Disconnection structure and switching device

Abstract

To obtain a disconnection structure that can improve the voltage withstand performance of the disconnection section. [Solution] The disconnection structure 100 electrically connects a fixed unit 1 and a movable unit 2 configured to be movable relative to the fixed unit 1. The disconnection structure 100 includes a concave first disconnection portion 11 provided on the fixed unit 1 and a second disconnection portion 21 provided on the movable unit 2, which is fitted into the concave part of the first disconnection portion 11 and electrically connected to the first disconnection portion 11. The second disconnection portion 21 is provided with a creepage structure 214 on its outer circumferential surface that is fitted into the concave part of the first disconnection portion 11 to extend the creepage distance.

Description

Technical Field

[0001] The present disclosure relates to a disconnection structure and a switching device configured such that a fixed unit and a movable unit can be electrically connected.

Background Art

[0002] Conventionally, a disconnection structure configured such that a fixed unit and a movable unit can be electrically connected is known. For example, Patent Document 1 discloses a solid insulation switching device having a circuit breaker configured such that a fixed unit and a movable unit can be electrically connected. The fixed unit has a first fixed-side disconnection part electrically connected to a power cable and a second fixed-side disconnection part electrically connected to an inter-panel bus bar. The movable unit has a first movable-side disconnection part connected to the first fixed-side disconnection part of the fixed unit and a second movable-side disconnection part connected to the second fixed-side disconnection part of the fixed unit. When the first fixed-side disconnection part and the first movable-side disconnection part are connected and the second fixed-side disconnection part and the second movable-side disconnection part are connected, the fixed unit and the movable unit are electrically connected, and the power cable and the inter-panel bus bar are electrically connected.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the technique disclosed in Patent Document 1, for example, humidity may occur in the gap between the first fixed-side disconnection part and the first movable-side disconnection part, generating moisture, and there is a risk that the moisture may reach the energized part where the electrical connection is made. The same applies to the second fixed-side disconnection part and the second movable-side disconnection part. That is, in the conventional switching device, there is a problem that the withstand voltage performance of the disconnection part is low.

[0005] This disclosure has been made in view of the above, and aims to provide a disconnection structure that can improve the voltage withstand performance of the disconnection section. [Means for solving the problem]

[0006] To solve the above-mentioned problems and achieve the objective, the disconnection structure according to this disclosure electrically connects a fixed unit and a movable unit configured to be movable relative to the fixed unit. The disconnection structure comprises a concave first disconnection portion provided in the fixed unit and a second disconnection portion provided in the movable unit, fitted into the concave part of the first disconnection portion, and electrically connected to the first disconnection portion. The second disconnection portion is provided with a creepage structure on its outer circumferential surface that is fitted into the concave part of the first disconnection portion to extend the creepage distance. [Effects of the Invention]

[0007] The disconnection structure described herein has the effect of improving the voltage withstand performance of the disconnection section. [Brief explanation of the drawing]

[0008] [Figure 1] Side view showing the opening / closing device according to Embodiment 1 [Figure 2] Rear view showing the opening / closing device according to Embodiment 1 [Figure 3] A cross-sectional view showing the disconnection structure of a switchgear according to Embodiment 1, in which the cable joint and the cable-side disconnection portion are connected. [Figure 4] A cross-sectional view showing the disconnection structure of a switching device according to Embodiment 1, in which the busbar joint and the busbar-side disconnection section are connected. [Figure 5] A schematic side view of the opening / closing device according to Embodiment 1, showing the stage before the fixed unit and the movable unit are connected. [Figure 6] A schematic side view showing the state in which the fixed unit and the movable unit are electrically connected in the opening / closing device according to Embodiment 1. [Figure 7]A cross-sectional view showing the disconnection structure of a switchgear according to Embodiment 2, in which the cable joint and the cable-side disconnection portion are connected. [Figure 8] A cross-sectional view showing the disconnection structure of a switchgear according to Embodiment 2, in which the busbar coupling and the busbar-side disconnection section are connected. [Figure 9] A cross-sectional view showing a disconnection structure in a modified example of the switchgear according to Embodiment 2, in which the cable joint and the cable-side disconnection section are connected. [Modes for carrying out the invention]

[0009] Hereinafter, the disconnection structure and switching device according to the embodiments of this disclosure will be described in detail with reference to the drawings.

