end opposite the opening 11K in the direction of the central axis P. The lid 8 is attached to the opening 11K via an O-ring R1. The O-ring R1 is housed in a groove M formed along the outer edge of the lid 8. Therefore, the interior of the pressure vessel 11 is kept airtight from the outside.

[0018] The disconnector 20 includes a disconnector operating mechanism 9, a drive shaft 91, a cable-side conductor 12, a conductor blade 14, a bus-side conductor 13, a bushing 16, an input / output conductor 18, and an insulating support portion 15.

[0019] A disconnector operating mechanism 9 for opening and closing the disconnector 20 is fastened to the surface of the lid 8 that faces the outside of the pressure vessel 11, and the disconnector operating mechanism 9 provided outside the pressure vessel 11 and a conductor blade 14 serving as an ON-OFF drive unit for the main circuit of the disconnector 20 inside the pressure vessel 11 are connected by a drive shaft 91 that penetrates the lid 8. Note that airtightness is maintained between the drive shaft 91 and the lid 8 at the lid penetration part 81.

[0020] The surface of the lid 8 facing the inside of the pressure vessel 11 supports, via insulating support parts 15, the cable side conductor 12 of the disconnector 20, the bus side conductor 13 of the disconnector, and a conductor blade 14 that connects the main circuits by the disconnector operating mechanism 9.

[0021] 2 and 3, a bushing 16 for connecting the cable terminal 4 is attached to the bottom of the lid 8 with airtightness maintained by an O-ring R2, and the bushing 16 is connected to the cable-side conductor 12 via an input / output conductor 18. The cable terminal 4 is connected to the outer portion of the bushing 16 outside the pressure vessel 11. Although only one each of the cable-side conductor 12, bus-side conductor 13, drive shaft 91, conductor blade 14, bushing 16, and input / output conductor 18 is shown in FIGS. 2 and 3, three sets, i.e., three phases, are arranged from the front to the back of the paper in FIGS. 2 and 3, and one disconnector operating mechanism 9 drives three drive shafts 91 to disconnect (open / close) the main circuits for three phases in the direction of the central axis P of the pressure vessel 11.

[0022] 2 and 3, when the pressure vessel 11 is viewed from the side of arrow A in Fig. 1, three insulators 130 (131, 132, 133) are lined up in the direction of the central axis P (PA) at the bottom of the pressure vessel 11 on the side of the rear wall 11L, toward the rear wall 11L of the pressure vessel 11. In reality, the three insulators 130 (131, 132, 133) are arranged side by side, each shifted horizontally.

[0023] The three first main circuit conductors 50 (51, 52, 53) are supported from below by insulators 130 (131, 132, 133), and are arranged side by side vertically and horizontally in the direction of the central axis of the pressure vessel 11. That is, the three first main circuit conductors 50 extend horizontally from the front of the paper to the back of the paper in FIG. 2, and are arranged parallel to one another as shown in FIG. 4. As shown in FIGS. 2 and 3, the three first main circuit conductors 50 are connected to the three bus-side conductors 13 by three second main circuit conductors 60 (61, 62, 63) and three third main circuit conductors 70 (71, 72, 73). The three second main circuit conductors 60 and the three third main circuit conductors 70 are connected by three angle-changing conductors 170 (171, 172, 173).

[0024] As shown in Figure 4, fastening flange portions 11F (11AF, 11BF, 11CF, 11DF) having flange openings 11K2 (11AK2, 11BK2, 11CK2, 11DK2) are provided on both side surfaces of the pressure vessel 11. A lid 82 is fastened to one flange portion 11AF of the pressure vessel 11A, closing the pressure vessel 11 while ensuring airtightness inside the pressure vessel 11. The other flange portion 11AF is fastened with a bolt to one flange portion 11BF of the adjacent pressure vessel 11B, joining the disconnector modules 10A and 10B together.

[0025] FIG. 5 is a perspective schematic view of the circuit breaker module 30 as viewed in the direction of arrow B in FIG. As shown in Fig. 5, fastening flange portions 11DF having flange openings 11DK2 are provided on both side surfaces of the pressure vessel 11D of the circuit breaker module 30. One of the flange portions 11DF is fastened with a bolt to the other flange portion 11BF having a flange opening 11BK2 of the adjacent pressure vessel 11B, as shown in Fig. 1, thereby connecting the disconnector module 10B and the circuit breaker module 30 to each other. Note that although the operating unit 32 of the circuit breaker module 30 is provided at the top in Fig. 1, it may also be provided at the bottom.

