Non-overlapping main circuit connection structure and unit assembly

Abstract

The application relates to a non-overlapping main circuit connection structure and a unit assembly. The non-overlapping main circuit connection structure comprises a circuit breaker connection row and a main circuit connector, and the circuit breaker connection row is directly inserted into the main circuit connector and connected with a plug front socket of a conductive plug. The unit assembly comprises a unit and a unit chamber, a circuit breaker is installed in the unit, and the circuit breaker is connected with a main circuit through the non-overlapping main circuit connection structure. The main circuit connector of the scheme has a double socket structure and does not have a wiring row, so that the overlapping points are reduced, the connection distance H is reduced, and the copper amount of the copper row of the main circuit connection is reduced. The unit adopting the non-overlapping main circuit connection structure can further reduce the unit depth L, and the miniaturization of the unit is realized. The switch cabinet is miniaturized in appearance, and the application equipment reduces the construction cost. For various types of circuit breaker current level application design, only one design is needed, and the permanent design is standardized, and the standardization degree of the main circuit connection structure is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage switch cabinets, in particular to a non-overlap main circuit connection structure and a unit assembly. Background Art

[0002] Low-voltage switchgear is classified into drawer-type and plug-in units, and the circuit breakers used are all fixed main circuit connection structures. The main circuit connection structure of the drawer unit assembly is as follows: the circuit breaker is connected using a main circuit dynamic plug-in, which is plug-connected to the vertical busbar via a conductive plug, and the main circuit static plug-in for the output is plug-connected. The main circuit connection structure of the plug-in unit assembly is as follows: a conductive connector is fixed to the back of the fixed circuit breaker, and a base is provided. The base is plug-in connected to the circuit breaker via a socket, and the incoming line end of the base is fixedly connected to the vertical busbar via a circuit breaker connection bar.

[0003] Taking the 630A current specification as an example, for the two main circuit connection structures, the drawer unit occupies a depth of 450mm, and the plug-in unit occupies a depth of 450mm. The unit depth L and width of the low-voltage switchgear are defined to meet the 630A main circuit connection technical requirements. The main circuit connection structure of the 630A drawer unit assembly currently commonly seen in the market is as follows: Figure 1 As shown in the figure, the distance between the circuit breaker fixing position and the rear panel of the unit where the main circuit dynamic plug-in is installed, that is, the connection distance H is 180mm, and the unit depth L is 450mm. The main circuit connection structure of the 630A plug-in unit assembly currently commonly seen in the market is as follows Figure 2 As shown, the connection space H between the back of the base and the rear plate of the unit room must reach 150mm, and the unit depth L is 450mm. Figure 1 The main circuit connection structure of the drawer unit must go through a secondary transition, i.e., a flip row, before it can be connected to the circuit breaker. The connection structure is complex and the installation is labor-intensive. The copper used in the 630A circuit breaker connection bar, i.e., the copper bar, is 5.5 kg. Figure 2 The copper used for the circuit breaker connection bar in the plug-in unit's main circuit connection structure is 3 to 3.6 kg. However, the connection between the circuit breaker connection bar and the vertical busbar on the incoming line side of the base is fixed, and installation must be performed on the cabinet, which is labor-intensive and demanding. Users have reported that the plug-in main circuit connection structure does not meet the requirements for non-stop maintenance and rapid maintenance.

[0004] Drawer units and plug-in units require transformer arrangement, and there are too many types of circuit breakers used. The phase center distance D of different types of circuit breakers is different, the specifications of circuit breaker connection bars are also different, and the external dimensions of the applied transformers are different.

[0005] like Figure 1 The main circuit connection structure of the drawer unit assembly shown has the problem of large connection distance H and large amount of copper used. Figure 2The main circuit connection structure of the plug-in unit assembly shown has the problems of many connection points, complex connection process and large connection distance H.

[0006] At present, the relevant power departments in the industry advocate the miniaturization of new power equipment, energy conservation and emission reduction, cost reduction, and improvement of technical quality and performance. The low-voltage cabinet is 800mm deep and 500mm wide.

[0007] The applicant developed a main circuit connection structure in 2019, which is specifically disclosed in the invention patent document CN201911305639.X. The main circuit connection structure solves the technical problem of reducing connection points and shortening the connection distance H by setting the phase centers of the main circuit connectors to correspond to the phase centers of the corresponding phases of the circuit breaker. Figure 1 Compared with the main circuit connection structure of the drawer unit, the connection distance H can be reduced by 45mm. Figure 3 The drawer unit cabinet shown has a width of W500mm and a unit depth of L400mm. At the same time, the removable unit cabinet has a width of W600mm and a unit depth of L350mm.

