Instrument transformer, gas-insulated switchgear, and removal method

Abstract

To easily remove a busbar from an instrument transformer.SOLUTION: An instrument transformer (1) includes a first shuttle bus (11) having a first inner conductor (12) and a first outer conductor (13), and contacts (16) located at both ends of the first shuttle bus (11). When the first inner conductor (12) and a second outer conductor (32) are inserted into and fixed in the contacts (16), a distance (Y) between a first inner conductor end (121) and a second inner conductor end (311) is greater than a length (X) of the portion of the first inner conductor (12) inserted into the contacts (16).SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] One aspect of the present invention relates to an instrument transformer and a gas-insulated switchgear or the like that includes the instrument transformer. [Background technology]

[0002] Patent Document 1 discloses a gas-insulated switchgear equipped with a voltage current transformer (VCT). In the gas-insulated switchgear of Patent Document 1, an inner busbar of a coaxial busbar arranged in a busbar connection pipe and an inner conductor of a coaxial connection conductor arranged in a VCT connection pipe are connected via a contact. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 7-231524 Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 does not disclose a method for removing the inner conductor or the inner busbar when the busbar connection pipe and the VCT connection pipe are connected.

[0005] One aspect of the present invention is to facilitate the removal of busbars from an instrument transformer. [Means for solving the problem]

[0006] An instrument transformation device according to one embodiment of the present invention comprises: an instrument transformer that transforms voltage and current; a first shuttle bus that is electrically connected to the instrument transformer and has a first inner conductor and a first outer conductor positioned around the first inner conductor; and contactors that are positioned at both ends of the first shuttle bus and electrically connect (1) the first inner conductor and (2) the second inner conductor in a second shuttle bus that has a second inner conductor and a second outer conductor positioned around the second inner conductor; and when the first inner conductor and the second inner conductor are inserted and fixed inside the contactors, the distance between the end of the first inner conductor and the end of the second inner conductor inside the contactors is greater than the length of the portion of the first inner conductor inserted inside the contactors.

[0007] A removal method according to one aspect of the present invention includes a first shuttle busbar electrically connected to an instrument transformer that transforms voltage and current and having a first inner conductor and a plurality of first outer conductors positioned around the first inner conductor, the first outer conductors positioned at both ends of the first shuttle busbar being moved along the first inner conductor toward the center of the first shuttle busbar; and a second shuttle busbar located at both ends of the first shuttle busbar and having (1) the first inner conductor and (2) a second inner conductor and a second outer conductor positioned around the second inner conductor, the second inner conductors being moved along the first inner conductor toward the center of the first shuttle busbar. and a second moving step of moving one of the contacts that electrically connects the first and second inner conductors in a direction to pull out the end of the first inner conductor from inside the contact, wherein the second moving step pulls out the end of the first inner conductor from inside the contact by moving the first inner conductor a distance that is greater than the length of the portion of the first inner conductor inserted into the contact, and is between the end of the first inner conductor and the end of the second inner conductor inside the contact when the first inner conductor and the second inner conductor are inserted and fixed inside the contact. [Effects of the Invention]

[0008] According to one aspect of the present invention, the busbars can be easily removed from the instrument transformer. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a side view showing a schematic configuration of a gas-insulated switchgear according to an embodiment. [Figure 2] 1 is a cross-sectional view schematically showing the configuration of an end phase conductor of a one-phase circuit of the internal structure of a three-phase circuit in an instrument transformer device and its peripheral components according to one embodiment. FIG. [Figure 3] FIG. 2 is a cross-sectional view schematically illustrating a region including a contact. [Figure 4] 5 is a flowchart illustrating a method for removing a first return bus and an instrument transformer according to one embodiment. [Figure 5] FIG. 10 is a cross-sectional view schematically showing each region including the contact, illustrating a state in which the end outer conductor has been moved toward the center of the first return busbar. [Figure 6] FIG. 2 is a cross-sectional view schematically showing each region including the contact, illustrating a state in which one first inner conductor end portion is pulled out from inside the contact. [Figure 7] FIG. 10 is a side view schematically showing a gas-insulated switchgear as a comparative example, illustrating the removal of a first shuttle busbar. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of the present invention will be described in detail below with reference to Figures 1 to 7. For convenience of explanation, the right side of the drawing will be referred to as the right direction, the left side as the left direction, and the front side of the drawing relative to the left-right direction will be referred to as the front direction.