[0026] 1, the other flange portion 11DF is fastened with bolts to a flange portion 11CF having one flange opening 11CK2 of the adjacent pressure vessel 11C, connecting the disconnector module 10B and the circuit breaker module 30. A lid 82 is fastened to the flange portion 11CF having the other flange opening 11CK2 of the pressure vessel 11C, closing the pressure vessel 11 while ensuring airtightness inside the pressure vessel 11. Note that for the pressure vessel 11D, the positions of the two flange portions 11DF are offset in the direction of the central axis PD due to the arrangement of the circuit breaker 40.

[0027] In this way, the gas-insulated switchgear 100 has a structure in which any number of disconnector modules 10 and circuit breaker modules 30 can be selected and connected in series. The reason for arranging the circuit breaker modules vertically to the ground is to make efficient use of installation space. The actual length of the circuit breaker modules 30 is longer than that of the disconnector modules 10. Therefore, the circuit breaker modules 30 are erected to reduce the overall installation space.

[0028] As shown in Fig. 5, one busbar connecting conductor 31 is connected to the first main circuit conductor 50 which passes through the flange opening 11DK2 of the pressure vessel 11D and the flange opening 11BK2 of the pressure vessel 11B and penetrates the disconnector module 10B and the disconnector module 10A. The other busbar connecting conductor 31 is connected to the first main circuit conductor 50 of the disconnector module 10C through the flange opening 11DK2 of the pressure vessel 11D. In Fig. 5, each of the left and right busbar connecting conductors 31 appears to be a single busbar connecting conductor, but in reality, three busbar connecting conductors 31 are lined up toward the back of the page.

[0029] [Main circuit conductor connection structure] Next, a connection structure of the main circuit conductors of the gas-insulated switchgear according to the first embodiment will be described with reference to the drawings. FIG. 6 is a perspective view showing a connection structure of a main circuit conductor of the gas-insulated switchgear according to the first embodiment. FIG. 7 is a front view showing the connection structure of the main circuit conductors of the gas-insulated switchgear according to the first embodiment, as viewed from the P1 direction in FIG. 8 is a cross-sectional view taken along the dashed dotted line A1-A1 shown in FIG. 7 and viewed from the other side Z2 to one side Z1 of the Z axis. FIG. 9 is a side view showing the connection structure of the main circuit conductors of the gas-insulated switchgear according to the first embodiment, as viewed from the P2 direction in FIG. FIG. 10 is a perspective view showing the connection structure of the main circuit conductors of the gas-insulated switchgear according to the first embodiment, as viewed from the arrow B1 shown in FIG. FIG. 11 is a cross-sectional view showing the connection structure of the main circuit conductors of the gas-insulated switchgear according to the first embodiment, taken along the dashed dotted line C1-C1 shown in FIG.

[0030] 6 to 11, the plane on which the first conductor 51, second conductor 52, and third conductor 53 constituting the first main circuit conductor 50 are arranged in parallel is defined as the XY plane. The XY plane includes the X axis and the Y axis, which are perpendicular to each other, and the axis perpendicular to the XY plane is defined as the Z axis. Furthermore, one side of the X axis is defined as X1 and the other side as X2, one side of the Y axis is defined as Y1 and the other side as Y2, and one side of the Z axis is defined as Z1 and the other side as Z2. In the figure, the first conductor 51, the second conductor 52, and the third conductor 53 constituting the first main circuit conductor 50 are shown as being arranged parallel to the XY plane, but they may be slightly misaligned as long as they are substantially parallel along the XY plane. The first main circuit conductor 50 has a second conductor 52 at the center, and a first conductor 51 and a third conductor disposed on either side of the second conductor 52.

[0031] The first conductor 51, second conductor 52 and third conductor 53 constituting the first main circuit conductor 50 are fixed to the first insulator 131, second insulator 132 and third insulator 133 attached to the frame 140 of the pressure vessel 11 by the first fastening bolt 181, second fastening bolt 182 and third fastening bolt 183. As described above, the first conductor 51, the second conductor 52, and the third conductor 53 that constitute the first main circuit conductor 50 are arranged parallel to one another along the XY plane. A first electric field relaxation conductor 161, a second electric field relaxation conductor 162 and a third electric field relaxation conductor 163 are attached to the tips of the first conductor 51, the second conductor 52 and the third conductor 53 to relax the electric field with the pressure vessel 11.

