Direct-current confluence switch equipment for energy storage

Abstract

The utility model relates to the technical field of novel building power systems with light storage, direct current and flexibility, in particular to direct current confluence switch equipment for energy storage, which comprises an equipment framework, the surface of which is provided with a top cover, a cabinet rear sealing plate, a side sealing plate, a channel steel welding base, a section bar upright post, a section bar cross beam, a longitudinal tie bar and a longitudinal beam, and the surface of the profile cross beam is connected with an upper edge through a bolt. According to the utility model, green power generation direct-current confluence input is realized through the direct-current switch system and is input to a power grid through the inverter and the transformer, so that grid connection of energy storage and new energy power generation is completed; equipment system control is realized through a secondary control system; through an electric shock protection system, reliable grounding is completed, and safe operation of the system is ensured; the direct-current main switch is protected through the two-layer door system, the direct-current main switch is prevented from being in contact with an electrified body, and maintenance safety is guaranteed; and internal heat dissipation of the equipment is achieved through the active air cooling system, and operation safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of a new type of "photovoltaic storage direct current and flexible" building power system, in particular to a direct current bus switch device for energy storage. Background Art

[0002] DC busbar switchgear is a device used in power systems to bring together currents from different directions, and then further transmit and distribute them through the busbar switchgear. Busbar switchgear plays a vital role in power systems.

[0003] During the use of the busbar switch device, a large amount of current will flow through the device, but the existing busbar switch device will generate a large amount of heat during use, and its heat dissipation effect is poor. The device gathers a large amount of electrical energy, and the device itself has safety hazards. The safety of the user cannot be protected, which violates the dual carbon strategy and green energy strategy concepts. Utility Model Content

[0004] The purpose of the utility model is to provide a DC bus switch device for energy storage, so as to solve the problem that the bus switch device proposed in the above background technology will generate a large amount of heat during use, its heat dissipation effect is poor, and the device gathers a large amount of electrical energy. The device itself has safety hazards, the safety of the user cannot be protected, and it violates the dual carbon strategy and green energy strategy concepts.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a DC bus switch device for energy storage, comprising a device frame, the surface of which is provided with a top cover, a cabinet rear cover plate, a side cover plate, a channel steel welded base, a profile column, a profile beam, longitudinal tie bars and a longitudinal beam, the surface of the profile beam is connected with an upper edge by bolts, the surface of the device frame is movably connected with a front cabinet door, the surface of the front cabinet door is provided with a nameplate, a conversion switch, a door lock, a hinge, an indicator light and a signboard, the surface of the channel steel welded base is fixedly connected with a lower edge, the surface of the upper edge is provided with a use mark, the surface of the device frame is installed with a cabinet bottom plate, the surface of the cabinet bottom plate is provided with a primary line cable hole and a secondary line cable hole, the surface of the side cover plate is provided with a fan and a fan filter, the interior of the device frame is provided with an installation partition, the installation partition is connected with a guide rail, a grounding PE row and a mounting bracket by bolts, the surface of the guide rail is snap-connected with a miniature circuit breaker, Control circuit, secondary wiring terminal and limit plate, threaded holes are opened on the surface of the grounding PE row, the surface of the profile column is connected with a second-layer door by bolts, the surface of the second-layer door is snap-connected with a DC switch protection ring, the surface of the longitudinal tie bar is connected with a switch mounting support, an auxiliary mounting column, an incoming line insulator support and an outgoing line insulator support by bolts, the surface of the switch mounting support is connected with a DC switch by bolts, the surface of the DC switch is fixedly connected with the positive pole of the switch incoming line terminal, the positive pole of the switch outgoing line terminal, the negative pole of the switch outgoing line terminal, the negative pole of the switch incoming line terminal, the negative pole of the switch short-circuit and the positive pole of the switch short-circuit, the surface of the incoming line insulator support is connected with the incoming line insulator by bolts, the surface of the outgoing line insulator support is connected with the outgoing line insulator by bolts, the surface of the incoming line insulator is connected with the incoming line busbar positive pole and the incoming line busbar negative pole by bolts, and the surface of the outgoing line insulator is connected with the outgoing line busbar positive pole and the outgoing line busbar negative pole by bolts.

