Solid insulated bus

Abstract

This solid insulated bus bar (100) is provided with: a bus bar (2) having a bus bar conductor (2a) and an insulating layer (2b) covering the periphery of the bus bar conductor (2a); an insulation adapter (1) that supports the bus bar (2); an insulation plug (4) which is arranged above the insulation adapter (1) in the vertical direction and is connected with the insulation adapter (1); and a bushing (3) provided below the insulation adapter (1) in the vertical direction so as to connect the insulation adapter (1) to the outside, the insulation plug (4) comprising an upper metal insert (4b) that is fitted and a conductive cover part (4d) that is in contact with a ground shield layer (1b) on the surface of the insulation adapter (1).

Description

Technical Field

[0001] The present application relates to a solid insulated busbar. Background Art

[0002] The gas-insulated switchgear utilizes the excellent insulation performance of SF6 gas to make the equipment compact, which helps to reduce the space of the electrical room. The gas-insulated switchgear stores the main circuit part that applies high voltage in a sealed container, and seals the SF6 gas with excellent insulation performance in the sealed container, thereby making the configuration of the main circuit equipment compact. In addition, in recent years, as an alternative to SF6 gas, gases that are relatively good in terms of environment, such as dry air, are sometimes used as substitute gases for sealing.

[0003] This type of gas insulated switchgear is constructed by arranging a plurality of partitions (counted as one surface) for accommodating one or more devices and connecting them with bus bars. Regarding the busbar portion, a gas busbar method is generally adopted in which adjacent busbar boxes are connected to each other and busbar conductors in the busbar boxes are connected when installing a gas insulated switchgear. In recent years, a gas insulated switchgear (for example, Patent Document 1) has been disclosed that eliminates on-site gas handling work during installation of a gas insulated switchgear by using a solid insulated busbar.

[0004] The solid insulated busbar is composed of a busbar of the main circuit connecting adjacent boards, and an insulating adapter provided to cover the connection between each board and the busbar, and the insulating adapter has a grounding shielding layer made of conductive paint etc. on its entire periphery. In the insulating adapter, a conductive rubber cap is installed on the upper part of the conical insulating plug after the installation work, which is used for shielding the electric field, grounding the leakage current, and preventing the mixing of foreign matter. Prior art literature Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2016-92883 Summary of the invention Technical problem to be solved by the invention

[0006] In the solid insulated busbar of Patent Document 1, a conductive rubber cap is used. Therefore, cracks may be generated due to deterioration after long-term use, and the surface pressure may decrease, so that leakage current may not be grounded.

[0007] The present application discloses a technology for solving the above-mentioned problems, and its purpose is to prevent the influence of long-term degradation on the electric field shielding function, the charge grounding function, and the foreign matter mixing prevention function. Technical means for solving technical problems

[0008] The solid insulated bus disclosed in the present application includes: a busbar having a busbar conductor and an insulating layer covering the busbar conductor; an insulating adapter supporting the busbar; an insulating plug arranged above the insulating adapter in a vertical direction and connected to the insulating adapter; and a bushing arranged below the insulating adapter in a vertical direction to connect the insulating adapter to the outside. In the solid insulated busbar, the insulating plug has an upper metal insert and a conductive cover, and the cover is in contact with a grounded shielding layer on the surface of the insulating adapter. Effects of the Invention

[0009] According to the solid insulated busbar disclosed in the present application, it is possible to prevent long-term degradation of the electric field shielding function, the charge grounding function, and the foreign matter mixing prevention function. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a cross-sectional view showing the structure of the solid insulated busbar according to the first embodiment. Figure 2 It is a cross-sectional view showing the structure of a comparative example of a solid insulated busbar. Figure 3 This is a cross-sectional view showing another structure of the solid insulated busbar according to the first embodiment. Figure 4 This is a cross-sectional view showing the structure of a solid insulated busbar according to the second embodiment. Figure 5A This is a cross-sectional view showing the structure of a solid insulated busbar according to the third embodiment. Figure 5B yes Figure 5A Partial detail diagram. Figure 6 This is a cross-sectional view showing the structure of a solid insulated busbar according to the fourth embodiment. DETAILED DESCRIPTION

