Service entrance removable pullout unit assembly

Abstract

This invention belongs to the field of low-voltage switchgear technology, specifically relating to a removable and withdrawable incoming line unit assembly. This removable and withdrawable incoming line unit assembly includes: a unit base plate and a unit rear plate. A circuit breaker is installed on the unit base plate. The incoming line side of the unit assembly has a main circuit connector connected to the vertical busbar, and the unit compartment has an outgoing line busbar. An insulated transformer is fitted onto the outgoing line busbar in the unit compartment, exposing the connection portion at the front of the outgoing line busbar. The incoming end of the circuit breaker is connected to the main circuit connector via an incoming line connector, and the outgoing end of the circuit breaker is connected to the outgoing line busbar in the unit compartment. When the unit base plate is moved to the unit compartment connection position, the main circuit connector on the incoming line side is connected and conductive to the vertical busbar, and the connection portion of the circuit breaker's outgoing line connector is connected and conductive to the outgoing line busbar in the unit compartment. This assembly allows for a removable connection of the main incoming line and a fixed connection of the outgoing line, enabling disconnection of the main circuit incoming power supply in case of unit malfunction, thus allowing for uninterrupted maintenance.

Description

Technical Field

[0001] This invention belongs to the field of power distribution function in low-voltage switchgear technology, specifically relating to an incoming line removable withdrawable unit assembly. Background Technology

[0002] Currently, low-voltage switchgear for currents below 630A uses two types of cabinets: withdrawable units and fixed pluggable units.

[0003] Currently, most withdrawable circuit breakers on the market use a fixed molded case circuit breaker (MCCB). Both the incoming and outgoing sides of the fixed MCCB have main circuit connectors, which are connected to the fixed MCCB via copper busbars. When the withdrawable unit moves to the connection position via its push-up mechanism, the main circuit connectors on both sides connect to the vertical busbar and the user's outgoing line, respectively. When the fixed MCCB closes, the vertical busbar and the user's outgoing line are connected, energizing the user's equipment. However, existing withdrawable units require flipping the main circuit connectors to connect to the fixed MCCB, and the current transformer on the outgoing side needs to be fixed with a spreader beam. Auxiliary circuit connectors are also required on the outgoing side, making the outgoing connection structure very complex and increasing the unit's outgoing cost.

[0004] Fixed plug-in units connect to fixed plug-in circuit breakers via bases for incoming and outgoing lines, so there are no withdrawable units in the unit compartment. The circuit breaker is manually operated to connect to the base. Therefore, the unit compartment structure is very simple, but the main circuit connection structure is in the cable compartment. The unit cabinet is 600mm wide, and the application cost is lower than that of withdrawable units.

[0005] In the past 10 years, due to the higher cost of the withdrawable unit structure compared to the fixed plug-in unit, the fixed plug-in unit for power distribution functions has been used extensively. However, users have gradually discovered the shortcomings of the fixed plug-in unit: 1. Because the fixed plug-in unit connects the incoming and outgoing lines to the base, and the base is then connected to the circuit breaker, the unit compartment does not have a pushing mechanism. The circuit breaker must be pulled out of the base by hand, and 630A and 400A circuit breakers cannot be pulled out by hand; 2. The base and the vertical busbar are fixedly connected. If the base fails and needs to be replaced, the vertical busbar must be de-energized for maintenance, and all equipment powered by that vertical busbar must be de-energized; 3. In terms of preventing misoperation, the domestic fixed plug-in circuit breakers used in the fixed plug-in unit do not have a self-tripping device or a closing interlocking mechanism. The circuit breaker can still be inserted into the base when it is closed. If the vertical busbar is energized at this time, arcing may cause personal injury. Foreign brand circuit breakers have self-tripping devices, but one self-tripping device costs 125 yuan. Assuming that a low-voltage switchgear is equipped with seven fixed plug-in units, the cost of seven self-tripping devices increases significantly.