[0006] Preferably, four groups of hinges are provided, and the four groups of hinges are installed on the surface of the front cabinet door. Two groups of primary cable holes, secondary cable holes and side sealing plates are provided. The size of the primary cable hole is larger than the size of the secondary cable hole. Two groups of side sealing plates are provided. The two groups of side sealing plates are inserted into the frames on both sides of the cabinet and are connected and tightened with the profile columns and the vertically arranged longitudinal beams by bolts. The rear sealing plate of the cabinet is inserted into the rear cabinet frame and is connected and tightened with the profile columns and the vertically arranged profile cross beams by bolts.

[0007] Preferably, the two sides of the mounting partition are fixedly connected to the surface of the side sealing plate, three groups of mounting brackets are provided, and the two ends of the three groups of mounting brackets are connected to the surface of the auxiliary mounting columns by bolts, and two groups of switch mounting supports are provided, and the two ends of the two groups of switch mounting supports are fixedly connected to the surface of the longitudinal reinforcement by bolts.

[0008] Preferably, the size of the positive pole of the switch input terminal is the same as the size of the negative pole of the switch input terminal, the size of the positive pole of the switch output terminal is the same as the size of the negative pole of the switch output terminal, the positive pole of the input busbar is installed on the surface of the positive pole of the switch input terminal, the positive pole of the output busbar is installed on the surface of the positive pole of the switch output terminal, the negative pole of the input busbar is installed on the surface of the negative pole of the switch output terminal, and the negative pole of the output busbar is installed on the surface of the negative pole of the switch input terminal.

[0009] Preferably, two groups of the switch short-circuiting negative pole and the switch short-circuiting positive pole are provided, and the two groups of the switch short-circuiting negative pole and the switch short-circuiting positive pole are arranged on both sides of the DC switch, and the length of the auxiliary installation column is less than the length of the profile column.

[0010] Preferably, the profile cross beams, longitudinal beams and profile columns are arranged in two groups, the two groups of the profile cross beams are arranged on the front and rear sides of the equipment frame, the two groups of the longitudinal beams are arranged on the left and right sides of the equipment frame, and the two groups of the profile columns are arranged around the front and rear sides of the equipment frame. The number of the profile cross beams in each group is two, the number of the longitudinal beams in each group is two, and the number of the profile columns is four. The two ends of the profile cross beams and the longitudinal beams are respectively installed on the side surfaces of the profile columns.

[0011] Preferably, the longitudinal tensioning bars are arranged in seven groups in the shape of long rods, the incoming line insulator supports and the outgoing line insulator supports are arranged in two groups, the number of the incoming line insulator supports and the outgoing line insulator supports in each group is two, and the two groups of the incoming line insulator supports and the outgoing line insulator supports are arranged on both sides of the DC switch.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. Through the DC switch system, the green power generation DC convergence input is realized, and it is input into the power grid through inverters and transformers to complete the grid connection of energy storage and new energy power generation; through the secondary control system, the equipment system control is realized; through the electric shock protection system, reliable grounding is completed to ensure the safe operation of the system; through the two-layer door system, the DC main switch is protected to avoid contact with live parts and ensure maintenance safety; through the active air cooling system, the internal heat dissipation of the equipment is solved, which improves the operation safety. This technology is the latest supporting product designed for photovoltaic power generation, wind power generation and energy storage in conjunction with the implementation of the national dual-carbon strategy and green energy strategy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a front view stereoscopic schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a schematic diagram of a top-down perspective cross-sectional view of the structure of the utility model;

[0016] Figure 3It is a left-side perspective schematic diagram of the structure of the utility model;

[0017] Figure 4 It is a first frontal stereoscopic cross-sectional schematic diagram of the utility model;

[0018] Figure 5 It is a second front perspective cross-sectional schematic diagram of the utility model;

[0019] Figure 6 It is a left-side perspective cross-sectional schematic diagram of the structure of the utility model;

[0020] Figure 7 For this utility model Figure 4 Schematic diagram of the enlarged structure at point A in the middle.