[0008] However, the main circuit dynamic plug-in has a terminal block for connecting to the circuit breaker connection block, and there is still a lap point between the circuit breaker connection block and the terminal block of the main circuit dynamic plug-in. The lap point occupies the connection distance length. Summary of the Invention

[0009] The technical problem to be solved by the present invention is: how to further reduce the connection distance H and the amount of copper used in the copper busbars connected to the main circuit and achieve the technical goal of further reducing the unit depth;

[0010] Further solutions: Reduce the connection distance and shallow the unit depth to achieve equipment miniaturization of 630A units, that is, define the higher feasibility of switch cabinet miniaturization, and realize the application technology of plug-in units with a cabinet width of 500mm.

[0011] The technical solution adopted by the present invention to solve its technical problems is: a non-overlap main circuit connection structure, including a circuit breaker connection bar and a main circuit connector. The circuit breaker connection bar is used for conductive connection between the circuit breaker and the main circuit connector. The main circuit connector is plugged in through a conductive plug. The main circuit connector connected to the circuit breaker through the circuit breaker connection bar is a double-socket main circuit connector. The circuit breaker connection bar is directly inserted into the double-socket main circuit connector and plugged in with the front plug socket of the conductive plug.

[0012] Preferably, the dual-socket main circuit connector includes a plug insulating shell and a conductive plug positioned by the plug insulating shell, the conductive plug has a front plug socket and a rear plug socket, the plug insulating shell has a circuit breaker connection bar socket, the circuit breaker connection bar is directly inserted into the main circuit connector through the circuit breaker connection bar socket, and is plug-connected with the front plug socket of the conductive plug. The dual-socket main circuit connector is fixed to the rear end plate of the unit through the plug insulating shell as a movable plug, and the circuit breaker connection bar and the plug insulating shell are fixed by fasteners.

[0013] Alternatively, the dual-socket main circuit connector includes a plug insulating shell and a conductive plug positioned by the plug insulating shell, the conductive plug having a front plug socket and a rear plug socket, the plug insulating shell having a shell front socket, the circuit breaker connection bar directly inserted into the main circuit connector through the shell front socket, and plug-connected with the plug front socket of the conductive plug, the dual-socket main circuit connector as a static plug-in is fixed to the unit chamber rear plate through the plug insulating shell, the rear end of the circuit breaker connection bar as a dynamic plug-in is fixed to the unit rear end plate through the dynamic plug-in insulating shell, the dynamic plug-in insulating shell has a circuit breaker connection bar socket, the rear end of the circuit breaker connection bar passes through the circuit breaker connection bar socket, and the rear end of the circuit breaker connection bar and the dynamic plug-in insulating shell are fixed by fasteners.

[0014] Further preferably, the socket of the circuit breaker connection bar has a certain length for guiding the insertion of the conductive plug into the circuit breaker connection bar for connection.

[0015] More preferably, the fastener is a detachable fastener, specifically a bolt fastener, and the sides of the circuit breaker connection bar and the circuit breaker connection bar socket are provided with fixing through holes, and the bolt fastener fixes the circuit breaker connection bar by passing through the fixing through holes of the circuit breaker connection bar and the circuit breaker connection bar socket.

[0016] Preferably, the main circuit connectors of each phase on the incoming and outgoing sides connected to the circuit breaker through the circuit breaker connection bars are arranged in layers from top to bottom, and the phase centers CL are arranged corresponding to the phase centers CL of the corresponding phases of the circuit breaker. The main circuit connectors of each phase on the incoming and outgoing sides connected to the circuit breaker through the circuit breaker connection bars are connected one-to-one with the corresponding phases of the circuit breaker through the circuit breaker connection bars arranged in layers from top to bottom.

[0017] A unit assembly, specifically a unit assembly of a low-voltage switchgear, comprises a unit and a unit chamber. A circuit breaker is installed in the unit, and the circuit breaker is connected to the main circuit via the above-mentioned non-lap main circuit connection structure.

[0018] Preferably, the B mutual inductor on the outgoing side, which is sleeved on the B-phase circuit breaker connection bar, is installed through a mutual inductor bracket installed on the rear end plate of the unit, and the B mutual inductor is arranged close to the B-phase main circuit connector.

[0019] The beneficial effects of the present invention are as follows: the structure of the main circuit connector of this solution is a double socket, without a terminal block, and the number of overlap points is reduced, thereby reducing the connection distance H and the amount of copper used for the copper busbar connected to the main circuit. The main circuit connector also does not need to connect the copper busbar, which reduces the cost.

[0020] The 630A unit using the non-overlap main circuit connection structure of the present invention can further reduce the unit depth L, achieve unit miniaturization, and reduce infrastructure costs.

[0021] The non-overlap main circuit connection structure of this solution is a highly standardized connection structure. It is designed for the current level applications of various types of circuit breakers. The phase center CL of the main circuit connector is set correspondingly with the phase center CL of the corresponding phase of the circuit breaker. As long as it is designed once, it will become a permanent design and finalized structure.

[0022] The non-overlap main circuit connection structure and circuit breaker installation process of this solution are both installed on the working platform, saving installation labor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0024] Figure 1 This is a schematic diagram of the structure of an existing 630A drawer unit assembly that connects the main circuit by flipping.