[0010] Embodiment 1. Figure 1 is a side view showing a switchgear 200 according to Embodiment 1. As shown in Figure 1, the switchgear 200 is a solid-state insulated switchgear comprising a fixed unit 1 and a movable unit 2 configured to be movable relative to the fixed unit 1. The switchgear 200 includes disconnection structures 100, 101 that electrically connect the fixed unit 1 and the movable unit 2. The fixed unit 1 comprises a fixed unit body 10 fixed to a support base 300, a cable joint 11 to which a power cable 3 is connected, and a bus joint 12 to which an inter-panel bus 4 is connected. The cable joint 11 and the bus joint 12 each constitute a first disconnection section for electrically connecting the fixed unit 1 and the movable unit 2.

[0011] The movable unit 2 includes a movable unit body 20 configured to move on a support base 300 by driving wheels 20a, a cable-side disconnection section 21 connected to the cable joint 11, and a busbar-side disconnection section 22 connected to the busbar joint 12. The movable unit 2 also includes a disconnection section 24 disposed between the cable-side disconnection section 21 and the busbar-side disconnection section 22, which electrically opens and closes the connection between the two sections, and an operating section 25 for operating the movement of the movable unit body 20 and the opening and closing of the disconnection section 24. The cable-side disconnection section 21 and the busbar-side disconnection section 22 each constitute a second disconnection section for electrically connecting the fixed unit 1 and the movable unit 2.

[0012] The switchgear 200 is configured such that the movable unit 2, which has been moved to the front side of the fixed unit 1, is connected to the fixed unit 1, thereby electrically connecting the fixed unit 1 and the movable unit 2, and electrically connecting the power cable 3 and the inter-panel busbar 4.

[0013] Figure 2 is a rear view showing a switchgear 200 according to Embodiment 1. As shown in Figure 2, multiple switchgears 200 are arranged in a row in the left-right direction of Figure 2, which is the first direction A, with the sides of adjacent fixed unit bodies 10 facing each other, and are electrically connected to one another. On the rear side of the fixed unit body 10, there are three busbar connectors 12 and three inter-panel busbars 4 corresponding to the three phases. The three busbar connectors 12 are arranged at different heights and fixed to the fixed unit body 10. The three inter-panel busbars 4 are provided almost horizontally along the first direction A. Adjacent switchgears 200 are electrically connected by the inter-panel busbars 4 connected to the busbar connectors 12 provided for each phase. Also on the rear side of the fixed unit body 10, there are three cable connectors 11 corresponding to the three phases and three power cables 3 arranged in a row along the first direction A. The power cable 3 is connected to a cable joint 11 provided for each phase.

[0014] Figure 3 is a cross-sectional view showing the disconnection structure 100 of the switchgear 200 according to Embodiment 1, in which the cable joint 11 and the cable-side disconnection section 21 are connected. As shown in Figure 3, the cable joint 11 constituting the first disconnection section has a concave shape. The cable joint 11 has an internal conductor 110 and a cylindrical joint insulator 111. The internal conductor 110 is covered by the cylindrical joint insulator 111 and is electrically insulated from the outside. The joint insulator 111 has an inner surface that is inclined and widens toward the cable-side disconnection section 21.

[0015] On the other hand, the cable-side disconnect section 21, which constitutes the second disconnect section, is fitted into the recess of the cable joint 11 and electrically connected to the cable joint 11. The cable-side disconnect section 21 has an internal conductor 210, a finger contact 211, and an insulating member 212. The internal conductor 210 is covered by the insulating member 212 and electrically insulated from the outside. One end of the internal conductor 210 is connected to the main circuit 23 located inside the movable unit 2. The finger contact 211 has a bottomed cylindrical shape with a U-shaped cross-section. The bottom surface of the finger contact 211 is screwed to the tip of the internal conductor 210 and connected to the internal conductor 210. The outer surface of the finger contact 211 is covered by the insulating member 212, and the opening at the tip is exposed to the outside. The opening at the tip of the finger contact 211 is configured to make contact with appropriate elastic force, and the internal conductor 110 of the cable joint 11 can be inserted into it. The insulating member 212 has an outer surface that is tapered toward the cable joint 11 and has an inclined surface 213. The insulating member 212 is fitted into the recess of the joint insulator 111 of the cable joint 11. When the insulating member 212 of the cable-side disconnect section 21 is fitted into the joint insulator 111 of the cable joint 11, the internal conductor 110 of the cable joint 11 is inserted into the opening of the finger contact 211, and the cable joint 11 and the cable-side disconnect section 21 are electrically connected. As a result, current flows in the following order: main circuit 23, internal conductor 210 of the cable-side disconnect section 21, finger contact 211, internal conductor 110 of the cable joint 11, and power cable 3.