[0011] [Gas-insulated switchgear 100] FIG. 1 is a side view showing a schematic configuration of a gas-insulated switchgear 100. The gas-insulated switchgear 100 is equipment installed in a substation. The container of the gas-insulated switchgear 100 is filled with insulating gas. As the insulating gas, for example, an environmentally friendly gas may be used. The environmentally friendly gas may be, for example, fluoronitrile, dry air, N2, CO2, O2, CF4, fluoroketone, or a mixture thereof. Alternatively, for example, SF6 may be used as the insulating gas.

[0012] As shown in Fig. 1, gas-insulated switchgear 100 includes, for example, an instrument transformer 1, a connecting pipeline 6, and a gas-insulated switchgear 7. In the gas-insulated switchgear 100 shown in Fig. 1, two gas-insulated switchgears 7 are arranged at positions facing each other with the instrument transformer 1 at the center. Each of the two gas-insulated switchgears 7 is electrically connected to the instrument transformer 1 via the connecting pipeline 6. The gas-insulated switchgear 100 may have any configuration as long as the instrument transformer 1 is arranged between the two gas-insulated switchgears 7, and each of the two gas-insulated switchgears 7 is electrically connected to the instrument transformer 1.

[0013] The instrument transformer 1 is a device that transforms the voltage and current of an AC circuit into low voltage and small current, respectively. The gas-insulated switchgear 7 is a device that electrically protects the substation and includes, for example, a busbar, a circuit breaker, a disconnecting switch, a grounding switch, and a lightning arrester. The connecting conduit 6 is placed in the gap between the instrument transformer 1 and the gas-insulated switchgear 7, and connects the instrument transformer 1 and the gas-insulated switchgear 7.

[0014] [Instrument transformer 1 and its peripheral components] The internal structure of the instrument transformer 1 and its peripheral members will be described using Figure 2. Figure 2 is a cross-sectional view that shows a schematic diagram of the end phase conductor configuration of a one-phase circuit of the internal structure of a three-phase circuit in the instrument transformer 1 and its peripheral members.

[0015] <Instrument Transformer 1> As shown in FIG. 2, the instrument transforming device 1 includes, for example, an instrument transformer 10, a first return bus 11, a contact 16, a first connecting conductor 17, and a second connecting conductor 18.

[0016] The potential transformer 10 is a component that transforms voltage and current. The potential transformer 10 is composed of, for example, a voltage transformer and a current transformer. The potential transformer 10 is electrically connected to the first return bus 11.

[0017] The first shuttle bus 11 is electrically connected to a second shuttle bus 30 provided in the connecting pipeline 6. The first shuttle bus 11 includes a first inner conductor 12 and a first outer conductor .

[0018] The first inner conductor 12 may have any shape, such as a cylindrical rod-like member, as long as it can be inserted into the contacts 16 located at both ends thereof and electrically connected to the contacts 16. The first inner conductor 12 may have any shape as long as it can move in the insertion / removal direction when both ends thereof are inserted into the contacts 16. The first inner conductor 12 may also be flexible.

[0019] The first inner conductor 12 is electrically connected to the instrument transformer 10 by the second connecting conductor 18. The first inner conductor 12 and the second connecting conductor 18 are fixed by the second bolt 20 via the first outer conductor 13 (specifically, the central outer conductor 132 and the pipe 133). However, the second connecting conductor 18 is electrically insulated from the first outer conductor 13. By removing the second bolt 20, the first inner conductor 12 becomes movable in the left-right direction.

[0020] The first outer conductor 13 is a conductor that is disposed coaxially with the first inner conductor 12 and is positioned so as to surround the first inner conductor 12. In other words, the first inner conductor 12 is inserted inside the first outer conductor 13. The first outer conductor 13 may be, for example, a tubular member, for example, a substantially cylindrical member.

[0021] In this embodiment, the first return bus 11 includes a plurality of first outer conductors 13. Each of the plurality of first outer conductors 13 functions as an end outer conductor 131, a central outer conductor 132, and a pipe 133.