[0032] The first conductor 51, second conductor 52 and third conductor 53 of the first main circuit conductor 50 are connected to the fourth conductor 61, fifth conductor 62 and sixth conductor 63 that constitute the second main circuit conductor 60 extending toward one side Z1 of the Z axis perpendicular to the XY plane by the first connection bolt 191, second connection bolt 192 and third connection bolt 193, respectively.

[0033] Here, the axis of the first conductor 51 is the first axis L1, the axis of the second conductor 52 is the second axis L2, the axis of the third conductor 53 is the third axis L3, the axis of the long side portion of the fourth conductor 61 is the fourth axis L4, the axis of the long side portion of the fifth conductor 62 is the fifth axis L5, and the axis of the long side portion of the sixth conductor is the sixth axis L6.

[0034] 7, 10, and 11, a first angle θ1 extending from the first axis L1 to the fourth axis L4 toward one side Z1 of the Z axis from the XY plane is an acute angle. Also, a third angle θ3 extending from the third axis L3 to the sixth axis L6 toward one side Z1 of the Z axis from the XY plane is an acute angle.

[0035] In this embodiment, the second angle θ2 rising from the second axis L2 toward the fifth axis L5 from the XY plane to one side Z1 of the Z axis is substantially 90°, as shown in Fig. 11. However, the second angle θ2 may be an angle other than 90°.

[0036] As shown in Figures 7, 10, and 11, when the second axis L2 is defined as the X-axis, the fourth conductor 61 rises from the first conductor 51 toward one side X1 of the X-axis, and the sixth conductor 63 rises from the third conductor 53 toward the other side X2 of the X-axis.

[0037] In this embodiment, the first acute angle θ1 and the third acute angle θ3 are the same angle, but the first acute angle θ1 and the third acute angle θ3 may be different angles.

[0038] As shown in FIG. 8, the fourth conductor 61 rises from the first conductor 51 toward the second conductor 52, and the sixth conductor 63 rises from the third conductor 53 toward the second conductor 52. The fourth angle θ4, which is the angle between the projection lines of the first axis L1 and the fourth axis L4 when projected onto the XY plane, is defined as an acute angle, and the sixth angle θ6, which is the angle between the projection lines of the third axis L3 and the sixth axis L6 when projected onto the XY plane, is defined as an acute angle. In this embodiment, the fifth angle θ5, which is the angle between the second axis L2 and the fifth axis L5, is a right angle.

[0039] In this embodiment, the fourth angle θ4 and the sixth angle θ6, which are acute angles, are the same angle, although the fourth angle θ4 and the sixth angle θ6, which are acute angles, may be different angles.

[0040] The fourth conductor 61, fifth conductor 62, and sixth conductor 63 constituting the second main circuit conductor 60 are connected to the seventh conductor 71, eighth conductor 72, and ninth conductor 73 constituting the third main circuit conductor 70 via the first angle conversion conductor 171, the second angle conversion conductor 172, and the third angle conversion conductor 173, respectively.

[0041] In the present embodiment, the seventh conductor 71, the eighth conductor 72, and the ninth conductor 73 that constitute the third main circuit conductor 70 are arranged parallel to one another along the XY plane. However, the seventh conductor 71, the eighth conductor 72, and the ninth conductor 73 do not have to be arranged parallel to one another along the XY plane.

[0042] The first conductor 51, second conductor 52 and third conductor 53 constituting the first main circuit conductor 50 are fastened to the first insulator 131, second insulator 132 and third insulator 133 fixed to the pressure vessel 11 by the first fastening bolt 181, second fastening bolt 182 and third fastening bolt 183, respectively.

[0043] As described above, in this embodiment, the first conductor 51, second conductor 52, and third conductor 53 constituting the first main circuit conductor 50 are connected to the fourth conductor 61, fifth conductor 62, and sixth conductor 63 constituting the second main circuit conductor 60 by the first connection bolt 191, second connection bolt 192, and third connection bolt 193, respectively, at the first angle θ1, second angle θ2, third angle θ3, fourth angle θ4, fifth angle θ5, and sixth angle θ6, and are arranged three-dimensionally toward one side Z1 of the Z axis perpendicular to the XY plane while avoiding interference.