[0011] Implementation method 1. Embodiment 1 relates to a solid insulated busbar, comprising: a busbar having a busbar conductor and an insulating layer covering the busbar conductor; an insulating adapter that supports the busbar; an insulating plug that is arranged above the insulating adapter in a vertical direction and connected to the insulating adapter; and a bushing that is arranged below the insulating adapter in a vertical direction to connect the insulating adapter to the outside, the insulating plug having a cover that is integrally constructed with an upper metal insert embedded in the insulating plug, and the cover is in contact with a ground shielding layer on the surface of the insulating adapter.

[0012] Hereinafter, regarding the solid insulated busbar according to the first embodiment, a cross-sectional view showing the structure of the solid insulated busbar will be described. Figure 1 , as a cross-sectional view showing the structure of a comparative example Figure 2and as cross-sectional views showing other configurations Figure 3 To explain. In addition, in each drawing, the same or corresponding parts are denoted by the same reference numerals, and repeated description is omitted.

[0013] based on Figure 1 The overall structure of the solid insulated busbar 100 according to the first embodiment will be described. The solid insulated busbar 100 of the first embodiment includes an insulating adapter 1, a busbar 2, a bushing 3, and an insulating plug 4 as main structural elements.

[0014] First, the overall function of the solid insulated busbar 100 and the relationship between the main components are described. In the description of the overall function, the reference numerals of components other than the main components are omitted for ease of understanding. The solid insulated busbar 100 is composed of a busbar 2 for connecting the main circuit of adjacent external boards and a detachable insulating adapter 1 provided to cover the connection between each board and the busbar 2. The insulating adapter 1 has a ground shield layer made of conductive paint or the like around its entire periphery.

[0015] A conical portion is provided vertically above the insulating adapter 1 to facilitate connection between the board main circuit and the busbar 2. After the board main circuit and the busbar 2 are connected, the insulating plug 4 is inserted to block the conical hole. The insulating plug 4 is a conical insulating object inserted into the insulating adapter 1 and is composed of an insulating layer such as epoxy resin and a metal insert such as copper or aluminum embedded in the insulating layer. With respect to the insulating adapter 1 , the cover of the insulating plug 4 plays the role of shielding the electric field, grounding the circulating current, and preventing the mixing of foreign matter after the main circuit part of the board and the busbar 2 are connected. In the solid insulated busbar 100, a high voltage is applied to the insulation adapter 1 and the conductor covered by the insulating object connecting them, so that charge is induced from the high voltage conductor to the surface of each insulating object. Therefore, the insulation adapter 1 and the surface of each insulating object need to be grounded.

[0016] Next, the functions, detailed structures, and materials of the main components of the solid insulated busbar 100 will be described. The insulating adapter 1 is composed of an insulating layer 1a, a ground shield layer 1b, and a conductive layer 1c. The insulating layer 1a is made of a relatively soft and elastic insulating material such as silicone rubber or ethylene propylene rubber, and insulates the charging portion (the busbar conductor 2a and the central conductor 3a) from the outside. The ground shield layer 1 b shields the electric field generated from the charging portion, and the conductive layer 1 c relaxes the electric field from the charging portion. The insulating adapter 1 has a T-shape, and has a tapered portion in the vertical direction and a cylindrical portion in the horizontal direction intersecting the tapered portion.

[0017] The bus bar 2 is composed of a bus bar conductor 2a and an insulating layer 2b. In the bus bar 2, the bus bar conductor 2a connecting the main circuit of the board is covered with an insulating layer 2b such as silicone rubber or epoxy resin.