[0016] Also, as shown in FIG. 3, the cable-side disconnection portion 21 is provided with a creepage structure 214 that extends the creepage distance on the outer peripheral surface of an insulating member 212 that is fitted into the recess of the cable joint 11. The creepage structure 214 is provided to suppress a situation where moisture is generated due to humidity in the gap between the cable joint 11 of the fixed unit 1 and the cable-side disconnection portion 21 of the movable unit 2, and the moisture reaches the energized portion that is electrically connected. The creepage structure 214 is, for example, a configuration in which folds are formed on the outer peripheral surface composed of an inclined surface 213. The unevenness constituting the folds is not limited to the five shown in the figure, and there may be one or more. Note that the creepage structure 214 is not limited to the shown folds, and other forms may be used as long as the creepage distance can be extended.

[0017] Note that the inner surface of the joint insulator 111 of the cable joint 11 is not limited to the inclined surface 112 shown in the figure, and may be configured as a horizontal surface. In this case, the outer surface of the insulating member 212 of the cable-side disconnection portion 21 is also made a horizontal surface so that it can be fitted into the recess of the joint insulator 111. The creepage structure 214 is provided on the outer peripheral surface of the insulating member 212 composed of a horizontal surface.

[0018] FIG. 4 is a cross-sectional view showing a disconnection structure 101 of the opening / closing device 200 according to Embodiment 1, in a state where the busbar joint 12 and the busbar-side disconnection part 22 are connected. As shown in FIG. 4, the busbar joint 12 constituting the first disconnection part has a concave configuration. The busbar joint 12 has an internal conductor 120 and a cylindrical joint insulator 121. The internal conductor 120 has a substantially T shape. The internal conductor 120 is fixed to the joint insulator 121 by a fixing bolt 13. The internal conductor 120 has a first conductor 120a extending along a first direction A, and a second conductor 120b protruding from the central part of the first conductor 120a toward the busbar-side disconnection part 22. The internal conductor 120 is covered by the cylindrical joint insulator 121 and is electrically insulated from the outside. The joint insulator 121 has a first insulating part 121a covering the first conductor 120a and a second insulating part 121b covering the second conductor 120b. The first insulating part 121a has an opening in a portion facing the inter-panel busbar 4. The second insulating part 121b has an opening toward the busbar-side disconnection part 22 constituting the second disconnection part. The second insulating part 121b has an inner surface that is enlarged in diameter toward the busbar-side disconnection part 22 constituting the second disconnection part and is an inclined surface 122.

[0019] On the other hand, the busbar-side disconnect section 22, which constitutes the second disconnect section, is fitted into the recess of the busbar joint 12 and electrically connected to the busbar joint 12. The busbar-side disconnect section 22 has an internal conductor 220, a finger contact 221, and an insulating member 222. The internal conductor 220 is covered by the insulating member 222 and electrically insulated from the outside. One end of the internal conductor 220 is connected to the main circuit 23 located inside the movable unit 2. The finger contact 221 has a bottomed cylindrical shape with a U-shaped cross-section. The bottom surface of the finger contact 221 is screwed to the tip of the internal conductor 220 and connected to the internal conductor 220. The outer surface of the finger contact 221 is covered by the insulating member 222, and the opening at the tip is exposed to the outside. The opening at the tip of the finger contact 221 is configured to make contact with appropriate elastic force, allowing the second conductor 120b of the busbar joint 12 to be inserted. The insulating member 222 has an outer surface that is tapered toward the busbar joint 12 and has an inclined surface 223. The insulating member 222 is fitted into the second insulating portion 121b, which is the recessed interior of the joint insulator 121 of the busbar joint 12. When the insulating member 222 of the busbar-side disconnect portion 22 is fitted into the second insulating portion 121b of the busbar joint 12, the second conductor 120b of the busbar joint 12 is inserted into the opening of the finger contact 221, and the busbar joint 12 and the busbar-side disconnect portion 22 are electrically connected. As a result, the current flows in the following order: the internal conductor 120 of the busbar coupling 12, the finger contact 221 of the busbar-side disconnect section 22, the internal conductor 220 of the busbar-side disconnect section 22, and finally the main circuit 23.