[0044] In Figure 6, the fifth conductor 62 is a straight conductor arranged vertically at an angle of 90° toward one side Z1 of the Z axis, but like the fourth conductor 61 and the sixth conductor 63, it can also be bent at an angle other than 90°. Furthermore, the angles formed between the fourth conductor 61, the fifth conductor 62 and the sixth conductor 63 can be different for each phase, and countless combinations of angles different for each phase are possible.

[0045] [Effect of the connection structure of the main circuit conductor] The first conductor 51, second conductor 52, and third conductor 53 that make up the first main circuit conductor 50, and the fourth conductor 61, fifth conductor 62, and sixth conductor 63 that make up the second main circuit conductor 60 are electrically conducting, and electromagnetic forces act on each other. For example, when current is passed from the first conductor 51 to the fourth conductor 61, an electromagnetic force F4 acts on the fourth conductor 61 in the direction shown in FIG. 10 (a direction parallel to the XY plane). When the fourth conductor 61 has a first angle θ1 which is an acute angle, the electromagnetic force F4 acting on the fourth conductor 61 is divided into the vectors of electromagnetic force F4a=F4·sinθ1 and electromagnetic force F4b=F4·cosθ1. The moment that reduces the axial force of the first connection bolt 191 that connects the first conductor 51 and the fourth conductor 61 is determined by the electromagnetic force F4a=F4·sin θ1 if the length of the fourth conductor 61 is constant. In contrast, if the fourth conductor 61 rises at an angle of 90° from the first conductor 51, when current is passed from the first conductor 51 to the fourth conductor 61, the moment that reduces the axial force of the first connecting bolt 191 is the product of the electromagnetic force F4 and the length of the fourth conductor 61. In other words, in the structure of this embodiment, the moment that reduces the axial force of the first connection bolt 191 becomes smaller as the first angle θ1 approaches 0°, so that it is possible to suppress a decrease in the axial force of the first connection bolt 191 and a decrease in the current-carrying area due to misalignment of the contact surfaces between the first conductor 51 and the fourth conductor 61. The same effects and advantages as those described above can be obtained even when current is passed from the third conductor 53 to the sixth conductor 63.

[0046] FIG. 12 is a diagram that schematically illustrates FIG. 8, and shows the flow of current and electromagnetic force. As shown in FIG. 12, the fourth conductor 61 rises from the first conductor 51 toward the second conductor 52, and the sixth conductor 63 rises from the third conductor 53 toward the second conductor 52, so that the fourth angle θ4, which is the angle between the projection lines of the first axis L1 and the fourth axis L4 when projected onto the XY plane, is an acute angle, and the sixth angle θ6, which is the angle between the projection lines of the third axis L3 and the sixth axis L6 when projected onto the XY plane, is also an acute angle. In FIG. 12, consider a case where a current I11 flows from the first conductor 51 to the fourth conductor 61 in the direction of the arrow, and a current I31 flows from the third conductor 53 to the sixth conductor 63 in the direction of the arrow. At this time, an attractive force F13 acts between the first conductor 51 and the third conductor 53, and a repulsive force F46 acts between the fourth conductor 61 and the sixth conductor 63. As a result, the attractive force F13 and the repulsive force F46 cancel each other out, reducing the force acting on the first connecting bolt 191 connecting the first conductor 51 and the fourth conductor 61, and the third connecting bolt 193 connecting the third conductor 53 and the sixth conductor 63, thereby preventing a decrease in the axial force at the bolt connection point and a decrease in the current-carrying area due to misalignment of the contact surfaces between the conductors.

[0047] [Effects of the First Embodiment] As described above, according to the first embodiment, Inside a pressure vessel filled with insulating gas, a three-phase first main circuit conductor consisting of a first conductor, a second conductor, and a third conductor arranged parallel to one another along an XY plane; a second main circuit conductor consisting of fourth conductors, fifth conductors, and sixth conductors connected to the first conductor, the second conductor, and the third conductor of the first main circuit conductor by first connection bolts, second connection bolts, and third connection bolts, respectively, and extending toward one side of a Z-axis perpendicular to the XY plane; At least one conductor of the first main circuit conductor is arranged to rise from the XY plane to one conductor of the second main circuit conductor connected to the first conductor at an acute angle on one side of the Z axis. This makes it possible to reduce the number of connection points for connecting the main circuit conductors and the number of connection bolts.