[0022] The end outer conductors 131 are conductors among the multiple first outer conductors 13 that are located at both ends of the first shuttle busbar 11. The end outer conductors 131 are physically connected and fixed to connecting conductors 8 (described later) provided inside the insulating spacer 5 by bolts (not shown). When the bolts are removed and the end outer conductors 131 are released from their fixation to the connecting conductors 8, the end outer conductors 131 are installed so as to be movable toward the center of the first shuttle busbar 11 in an unfixed state.

[0023] The central outer conductor 132 is a conductor located at the center of the first return busbar 11 in the axial direction. The central outer conductor 132 is electrically connected to the instrument transformer 10 by the first connecting conductor 17. The central outer conductor 132 does not have to be located at the center of the first return busbar 11 in the axial direction. The central outer conductor 132 may be located anywhere between the two end outer conductors 131, as long as it is electrically connected to the instrument transformer 10 by the first connecting conductor 17.

[0024] The central outer conductor 132 and the first connecting conductor 17 are fixed by a first bolt 19. The central outer conductor 132 is made up of two conductors, and these two conductors are fixed by a bolt (not shown). After removing the first bolt 19 and the second bolt 20, the central outer conductor 132 can be disassembled and removed from the instrument transformer 1 by removing the bolt.

[0025] The pipe 133 is a conductor that is positioned so as to cover the first inner conductor 12 and is located closer to the first inner conductor 12 than the end outer conductor 131 and the central outer conductor 132. The pipe 133 can electrically connect the end outer conductor 131 and the central outer conductor 132.

[0026] The contactor 16 is a member that electrically connects the first inner conductor 12 and the second inner conductor 31 that constitutes the second return bus 30. The contactor 16 is located at each end of the first inner conductor 12. The positional relationship between the first inner conductor 12 and the second inner conductor 31 is fixed when inserted inside the contactor 16. The contactor 16 is, for example, a tubular member, and may be, for example, a substantially cylindrical member. In this case, the inner surface of one opening side of the contactor 16 contacts the outer surface of the first inner conductor 12, and the inner surface of the other opening side of the contactor 16 contacts the outer surface of the second inner conductor 31. In this way, the first inner conductor 12 and the second inner conductor 31 are electrically connected via the contactor 16.

[0027] <Adapter 4, insulating spacer 5, and connecting pipe 6> As shown in FIG. 2, the gas-insulated switchgear 100 includes an adapter 4, an insulating spacer 5, and a connecting pipe 6 as peripheral members of the instrument transformer device 1.

[0028] The connecting pipeline 6 has a portion of a second shuttle bus 30 therein. In Fig. 2, the second shuttle bus 30 is electrically connected to a first shuttle bus 11 which is electrically connected to the instrument transformer 10. The second shuttle bus 30 is also electrically connected to a bus (not shown) provided in the gas-insulated switchgear 7. Therefore, the instrument transformer 10 and the gas-insulated switchgear 7 are electrically connected via the first shuttle bus 11 and the second shuttle bus 30.

[0029] The second return busbar 30 includes a second inner conductor 31 and a second outer conductor 32. The second inner conductor 31 may have any shape, such as a cylindrical rod-like member, as long as it is inserted into the contact 16 and electrically connected to the contact 16. The second inner conductor 31 is fixed by a positioning retaining ring 53 and is therefore movable toward the connecting conduit 6 when released from the positioning retaining ring 53. The second outer conductor 32 is arranged coaxially with the first inner conductor 12 and is positioned to surround the second inner conductor 31. In other words, the second inner conductor 31 is inserted into the second outer conductor 32. The second outer conductor 32 is, for example, a tubular member, and may be, for example, a substantially cylindrical member. The second outer conductor 32 is physically connected and fixed to the connecting conductor 8 provided inside the insulating spacer 5 by a bolt (not shown).

[0030] The busbar (not shown) included in the gas-insulated switchgear 7 is also a shuttle busbar that includes an inner conductor and an outer conductor located around the inner conductor. The second inner conductor 31 is electrically connected to the inner conductor included in the gas-insulated switchgear 7 via the contact 16, so that the second shuttle busbar 30 is electrically connected to the busbar included in the gas-insulated switchgear 7.