[0025] Figure 2 It is a structural diagram of the existing 630A plug-in unit assembly;

[0026] Figure 3 This is a schematic diagram of the structure of an existing 630A drawer unit assembly with main circuit connection through the phase center CL;

[0027] Figure 4 It is a schematic structural diagram of a 125A conductive plug of the present invention;

[0028] Figure 5 It is a schematic structural diagram of a 250A conductive plug of the present invention;

[0029] Figure 6 It is a schematic structural diagram of a 375A conductive plug of the present invention;

[0030] Figure 7 This is a schematic structural diagram of a dual-socket main circuit connector of connector structure type 1 of the present invention;

[0031] Figure 8 This is a schematic structural diagram of a dual-socket main circuit connector of the second connector structure of the present invention;

[0032] Figure 9It is the structure schematic view of double-jack main circuit connector of the third connector structure form of the application;

[0033] Figure 10 It is the structure schematic view of the first connector structure form of the application without plug rear shell from the front side view;

[0034] Figure 11 It is the structure schematic view of the first connector structure form of the application without plug rear shell from the rear side view;

[0035] Figure 12 It is the structure schematic view of the second connector structure form of the application without plug rear shell from the front side view;

[0036] Figure 13 It is the structure schematic view of the third connector structure form of the application without plug front shell from the front side view;

[0037] Figure 14 It is the structure schematic view of the first connector structure form of the application without butt joint connection with circuit breaker connecting row;

[0038] Figure 15 It is the structure schematic view of the circuit breaker connecting row fixed with the moving connector insulation shell of the application;

[0039] Figure 16 It is the structure schematic view of the first connector structure form of the application inserted and connected with vertical bus;

[0040] Figure 17 It is the structure schematic view of the third connector structure form of the application inserted and connected with vertical bus;

[0041] Figure 18 It is the structure schematic view of the first or second connector structure form of the application inserted and connected with outlet static socket;

[0042] Figure 19 It is the structure schematic view of double-jack main circuit connector of the first structure principle of 125A of the application;

[0043] Figure 20 It is the structure schematic view of double-jack main circuit connector of the first structure principle of 250A of the application;

[0044] Figure 21 It is the structure schematic view of double-jack main circuit connector of the first structure principle of 400A of the application;

[0045] Figure 22 It is the structure schematic view of double-jack main circuit connector of the second structure principle of 125A of the application;

[0046] Figure 23This is a schematic structural diagram of a 250A dual-socket main circuit connector according to a second structural principle of the present invention;

[0047] Figure 24 This is a schematic structural diagram of a dual-socket main circuit connector according to the second structural principle of the 400A of the present invention;

[0048] Figure 25 This is a structural diagram of a non-overlap main circuit connection structure adopting the first structural principle of the present invention;

[0049] Figure 26 This is a structural diagram of a non-overlap main circuit connection structure adopting the second structural principle of the present invention;

[0050] Figure 27 yes Figure 25 A schematic diagram of the structure from the rear side perspective;

[0051] Figure 28 yes Figure 26 A schematic diagram of the structure from the rear side perspective;

[0052] Figure 29 This is a schematic diagram of the assembly of the non-overlap main circuit connection structure and the unit rear end plate using the first structural principle of the present invention;

[0053] Figure 30 This is a schematic diagram of the assembly of the non-overlap main circuit connection structure and the unit rear end plate using the second structural principle of the present invention;

[0054] Figure 31 yes Figure 29 A schematic diagram of the structure from the front side perspective;

[0055] Figure 32 yes Figure 30 A schematic diagram of the structure from the front side perspective;

[0056] Figure 33 This is a schematic diagram of the assembly of a 630A drawer unit assembly with a cabinet width of W600mm and a unit depth of L300mm, which adopts the first structural principle of the present invention and a non-overlap main circuit connection structure;

[0057] Figure 34 This is a schematic diagram of the assembly of a 630A drawer unit assembly with a cabinet width of W600mm and a unit depth of L300mm, which adopts the second structural principle of the present invention and a non-overlap main circuit connection structure;

[0058] Figure 35 This is a schematic diagram of the assembly of a 630A drawer unit assembly with a cabinet width of W500mm and a unit depth of L300mm, which adopts the second structural principle of the present invention and a non-overlap main circuit connection structure;

[0059] Figure 36 This is a schematic diagram of the assembly of a 630A removable pluggable unit assembly with a cabinet width of W600mm and a unit depth of L300mm, which adopts the first structural principle of the present invention and has a non-overlap main circuit connection structure;

[0060] Figure 37 This is a schematic diagram of the assembly of 125A and 250A drawer unit assemblies for control circuits with a cabinet width of W600mm and a non-overlap main circuit connection structure that adopts the first structural principle of the present invention;

[0061] Figure 38 yes Figure 37 The final assembly diagram from the rear side perspective;

[0062] Figure 39 This is a schematic diagram of the assembly of 400A and 650A drawer unit assemblies for control circuits with a cabinet width of W600mm and a non-overlap main circuit connection structure according to the first structural principle of the present invention;