[0048] In addition, the first main circuit conductor has the second conductor at the center, and the first conductor and the third conductor are arranged on both sides of the second conductor, When the axis of the first conductor is defined as the first axis, the axis of the second conductor is defined as the second axis, the axis of the third conductor is defined as the third axis, the axis of the long side of the fourth conductor is defined as the fourth axis, the axis of the long side of the fifth conductor is defined as the fifth axis, and the axis of the long side of the sixth conductor is defined as the sixth axis, A first angle rising from the first axis line toward the fourth axis line from the XY plane to one side of the Z axis is an acute angle, and a third angle rising from the third axis line toward the sixth axis line from the XY plane to one side of the Z axis is an acute angle, This makes it possible to reduce the number of connection points connecting the first main circuit conductor and the second main circuit conductor, and to reduce the number of connection bolts.

[0049] Furthermore, a second angle rising from the XY plane to one side of the Z axis toward the fifth axis is a right angle. The second main circuit conductor can be arranged three-dimensionally from the first main circuit conductor toward one side Z1 of the Z axis perpendicular to the XY plane while avoiding interference.

[0050] Furthermore, when the second axis is defined as the X-axis, the fourth conductor rises from the first conductor toward one side of the X-axis, and the sixth conductor rises from the third conductor toward the other side of the X-axis. The second main circuit conductors can be arranged in a well-balanced manner and three-dimensionally from the first main circuit conductors toward one side Z1 of the Z axis perpendicular to the XY plane while avoiding interference.

[0051] Furthermore, since the first angle and the third angle are made equal, The second main circuit conductors can be arranged in a well-balanced manner and three-dimensionally from the first main circuit conductors toward one side Z1 of the Z axis perpendicular to the XY plane while avoiding interference.

[0052] The fourth conductor rises from the first conductor toward the second conductor at an incline, and the sixth conductor rises from the third conductor toward the second conductor at an incline, a fourth angle, which is an angle between a projection line when the first axis line and the fourth axis line are projected onto an XY plane, is an acute angle; The sixth angle, which is the angle between the projection lines when the third axis and the sixth axis are projected onto the XY plane, is an acute angle. This makes it possible to reduce the number of connection points connecting the first main circuit conductor and the second main circuit conductor and the number of connection bolts, and also allows the second main circuit conductor to be arranged in a balanced, three-dimensional manner from the first main circuit conductor toward one side Z1 of the Z axis perpendicular to the XY plane, while avoiding interference.

[0053] Furthermore, since the fourth angle and the sixth angle are made equal, the second main circuit conductor can be arranged in a balanced and three-dimensional manner from the first main circuit conductor toward one side Z1 of the Z axis perpendicular to the XY plane, while avoiding interference.

[0054] Furthermore, the fourth conductor, the fifth conductor, and the sixth conductor that constitute the second main circuit conductor are connected to the seventh conductor, the eighth conductor, and the ninth conductor that constitute the third main circuit conductor, respectively. The second main circuit conductor can be connected to the third main circuit conductor in a well-balanced manner.

[0055] Furthermore, the seventh conductor, the eighth conductor, and the ninth conductor that constitute the third main circuit conductor are arranged parallel to one another along the XY plane. The third main circuit conductor can be arranged in a well-balanced manner.

[0056] Furthermore, the first conductor, the second conductor, and the third conductor that constitute the first main circuit conductor are fastened to insulators fixed to the pressure vessel by fastening bolts, This makes it possible to reduce the number of connection points for connecting the first main circuit conductors and the number of connection bolts.

[0057] In the above embodiment, a gas-insulated switchgear having a disconnector and a circuit breaker with the structure shown in Figures 1 to 5 has been described as a gas-insulated switchgear. However, the technology of the present disclosure can be applied to any gas-insulated switchgear having a structure in which a first main circuit conductor and a second main circuit conductor are connected inside a pressure vessel in which an insulating gas is sealed.