[0020] Furthermore, as shown in Figure 4, the busbar-side disconnect section 22 is provided with a creepage structure 224 on the outer circumferential surface of the insulating member 222 that is fitted into the recess of the busbar joint 12, thereby extending the creepage distance. The creepage structure 224 is provided to suppress the situation in which humidity is generated in the gap between the busbar joint 12 of the fixed unit 1 and the busbar-side disconnect section 22 of the movable unit 2, causing moisture to be generated and reaching the electrically connected energized parts. As an example, the creepage structure 224 has a configuration in which folds are formed on the outer circumferential surface consisting of an inclined surface 223. The folds are not limited to the five shown, but one or more are sufficient. Note that the creepage structure 224 is not limited to the folds shown, and other forms are also acceptable as long as they can extend the creepage distance.

[0021] Furthermore, the inner surface of the joint insulator 121 of the busbar joint 12 is not limited to the inclined surface 122 shown in the figure, but may also be configured as a horizontal surface. In this case, the outer surface of the insulating member 222 of the busbar-side disconnect section 22 is also made horizontal so that it can be fitted into the recess of the joint insulator 121. The creepage structure 224 is provided on the outer circumferential surface of the insulating member 222, which is made of a horizontal surface.

[0022] As shown in Figure 4, the inter-panel busbar 4 has a busbar 40 extending in a first direction A, finger contacts 41 provided at both ends of the busbar 40, and a busbar insulator 42 covering the busbar 40 and the finger contacts 41. The inter-panel busbar 4 is attached to the busbar joint 12 by fastening bolts 43 to the joint insulator 121. The busbar 40 is electrically insulated from the outside by being covered by the busbar insulator 42. The finger contacts 41 are bottomed cylindrical with a U-shaped cross-section. The finger contacts 41 are connected to the busbar 40 by screwing their bottom ends to the ends of the busbar 40. The outer surface of the finger contacts 41 is covered by the busbar insulator 42, and the opening at the tip is exposed to the outside. The opening at the tip of the finger contact 41 is configured to make contact with appropriate elastic force, and the first conductor 120a of the internal conductor 120 can be inserted into it. The internal conductor 120 is electrically connected to the busbar 40 via the finger contact 41. As a result, the current flows in the following order: busbar 40, finger contact 41 of the inter-panel busbar 4, internal conductor 120 of the busbar joint 12, finger contact 221 of the busbar-side disconnect section 22, and internal conductor 220 of the busbar-side disconnect section 22.

[0023] Figure 5 is a schematic side view of the switchgear 200 according to Embodiment 1, showing the stage before the fixed unit 1 and the movable unit 2 are connected. Figure 6 is a schematic side view of the switchgear 200 according to Embodiment 1, showing the state in which the fixed unit 1 and the movable unit 2 are electrically connected. Note that Figures 5 and 6 show only one phase of the three phases, i.e., a single pole, but in reality there are single poles for all three phases.

[0024] As shown in Figure 5, in the switchgear 200 according to Embodiment 1, when the movable unit 2 is moved in a second direction B toward the fixed unit 1 from a state in which the fixed unit 1 and the movable unit 2 are separated, the cable side disconnection section 21 and the cable joint 11 make electrical contact, and the busbar side disconnection section 22 and the busbar joint 12 make electrical contact. As a result, as shown in Figure 6, the switchgear 200 is in a state in which the fixed unit 1 and the movable unit 2 are electrically connected. In the switchgear 200 according to Embodiment 1, when the fixed unit 1 and the movable unit 2 are electrically connected, the current from the inter-panel busbar 4 flows in the following order: busbar joint 12, busbar side disconnection section 22, disconnection section 24, cable side disconnection section 21, cable joint 11, and power cable 3. On the other hand, in the switching device 200 according to Embodiment 1, by moving the movable unit 2 in the opposite direction to the second direction B from a state in which the fixed unit 1 and the movable unit 2 are connected, the connection between the cable-side disconnection section 21 and the cable joint 11 is released, and the connection between the busbar-side disconnection section 22 and the busbar joint 12 is released, thereby interrupting the current flowing between the inter-panel busbar 4 and the power cable 3.