[0063] Figure 40 yes Figure 39 The final assembly diagram from the rear side perspective;

[0064] Figure 41 Schematic diagram of the phase center CL and the phase center distance D of the circuit breaker of the present invention;

[0065] Figure 42 Schematic diagram of the phase center CL and the phase center distance D of the main circuit connector of the present invention;

[0066] In the figure, 1. Circuit breaker connection bar, 2. Circuit breaker, 3. Dual-socket main circuit connector, 4. Conductive plug, 4-1. Front plug socket, 4-2. Rear plug socket, 5. Plug insulating shell, 5-1. Circuit breaker connection bar socket, 5-2. Front plug shell, 5-3. Rear plug shell, 5-4. Front shell socket, 5-5. Fixing through hole, 6. Unit rear end plate, 7. Bolt fastener, 8. Unit room rear plate, 9. Moving plug insulating shell, 10. B mutual inductor, 11. Vertical busbar, 12. Outlet static socket, 13. Conventional main circuit connector, 13-1. Terminal block, 14. Mutual inductor bracket. DETAILED DESCRIPTION

[0067] like Figures 4-42 As shown, a non-overlap main circuit connection structure includes a circuit breaker connection bar 1 and a main circuit connector. The circuit breaker connection bar 1 is used for conductive connection between the circuit breaker 2 and the main circuit connector. The main circuit connector is plugged in through a conductive plug 4. The main circuit connector connected to the circuit breaker 2 through the circuit breaker connection bar 1 is a double-socket main circuit connector 3. The circuit breaker connection bar 1 is directly inserted into the double-socket main circuit connector 3 and plugged into the front plug socket 4-1 of the conductive plug 4.

[0068] The double-plug main circuit connector 3 of each phase of the incoming line side and the outgoing line side connected by the circuit breaker connecting row 1 and the circuit breaker 2 is arranged in layers from top to bottom, and the phase-to-phase center CL is arranged correspondingly with the phase-to-phase center CL of the corresponding phase of the circuit breaker 2, and the double-plug main circuit connector 3 of each phase of the incoming line side and the outgoing line side connected by the circuit breaker connecting row 1 and the circuit breaker 2 is connected one by one through the circuit breaker connecting row 1 arranged in layers from top to bottom and the circuit breaker 2.

[0069] The double-plug main circuit connector 3 has two structural principles.

[0070] As shown in Figure 7 , 8 , 10, 11, 12, 14, 16 and 18, the double-plug main circuit connector 3 of the first structural principle is fixed on the unit rear end plate 6 as a movable plug through the plug insulating shell 5, and the circuit breaker connecting row 1 and the plug insulating shell 5 are fixed through fasteners.

[0071] The double-plug main circuit connector 3 includes the plug insulating shell 5 and the conductive plug 4 positioned through the plug insulating shell 5. The plug insulating shell 5 has a circuit breaker connecting row socket 5-1, and the circuit breaker connecting row 1 is directly inserted into the double-plug main circuit connector 3 through the circuit breaker connecting row socket 5-1 and connected with the plug front socket 4-1 of the conductive plug 4.

[0072] The plug insulating shell 5 includes a plug front shell 5-2 and a plug rear shell 5-3, and the plug front shell 5-2 and the plug rear shell 5-3 are assembled together to form the plug insulating shell 5, and the conductive plug 4 is positioned in layers in the plug insulating shell 5.

[0073] The circuit breaker connecting row socket 5-1 has a certain length for guiding the circuit breaker connecting row 1. The fastener is a detachable fastener, which is specifically a bolt fastener 7. The circuit breaker connecting row 1 and the circuit breaker connecting row socket 5-1 have fixing through holes 5-5 on the side surfaces, and the bolt fastener 7 is fixed to the circuit breaker connecting row 1 by passing through the fixing through holes 5-5 of the circuit breaker connecting row 1 and the circuit breaker connecting row socket 5-1.

[0074] As shown in Figure 4 , 5 and 6, the conductive plug 4 is a prior art, which is composed of a conductive sheet, a spring, a fixed support and a tensioning fixing shaft. The current level of the conductive plug 4 is determined by the carrying capacity of the conductive sheet, the conductive plug 4 has a plug front socket 4-1 and a plug rear socket 4-2, the plug front socket 4-1 and the plug rear socket 4-2 of the conductive plug 4 are determined by the thickness of the vertical bus 11, the pressure of the conductive plug 4 is determined by the spring, and the tensioning fixing shaft is assembled with the fixed support.

[0075] like Figure 9 、 13 As shown in Figures 15 and 17, the structure of the dual-socket main circuit connector 3 of the second structural principle is basically the same as that of the dual-socket main circuit connector 3 of the first structural principle. It also includes a plug insulation shell 5 and a conductive plug 4 positioned by the plug insulation shell 5. The conductive plug 4 has a front plug socket 4-1 and a rear plug socket 4-2. The plug insulation shell 5 has a shell front socket 5-4. The circuit breaker connection bar 1 is directly inserted into the dual-socket main circuit connector 3 through the shell front socket 5-4 and is plug-connected with the front plug socket 4-1 of the conductive plug 4.