[0018] The bushing 3 provided at the lower side in the vertical direction of the insulation adapter 1 is composed of a central conductor 3 a and an insulation layer 3 b . The bushing 3 is, for example, a busbar connection bushing of a gas insulated switchgear, and has a central conductor 3a connected to the main circuit of the board inside, and is covered with an insulating layer 3b such as epoxy resin. The insulating layer 3b is in a conical shape with a tapered front end. In addition, the bushing 3 is fixed to the box body (not shown) of the gas insulated switchgear by bolts.

[0019] Here, connection among the insulating adapter 1 , the busbar conductor 2 a of the busbar 2 , and the central conductor 3 a of the bushing 3 will be described. The central conductor 3a of the bushing 3 is internally threaded so as to fit with the stud 5, and the stud 5 is screwed into the central conductor 3a of the bushing 3 to fix the stud 5. With the fixing conductor 6 placed in the conductive layer 1c inside the insulating adapter 1, the insulating adapter 1 is inserted from the vertical upper side into the stud 5 and the bushing 3. The end of the busbar 2 is inserted into the horizontal cylindrical portion of the insulating adapter 1, the busbar conductor 2a is clamped by the fixing conductor 6, and the stud 5 and nut 7 are tightened to fix the insulating adapter 1 and the busbar 2. The fixing conductor 6 is used for conducting electricity between the busbar conductor 2a of the busbar 2 and the central conductor 3a of the bushing 3, and therefore, a metal with high conductivity such as copper or aluminum is used. In addition, the support conductor 8 is used so that the fixing conductor 6 and the busbar conductor 2a are in face-to-face contact when fastened.

[0020] The insulating plug 4 is composed of an insulating layer 4a, an upper metal insert 4b, a lower metal insert 4c, and a cover 4d. The upper part of the upper metal insert 4b is the cover 4d, and the upper metal insert 4b and the cover 4d are integrally constructed. The insulating plug 4 is formed by embedding an upper metal insert 4b and a lower metal insert 4c made of copper or aluminum into an insulating layer 4a made of epoxy resin or the like. The insulating layer 4a has a conical shape with a tapered tip. The lower metal insert 4c is internally threaded and is screwed to the stud bolt 5, so that the insulating plug 4 is fixed while ensuring a certain surface pressure. The bushing 3 and the insulating plug 4 are screwed into the vertical tapered portion of the insulating adapter 1 via grease, and are connected to the insulating adapter 1 while ensuring a certain surface pressure.

[0021] In the solid insulated busbar 100 of the first embodiment, the upper portion of the upper metal insert 4b embedded in the insulating plug 4 is shaped to cover the insulating layer 4a and to contact the ground shield layer 1b on the surface of the insulating adapter 1 while ensuring a sufficient current-carrying area, for example, a disc shape. The disc-shaped portion is set as the cover portion 4d. That is, the conductive cover 4d that closes the upper opening of the insulating adapter 1 is integrally structured with the upper insert 4b. In the solid insulating busbar 100 of embodiment 1, the cover 4d and the grounding shielding layer 1b are in contact to ensure the electrical conductivity. Therefore, if either the grounding wire 9A (connected to the grounding shielding layer 1b) or the grounding wire 9B (connected to the cover 4d) exists, the charge on the surface of the fixed insulating busbar 100 can flow through the ground.

[0022] Next, based on Figure 2 A solid insulated bus bar 100A of a comparative example will be described to clarify the features of the solid insulated bus bar 100 of Embodiment 1. In order to distinguish from the solid insulated bus bar 100, a solid insulated bus bar 100A and an insulating plug 4A are used. Figure 2 The solid insulated busbar 100A of the embodiment is different from the solid insulated busbar 100 of the first embodiment in the structure of the insulating plug 4A. The insulating plug 4A is composed of an insulating layer 4 a , an upper metal insert 4 b , a lower metal insert 4 c and a conductive cap 10 . The conductive cap 10 is mounted on the insulating adapter 1 for the purpose of shielding the electric field, grounding the circulating current, and preventing the entry of foreign matter after the connection work between the board main circuit and the busbar 2 . The conductive cap 10 and the insulating adapter 1 are constructed as follows: the inner diameter of the conductive cap 10 is smaller than the outer diameter of the insulating adapter 1, and the conductive cap 10 is covered on the insulating adapter 1, thereby generating surface pressure between the insulating adapter 1 and the conductive cap 10, making the contact reliable.