[0021] In the figure: 1. Equipment frame; 2. Top cover; 3. Upper edge; 4. Nameplate; 5. Front cabinet door; 6. Conversion switch; 7. Door lock; 8. Lower edge; 9. Use identification; 10. Hinge; 11. Indicator light; 12. Identification plate; 13. Primary cable hole; 14. Secondary cable hole; 15. Cabinet rear cover; 16. Side cover; 17. Fan; 18. Fan filter; 19. Channel steel welding base; 20. Miniature circuit breaker; 201. Guide rail; 202. Limiting piece; 21. Control circuit; 22. Secondary wiring terminal; 23. Grounding PE bar; 231. Threaded hole; 24. Second-layer door; 25. DC switch protection ring; 26. Installation Partition; 27. Mounting bracket; 28. Switch mounting support; 29. ​​DC switch; 30. Switch incoming terminal positive pole; 31. Switch outgoing terminal positive pole; 32. Incoming busbar positive pole; 33. Outgoing busbar positive pole; 34. Incoming busbar negative pole; 35. Outgoing busbar negative pole; 36. Incoming insulator; 37. Outgoing insulator; 38. Switch outgoing terminal negative pole; 39. Switch incoming terminal negative pole; 40. Switch short-circuit negative pole; 41. Switch short-circuit positive pole; 42. Auxiliary mounting column; 43. Profile column; 44. Profile beam; 45. Longitudinal tie bar; 46. Incoming insulator support; 47. Outgoing insulator support; 48. Longitudinal beam. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-7 , an embodiment provided by the utility model:

[0024] A DC bus switch device for energy storage includes an equipment frame 1, the surface of the equipment frame 1 is provided with a top cover 2, a cabinet rear cover plate 15, a side cover plate 16, a channel steel welded base 19, a profile column 43, a profile beam 44, a longitudinal tie bar 45 and a longitudinal beam 48, the surface of the profile beam 44 is connected with an upper edge 3 by bolts, the surface of the equipment frame 1 is movably connected with a front cabinet door 5, the surface of the front cabinet door 5 is provided with a nameplate 4, a conversion switch 6, a door lock 7, a hinge 10, an indicator light 11 and a sign 12, the surface of the channel steel welded base 19 is fixedly connected with a lower edge 8, the surface of the upper edge 3 is provided with a use mark 9, the surface of the equipment frame is installed with a cabinet bottom plate, and the surface of the cabinet bottom plate is provided with a The side sealing plate 16 is provided with a fan 17 and a fan filter 18 on the surface of the side sealing plate 16. The interior of the equipment skeleton 1 is provided with a mounting partition 26. The mounting partition 26 is connected with a guide rail 201, a grounding PE row 23 and a mounting bracket 27 by bolts. The surface of the guide rail 201 is connected with a miniature circuit breaker 20, a control circuit 21, a secondary wiring terminal 22 and a limit piece 202. The surface of the grounding PE row 23 is provided with a threaded hole 231. The surface of the profile column 43 is connected with a second-layer door 24 by bolts. The surface of the second-layer door 24 is connected with a DC switch protection ring 25. The surface of the longitudinal tie rod 45 is connected with a switch mounting support 28 by bolts. , auxiliary installation columns 42, incoming line insulator supports 46 and outgoing line insulator supports 47, the surface of the switch mounting support 28 is connected with a DC switch 29 by bolts, the surface of the DC switch 29 is fixedly connected with the switch incoming line terminal positive pole 30, the switch outgoing line terminal positive pole 31, the switch outgoing line terminal negative pole 38, the switch incoming line terminal negative pole 39, the switch shorting negative pole 40 and the switch shorting positive pole 41, the surface of the incoming line insulator support 46 is connected with the incoming line insulator 36 by bolts, the surface of the outgoing line insulator support 47 is connected with the outgoing line insulator 37 by bolts, the surface of the incoming line insulator 36 is connected with the incoming line busbar positive pole 32 and the incoming line busbar negative pole 34 by bolts, the outgoing line insulator The surface of the sub 37 is connected with the positive pole 33 of the outgoing busbar and the negative pole 35 of the outgoing busbar by bolts. The profile is provided with universal modular holes. The end faces of the profile crossbeam 44 and the longitudinal beam 48 are connected and tightened with the profile column 43 by bolts. The nameplate 4 and the identification plate 12 are riveted to the front cabinet door 5, and the door lock 7 and the indicator light 11 are installed on the front cabinet door 5; the use identification 9 is laser printed on the upper edge 3, and the upper edge 3 is fastened to the profile crossbeam 44 of the equipment skeleton 1 by bolts, and the lower edge 8 is fastened to the channel steel welding base 19 of the equipment skeleton 1 by bolts to form a cabinet frame, and the fan 17 and the fan filter 18 are both mounted on the side sealing plate 16 to form a convection channel for air intake from the bottom and exhaust from the top.