[0076] Compared with the first structural principle, the second structural principle differs in that: the dual-socket main circuit connector 3 is fixed to the unit chamber rear plate 8 through the plug insulating shell 5 as a static plug-in, and the rear end of the circuit breaker connection bar 1 is fixed to the unit rear end plate 6 through the movable plug-in insulating shell 9 as a movable plug-in. The movable plug-in insulating shell 9 has a circuit breaker connection bar socket 5-1, and the rear end of the circuit breaker connection bar 1 passes through the circuit breaker connection bar socket 5-1. The rear end of the circuit breaker connection bar 1 and the movable plug-in insulating shell 9 are fixed by fasteners.

[0077] The front socket 5-4 of the plug insulating housing 5 and the circuit breaker connection bar socket 5-1 of the movable plug insulating housing 9 are of a certain length to guide the circuit breaker connection bar 1. The sides of the circuit breaker connection bar 1 and the circuit breaker connection bar socket 5-1 of the movable plug insulating housing 9 have fixing holes 5-5. Bolt fasteners 7 secure the circuit breaker connection bar 1 by passing through the fixing holes 5-5 of the circuit breaker connection bar 1 and the circuit breaker connection bar socket 5-1 of the movable plug insulating housing 9.

[0078] like Figures 25-40 As shown, a unit assembly, specifically a unit assembly of a low-voltage switchgear, includes a unit and a unit chamber. A circuit breaker 2 is installed in the unit, and the circuit breaker 2 is connected to the main circuit through the above-mentioned non-overlap main circuit connection structure.

[0079] The outgoing-side B mutual inductor 10 is installed via a mutual inductor bracket 14 mounted on the unit's rear end plate 6. This allows the B mutual inductor 10, mounted on the B-phase circuit breaker connection bar 1, to be positioned as close to the B-phase dual-socket main circuit connector 3 as possible, minimizing the impact of the B mutual inductor 10 on the unit's depth L. The A and C mutual inductors, on the other hand, only require conventional installation. The structural principles of this mutual inductor arrangement are disclosed in the applicant's patent document CN202220361289.X.

[0080] Because the technical requirements for 630A main circuit connections determine the unit depth (L) and width of low-voltage switchgear, a 630A non-lapped main circuit connection structure is implemented. 400A, 250A, and 125A can also be implemented using the same structural principles. Therefore, the following, using the 630A non-lapped main circuit connection structure as an example, along with the accompanying drawings, further details the technical solution of the present invention.

[0081] The conductive plug 4 has various structural forms and openings, which are determined by the applied current and the thickness and width of the vertical busbar 11.

[0082] When the current carrying capacity of a single conductive sheet is 125A, Figure 4 As shown, a single conductive sheet is used to form a 125A conductive plug 4, such as Figure 5 As shown, two conductive sheets are combined to form a 250A conductive plug 4. Figure 6 As shown, three conductive sheets are combined to form the 375A conductive plug 4.

[0083] The commonly used 630A circuit breakers 2 have phase center distances D of 58mm, 46mm, 45mm, 44mm, and 43.5mm. The connection bars 1 of 630A circuit breakers have sizes of 6×40, 8×30, and 8×35.

[0084] Industry standards require that the layered height of the conductive plugs 4 of the 630A main circuit connector be 10mm less than the height of the circuit breaker connection row 1. The interphase electrical clearance of 630A must be no less than 12.5-16mm.

[0085] When the interphase spacing of a 630A circuit breaker 2 is 58mm, a 6×40 circuit breaker connection bar 1 is used, and the interphase electrical clearance is 18mm, which meets the interphase electrical clearance requirements. The layered combination height of three sets of 250A conductive plugs 4 can adapt to the 6×40 circuit breaker connection bar 1.

[0086] When the inter-phase center spacing of the 630A circuit breaker 2 is 43.7mm, 44mm, 45mm, or 46mm, to meet the inter-phase electrical clearance requirements, an 8×35 or 8×30 circuit breaker connection bar 1 is required, with inter-phase electrical clearances of 13.5mm, 14mm, 15mm, or 16mm, respectively. At the same time, only the layered combination height of two sets of 375A conductive plugs 4 can adapt to the 8×35 and 8×30 circuit breaker connection bars 1.

[0087] Therefore, the present invention provides three structural forms of dual-socket main circuit connectors 3, which are targeted at all models of circuit breakers 2 and achieve full coverage of all models of circuit breakers 2 in the industry.

[0088] The three structural forms of the 630A dual-socket main circuit connector 3 are as follows: Figure 7 、 10 and the connector structure shown in 11, as shown in Figure 8 and 12 The connector structure shown in the second and Figure 9 and 13 The connector structure shown is form three.