[0006] In view of the high cost of the current withdrawable unit structure and the insufficient functionality of the fixed plug-in unit, and the fact that the side-outlet structure of both withdrawable and fixed plug-in units makes the low-voltage switchgear too large and the outlet structure more complicated, this application proposes a withdrawable unit assembly with movable incoming line, which solves both the rear and side-outlet of the unit, thus simplifying the structure and reducing the cost. Summary of the Invention

[0007] The purpose of this invention is to provide an incoming line removable pull-out unit assembly, which can disconnect the main circuit incoming power supply when the unit fails at a lower cost than a fixed plug-in unit, thus enabling uninterrupted maintenance.

[0008] To address this, the present invention provides an inlet-movable withdrawable unit assembly, comprising: a unit base plate and a unit rear plate, wherein a circuit breaker is provided on the unit base plate; a unit compartment rear plate, wherein a main circuit plug is provided on the inlet side for connecting to the vertical busbar, and a unit compartment outlet busbar is provided on the outlet side; a current transformer, wherein an insulating sleeve is fitted onto the unit compartment outlet busbar, exposing the connection portion at the front of the unit compartment outlet busbar; the inlet end of the circuit breaker is connected to the main circuit connector via an inlet connection busbar, and the outlet end of the circuit breaker is connected to an outlet connection busbar; when the unit base plate moves toward the unit compartment to the connection position, the main circuit connector is connected to the vertical busbar, and the outlet connection busbar is connected and connected to the connection portion of the unit compartment outlet busbar.

[0009] Furthermore, the unit base plate is provided with a push screw; the unit chamber rear plate is connected to the unit chamber base plate, and the unit chamber base plate is provided with a screw nut; the push screw is aligned with the screw nut, and when the push screw is screwed into the screw nut, the unit base plate moves toward the unit chamber rear plate.

[0010] Furthermore, the rear panel and bottom panel of the unit room are connected to columns, and two columns are connected to a secondary cable support; the secondary cable support is provided with a cable routing groove.

[0011] Furthermore, the connecting part is an opening located at the front of the outgoing line bar of the unit compartment; one end of the outgoing line connecting bar is connected to the outgoing end of the circuit breaker, and the other end extends out of the circuit breaker and bends to form a bend with a through hole and a rivet nut. When the circuit breaker moves with the unit base plate to the unit compartment and reaches the connection position, the through hole of the bend of the outgoing line connecting bar is aligned with the through hole at the front of the outgoing line bar of the unit compartment so as to insert the outgoing line bar connector and connect the bend of the outgoing line connecting bar with the connecting part of the outgoing line bar of the unit compartment and make it conductive.

[0012] Furthermore, the front end of the unit base plate is provided with a closing interlock mechanism.

[0013] Furthermore, the unit chamber floor is provided with a position positioning component; the front end of the unit floor is provided with a position interlocking mechanism.

[0014] Furthermore, the unit chamber floor is provided with guide rails; the unit floor is provided with sliding columns.

[0015] Furthermore, a side-outlet base plate is connected to the rear plate of the unit chamber; the root of the unit chamber outlet cable is bent and extends toward the side-outlet base plate, and then bent again, so that the user can connect the wires on the front side of the side-outlet base plate.