[0031] The insulating spacer 5 is located between the instrument transformer 1 and the connecting conduit 6 and is a member (non-conductor) that cuts off electrical connection between the outer wall of the instrument transformer 1 and the outer wall of the connecting conduit 6 and the connecting conductor 8. The connecting conductor 8 is located between the instrument transformer 1 and the connecting conduit 6 (inside the insulating spacer 5 in this embodiment) and is a conductor that electrically connects the first outer conductor 13 and the second outer conductor 32. The connecting conductor 8 has a through hole through which the second inner conductor 31 can be inserted. The through hole is larger in diameter than the second inner conductor 31 and smaller in diameter than the first outer conductor 13 and the second outer conductor 32. This electrically connects the first inner conductor 12 and the second inner conductor 31.

[0032] The insulating spacer 5 has a protrusion 51 on a part of its surface facing the instrument transformer 1 that protrudes toward the instrument transformer 1. The insulating spacer 5 also has a protrusion 52 on a part of its surface facing the connecting pipeline 6 that protrudes toward the connecting pipeline 6.

[0033] Convex portion 51 protrudes by length L from the surface surrounding convex portion 51. Convex portion 52 also protrudes by length L from the surface surrounding convex portion 52. This is not limiting, and convex portions 51, 52 may protrude by different amounts. Although convex portions 51, 52 are located in the center of insulating spacer 5, their positions are not particularly limited, and they may be formed in positions that can insulate connecting conductor 8 from the outer wall of instrument transformer 1 and the outer wall of connecting conduit 6. Providing convex portions 51, 52 on insulating spacer 5 improves the insulation between connecting conductor 8 and the outer wall of instrument transformer 1 and the outer wall of connecting conduit 6.

[0034] The adapter 4 is positioned between the instrument transformer 1 and the insulating spacer 5, and has a housing space MR capable of housing the protrusion 51 of the insulating spacer 5. The adapter 4 is, for example, a tubular member, and may be, for example, a substantially cylindrical member. The length between the two openings in the adapter 4 is defined as length M. This length M is the length of the housing space MR in the direction in which the protrusion 51 protrudes (the direction in which the protrusion 51 is inserted into the housing space MR) when the adapter 4 is positioned between the instrument transformer 1 and the insulating spacer 5.

[0035] When the convex portion 51 is accommodated in the accommodation space MR, the length M of the accommodation space MR is greater than the length L of the convex portion 51 in the protruding direction. As a result, when the insulating spacer 5 is disposed between the instrument transformer 1 and the connecting pipeline 6, the convex portion 51 does not get inside the instrument transformer 1. Therefore, when only the instrument transformer 1 is removed toward the front, the insulating spacer 5 does not interfere with the instrument transformer 1.

[0036] Therefore, the adapter 4 may be placed when the insulating spacer 5 has a convex portion 51 on at least a portion of the surface facing the instrument transformer 1. For example, even if the insulating spacer 5 does not have a convex portion 52, as long as it has a convex portion 51, the adapter 4 may be placed between the instrument transformer 1 and the insulating spacer 5. On the other hand, if the insulating spacer 5 does not have a convex portion 51 facing the instrument transformer 1, the adapter 4 does not need to be placed between the instrument transformer 1 and the insulating spacer 5, regardless of whether the convex portion 52 is present or not.

[0037] [Positional relationship between the first reciprocating busbar 11 and the second reciprocating busbar 30 inside the contactor 16] The positional relationship between the contact 16, the first shuttle bus 11, and the second shuttle bus 30 will be explained using Fig. 3. Fig. 3 is a cross-sectional view showing a schematic view of the right-side area AR1 including the contact 16. The left-side area AR2 also has the same structure.

[0038] 3, the first inner conductor 12 and the second inner conductor 31 are fixed in place with the first inner conductor end portion 121 and the second inner conductor end portion 311 inserted into the contact 16. The first inner conductor end portion 121 is an end portion of the first inner conductor 12, and the second inner conductor end portion 311 is an end portion of the second inner conductor 31.

[0039] In this state, if the distance between the first inner conductor end 121 and the second inner conductor end 311 inside the contactor 16 is distance X and the length of the portion of the first inner conductor 12 inserted into the contactor 16 is length Y, then distance X is greater than length Y. For example, the length of the first shuttle busbar 11 and the positional relationship between the first shuttle busbar 11, the second shuttle busbar 30, and the contactor 16 are specified so that distance X is greater than length Y.