[0025] Further, four groups of hinges 10 are provided, and the four groups of hinges 10 are installed on the surface of the front cabinet door 5. Two groups of primary cable holes 13, secondary cable holes 14 and side sealing plates 16 are provided, and the size of the primary cable hole 13 is larger than the size of the secondary cable hole 14; the equipment frame 1 is respectively provided with front and rear groups of profile beams 44, left and right groups of longitudinal beams 48, and left and right groups of profile columns 43. Two groups of side sealing plates 16 are provided, and the two groups of side sealing plates 16 are inserted into the frames on both sides of the cabinet and are connected with the profiles by bolts. The cabinet rear cover plate 15 is inserted into the rear cabinet frame and is connected and tightened with the cabinet rear profile column 43 and the profile cross beam 44 arranged up and down by bolts. The surface of the channel steel welding base 19 is provided with mounting holes. The equipment frame 1 is covered on the channel steel welding base 19 and is connected and tightened by bolts. The base channel steel opening faces outward for easy lifting and unloading. The front cabinet door 5 is connected to the profile column 43 on the right side of the equipment frame 1 by a hinge 10 to realize the right-opening function.

[0026] Furthermore, both sides of the mounting partition 26 are fixedly connected to the surface of the side sealing plate 16, three groups of mounting brackets 27 are provided, and both ends of the three groups of mounting brackets 27 are connected to the surface of the auxiliary mounting column 42 by bolts, two groups of switch mounting supports 28 are provided, and both ends of the two groups of switch mounting supports 28 are fixedly connected to the surface of the longitudinal tensioning rod 45 by bolts, the end face of the mounting bracket 27 is connected and tightened to the auxiliary mounting column 42 by bolts, and the mounting partition 26 covers the surface of the mounting bracket 27 and is tightened thereto by bolts.

[0027] Furthermore, the size of the positive pole 30 of the switch incoming terminal is the same as the size of the negative pole 39 of the switch incoming terminal, the size of the positive pole 31 of the switch outgoing terminal is the same as the size of the negative pole 38 of the switch outgoing terminal, the positive pole 32 of the incoming busbar is installed on the surface of the positive pole 30 of the switch incoming terminal, the positive pole 33 of the outgoing busbar is installed on the surface of the positive pole 31 of the switch outgoing terminal, the negative pole 34 of the incoming busbar is installed on the surface of the negative pole 38 of the switch outgoing terminal, and the negative pole 35 of the outgoing busbar is installed on the surface of the negative pole 39 of the switch incoming terminal. The positive pole 32 of the incoming busbar and the negative pole 34 of the incoming busbar are respectively fixed to the incoming insulator 36 by bolts; the positive pole 33 of the outgoing busbar and the negative pole 35 of the outgoing busbar are respectively fixed to the outgoing insulator 37 by bolts.

[0028] Furthermore, two groups of switch short-circuiting negative poles 40 and switch short-circuiting positive poles 41 are provided, and the two groups of switch short-circuiting negative poles 40 and switch short-circuiting positive poles 41 are provided on both sides of the DC switch 29. The length of the auxiliary mounting column 42 is less than the length of the profile column 43. The second-floor door 24 is fastened to the left and right profile columns 43 of the equipment frame 1 by bolts.