[0023] For ease of installation on the insulating adapter 1 , the conductive cap 10 is usually made of conductive rubber or conductive plastic. However, if rubber or plastic materials are used as described above, there are problems such as degradation due to changes in environmental temperature and humidity, creep deformation due to long-term application of surface pressure, and a decrease in surface pressure. If the surface pressure decreases, the contact between the conductive cap 10 and the insulating adapter 1 becomes unstable, and the conductive cap 10 of the insulating plug 4 becomes electrically floating, and the charge on the surface of the conductive cap 10 may not flow to the ground.

[0024] In the solid insulated busbar 100 of the first embodiment, the cover 4d of the insulating plug 4 is made of a metal conductive material such as copper or aluminum, and is in close contact with the ground shielding layer 1b on the surface of the insulating adapter 1. By using a metal conductive material for the cover 4d, the grounding function of the electric charge on the surface of the insulating object and the foreign matter mixing prevention function can be maintained. Therefore, the long-term degradation of the electric field shielding function, the grounding function of the electric charge on the surface of the insulating object, and the foreign matter mixing prevention function can be prevented.

[0025] Next, regarding the structure of the solid insulated busbar when the busbar 2 is connected to the insulating adapter 1 from both sides, based on Figure 3 In order to distinguish it from the solid insulated bus bar 100 , it is referred to as a solid insulated bus bar 101 . like Figure 3 As shown, when the busbars 2 are connected from both the left and right sides of the insulation adapter 1, the busbar 2 insertion sites are arranged on both the left and right sides, forming a cross shape as a whole.

[0026] The central conductor 3a of the bushing 3 is internally threaded so as to fit with the stud 5, and the stud 5 is screwed into the central conductor 3a of the bushing 3 to fix the stud 5. With the fixing conductor 6 placed in the conductive layer 1c inside the insulation adapter 1, the insulation adapter 1 is inserted from the vertical upper side into the stud 5 and the bushing 3. The ends of the busbar 2 are respectively inserted into the horizontal cylindrical portions on the left and right sides of the insulation adapter 1, and the busbar conductors 2a are clamped by the fixing conductor 6, and the stud 5 and the nut 7 are tightened to fix the insulation adapter 1 and the busbar 2. The fixing conductor 6 is responsible for conducting electricity between the busbar conductors 2 a of the two busbars 2 and the central conductor 3 a of the bushing 3 , and therefore, a metal having high conductivity such as copper or aluminum is used.

[0027] In the solid insulated busbar 100 of the first embodiment, it is assumed that the upper metal insert 4b and the cover 4d of the insulating plug 4 are integrally constructed and made of a metallic conductive material such as copper or aluminum. However, the same effect can be achieved by separating the upper metal insert 4b and the cover 4d and using a non-metallic conductive material for the cover 4d. That is, the insulating plug 4 may include an upper metal insert 4 b embedded in the insulating plug 4 and a conductive cover portion 4 d , and the cover portion 4 d is in contact with the ground shield layer 1 b on the surface of the insulating adapter 1 .

[0028] As described above, the solid insulated busbar of embodiment 1 includes: a busbar having a busbar conductor and an insulating layer covering the busbar conductor; an insulating adapter that supports the busbar; an insulating plug that is arranged above the insulating adapter in the vertical direction and is connected to the insulating adapter; and a bushing that is arranged below the insulating adapter in the vertical direction to connect the insulating adapter to the outside, the insulating plug having a cover that is integrally constructed with an upper metal insert embedded in the insulating plug, and the cover is in contact with a ground shielding layer on the surface of the insulating adapter. Therefore, the solid insulated busbar according to the first embodiment can prevent long-term degradation of the electric field shielding function, the charge grounding function, and the foreign matter mixing prevention function.