[0025] Incidentally, in the switchgear 200 according to Embodiment 1, for example, humidity may be generated in the gap between the cable joint 11 of the fixed unit 1 and the cable-side disconnection section 21 of the movable unit 2, causing moisture to be generated and potentially reaching the electrically connected energized parts. The same applies to the bus joint 12 of the fixed unit 1 and the bus-side disconnection section 22 of the movable unit 2.

[0026] Therefore, the opening / closing device 200 according to Embodiment 1 includes a disconnection structure 100, 101 that electrically connects a fixed unit 1 and a movable unit 2 configured to be movable relative to the fixed unit 1. The disconnection structure 100, 101 includes a concave first disconnection portion 11, 12 provided on the fixed unit 1, and a second disconnection portion 21, 22 provided on the movable unit 2, which is fitted into the concave part of the first disconnection portion 11, 12 and electrically connected to the first disconnection portion 11, 12. The second disconnection portion 21, 22 is provided with a creepage structure 214, 224 on its outer circumferential surface that is fitted into the concave part of the first disconnection portion 11, 12 to extend the creepage distance. Therefore, in the switchgear 200 according to Embodiment 1, even if humidity is generated and moisture is produced in the gap between the first disconnecting sections 11, 12 of the fixed unit 1 and the second disconnecting sections 21, 22 of the movable unit 2, the creepage structures 214, 224 can suppress the situation in which moisture reaches the energized part, thereby improving the withstand voltage performance of the disconnecting section. Moisture accumulated in the creepage structure 214 accumulates below the folds, flows along the inclined surface 112 of the joint insulator 111, and is discharged to the outside through the gap between the inner surface of the joint insulator 111 and the outer surface of the insulating member 212. Similarly, moisture accumulated in the creepage structure 224 accumulates below the folds, flows along the inclined surface 122 of the joint insulator 121, and is discharged to the outside through the gap between the inner surface of the joint insulator 121 and the outer surface of the insulating member 222.

[0027] In the first embodiment, the switchgear 200 is configured such that the cable-side disconnect section 21 and the busbar-side disconnect section 22 are designated as second disconnect sections, and creepage structures 214 and 224 are provided on these second disconnect sections. However, the device is not limited to this configuration, and the creepage structures 214 and 224 may be provided on only one of the cable-side disconnect section 21 and the busbar-side disconnect section 22.

[0028] Embodiment 2. Next, the disconnection structure 100A of the switchgear 200 according to Embodiment 2 will be described. Note that components identical to those in Embodiment 1 are denoted by the same reference numerals, and their descriptions are omitted as appropriate. Figure 7 is a cross-sectional view showing the disconnection structure 100A of the switchgear 200 according to Embodiment 2, with the cable joint 11 and the cable-side disconnection section 21 connected.

[0029] As shown in Figure 7, in the disconnection structure 100A of the switchgear 200 according to Embodiment 2, a creepage structure 214 that extends the creepage distance is provided on the outer circumferential surface of the insulating member 212 of the cable-side disconnection section 21, and a creepage structure 113 that extends the creepage distance is also provided on the inner circumferential surface of the joint insulator 111 of the cable joint 11. The other configurations are the same as in Embodiment 1.

[0030] The creepage structure 113 is provided to prevent moisture from being generated in the gap between the cable joint 11 of the fixed unit 1 and the cable-side disconnection section 21 of the movable unit 2, and for this moisture to reach the electrically connected energized section. As an example, the creepage structure 113 has a configuration in which folds are formed on the inner circumferential surface consisting of an inclined surface 112. The irregularities constituting the folds are not limited to the five shown in the figure, but one or more are sufficient. Furthermore, the creepage structure 113 is not limited to the folds shown in the figure, and other forms are also acceptable as long as the creepage distance can be extended.

[0031] Figure 8 is a cross-sectional view showing the disconnection structure 101A of the switchgear 200 according to Embodiment 2, in which the bus joint 12 and the bus side disconnection section 22 are connected. As shown in Figure 8, in the disconnection structure 101A of the switchgear 200 according to Embodiment 2, a creepage structure 224 is provided on the outer circumferential surface of the insulating member 222 of the bus side disconnection section 22 to extend the creepage distance, and a creepage structure 123 is also provided on the inner circumferential surface of the second insulating section 121b of the joint insulator 121 in the bus joint 12 to extend the creepage distance. The other configurations are the same as in Embodiment 1.