[0029] Furthermore, two groups of profile cross beams 44, longitudinal beams 48 and profile columns 43 are provided. The two groups of profile cross beams 44 are provided on the front and rear sides of the equipment skeleton 1, the two groups of longitudinal beams 48 are provided on the left and right sides of the equipment skeleton 1, and the two groups of profile columns 43 are provided around the front and rear sides of the equipment skeleton 1. The number of profile cross beams 44 in each group is two, the number of longitudinal beams 48 in each group is two, and the number of profile columns 43 is four. The two ends of the profile cross beams 44 and the longitudinal beams 48 are respectively installed on the side surfaces of the profile columns 43.

[0030] Furthermore, seven groups of longitudinal tie bars 45 are arranged in the shape of long rods, and two groups of incoming insulator supports 46 and outgoing insulator supports 47 are arranged. The number of each group of incoming insulator supports 46 and outgoing insulator supports 47 is two. The two groups of incoming insulator supports 46 and outgoing insulator supports 47 are arranged on both sides of the DC switch 29. The longitudinal tie bars 45 are connected and tightened to the profile columns 43 by bolts, and the incoming insulator supports 46 and outgoing insulator supports 47 are bridged on the longitudinal tie bars 45 by bolts.

[0031] Working principle: first, the mounting bracket 27, the switch mounting support 28, the auxiliary mounting column 42, the profile column 43, the profile beam 44 and the longitudinal tie rod 45 are connected to form a frame by bolts inside the equipment skeleton 1, and the guide rail 201, the grounding PE row 23 and the mounting bracket 27 are installed on the surface of the mounting partition 26 by bolts, so that the miniature circuit breaker 20, the control circuit 21, the secondary terminal 22 and the limit plate 202 are connected to the guide rail 201 by snapping, and then the DC switch 29 is connected to the switch mounting support 28 by bolts, and the corresponding positive and negative poles are connected. After completion, the front cabinet door 5 is closed by the hinge 10, so that the door lock 7 plays a locking role. By controlling the conversion switch 6, the machine works normally, and the fan 17 and the fan filter 18 are started.

[0032] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A DC bus switch device for energy storage, comprising a device frame (1), characterized in that: The surface of the equipment frame (1) is provided with a top cover (2), a cabinet rear cover plate (15), a side cover plate (16), a channel steel welded base (19), a profile column (43), a profile cross beam (44), longitudinal tie bars (45) and a longitudinal beam (48); the surface of the profile cross beam (44) is connected with an upper edge (3) by bolts; the surface of the equipment frame (1) is movably connected with a front cabinet door (5); the surface of the front cabinet door (5) is provided with a nameplate (4), a conversion switch (6), a door lock (7), a hinge (10), an indicator light (11) and a signboard (12); the surface of the channel steel welded base (19) is fixedly connected with a lower edge (8); The surface of the upper edge (3) is provided with a use mark (9); the surface of the equipment frame (1) is provided with a cabinet bottom plate; the surface of the cabinet bottom plate is provided with a primary cable hole (13) and a secondary cable hole (14); the surface of the side sealing plate (16) is provided with a fan (17) and a fan filter (18); an installation partition (26) is provided inside the equipment frame (1); the installation partition (26) is connected to a guide rail (201), a grounding PE bar (23) and a mounting bracket (27) by bolts; the surface of the guide rail (201) is connected with a miniature circuit breaker (20), a control circuit (21) and a secondary wiring terminal (22) by snap-fitting. and a limit plate (202), a threaded hole (231) is provided on the surface of the grounding PE row (23), a second-layer door (24) is connected to the surface of the profile column (43) by bolts, a DC switch protection ring (25) is snap-connected to the surface of the second-layer door (24), a switch mounting support (28), an auxiliary mounting column (42), an incoming line insulator support (46) and an outgoing line insulator support (47) are connected to the surface of the longitudinal tie bar (45) by bolts, a DC switch (29) is connected to the surface of the switch mounting support (28) by bolts, and a switch incoming line terminal positive electrode ( 30), a positive pole (31) of a switch outlet terminal, a negative pole (38) of a switch outlet terminal, a negative pole (39) of a switch inlet terminal, a negative pole (40) of a switch short-circuit, and a positive pole (41) of a switch short-circuit; the surface of the inlet insulator support (46) is connected to the inlet insulator (36) by bolts; the surface of the outlet insulator support (47) is connected to the outlet insulator (37) by bolts; the surface of the inlet insulator (36) is connected to the positive pole (32) of an inlet busbar and the negative pole (34) of an inlet busbar by bolts; the surface of the outlet insulator (37) is connected to the positive pole (33) of an outlet busbar and the negative pole (35) of an outlet busbar by bolts.