[0016] The beneficial effect of this invention is that, while the main circuit connector is still provided on the incoming side of the circuit breaker in this movable withdrawable unit assembly, on the outgoing side of the circuit breaker, the current transformer is no longer provided on the outgoing connection busbar led out from the outgoing terminal of the circuit breaker. Instead, a unit compartment outgoing busbar is provided on the rear plate of the unit compartment, and the current transformer is fitted onto the unit compartment outgoing busbar. After the circuit breaker moves with the unit base plate to the rear plate of the unit compartment and enters the connection position of the unit compartment, the outgoing connection busbar connects to the unit compartment outgoing busbar through the exposed connection part, thus eliminating the need for a circuit breaker. The main circuit connector on the outgoing side reduces the cost of a single main circuit connector, while still allowing the vertical busbar to be disconnected from the outgoing connection busbar via circuit breaker tripping without power interruption. First, disconnect the outgoing connection busbar and the unit compartment outgoing busbar when neither is energized. Then, remove the unit base plate to disconnect the main circuit connector from the vertical busbar, enabling uninterrupted maintenance of the vertical busbar. Furthermore, the current transformer is no longer removed with the unit base plate, eliminating the need to disconnect the wiring between the current transformer and the instruments on the door panel during maintenance. This assembly features a movable connection for the unit's main incoming line and a fixed connection for the outgoing lines, reducing the cost of unit outgoing line applications and enabling disconnection of the main circuit incoming power supply in case of unit malfunction, thus achieving uninterrupted maintenance. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the unit base plate portion of the movable pull-out unit assembly of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the unit base plate portion of the movable pull-out unit assembly of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the structure of the movable pull-out unit assembly of the present invention; Figure 4 This is a schematic diagram of the rear panel of the unit chamber of the movable pull-out unit assembly of the present invention. Figure 1 ; Figure 5This is a schematic diagram of the rear panel of the unit chamber of the movable pull-out unit assembly of the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the unit compartment of the movable withdrawable unit assembly of the present invention. Figure 1 ; Figure 7 This is a schematic diagram of the structure of the unit base plate portion of the movable pull-out unit assembly of the present invention. Figure 3 ; Figure 8 This is a schematic diagram of the structure of the unit base plate portion of the movable pull-out unit assembly of the present invention. Figure 4 ; Figure 9 This is a schematic diagram of the structure of the unit base plate portion of the movable pull-out unit assembly of the present invention. Figure 5 ; Figure 10 This is a schematic diagram of the structure of the unit base plate portion of the movable pull-out unit assembly of the present invention. Figure 6 ; Figure 11 This is a schematic diagram of the outgoing cable connection bar of the movable pull-out unit assembly of the present invention being connected to the outgoing cable bar of the unit room; Figure 12 This is a schematic diagram of the outgoing line connection bar of the movable withdrawable incoming line unit assembly of the present invention when it is separated from the outgoing line bar of the unit chamber; Figure 13 This is a schematic diagram of the present invention when the removable pull-out unit assembly is of 125A or 250A specification. Figure 14 This is a schematic diagram of the present invention when the inlet removable withdrawable unit assembly is of specification 400A or 630A. Figure 15 This is a schematic diagram of the present invention with the rear exit line when the inlet line movable pull-out unit assembly is used; Figure 16 This is a schematic diagram of the side-outlet cable when the inlet removable pull-out unit assembly of the present invention is of specification 125A or 250A. Figure 17 This is a schematic diagram of the side-outlet cable when the inlet removable withdrawable unit assembly of the present invention is of specification 400A or 630A. Figure 18 This is a schematic diagram of the present invention's removable pull-out unit assembly using an inlet cable cover. Figure 1 ; Figure 19 This is a schematic diagram of the present invention's removable pull-out unit assembly using an inlet cable cover. Figure 2 ; In the picture: Unit base plate 100, circuit breaker 110, incoming line connection bar 111, outgoing line connection bar 112, main circuit connector 120, sliding column 130, unit rear plate 140, unit compartment rear plate 200, unit compartment outgoing line bar 210, connection part 211, current transformer 220, unit compartment base plate 230, position positioning component 232, guide rail 233, column 240, wiring trough 241, side outgoing line base plate 250, outgoing line bar connector 300, push 410 lead screw, 500 closing interlocking mechanism, 600 position interlocking mechanism, 710 vertical busbar, 720 secondary line bracket, 730 slotted positioning component, 740 pad, 750 opening and closing shaft, 760 outgoing line cover, 770 moving plug for incoming line cover, 780 incoming line cover, 790 incoming line connecting busbar plug, 810 door panel, 820 circuit breaker mounting plate, 830 circuit breaker mounting plate connector, 840 incoming line side guard plate. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments implemented by those skilled in the art without creative effort are within the protection scope of the present invention.