[0029] Implementation method 2. The solid insulated busbar of the second embodiment adopts a structure in which a bolt portion is added to the upper portion of the insulating plug so that the force of fastening to the insulating adapter can be managed, thereby improving assemblability.

[0030] Regarding the solid insulated busbar of the second embodiment, based on the cross-sectional view showing the structure of the solid insulated busbar, Figure 4 , the explanation will focus on the differences from Implementation 1. In the configuration diagram of the second embodiment, the same reference numerals are given to the same or corresponding parts as those of the first embodiment. In order to distinguish from the solid insulated bus bar 100 of the first embodiment, a solid insulated bus bar 200 and an insulating plug 4B are used.

[0031] The insulating plug 4B is composed of an insulating layer 4a, an upper metal insert 4b, a lower metal insert 4c, a cover 4d, and a bolt 4e. The bolt 4e is added to the upper part of the insulating plug 4, that is, the upper part of the cover 4d, and is assumed to be a hexagonal bolt, for example. The insulating plug 4B is formed by embedding an upper metal insert 4b and a lower metal insert 4c made of copper or aluminum into an insulating layer 4a made of epoxy resin or the like. The insulating layer 4a has a conical shape with a tapered tip. The lower metal insert 4c is internally threaded and is screwed to the stud bolt 5, so that the insulating plug 4B is fixed while ensuring a certain surface pressure. Bushing 3 and insulating plug 4B are screwed into the vertical tapered portion of insulating adapter 1 via grease, and are connected to insulating adapter 1 while ensuring a certain surface pressure.

[0032] In the solid insulated busbar 200 of the second embodiment, a bolt portion 4e is added to the upper portion of the insulating plug 4B compared to the solid insulated busbar 100 of the first embodiment. By tightening the bolt portion 4e with a torque wrench, the force of tightening the insulating plug 4B to the insulating adapter 1 can be managed. Therefore, in the solid insulated busbar 200 of the second embodiment, the assemblability can be improved compared to the solid insulated busbar 100 of the first embodiment. The other structures are the same as those of the solid insulated busbar 100 of the first embodiment, and thus the description thereof is omitted.

[0033] As described above, the solid insulated busbar according to the second embodiment adopts a structure in which a bolt portion is added to the upper portion of the insulating plug so that the force of fastening to the insulating adapter can be managed, thereby improving assemblability. Therefore, the solid insulated busbar of Embodiment 2 can prevent long-term degradation of the electric field shielding function, the charge grounding function, and the foreign matter mixing prevention function. In addition, the force of fastening to the insulating adapter can be managed, so the assembly property can be improved.

[0034] Implementation method 3. The solid insulated busbar of the third embodiment adopts a structure in which the cover is mounted by fixing bolts after the insulating layer, the upper metal insert and the lower metal insert in the insulating plug are inserted into the insulating adapter.

[0035] Regarding the solid insulated busbar of the third embodiment, based on the cross-sectional view showing the structure of the solid insulated busbar, Figure 5A ,as well as Figure 5A The partial cross-sectional view is Figure 5B , the explanation will focus on the differences from Implementation 1. In the configuration diagram of the third embodiment, the same reference numerals are given to the same or corresponding parts as those of the first embodiment. In order to distinguish from the solid insulated bus bar 100 of the first embodiment, a solid insulated bus bar 300 and an insulating plug 4C are used.

[0036] The insulating plug 4C is composed of an insulating layer 4a, an upper metal insert 4f, a lower metal insert 4c, a cover portion 4g, and fixing bolts 4h. Figure 5B The following is a method for fixing the cover 4g to the upper metal insert 4f using the fixing bolts 4h. The upper metal insert 4f is provided with internal threads that fit into the threads of the fixing bolts 4h. After the insulating layer 4a, the upper metal insert 4f, and the lower metal insert 4c of the insulating plug 4C excluding the cover 4g and the fixing bolts 4h are inserted into the insulating adapter 1, the cover 4g is fixed to the upper metal insert 4f by the fixing bolts 4h. As a result, the cover 4g of the insulating plug 4C is in close contact with the ground shield layer 1b of the insulating adapter 1.