[0089] The 630A dual-socket main circuit connector 3 of connector structures 1 and 2 share the same structural principles. The first structural principle is used to achieve a seamless connection between the circuit breaker connection bar 1 and the dual-socket main circuit connector 3. That is, connector structures 1 and 2 serve as movable connectors secured to the unit rear end plate 6 via the plug insulating housing 5. Fasteners secure the circuit breaker connection bar 1 to the plug insulating housing 5.

[0090] The difference between connector structures 1 and 2 is that connector structure 1 uses a 250A conductive plug 4 composed of three groups of two conductive plates, which is compatible with a 6×40 circuit breaker connection bar 1. This meets the requirements for non-overlapping main circuit connections of a 630A circuit breaker 2 with a phase-to-phase spacing greater than or equal to 55mm. Connector structure 1 is universal on both the incoming and outgoing sides.

[0091] Connector structure type 2 uses a 375A conductive plug 4 composed of two groups of three conductive plates, and is compatible with 8×35 and 8×30 circuit breaker connection bars 1. This meets the requirements for non-overlapping main circuit connections of 630A circuit breakers 2 with a phase-to-phase spacing greater than or equal to 43.7mm. Connector structure type 2 is only used on the outgoing line side.

[0092] The 630A dual-socket main circuit connector 3 of connector structure type three adopts the second structural principle to achieve a non-overlap connection between the circuit breaker connection bar 1 and the dual-socket main circuit connector 3. That is, the connector structure type three serves as a static plug-in fixed to the unit chamber rear plate 8 through the plug insulating shell 5, and the rear end of the circuit breaker connection bar 1 serves as a movable plug-in fixed to the unit rear end plate 6 through the movable plug insulating shell 9. The movable plug insulating shell 9 has a circuit breaker connection bar socket 5-1. The rear end of the circuit breaker connection bar 1 passes through the circuit breaker connection bar socket 5-1. The rear end of the circuit breaker connection bar 1 and the movable plug insulating shell 9 are fixed by fasteners, such as Figure 15 and 17 shown.

[0093] The third connector structure is used for the incoming line side and is directly plugged into the vertical busbar 11 through the conductive plug 4.

[0094] Connector structure three uses a 375A conductive plug 4 composed of two groups of three conductive plates, which is compatible with 8×35 and 8×30 specifications of circuit breaker connection bars 1, meeting the requirements for non-overlap main circuit connection of 630A circuit breakers 2 with a phase-to-phase center spacing greater than or equal to 43.7mm.

[0095] The specific adaptation parameters of the non-overlap main circuit connection structure of the present invention using connector structure form 1, connector structure form 2 and connector structure form 3 are shown in the following table:

[0096]

[0097]

[0098] On the basis of realizing the 630A non-lap main circuit connection structure, 400A, 250A and 125A can also realize the non-lap main circuit connection structure by using the same structural principle. Figure 21 and 24 As shown, the 400A dual-socket main circuit connector 3 uses two sets of 250A conductive plugs 4. Figure 20 and 23 As shown, the 250A dual-socket main circuit connector 3 uses a set of 250A conductive plugs 4. Figure 19 and 22 As shown, the 125A dual-socket main circuit connector 3 uses a set of 125A conductive plugs 4.

[0099] like Figure 25 、 27 , 29 and 31 are the main circuit connection structures without overlaps in which both the incoming and outgoing sides of the present invention adopt the first structural principle.

[0100] Figure 26 、 28 , 30 and 32 show the non-overlap main circuit connection structure of the present invention, in which the second structural principle is adopted on the incoming side and the first structural principle is adopted on the outgoing side.

[0101] Figure 33 This is the assembly diagram of a 630A drawer unit assembly with a cabinet width of W600 and a unit depth of L300, which adopts the first structural principle and a non-overlap main circuit connection structure. Figure 36 This is a schematic diagram of the final assembly of a 630A removable pluggable unit assembly, with a cabinet width of 600mm and a unit depth of 300mm, using the first structural principle of the present invention. The connection distance H between the two units is 80mm. In both unit assemblies, the dual-socket main circuit connector 3 on the incoming line side acts as a movable plug-in connection to the vertical busbar 11, while the dual-socket main circuit connector 3 on the outgoing line side acts as a movable plug-in connection to the outgoing static receptacle 12.

[0102] Figure 34 This is a schematic diagram of the assembly of a 630A drawer unit assembly with a cabinet width of W600mm, a unit depth of L300mm, and a connection distance of H80mm, using the second structural principle on the incoming side and the first structural principle on the outgoing side, with a non-overlap main circuit connection structure of the present invention. Figure 35 This is a schematic diagram of the final assembly of a 630A drawer unit assembly, with a cabinet width of W500mm, a unit depth of L300mm, and a connection distance of H90mm, employing the second structural principle for the incoming line side and the first structural principle for the outgoing line side, using a non-overlap main circuit connection structure. In these two unit assemblies, the dual-socket main circuit connector 3 on the incoming line side, acting as a static connector, is secured to the unit compartment rear panel 8 via a plug insulating housing 5. The rear end of the circuit breaker connection bar 1, acting as a dynamic connector, is secured to the unit rear panel 6 via a dynamic connector insulating housing 9. The rear plug socket 4-2 of the conductive plug 4 of the dual-socket main circuit connector 3 is plugged into a vertical busbar 11. When the unit is advanced to the connected position, the rear end of the circuit breaker connection bar 1 plugs into the front plug socket 4-1 of the conductive plug 4 of the dual-socket main circuit connector 3. The dual-socket main circuit connector 3 on the outgoing line side, acting as a dynamic connector, plugs into the outgoing static receptacle 12.