[0020] Example like Figures 1 to 5 As shown, the present invention provides an inlet-movable withdrawable unit assembly, including: a unit base plate 100 and a unit rear plate 140, wherein a circuit breaker 110 is provided on the unit base plate 100; a unit compartment rear plate 200, wherein the inlet side is provided with a main circuit plug connected to a vertical busbar 710, and the outlet side is provided with a unit compartment outlet busbar 210; a current transformer 220, which is insulated and sleeved on the unit compartment outlet busbar 210, so that the connecting part 211 at the front of the unit compartment outlet busbar 210 is exposed; the inlet end of the circuit breaker 110 is connected to the main circuit connector 120 through the inlet connector 111, and the outlet end of the circuit breaker 110 is connected to the outlet connector 112. When the unit base plate 100 moves toward the unit compartment to the connection position, the main circuit connector 120 is connected to the vertical busbar 710, and the outlet connector 112 is connected to and connected to the connecting part 211 of the unit compartment outlet busbar 210.

[0021] This removable withdrawable unit assembly still has a main circuit connector 120 on the incoming side of the circuit breaker 110. However, on the outgoing side of the circuit breaker 110, the current transformer 220 is no longer installed on the outgoing connection bus 112 leading out from the outgoing terminal of the circuit breaker 110. Instead, a unit compartment outgoing bus 210 is installed on the rear plate 200 of the unit compartment. The current transformer 220 is fitted onto the unit compartment outgoing bus 210. After the circuit breaker 110 moves with the unit base plate 100 to the rear plate 200 of the unit compartment and enters the connection position of the unit compartment, the outgoing connection bus 112 connects to the unit compartment outgoing bus 210 through the exposed connection part 211, thus eliminating the need for the circuit breaker 110. The main circuit connector on the outgoing side reduces the cost of a single main circuit connector, while still allowing the vertical busbar 710 to be disconnected from the outgoing connection bar 112 via the circuit breaker 110 without power interruption. First, disconnect the outgoing connection bar 112 and the unit compartment outgoing connection bar 210 while they are de-energized. Then, remove the unit base plate 100, disconnecting the main circuit connector 120 from the vertical busbar 710, enabling uninterrupted maintenance of the vertical busbar 710. Furthermore, the current transformer 220 is no longer removed with the unit base plate 100, eliminating the need to disconnect the wiring between the current transformer 220 and the instruments on the door panel during maintenance. This assembly features a movable connection for the unit's main incoming line and a fixed connection for the outgoing line, reducing the cost of unit outgoing line applications and enabling disconnection of the main circuit incoming power supply in case of unit malfunction, thus achieving uninterrupted maintenance.

[0022] The main circuit connector 120 used in this application is the same as the main circuit connector in our previous application CN121282061A, including, for example... Figure 1 and Figure 2 The part set on the incoming line connector 111, and such as Figure 4 The incoming line connection busbar plug 790 is located on the rear panel 200 of the unit compartment. The incoming line connection busbar plug 790 is the main circuit connector located on the rear panel of the unit compartment as described in section

[0073] of CN121282061A. The main circuit plug located on the incoming side of the rear panel 200 of the unit compartment is also known as the incoming line connection busbar plug 790.

[0023] like Figure 2 , 3As shown in Figure 4, one layout of this removable withdrawable unit assembly can be as follows: a unit rear plate 140 is provided on the incoming side of the unit base plate 100, the circuit breaker 110 is centered relative to the unit base plate 100, and the three incoming terminals of the circuit breaker 110 are respectively connected to the corresponding parts of the main circuit connector 120 through the incoming connection busbar 111. The main circuit connector 120 is fixed on the unit rear plate 140. When the unit base plate 100 moves towards the unit compartment and reaches the connection position, the main circuit connector... The portion of component 120 located on the incoming line connection busbar 111 is connected and conductive to the portion of the incoming line connection busbar plug 790 located on the rear panel 200 of the unit compartment. The portion of the incoming line connection busbar plug 790 located on the rear panel 200 of the unit compartment is normally conductive to the vertical busbar 710. The portion of the main circuit connector 120 located on the incoming line connection busbar 111 is conductive to the vertical busbar 710. When the circuit breaker 110 is closed, the outgoing line connection busbar 112 is also conductive to the vertical busbar 710. When the withdrawable unit is removed from the unit compartment, the incoming line connection busbar plug 790 can achieve an IP40 protection rating.