[0040] In each of the two contactors 16, the positional relationship between the first and second return busbars 11 and 30 is defined so that the distance X is greater than the length Y. This makes it possible to pull out the first inner conductor end portion 121 from inside one of the contactors 16. After pulling out the first inner conductor end portion 121 from inside one of the contactors 16, the first inner conductor 12 can be removed from the instrument transformer 1 by pulling out the other first inner conductor end portion 121 from inside the other contactor 16.

[0041] In this way, the first inner conductor 12 can be pulled out from the contactor 16 by a simple method, and the first shuttle busbar 11 can be easily removed from the instrument transformer device 1. The fact that the distance X is greater than the length Y makes it possible to pull out the first inner conductor end 121 from inside the contactor 16 will be described in detail below.

[0042] [Method of removing the first return busbar 11 and the instrument transformer 1] A method for removing the first shuttle bus 11 and the instrument transformer 1 will be described with reference to Figures 4 to 6. Figure 4 is a flowchart of the method for removing the first shuttle bus 11 and the instrument transformer 1. Figure 5 is a cross-sectional view schematically showing the regions AR1 and AR2 including the contactor 16, illustrating a state in which the end outer conductor 131 has been moved toward the center of the first shuttle bus 11. Figure 6 is a cross-sectional view schematically showing the regions AR1 and AR2 including the contactor 16, illustrating a state in which one first inner conductor end 121 has been pulled out from inside the contactor 16.

[0043] First, the worker removes all conductors other than the first reciprocating busbar 11 from the instrument transformer device 1 (S1). Specifically, the worker removes all members other than the first connecting conductor 17 and the second connecting conductor 18, which are fixed to the first reciprocating busbar 11 by the first bolt 19 and the second bolt 20. Therefore, by step S1, the first reciprocating busbar 11 is not removed from the instrument transformer device 1, but remains inside the instrument transformer device 1, as shown in FIG.

[0044] Next, the worker removes the first bolt 19 that secures the first inner conductor 12 and the second bolt 20 that secures the central outer conductor 132 (S2). By removing the second bolt 20, the first inner conductor 12 can be moved in its axial direction. Furthermore, by removing the first bolt 19 and the second bolt 20, the central outer conductor 132 can be disassembled.

[0045] Next, the worker removes the bolts (not shown) that secure the end outer conductors 131 located at both ends of the first shuttle bus 11 to the connecting conductor 8 (S3). This allows each of the two end outer conductors 131 to move along the first inner conductor 12 to the center of the first shuttle bus 11.

[0046] Next, the worker moves each of the two end outer conductors 131 along the first inner conductor 12 toward the center of the first shuttle busbar 11 (S4; first moving step). By moving the end outer conductors 131 toward the center of the first shuttle busbar 11, the end outer conductors 131 protruding outside the instrument transformer 1 can be retracted into the instrument transformer 1 beyond the contactors 16, as shown in FIG.

[0047] Next, the worker moves the first inner conductor 12 in either the left or right direction to pull out the first inner conductor end 121 from inside one of the contactors 16 (S5; second movement step). In S5, the worker moves one of the contactors 16 in a direction to pull out the first inner conductor end 121 from inside the other of the contactors 16. As described above, the distance X is greater than the length Y. Therefore, this movement allows the first inner conductor end 121 to be pulled out from one of the contactors 16.

[0048] 6 shows an example of moving one of the contactors 16 in a direction in which the first inner conductor end 121 is pulled out from inside the contactor 16. As shown in FIG. 6, when the first inner conductor 12 is moved leftward, the first inner conductor 12 can be moved leftward by a distance X. Because the distance X is greater than the length Y, the first inner conductor end 121 is pulled out to the outside of the contactor 16 in the right-side region AR1 before the first inner conductor end 121 comes into contact with the second inner conductor end 311 in the left-side region AR2. When the first inner conductor 12 is moved rightward, the first inner conductor end 121 is also pulled out to the outside of the contactor 16 in the left-side region AR2.