[0032] The creepage structure 123 is provided to prevent moisture from being generated in the gap between the busbar joint 12 of the fixed unit 1 and the busbar-side disconnect section 22 of the movable unit 2, and to prevent this moisture from reaching the electrically connected energized section. As an example, the creepage structure 123 has a configuration in which folds are formed on the inner circumferential surface consisting of an inclined surface 122. The irregularities constituting the folds are not limited to the five shown in the figure, but one or more are sufficient. Furthermore, the creepage structure 123 is not limited to the folds shown in the figure, and other forms are also acceptable as long as the creepage distance can be extended.

[0033] In the disconnection structures 100A and 101A of the switchgear 200 according to Embodiment 2, the first disconnection sections 11 and 12 are provided with creepage structures 113 and 123 on the inner circumferential surface into which the second disconnection sections 21 and 22 are fitted, thereby extending the creepage distance. Therefore, in the switchgear 200 according to Embodiment 2, even if humidity is generated in the gap between the first disconnection sections 11 and 12 of the fixed unit 1 and the second disconnection sections 21 and 22 of the movable unit 2, and this moisture adheres to the inner circumferential surface of the first disconnection sections 11 and 12, the creepage structures 113 and 123 can suppress the moisture from reaching the energized portion, thereby improving the dielectric strength of the disconnection section.

[0034] In the switchgear 200 according to Embodiment 2, the cable joint 11 and the busbar joint 12 are configured as the first disconnection section and are provided with creepage structures 113 and 123. However, this is not limited to this configuration, and the creepage structures 113 and 123 may be provided only on one of the disconnection sections of the cable joint 11 and the busbar joint 12. Also, in the switchgear 200 according to Embodiment 2, the cable-side disconnection section 21 and the busbar-side disconnection section 22 are configured as the second disconnection section and are provided with creepage structures 214 and 224 on the second disconnection section. However, this is not limited to this configuration, and the creepage structures 214 and 224 may be provided only on one of the disconnection sections of the cable-side disconnection section 21 and the busbar-side disconnection section 22.

[0035] Figure 9 is a cross-sectional view showing a disconnection structure 100B in a modified example of the switchgear 200 according to Embodiment 2, in which the cable joint 11 and the cable-side disconnection section 21 are connected. As shown in Figure 9, in the disconnection structure 100B in the modified example of Embodiment 2, the joint insulator 111 of the cable joint 11 has drainage holes 114 formed therein to discharge moisture accumulating in the creepage structure 113 to the outside. As shown in Figure 9, the drainage holes 114 may be formed in one location in the grooves constituting the creepage structure 113, or they may be formed in multiple locations in the grooves. As shown in Figure 9, by forming the drainage holes 114 in the grooves at the ends of the inclined surface 112, moisture flowing along the inclined surface 112 can be effectively drained to the outside. As a result, even if humidity is generated in the gap between the first disconnection section 11 of the fixed unit 1 and the second disconnection section 21 of the movable unit 2, this moisture can be efficiently drained to the outside, thereby preventing moisture from reaching the energized part and improving the voltage resistance performance of the disconnection section.

[0036] Although not shown in the diagram, drainage holes 114 may be formed in the joint insulator 121 of the busbar joint 12 to discharge moisture that accumulates in the creepage structure 123 to the outside.

[0037] The configurations shown in the above embodiments are merely examples and can be combined with other known technologies, or the embodiments themselves can be combined. Furthermore, it is possible to omit or modify parts of the configuration without departing from the gist of the invention.

[0038] The various aspects of this disclosure are summarized below as an appendix.