[0037] The insulating layer 4a has a conical shape with a tapered tip. The lower metal insert 4c is internally threaded and screwed to the stud bolt 5, so that the insulating plug 4C is fixed while ensuring a certain surface pressure. Bushing 3 and insulating plug 4C are screwed into the vertical tapered portion of insulating adapter 1 via grease, and are connected to insulating adapter 1 while ensuring a certain surface pressure.

[0038] Next, the structural features of the solid insulated bus bar 300 according to the third embodiment will be described. In the first embodiment, the insulating plug 4 is inserted into the insulating adapter 1 while rotating, so that the insulating layer 4a of the insulating plug 4C and the insulating layer 1a and the ground shield layer 1b of the insulating adapter 1 may be twisted, and the insulating layer 1a and the ground shield layer 1b may be worn. In the third embodiment, the upper metal insert 4f is internally threaded so that after the insulating layer 4a of the insulating plug 4C, the upper metal insert 4f, and the lower metal insert 4c are inserted into the insulating adapter 1, the cover 4g can be fixed to the upper metal insert 4f by the fixing bolts 4h. The other structures are the same as those in Embodiment 1, and thus the description thereof is omitted.

[0039] As described above, the solid insulated busbar according to the third embodiment has a structure in which the cover is attached by fixing bolts after the insulating layer, the upper metal insert, and the lower metal insert in the insulating plug are inserted into the insulating adapter. Therefore, the solid insulated busbar of Embodiment 3 can prevent long-term degradation of the electric field shielding function, the charge grounding function, and the foreign matter mixing prevention function. In addition, the torsion and wear between the insulating plug and the insulating layer of the insulating adapter can be eliminated.

[0040] Implementation method 4. The solid insulated busbar of the fourth embodiment adopts a structure in which the cover portion is formed after the insulating layer, the upper metal insert, and the lower metal insert in the insulating plug are inserted into the insulating adapter.

[0041] Regarding the solid insulated busbar of the fourth embodiment, based on the cross-sectional view showing the structure of the solid insulated busbar, Figure 6 , the explanation will focus on the differences from Implementation 1. In the configuration diagram of the fourth embodiment, the same reference numerals are given to the same or corresponding parts as those of the first embodiment. In order to distinguish from the solid insulated bus bar 100 of the first embodiment, a solid insulated bus bar 400 and an insulating plug 4D are used.

[0042] The insulating plug 4D is composed of an insulating layer 4a, an upper metal insert 4b, a lower metal insert 4c, and a cover portion 4j. The insulating plug 4D (excluding the cover portion 4j) is formed by embedding an upper metal insert 4b and a lower metal insert 4c made of copper or aluminum into an insulating layer 4a made of epoxy resin or the like. The insulating layer 4a has a conical shape with a tapered tip. The lower metal insert 4c is internally threaded and is screwed to the stud bolt 5, so that the insulating plug 4D is fixed while ensuring a certain surface pressure. Bushing 3 and insulating plug 4D (excluding cover portion 4j) are screwed into the vertical tapered portion of insulating adapter 1 via grease, and are connected to insulating adapter 1 while ensuring a certain surface pressure. After the insulating layer 4a, the upper metal insert 4b, and the lower metal insert 4c of the insulating plug 4D (excluding the cover 4j) are inserted into the insulating adapter 1, the cover 4j of the insulating plug 4D is formed by applying a conductive coating by spraying or the like. That is, the cover 4j is arranged on the uppermost surface of the insulating plug 4D in the vertical direction.