[0049] Next, the worker pulls out the first inner conductor end 121 from inside the other contactor 16 (S6). In FIG. 6, the worker tilts the first inner conductor end 121, which has been pulled out from inside the contactor 16 in the right-side area AR1, toward the front of the instrument transformer 1, while moving the first inner conductor 12 to the right. As a result, the first inner conductor end 121 is also pulled out from inside the contactor 16 in the left-side area AR2. In this way, the worker can remove the first return busbar 11 from the instrument transformer 1.

[0050] Next, the worker removes the contact 16 and the positioning retaining ring 53 (S7; removal step). This allows the second inner conductor 31 to be moved toward the connecting conduit 6. Next, the worker moves the second inner conductor 31 toward the connecting conduit 6 and pulls out the second inner conductor end 311 to the outside of the instrument transformer 1 (S8; pull-out step). This allows the second inner conductor end 311 to fit into the accommodation space MR defined by the length M. In this way, the worker can remove the first return bus 11 from the instrument transformer 1 and eliminate the protrusion at the cut-out portion of the instrument transformer 1. The protrusion at the cut-out portion refers to the parts (contact 16, end outer conductor 131, and second inner conductor end 311) protruding from the outer wall of the instrument transformer 1.

[0051] Next, the worker moves only the instrument transformer 1 without moving the external devices that were electrically connected to the instrument transformer 1, namely, the connecting pipeline 6 and the gas-insulated switchgear 7 (S9; third moving step). This makes it possible to remove only the instrument transformer 1 toward the front without moving the connecting pipeline 6 and the gas-insulated switchgear 7.

[0052] [Comparison with Gas Insulated Switchgear 700] The gas insulated switchgear 100 will be described in comparison with the gas insulated switchgear 700. Fig. 7 is a side view schematically showing the gas insulated switchgear 700 as a comparative example, and is a diagram for explaining the removal of the first shuttle busbar 711.

[0053] Gas-insulated switchgear 700 includes instrument transformer 701, connecting pipeline 706, and gas-insulated switchgear 707. In gas-insulated switchgear 700, two gas-insulated switchgears 707 are arranged at positions facing each other with instrument transformer 701 at the center. Each of the two gas-insulated switchgears 707 is electrically connected to instrument transformer 701 via connecting pipeline 706.

[0054] The instrument transformer 701 is equipped with a first shuttle bus 711. The first shuttle bus 711 protrudes from the inside of the instrument transformer 701 towards the connecting pipeline 706. The gas-insulated switchgear 707 is equipped with a shuttle bus 771. The shuttle bus 771 also protrudes from the gas-insulated switchgear 707 towards the connecting pipeline 706. The connecting pipeline 706 is also equipped with a second shuttle bus (not shown). The first shuttle bus 711 and the shuttle bus 771 are electrically connected via the second shuttle bus.

[0055] When removing instrument transformer 701 for maintenance, etc., it is ideal to pull out only instrument transformer 701 toward you. However, because first return busbar 711 protrudes, it interferes with connecting pipe 706, making it impossible to pull out instrument transformer 701 toward you.

[0056] Furthermore, in instrument transformer 701, as in instrument transformer 1, the first inner conductor constituting first return bus 711 and the second inner conductor constituting second return bus are electrically connected via a contact. However, in instrument transformer 701, inside the contact, the distance X between the end of the first inner conductor and the end of the second inner conductor is less than or equal to the length Y of the portion of the first inner conductor inserted into the contact. Therefore, even if the first inner conductor is moved left or right, the end of the first inner conductor cannot be pulled out from inside the contact, and first return bus 711 cannot be removed from instrument transformer 701.

[0057] Therefore, to remove instrument transformer 701, for example, it is necessary to first move right-side gas-insulated switchgear 707 to the right, then move right-side connecting pipe 706 to the right, and then move instrument transformer 701 to the right. Alternatively, it is necessary to move right-side gas-insulated switchgear 707 to the right, then move right-side connecting pipe 706 to the right, and also move left-side gas-insulated switchgear 707 to the left, and then move left-side connecting pipe 706 to the left.

[0058] As described above, in gas-insulated switchgear 700, instrument transformer 701 cannot be removed independently, and it takes time and effort to remove gas-insulated switchgear 707 and connecting pipeline 706. Furthermore, when removing the gas-insulated switchgear 707 and connecting pipeline 706 as described above, a considerable amount of time and expense is required.