[0024] The current transformer 220 used in this application is the same as the current transformer in our previous application CN223427351U. The current transformer 220 is installed on the unit compartment outlet busbar 210 by passing the copper busbar through the copper busbar through hole on it. Then, the copper busbar fastener passes through the fixing hole on the current transformer 220 to fix the current transformer 220 on the unit compartment outlet busbar 210. Its insulation method is also the same as that in CN223427351U.

[0025] In at least one embodiment, the method for moving the unit base plate 100 toward the unit chamber rear plate 200 can be by using a hand-cranked propulsion mechanism. This hand-cranked propulsion mechanism can have the same structure as described in our previous application CN121282061A. Figures 6 to 8 As shown, the unit base plate 100 is provided with a push screw 410; the unit chamber rear plate 200 is connected to a unit chamber base plate 230, and the unit chamber base plate 230 is provided with a screw nut; the push screw 410 is aligned with the screw nut, and when the push screw 410 is screwed into the screw nut, the unit base plate 100 moves toward the unit chamber rear plate 200. As described in sections

[0087] and

[0094] of CN121282061A, after the push screw 410 is aligned with the screw nut, the unit base plate 100 can be moved toward the unit chamber rear plate 200 or away from the unit chamber rear plate 200 by operating the hand-cranked push mechanism with a hand-cranked tool.

[0026] like Figure 6As shown, columns 240 are connected to the rear panel 200 and the bottom panel 230 of the unit compartment, and two columns 240 are connected to the secondary line bracket 720; the secondary line bracket 720 is provided with a cable tray 241. Since the current transformer 220 of this removable pull-out unit assembly is no longer connected to the outgoing line connection bar 112 of the circuit breaker 110, the current transformer 220 is no longer pulled out with the unit bottom panel 100 when inspecting the components. Therefore, a cable tray 241 can now be set on the right side of the unit compartment to arrange the wires between the current transformer 220 and the instruments on the door panel 810, while leaving space between the cable tray 241 and the outgoing line connection bar 300 to facilitate the disassembly and assembly of the outgoing line connection bar 300.

[0027] like Figure 4 and Figure 5 As shown, the connecting part 211 is an opening located at the front of the unit room outlet bar 210; as Figure 2 As shown, one end of the outgoing line connector 112 is connected to the outgoing line end of the circuit breaker 110, and the other end extends out of the circuit breaker 110 and is bent, forming a through hole with a rivet nut. Figure 3 , 11 As shown in Figure 12, after the circuit breaker 110 moves with the unit base plate 100 to the unit compartment rear plate 200, it will enter the connection position of the unit compartment. At this time, the through hole of the bent part of the outgoing line connection bar 112 is aligned with the through hole at the front of the outgoing line bar 210 of the unit compartment, and the outgoing line bar connector 300 can be inserted to connect and conduct the bent part of the outgoing line connection bar 112 to the connection part 211 of the outgoing line bar 210 of the unit compartment. When it is necessary to remove the unit base plate 100, it is still possible to disconnect the vertical busbar 710 from the outgoing line connection bar 112 by first tripping the circuit breaker 110 without energizing it. Then, the outgoing line bar connector 300 can be removed in a de-energized state, and then the unit base plate 100 can be pulled out to disconnect the main circuit connector 120 from the vertical busbar 710, so as to realize the vertical busbar 710 can be maintained without energizing it. The outgoing line bar connector 300 can be a bolt, which cooperates with the nut on the bent part to complete the connection.

[0028] In this removable withdrawable unit assembly, each of the three phases on the outgoing side has only one connection point between the outgoing line connection bar 112 and the unit room outgoing line bar 210. This is two fewer connection points than the single-phase outgoing line connection points of the fixed plug-in unit. It only takes three minutes to disconnect the three-phase outgoing line connection bar 112 from the unit room outgoing line bar 210. After that, the unit base plate 100 can be easily removed by hand-cranked push mechanism. In case of circuit breaker failure, maintenance is faster than that of the fixed plug-in unit.