[0039] (Note 1) A disconnection structure that electrically connects a fixed unit and a movable unit configured to be movable relative to the fixed unit, The fixed unit has a concave first disconnection section, The movable unit is provided with a second disconnecting portion which is fitted into the recess of the first disconnecting portion and electrically connected to the first disconnecting portion, The second disconnect portion is provided with a creepage structure on its outer surface, which is fitted into the recess of the first disconnect portion, to extend the creepage distance. A disconnection structure characterized by the following features. (Note 2) The outer circumferential surface of the second disconnect portion is provided with a surface structure consisting of folds. The disconnection structure described in Appendix 1, characterized by the features described herein. (Note 3) The first disconnect section is provided with a creepage structure on its inner circumferential surface into which the second disconnect section is fitted, which extends the creepage distance. The disconnection structure described in Appendix 1 or 2, characterized by the above. (Note 4) The inner circumferential surface of the first disconnected section is provided with a surface structure consisting of folds. The disconnection structure described in Appendix 3, characterized by the features described herein. (Note 5) The first disconnected section has drainage holes for draining moisture that accumulates in the creepage structure formed on the inner circumferential surface to the outside. The disconnection structure described in Appendix 3 or 4, characterized by the above. (Note 6) The first disconnected section has an inner surface that is widened in diameter toward the second disconnected section and has an inclined surface. The second disconnect portion is made inclined by reducing its diameter toward the first disconnect portion and has an outer surface that fits into the recess of the first disconnect portion. A disconnection structure as described in any one of the appendices 1 to 5, characterized by the features described herein. (Note 7) A switchgear that is arranged in a row in a first direction and is electrically connected to each other via inter-panel busbars, Fixed unit and The system comprises a movable unit configured to be movable relative to the fixed unit and electrically connected to the fixed unit, The fixing unit has a concave first disconnection portion, The movable unit has a second disconnecting portion that is fitted into the recess of the first disconnecting portion and electrically connected to the first disconnecting portion. The second disconnect portion is provided with a creepage structure on its outer surface, which is fitted into the recess of the first disconnect portion, to extend the creepage distance. A switching device characterized by the following features. [Explanation of Symbols]

[0040] 1 Fixed unit, 2 Movable unit, 3 Power cable, 4 Inter-panel busbar, 10 Fixed unit body, 11 Cable joint (first disconnection section), 12 Busbar joint (first disconnection section), 13 Fixing bolt, 20 Movable unit body, 20a Wheel, 21 Cable side disconnection section (second disconnection section), 22 Busbar side disconnection section (second disconnection section), 23 Main circuit, 24 Interruption section, 25 Operating section, 40 Busbar, 41, 211, 221 Finger contact, 42 Busbar insulator, 43 Fastening bolt, 100, 100A, 100B, 101, 101A Disconnection structure, 110, 120, 210, 220 Internal conductor, 111, 121 Joint insulator, 112, 122, 213, 223 Inclined surface, 113, 123, 214, 224 creepage structure, 114 drainage hole, 120a first conductor, 120b second conductor, 121a first insulating part, 121b second insulating part, 200 switchgear, 212, 222 insulating member, 300 support base.

Claims

1. A disconnection structure that electrically connects a fixed unit and a movable unit configured to be movable relative to the fixed unit, The fixed unit has a concave first disconnection section, The movable unit is provided with a second disconnecting portion which is fitted into the recess of the first disconnecting portion and electrically connected to the first disconnecting portion, The second disconnect portion is provided with a creepage structure on its outer surface, which is fitted into the recess of the first disconnect portion, to extend the creepage distance. A disconnection structure characterized by the following features.

2. The outer circumferential surface of the second disconnect portion is provided with a surface structure consisting of folds. The disconnection structure according to feature 1.

3. The first disconnect section is provided with a creepage structure on its inner circumferential surface into which the second disconnect section is fitted, which extends the creepage distance. The disconnection structure according to feature 1.

4. The inner circumferential surface of the first disconnected section is provided with a surface structure consisting of folds. The disconnection structure according to feature 3.

5. The first disconnected section has drainage holes formed therein to discharge moisture that accumulates in the creepage structure formed on the inner circumferential surface to the outside. The disconnection structure according to feature 3.

6. The first disconnected section has an inner surface that is widened in diameter toward the second disconnected section and has an inclined surface. The second disconnect portion is made inclined by reducing its diameter toward the first disconnect portion and has an outer surface that fits into the recess of the first disconnect portion. The disconnection structure according to any one of claims 1 to 5.

7. A switchgear that is arranged in a line in a first direction and is electrically connected to each other via inter-panel busbars, Fixed unit and The system comprises a movable unit configured to be movable relative to the fixed unit and electrically connected to the fixed unit, The fixing unit has a concave first disconnection portion, The movable unit has a second disconnecting portion that is fitted into the recess of the first disconnecting portion and electrically connected to the first disconnecting portion. The second disconnect portion is provided with a creepage structure on its outer surface, which is fitted into the recess of the first disconnect portion, to extend the creepage distance. A switching device characterized by the following features.

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