[0059] On the other hand, in the gas-insulated switchgear 100, the positional relationship between the first inner conductor 12 and the second inner conductor 31 is specified so that the distance X is greater than the length Y. Therefore, by moving the first inner conductor 12 and the end outer conductor 131 along the first shuttle bus 11, it is possible to remove the first shuttle bus 11 from the instrument transformer 1. Then, by moving the second inner conductor 31 toward the connecting pipeline 6, the second inner conductor end 311 can be accommodated in the accommodation space MR defined by the length M. Therefore, as described above, it is possible to remove only the instrument transformer 1 toward the front without moving the connecting pipeline 6 and the gas-insulated switchgear 7. This reduces the man-hours, effort, time, and cost required to remove the instrument transformer 1.

[0060] 〔summary〕 An instrument transformer device according to a first aspect of the present disclosure comprises an instrument transformer that transforms voltage and current; a first shuttle busbar electrically connected to the instrument transformer and having a first inner conductor and a first outer conductor positioned around the first inner conductor; and contactors positioned at each end of the first shuttle busbar and electrically connecting (1) the first inner conductor and (2) the second inner conductor in a second shuttle busbar having a second inner conductor and a second outer conductor positioned around the second inner conductor; when the first inner conductor and the second inner conductor are inserted and fixed inside the contactors, the distance between the end of the first inner conductor and the end of the second inner conductor inside the contactors is greater than the length of the portion of the first inner conductor inserted inside the contactors.

[0061] In the instrument transformer device according to aspect 2 of the present disclosure, in the above-mentioned aspect 1, the first shuttle busbar has a plurality of first outer conductors, and of the plurality of first outer conductors, the first outer conductors located at each end of the first shuttle busbar are installed so as to be movable toward the center of the first shuttle busbar when in an unfixed state.

[0062] The gas-insulated switchgear according to aspect 3 of the present disclosure comprises an instrument transformer according to aspect 1 or 2 above, the second shuttle bus, and a gas-insulated switchgear electrically connected to the instrument transformer via the first shuttle bus and the second shuttle bus.

[0063] The gas-insulated switchgear according to aspect 4 of the present disclosure is the same as in aspect 3 above, and comprises: a connecting pipe line having a portion of the second reciprocating bus bar therein and connecting the instrument transformer and the gas-insulated switchgear; a connecting conductor located between the instrument transformer and the connecting pipe line and electrically connecting the first outer conductor and the second outer conductor; an insulating spacer located between the instrument transformer and the connecting pipe line and insulating the electrical connection between an outer wall of the instrument transformer and an outer wall of the connecting pipe line and the connecting conductor, the insulating spacer having a convex portion on at least a portion of its surface facing the instrument transformer; and an adapter located between the instrument transformer and the insulating spacer and having an accommodating space capable of accommodating the convex portion, wherein the length of the accommodating space in the protruding direction of the convex portion is greater than the length of the protruding direction of the convex portion.

[0064] A removal method according to a fifth aspect of the present disclosure includes a first shuttle busbar electrically connected to an instrument transformer that transforms voltage and current and having a first inner conductor and a plurality of first outer conductors positioned around the first inner conductor, the first outer conductors positioned at both ends of the first shuttle busbar being moved along the first inner conductor toward the center of the first shuttle busbar; and a second shuttle busbar located at both ends of the first shuttle busbar and having (1) the first inner conductor and (2) a second inner conductor and a second outer conductor positioned around the second inner conductor, the second inner conductors being moved along the first inner conductor toward the center of the first shuttle busbar. and a second moving step of moving one of the contacts that electrically connects the first and second inner conductors in a direction of pulling out the end of the first inner conductor from inside the connector, wherein the second moving step pulls out the end of the first inner conductor from inside the contact by moving the first inner conductor a distance that is greater than the length of the portion of the first inner conductor inserted into the contact, and is between the end of the first inner conductor and the end of the second inner conductor inside the contact when the first inner conductor and the second inner conductor are inserted and fixed inside the contact.