2. A DC bus switch device for energy storage according to claim 1, characterized in that: The hinges (10) are provided in four groups, and the four groups of hinges (10) are installed on the surface of the front cabinet door (5). The primary cable holes (13), the secondary cable holes (14) and the side sealing plates (16) are provided in two groups, and the size of the primary cable holes (13) is larger than the size of the secondary cable holes (14). The side sealing plates (16) are provided in two groups, and the two groups of side sealing plates (16) are inserted into the cabinet frame on both sides and are connected and tightened with the profile columns (43) and the longitudinal beams (48) arranged up and down by bolts. The cabinet rear sealing plate (15) is inserted into the cabinet frame at the rear and is connected and tightened with the cabinet rear profile columns (43) and the profile cross beams (44) arranged up and down by bolts.

3. The DC bus switch device for energy storage according to claim 1, characterized in that: The two sides of the mounting partition (26) are fixedly connected to the surface of the side sealing plate (16), three groups of mounting brackets (27) are provided, and the two ends of the three groups of mounting brackets (27) are connected to the surface of the auxiliary mounting column (42) by bolts, and two groups of switch mounting supports (28) are provided, and the two ends of the two groups of switch mounting supports (28) are fixedly connected to the surface of the longitudinal tie rod (45) by bolts.

4. The DC bus switch device for energy storage according to claim 1, characterized in that: The size of the positive electrode (30) of the switch incoming terminal is the same as the size of the negative electrode (39) of the switch incoming terminal, the size of the positive electrode (31) of the switch outgoing terminal is the same as the size of the negative electrode (38) of the switch outgoing terminal, the positive electrode (32) of the incoming busbar is installed on the surface of the positive electrode (30) of the switch incoming terminal, the positive electrode (33) of the outgoing busbar is installed on the surface of the positive electrode (31) of the switch outgoing terminal, the negative electrode (34) of the incoming busbar is installed on the surface of the negative electrode (38) of the switch outgoing terminal, and the negative electrode (35) of the outgoing busbar is installed on the surface of the negative electrode (39) of the switch incoming terminal.

5. The DC bus switch device for energy storage according to claim 1, characterized in that: The switch short-circuit negative pole (40) and the switch short-circuit positive pole (41) are provided in two groups, and the two groups of the switch short-circuit negative pole (40) and the switch short-circuit positive pole (41) are provided on both sides of the DC switch (29), and the length of the auxiliary installation column (42) is less than the length of the profile column (43).

6. The DC bus switch device for energy storage according to claim 1, characterized in that: The cross beams (44), longitudinal beams (48) and profile columns (43) are provided in two groups. The two groups of cross beams (44) are provided on the front and rear sides of the equipment frame (1), the two groups of longitudinal beams (48) are provided on the left and right sides of the equipment frame (1), and the two groups of profile columns (43) are provided around the front and rear sides of the equipment frame (1). The number of cross beams (44) in each group is two, the number of longitudinal beams (48) in each group is two, and the number of profile columns (43) is four. The two ends of the cross beams (44) and longitudinal beams (48) are respectively installed on the side surfaces of the profile columns (43).

7. The DC bus switch device for energy storage according to claim 1, characterized in that: The longitudinal tensioning bars (45) are arranged in seven groups in the shape of long rods, and the incoming line insulator supports (46) and the outgoing line insulator supports (47) are arranged in two groups, each group of the incoming line insulator supports (46) and the outgoing line insulator supports (47) has two in number, and the two groups of the incoming line insulator supports (46) and the outgoing line insulator supports (47) are arranged on both sides of the DC switch (29).

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