[0058] Although the present disclosure describes exemplary embodiments, the various features, aspects, and functions described in the embodiments are not limited to application to a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not illustrated are contemplated within the scope of the technology disclosed in this specification, including, for example, the modification, addition, or omission of at least one component. [Explanation of symbols]

[0059] 100 Gas-insulated switchgear, 10 Disconnecting switch module, 11 Pressure vessel, 20 Disconnecting switch, 30 Circuit breaker module, 40 Circuit breaker, 50 First main circuit conductor, 51 First conductor, 52 Second conductor, 53 Third conductor, 60 Second main circuit conductor, 61 Fourth conductor, 62 Fifth conductor, 63 Sixth conductor, 70 Third main circuit conductor, 71 Seventh conductor, 72 Eighth conductor, 73 Ninth conductor, L1 First axis, L2 Second axis, L3 Third axis, L4 Fourth axis, L5 Fifth axis, L6 Sixth axis, θ1 First angle, θ2 Second angle, θ3 Third angle, θ4 Fourth angle, θ5 Fifth angle, θ6 Sixth angle, 130 Insulator, 131 First insulator, 132 Second insulator, 133 Third insulator, 140 Frame, 161 first electric field relaxation conductor, 162 second electric field relaxation conductor, 163 third electric field relaxation conductor, 171 first angle conversion conductor, 172 second angle conversion conductor, 173 third angle conversion conductor, 181 first fastening bolt, 182 second fastening bolt, 183 third fastening bolt, 191 first connecting bolt, 192 second connecting bolt, 193 third connecting bolt.

Claims

1. Inside a pressure vessel filled with insulating gas, a three-phase first main circuit conductor including a first conductor, a second conductor, and a third conductor arranged parallel to one another along an XY plane; a second main circuit conductor consisting of fourth conductors, fifth conductors, and sixth conductors connected to the first conductor, the second conductor, and the third conductor of the first main circuit conductor by first connection bolts, second connection bolts, and third connection bolts, respectively, and extending toward one side of a Z-axis perpendicular to the XY plane; The first main circuit conductor has the second conductor at the center, and the first conductor and the third conductor disposed on both sides of the second conductor, When the axis of the first conductor is defined as a first axis, the axis of the second conductor is defined as a second axis, the axis of the third conductor is defined as a third axis, the axis of the long side portion of the fourth conductor is defined as a fourth axis, the axis of the long side portion of the fifth conductor is defined as a fifth axis, and the axis of the long side portion of the sixth conductor is defined as a sixth axis, a first angle rising from the first axis line toward the fourth axis line from the XY plane to one side of the Z axis is an acute angle, and a third angle rising from the third axis line toward the sixth axis line from the XY plane to one side of the Z axis is an acute angle.

2. 2. The gas-insulated switchgear according to claim 1, wherein a second angle rising from the XY plane to one side of the Z axis toward the fifth axis is a right angle.

3. 2. The gas-insulated switchgear according to claim 1, wherein, when the second axis is defined as an X-axis, the fourth conductor rises from the first conductor toward one side of the X-axis, and the sixth conductor rises from the third conductor toward the other side of the X-axis.

4. A gas-insulated switchgear as described in claim 2, wherein, when the second axis is the X-axis, the fourth conductor rises from the first conductor toward one side of the X-axis, and the sixth conductor rises from the third conductor toward the other side of the X-axis.

5. The gas-insulated switchgear according to claim 1 , wherein the first angle and the third angle are equal.

6. A gas-insulated switchgear as described in claim 2, wherein the first angle and the third angle are equal.

7. A gas-insulated switchgear as described in claim 3, wherein the first angle and the third angle are equal.

8. A gas-insulated switchgear as described in claim 4, wherein the first angle and the third angle are equal.

9. the fourth conductor rises obliquely from the first conductor toward the second conductor, the sixth conductor rises obliquely from the third conductor toward the second conductor, a fourth angle, which is an angle between a projection line when the first axis line and the fourth axis line are projected onto an XY plane, is an acute angle; 9. The gas-insulated switchgear according to claim 1, wherein a sixth angle, which is an angle between a projection line of the third axis and the sixth axis when projected onto an XY plane, is an acute angle.

10. The gas-insulated switchgear according to claim 9 , wherein the fourth angle and the sixth angle are equal.

11. 9. The gas-insulated switchgear according to claim 1, wherein the fourth conductor, the fifth conductor, and the sixth conductor constituting the second main circuit conductor are connected to seventh conductor, eighth conductor, and ninth conductor constituting a third main circuit conductor, respectively.

12. 12. The gas-insulated switchgear according to claim 11, wherein the seventh conductor, the eighth conductor, and the ninth conductor that constitute the third main circuit conductor are arranged parallel to one another along an XY plane.

13. 9. The gas-insulated switchgear according to claim 1, wherein the first conductor, the second conductor, and the third conductor constituting the first main circuit conductor are fastened to insulators fixed to the pressure vessel by fastening bolts.

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