[0029] Since the user scenario does not require auxiliary circuit connectors, this removable pull-out incoming line unit assembly also eliminates the auxiliary circuit connectors on the outgoing line side. This eliminates the need for space on the outgoing line side for auxiliary circuit connectors, reducing material and labor costs. The unit base plate 100mm and the unit compartment rear plate 200mm can be made narrower, allowing the cabinet width of this removable pull-out incoming line unit assembly to be reduced to 500mm. Overall, this saves 5.22kg of copper busbars and reduces the amount of steel plate used in a 2500A low-voltage switchgear. Compared to the fixed 600mm width of fixed plug-in unit cabinets, the amount of steel plate used is significantly reduced. The cost of this removable pull-out incoming line unit assembly is 40% lower than domestically produced pull-out units, 10-15% lower than domestically produced fixed plug-in units, and more than 50% lower than foreign brands of fixed plug-in units.

[0030] Low-voltage switchgear with a cabinet width greater than 500mm, a cabinet depth greater than 450mm, and a unit depth greater than 300mm can all be used with this removable pull-out incoming line unit assembly.

[0031] Based on the aforementioned cost reductions, this removable pull-out unit assembly, even when equipped with a closing interlock mechanism 500 and a position interlock mechanism 600, still has a lower cost than the fixed plug-in unit, while still providing the anti-misoperation functions of closing interlock and position interlock.

[0032] like Figure 10 As shown, the front end of the unit base plate 100 is provided with a closing interlocking mechanism 500. The closing interlocking mechanism 500 of this incoming line movable withdrawable unit assembly is the same as the closing interlocking mechanism in our previous application CN121282061A. As described in

[0108] of CN121282061A, it can realize that after the circuit breaker is closed, the incoming line movable withdrawable unit assembly is in a locked state, and the unlocking button cannot be pressed to operate the hand-cranked push mechanism. It cannot be withdrawn from the unit compartment, causing a trip, nor can it be pushed into the unit compartment, causing an arc. Similarly, this incoming line movable withdrawable unit assembly is also provided with a closing / opening shaft 750, which has the same function as the closing / opening shaft in CN121282061A.

[0033] like Figure 6 and Figure 9As shown, a position positioning component 232 is provided on the unit chamber floor 230; a position interlocking mechanism 600 is provided at the front end of the unit floor 100. The position positioning component 232 and the position interlocking mechanism 600 of this movable pull-out unit assembly are the same as those in our previous application CN121282061A. As described in sections

[0096] and

[0097] of CN121282061A, the position interlocking mechanism can be kept unlocked when the circuit breaker trips, and the unit floor 100 cannot be moved by the hand-cranked push mechanism. The unit floor 100 can only be moved by the hand-cranked push mechanism after the position interlocking mechanism is unlocked.

[0034] Therefore, the circuit breaker of this incoming line movable withdrawable unit assembly has a closing interlocking function. When the circuit breaker is closed, the withdrawable unit cannot enter the unit compartment, nor can its position be unlocked, making it very safe and reliable. Positioning of the unit or entry / exit from the unit compartment can only be performed when the circuit breaker is open.

[0035] like Figure 6 and Figure 7 As shown, the unit chamber base plate 230 is provided with a guide rail 233; the unit base plate 100 is provided with a sliding column 130. The guide rail 233 and the sliding column 130 cooperate to allow the unit base plate 100 to slide smoothly on the unit chamber base plate 230. In addition, a slotted positioning component 730 and a pad 740 can be provided on the unit chamber base plate 230. The slotted positioning component 730 is the same as that in our previous application CN222802401U. The slotted positioning component cooperates with the push screw of the hand-cranked push mechanism to prevent the unit push stroke from being misaligned. The pad 740 is used to support the unit base plate 100 to prevent the base plate from deforming and sagging, which would affect the plug contact performance.