[0103] Figure 37 、 38 Figures 39 and 40 are schematic diagrams of the overall assembly of a drawer unit assembly for a control circuit with a cabinet width of W600, employing the first structural principle of a non-overlapping main circuit connection structure on the incoming line side of the present invention. The main circuit connector on the incoming line side of the two unit assemblies is a dual-socket main circuit connector 3. The incoming line side of the circuit breaker 2 is connected to the dual-socket main circuit connector 3 via a circuit breaker connection bar 1. The outgoing line side main circuit connector is a conventional main circuit connector 13 with a terminal block 13-1. The outgoing line side of the circuit breaker 2 is connected to the outgoing line main circuit connector via wires. The dual-socket main circuit connector on the incoming line side acts as a movable plug-in connector connected to the vertical busbar 11, while the conventional main circuit connector 13 on the outgoing line side acts as a movable plug-in connector connected to the outgoing static socket 12.

[0104] It should also be noted that the bending type of the circuit breaker connection bar that is directly inserted into the front socket of the plug of the main circuit connector can be changed, depending on the layout position of the circuit breaker and the layout of the transformer.

[0105] In summary, compared with the prior art, the dual-socket main circuit connector 3 of the present invention does not have the terminal block 13 - 1 . By omitting the overlap point, the connection distance H and the amount of copper used in the copper busbars connected to the main circuit are reduced.

[0106] compared to Figure 1 、 2The 630A unit with the non-overlapping main circuit connection structure of the application can further reduce the unit depth L, and realize a small 630A unit with the unit depth L of 300 mm, the cabinet width W of 600 mm, and the cabinet depth of 800 mm. A small 630A unit with the cabinet width W of 500 mm, the unit depth L of 350 mm, and the cabinet depth of 800 mm can also be realized.

[0107] The non-overlapping main circuit connection structure of the application is a connection structure with a very high standardization degree, and is correspondingly arranged with the inter-phase center CL of the double-plug main circuit connector 3 and the inter-phase center CL of the corresponding phase of the circuit breaker 2. Once designed, the structure is permanently designed and shaped.

[0108] The non-overlapping main circuit connection structure of the application and the installation process of the circuit breaker 2 are installed on a work platform. Compared with the main circuit connection structure of the prior art, Figure 1 the non-overlapping main circuit connection structure of the application saves 65% of time, saves 41% of copper for the circuit breaker connection row 1, and saves 27% of copper for the main circuit connector without the wiring row 13-1. The unit depth L is reduced by 100-150 mm to realize equipment miniaturization, and 10-16 kg of steel plate is saved for one equipment. The application of the technology in the industry saves 58% of copper for one equipment with 9 units to 7 units, the circuit breaker connection row 1, and the main circuit connector.

[0109] Compared with the main circuit connection structure of the prior art, Figure 1 the non-overlapping main circuit connection structure of the application can save fastening bolts. Compared with the main circuit connection structure of the prior art, Figure 2 the non-overlapping main circuit connection structure of the application saves 15% of copper for the circuit breaker connection row 1, reduces the unit depth L by 150 mm, reduces the cost of auxiliary components, saves 100% of labor for installation, and reduces the cost of unit structure by 2000-3000 yuan for one equipment. Compared with the cabinet depth of 1000 mm, the land occupation is reduced by 0.12 square meters for the cabinet width W of 600 mm and the cabinet depth of 800 mm, and the land occupation is reduced more for the cabinet width W of 500 mm and the cabinet depth of 800 mm.

[0110] The low-voltage draw-out type and plug-in type switch cabinet in the industry is applied to no less than 300,000 units per year. Compared with the switch cabinet with the cabinet depth of 1000 mm and the cabinet width W of 600 mm, Figure 1 and 2 the unit assembly. Seven to nine units are applied to each equipment, 9.5 kg of copper is saved for one equipment with different current levels, 42 fastening bolts are omitted, 15-17 kg of steel plate is saved, and 3 hours of labor is saved for installation and manufacturing.