[0043] In the solid insulated busbar 400 of the fourth embodiment, it is assumed that the insulating adapter 1 includes the ground shield layer 1b, similarly to the first embodiment. That is, after the insulating layer 4a, the upper metal insert 4b, and the lower metal insert 4c of the insulating plug 4D excluding the cover 4j are inserted into the insulating adapter 1, the cover 4j of the insulating plug 4D is formed by applying a conductive coating by spraying or the like. Therefore, in the solid insulated busbar 400 of embodiment 4, the ground shielding layer 1b of the insulating adapter 1 and the cover 4j of the insulating plug 4D are entirely covered with a conductive coating, rather than being a connection structure based on surface pressure. Therefore, poor contact caused by a drop in surface pressure will not occur.

[0044] Usually, after the insulation adapter 1 is molded, a conductive paint is applied to the surface of the insulation adapter 1 to form the ground shield layer 1b. However, after the insulation plug 4 is inserted into the insulation adapter 1, a conductive paint is applied to the surface of the insulation layer 1a of the insulation adapter 1 and the surface of the insulation plug 4 by spraying or the like, so that the ground shield layer 1b of the insulation adapter 1 and the cover portion 4j of the insulation plug 4D can be formed on the entire surface of the insulation adapter 1 and the insulation plug 4. The other structures are the same as those of the solid insulated busbar 100 of the first embodiment, and thus the description thereof is omitted.

[0045] As described above, the solid insulated busbar according to the fourth embodiment has a structure in which the cover portion is formed after the insulating layer, the upper metal insert, and the lower metal insert in the insulating plug are inserted into the insulating adapter. Therefore, the solid insulated busbar of the fourth embodiment can prevent the long-term degradation of the electric field shielding function, the charge grounding function, and the foreign matter mixing prevention function. In addition, there is an effect that poor contact caused by the decrease in the surface pressure of the cover portion does not occur.

[0046] The present application describes various exemplary embodiments and examples, but various features, forms, and functions described in one or more embodiments are not limited to application in specific embodiments and can be applied to the embodiments alone or in various combinations. Therefore, numerous modifications not shown in the examples are conceivable within the technical scope disclosed in the present application, including, for example, the case where at least one component is modified, added or omitted, and the case where at least one component is extracted and combined with components of other embodiments. Description of symbols

[0047] 1 Insulation adapter 1a Insulation layer 1b Ground shield 1c Conductive layer 2 Busbar 2a Busbar conductor 2b Insulation layer 3 Bushing 3a Center conductor 3b Insulation layer 4, 4A, 4B, 4C, 4D insulation plug 4a Insulation layer 4b, 4f upper metal inserts 4c lower metal insert 4d, 4g, 4j cover 4e Bolt 4h Fixing bolt 5 Stud bolts 6 Fixed conductor 7 Nut 8 Support conductor 9A, 9B ground wire 10 Conductive cap 100, 100A, 101, 200, 300, 400 solid insulated busbars.

Claims

1. A solid insulated busbar, comprising: A busbar having a busbar conductor and an insulating layer covering a periphery of the busbar conductor; an insulating adapter supporting the busbar; An insulating plug, which is arranged above the insulating adapter in the vertical direction and connected to the insulating adapter; and a bushing, which is arranged below the insulating adapter in the vertical direction to connect the insulating adapter to the outside, wherein the solid insulating busbar is characterized in that: The insulating plug includes an upper metal insert and a conductive cover portion, wherein the cover portion contacts a ground shielding layer on a surface of the insulating adapter.

2. The solid insulated busbar according to claim 1, characterized in that: The upper metal insert and the cover are integrally constructed.

3. The solid insulated busbar according to claim 2, characterized in that: A bolt portion for fastening the insulation plug to the insulation adapter is provided on an upper portion of the cover portion.

4. The solid insulated busbar according to claim 1, characterized in that: As a structure capable of separating the upper metal insert and the cover portion, fixing bolts for fastening the cover portion and the upper metal insert are provided.

5. The solid insulated busbar according to claim 1, characterized in that: The cover portion is arranged on the uppermost surface of the insulating plug in the vertical direction.

6. The solid insulated busbar according to claim 5, characterized in that: The cover is formed by spray coating.

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