[0036] Figure 13 and Figure 14 The different heights of this removable pull-out unit assembly are shown for different specifications.

[0037] When the outgoing lines of this removable withdrawable unit assembly are rear-outgoing, such as Figure 15 As shown, the unit compartment outlet cable 210 can pass directly through the unit compartment rear panel 200. In this case, an outlet cover 760 can be provided for the protruding unit compartment outlet cable 210. One end of the user's outlet cable is connected to the protruding unit compartment outlet cable 210, and the other end leads to the electrical equipment.

[0038] When the outgoing cable of this removable pull-out unit assembly is side-out, the incoming cable remains removable while the outgoing cable is fixedly connected. Figure 16 and Figure 17As shown, a side-outlet base plate 250 is connected to the rear panel 200 of the unit chamber; the root of the unit chamber outlet cable 210 is bent and extends to the side-outlet base plate 250, and then bent again. The user connects the cable on the front of the side-outlet base plate 250, and the other end of the cable is connected to the electrical equipment.

[0039] When the outgoing cables of this removable withdrawable unit assembly are side-out, the base width is increased by 250-300mm to 800mm, reducing the overall width of the unit cabinet. The unit chamber depth is 300mm, the vertical busbar depth is 150-200mm, and the cabinet depth is 450-500mm, resulting in a side-out distribution cabinet footprint of less than 1000mm x 600mm. This makes it suitable for marine equipment and offshore platforms, saving space. The side-out main circuit connection structure of this design has very low application costs and a wide range of applications.

[0040] This removable withdrawable incoming line unit assembly solves both the miniaturization of rear-outgoing and side-outgoing lines, meeting domestic and international application standards. For side-outgoing PC circuit unit equipment, application costs are significantly reduced, while also addressing the miniaturization requirements of international US standards for double-sided operating PC circuit equipment, thus reducing the volume occupied by marine low-voltage switchgear.

[0041] like Figure 18 and Figure 19 As shown, an inlet cable cover 780 can be installed on the rear panel 200 of the unit compartment, and the corresponding main circuit connector is a movable connector 770 equipped with the inlet cable cover. An opening is made in the rear panel 200 of the unit compartment, and the inlet cable cover 780 is embedded within the rear panel 200. The inlet cable cover 780 only has a through hole through which the plug of the movable connector 770 equipped with the inlet cable cover can pass. When the pull-out unit is removed from the unit compartment, the inlet cable cover 780 can achieve an IP20 protection level.

[0042] like Figure 9 As shown, the circuit breaker mounting plate 820 can be erected on the unit base plate 100 via the circuit breaker mounting plate connector 830 to install the circuit breaker 110.

[0043] like Figure 10 As shown, an incoming line side guard plate 840 can be installed on the unit base plate 100 to shield the incoming line connection bar 111, preventing the operator from contacting the energized incoming line connection bar 111 when the main circuit connector 120 is still connected to the vertical busbar 710.

[0044] In summary, this removable withdrawable unit assembly still has a main circuit connector 120 on the incoming side of the circuit breaker 110. However, on the outgoing side of the circuit breaker 110, the current transformer 220 is no longer installed on the outgoing connection bus 112 leading out from the outgoing terminal of the circuit breaker 110. Instead, a unit compartment outgoing bus 210 is installed on the rear plate 200 of the unit compartment. The current transformer 220 is fitted onto the unit compartment outgoing bus 210. After the circuit breaker 110 moves with the unit base plate 100 to the rear plate 200 of the unit compartment and enters the connection position of the unit compartment, the outgoing connection bus 112 connects to the unit compartment outgoing bus 210 through the exposed connection part 211, thus eliminating the need for a circuit breaker. The main circuit connector on the outgoing side of 110 reduces the cost of a single main circuit connector, while still allowing the vertical busbar 710 to be disconnected from the outgoing connection bar 112 via circuit breaker 110 without power interruption. First, disconnect the outgoing connection bar 112 and the unit compartment outgoing connection bar 210 while they are de-energized. Then, remove the unit base plate 100, disconnecting the main circuit connector 120 from the vertical busbar 710. This enables uninterrupted maintenance of the vertical busbar 710, and the current transformer 220 is no longer removed with the unit base plate 100, eliminating the need to disconnect the wiring between the current transformer 220 and the instruments on the door panel during maintenance. This assembly features a movable connection for the unit's main incoming line and a fixed connection for the outgoing lines, reducing the cost of unit outgoing line applications and enabling disconnection of the main circuit incoming power supply in case of unit malfunction, thus achieving uninterrupted maintenance.