[0065] A removal method according to aspect 6 of the present disclosure is the same as in aspect 5, and includes a removal step of removing the contactor from an instrument transformer device that includes the instrument transformer, the first return busbar, and the contactor, a drawing step of drawing the end of the second inner conductor out of the instrument transformer device, and a third moving step of moving only the instrument transformer device without moving an external device that was electrically connected to the instrument transformer device.

[0066] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. [Explanation of symbols]

[0067] 100 Gas-insulated switchgear 1 Instrument transformer 10. Instrument transformer 11 1st round trip busbar 12 First inner conductor 121 first inner conductor end (end of first inner conductor) 13 First outer conductor 131 End outer conductor (first outer conductor) 132 central outer conductor (first outer conductor) 16 Contacts 30 2nd round trip busbar 31 Second inner conductor 311 second inner conductor end (end of second inner conductor) 32 second outer conductor 4 Adapters 5 Insulating spacer 51 Convex part 6 Connecting pipes 7 Gas-insulated switchgear 8 Connecting conductor X is the distance between the first inner conductor end and the second inner conductor end Y Length of the first inner conductor inserted into the contact MR storage space M Length of the storage space L Length of the protruding part

Claims

1. an instrument transformer for transforming voltage and current; a first return busbar electrically connected to the instrument transformer and having a first inner conductor and a first outer conductor positioned around the first inner conductor; and contacts located at both ends of the first shuttle bus, electrically connecting (1) the first inner conductor and (2) the second inner conductor of a second shuttle bus having a second inner conductor and a second outer conductor located around the second inner conductor; an instrument transformer device, wherein when the first inner conductor and the second inner conductor are inserted into and fixed in the contactor, the distance between the end of the first inner conductor and the end of the second inner conductor inside the contactor is greater than the length of the portion of the first inner conductor inserted into the contactor.

2. the first return busbar includes a plurality of the first outer conductors; 2. The instrument transformer device according to claim 1, wherein, of the plurality of first outer conductors, the first outer conductors located at both ends of the first return bus are installed so as to be movable toward a center of the first return bus in an unfixed state.

3. The instrument transformer according to claim 1 or 2; the second shuttle bus; a gas-insulated switchgear electrically connected to the instrument transformer via the first and second return bus bars.

4. a connecting pipe line having a part of the second reciprocating bus bar therein and connecting the instrument transformer device and the gas-insulated switchgear; a connecting conductor located between the instrument transformer and the connecting pipe, electrically connecting the first outer conductor and the second outer conductor; an insulating spacer located between the instrument transformer and the connecting conduit, for insulating the electrical connection between the outer wall of the instrument transformer and the outer wall of the connecting conduit and the connecting conductor, the insulating spacer having a convex portion on at least a part of its surface facing the instrument transformer; an adapter positioned between the instrument transformer and the insulating spacer, the adapter having an accommodation space capable of accommodating the protrusion, The gas-insulated switchgear according to claim 3 , wherein a length of the accommodation space in a protruding direction of the convex portion is greater than a length of the convex portion in the protruding direction.

5. a first moving step of moving a first outer conductor located at each end of the first shuttle bus bar along the first inner conductor toward the center of the first shuttle bus bar, the first outer conductor being electrically connected to an instrument transformer that transforms voltage and current and having a first inner conductor and a plurality of first outer conductors located around the first inner conductor; a second moving step of moving one of the contacts located at each end of the first shuttle bus and electrically connecting (1) the first inner conductor and (2) the second inner conductor of a second shuttle bus having a second inner conductor and a second outer conductor located around the second inner conductor, in a direction to pull out an end of the first inner conductor from inside the contact, In the second moving step, the end of the first inner conductor is pulled out from inside the contactor by moving the first inner conductor a distance that is greater than the length of the inserted portion of the first inner conductor inside the contactor, the distance being between the end of the first inner conductor and the end of the second inner conductor inside the contactor when the first inner conductor and the second inner conductor are inserted and fixed inside the contactor.

6. a detaching step of detaching the contactor from an instrument transformer device including the instrument transformer, the first return busbar, and the contactor; a drawing step of drawing an end portion of the second inner conductor to the outside of the instrument transformer; 6. The method of claim 5, further comprising a third moving step of moving only the instrument transformer without moving an external device electrically connected to the instrument transformer.

Images