[0111] The main circuit connector of the present invention integrates the main and auxiliary circuits into a seamless circuit breaker structure, greatly improving the process and standardization of the circuit breaker installation structure design and manufacturing process, and is applicable to drawer units and plug-in units. It is applicable to drawer-type switch cabinets with a width of W600mm, a minimum drawer unit depth of 300mm, and a cabinet depth of 800mm, as well as cabinets with a width of W500mm, a minimum drawer depth of 350mm, and a cabinet depth of 800mm. It is also applicable to plug-in cabinets with a width of W600, a minimum plug-in unit assembly depth of 300mm, and a cabinet depth of 800mm, as well as cabinets with a width of W500, a minimum plug-in unit assembly depth of 350mm, and a cabinet depth of 800mm. This technology enables miniaturization of equipment, saves copper and materials, and miniaturized equipment is achieved, filling a gap in application technology in this field and industry, reducing infrastructure costs, and providing a small device size and reduced floor space. The comprehensive social and economic benefits are substantial and long-term.

Claims

1. A non-overlap main circuit connection structure, comprising a circuit breaker connection bar (1) and a main circuit connector, wherein the circuit breaker connection bar (1) is used for conductive connection between the circuit breaker (2) and the main circuit connector, and the main circuit connector is plug-connected via a conductive plug (4), and is characterized by: The main circuit connector connected to the circuit breaker (2) through the circuit breaker connection bar (1) is a double-socket main circuit connector (3). The circuit breaker connection bar (1) is directly inserted into the double-socket main circuit connector (3) and plug-connected with the front plug socket (4-1) of the conductive plug (4).

2. The non-overlap main circuit connection structure according to claim 1, characterized in that: The dual-socket main circuit connector (3) comprises a plug insulating shell (5) and a conductive plug (4) positioned by the plug insulating shell (5), the conductive plug (4) having a front plug socket (4-1) and a rear plug socket (4-2), the plug insulating shell (5) having a circuit breaker connection row socket (5-1), the circuit breaker connection row (1) being directly inserted into the main circuit connector through the circuit breaker connection row socket (5-1), and being plug-connected with the front plug socket (4-1) of the conductive plug (4); The dual-socket main circuit connector (3) is fixed to the unit rear end plate (6) via the plug insulating shell (5) as a movable plug-in, and the circuit breaker connection row (1) and the plug insulating shell (5) are fixed via fasteners.

3. The non-overlap main circuit connection structure according to claim 1, characterized in that: The dual-socket main circuit connector (3) comprises a plug insulating shell (5) and a conductive plug (4) positioned by the plug insulating shell (5), the conductive plug (4) having a plug front socket (4-1) and a plug rear socket (4-2), the plug insulating shell (5) having a shell front socket (5-4), the circuit breaker connection bar (1) being directly inserted into the main circuit connector through the shell front socket (5-4), and being plug-connected with the plug front socket (4-1) of the conductive plug (4); The dual-socket main circuit connector (3) is fixed to the unit chamber rear plate (8) through the plug insulating shell (5) as a static plug-in, and the rear end of the circuit breaker connection row (1) is fixed to the unit rear end plate (6) through the movable plug-in insulating shell (9) as a movable plug-in, and the movable plug-in insulating shell (9) has a circuit breaker connection row socket (5-1), and the rear end of the circuit breaker connection row (1) passes through the circuit breaker connection row socket (5-1), and the rear end of the circuit breaker connection row (1) and the movable plug-in insulating shell (9) are fixed by fasteners.

4. The non-overlap main circuit connection structure according to claim 2 or 3, characterized in that: The circuit breaker connection bar socket (5-1) has a certain length and is used to guide the circuit breaker connection bar (1).

5. The non-overlap main circuit connection structure according to claim 4, characterized in that: The fastener is a detachable fastener, which is a bolt fastener (7). The sides of the circuit breaker connection bar (1) and the circuit breaker connection bar socket (5-1) are provided with fixing through holes (5-5). The bolt fastener (7) fixes the circuit breaker connection bar (1) by passing through the fixing through holes (5-5) of the circuit breaker connection bar (1) and the circuit breaker connection bar socket (5-1).

6. The non-overlap main circuit connection structure according to claim 1, characterized in that: The main circuit connectors of each phase on the incoming line side and the outgoing line side connected to the circuit breaker (2) through the circuit breaker connection row (1) are arranged in layers from top to bottom, and the phase center (CL) is set correspondingly to the phase center (CL) of the corresponding phase of the circuit breaker (2). The main circuit connectors of each phase on the incoming line side and the outgoing line side connected to the circuit breaker (2) through the circuit breaker connection row (1) are connected one-to-one with the corresponding phase of the circuit breaker (2) through the circuit breaker connection row (1) arranged in layers from top to bottom.

7. A unit assembly of a low-voltage switchgear, comprising a unit and a unit chamber, characterized in that: A circuit breaker (2) is installed in the unit, and the circuit breaker (2) is connected to the main circuit via the non-overlap main circuit connection structure described in claim 1, 2, 3 or 6.

8. The unit assembly of the low-voltage switchgear according to claim 7 is characterized in that: The B mutual inductor (10) on the B-phase circuit breaker connection row (1) on the outgoing line side is installed through a mutual inductor bracket (14) installed on the unit rear end plate (6), and the B mutual inductor (10) is set close to the main circuit connector of the B phase.

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