[0045] In the embodiments provided in this application, it should be understood that the disclosed systems and devices can be implemented in other ways. The embodiments described above are merely illustrative. For example, the division of the mechanism is only a logical functional division, and there may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed.

[0046] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A line-in feedable, removable and extractable unit assembly, characterized in that include: Unit base plate (100) and unit rear plate (140), with a circuit breaker (110) provided on the unit base plate (100). The rear panel (200) of the unit compartment has a main circuit plug connected to the vertical busbar (710) on the inlet side and a unit compartment outlet bar (210) on the outlet side. After the current transformer (220) is insulated and sleeved on the unit chamber outlet bar (210), the connecting part (211) at the front of the unit chamber outlet bar (210) is exposed; The incoming end of the circuit breaker (110) is connected to the main circuit connector (120) through the incoming connection busbar (111). The outgoing end of the circuit breaker (110) is connected to the outgoing connection busbar (112). When the unit base plate (100) moves to the unit room and reaches the connection position, the main circuit connector (120) is connected to the vertical busbar (710), and the outgoing connection busbar (112) is connected to the connection part (211) of the unit room outgoing busbar (210) and is connected.

2. The removable pull-out unit assembly according to claim 1, characterized in that, The unit base plate (100) is provided with a push screw (410). The unit chamber rear plate (200) is connected to the unit chamber bottom plate (230), and the unit chamber bottom plate (230) is provided with a nut; The push screw (410) is aligned with the nut, and when the push screw (410) is screwed into the nut, the unit bottom plate (100) moves toward the unit chamber rear plate (200).

3. The removable pull-out unit assembly according to claim 2, characterized in that, The unit room rear plate (200) and unit room bottom plate (230) are connected to columns (240), and the two columns (240) are connected to the secondary line bracket (720). The secondary cable support (720) is provided with a cable routing groove (241).

4. The removable pull-out unit assembly according to claim 1, characterized in that, The connecting part (211) is an opening located at the front of the unit room outlet bar (210); One end of the outgoing line connecting bar (112) is connected to the outgoing end of the circuit breaker (110), and the other end extends out of the circuit breaker (110) and bends to form a bend with a through hole and a rivet nut. When the circuit breaker (110) moves to the unit room with the unit base plate (100) and reaches the connection position, the through hole of the bend of the outgoing line connecting bar (112) is aligned with the through hole at the front of the unit room outgoing line bar (210) so that the outgoing line bar connector (300) can be inserted to connect the bend of the outgoing line connecting bar (112) with the connection part (211) of the unit room outgoing line bar (210) and conduct electricity.

5. The removable pull-out unit assembly according to claim 2, characterized in that, The front end of the unit base plate (100) is provided with a closing interlocking mechanism (500).

6. The removable pull-out unit assembly according to claim 2, characterized in that, The unit room floor plate (230) is provided with a position positioning component (232); The front end of the unit base plate (100) is provided with a position interlocking mechanism (600).

7. The removable pull-out unit assembly according to claim 2, characterized in that, The unit room floor plate (230) is provided with guide rails (233); The unit base plate (100) is provided with a sliding column (130).

8. The removable pull-out unit assembly according to claim 1, characterized in that, A side-outlet base plate (250) is connected to the rear panel (200) of the unit chamber. The root of the unit room outlet bar (210) is bent and extends toward the side outlet board (250), and then bent again, so that the user can connect the wires on the front side of the side outlet board (250).

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