A maintenance-friendly compensation switchboard

Abstract

The present application relates to the technical field of power equipment, and particularly relates to a compensation power distribution cabinet convenient to maintain. The present application provides a compensation power distribution cabinet convenient to maintain, which comprises a cabinet body, a cabinet door rotatably connected to the cabinet body, three capacitors mounted in the cabinet body along a horizontal direction, three connection stakes evenly distributed along a longitudinal direction arranged at the top of each capacitor, and a protective cover arranged at the top of each capacitor for covering all the connection stakes at the top of the capacitor. The present application further comprises a stepped visual discharge assembly slidably connected to the cabinet body along a longitudinal direction for step-by-step discharging of the capacitors. The present application provides visual discharge feedback by means of the stepped visual discharge assembly and the on-off cycle of the bulb, so as to avoid manual missed connection. The one-way stepping locking assembly is used to force the sliding frame to move forward in one direction and lock back, so as to avoid operation failure in the middle of the process. The two components are used in cooperation to ensure complete discharge of the capacitor charge, and to significantly improve the operation safety and reliability.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and in particular to a compensating distribution cabinet that is easy to maintain. Background Technology

[0002] Capacitor-compensated switchgear (hereinafter referred to as compensation switchgear) is an important device in power systems used to improve the power factor. It contains power capacitors, which, through switching on and off, compensate locally for the lagging reactive power generated by inductive loads in the power grid. This effectively reduces line losses, improves transformer utilization, and stabilizes voltage quality. Therefore, capacitor-compensated switchgear is widely used in high-power scenarios such as industrial and mining enterprises and commercial buildings.

[0003] When maintaining or replacing capacitors in a capacitor compensation distribution cabinet, safe operation is paramount. The standard operating procedure requires disconnecting the main power supply and all compensation circuits, and allowing the capacitor to stand for at least five minutes to allow its internal discharge resistor to naturally release residual charge. However, if the capacitor's internal discharge resistor is damaged due to aging or quality issues, the stored energy will not be released automatically. In this case, manual forced discharge is necessary; otherwise, it can easily lead to electric shock. Currently, the industry-recognized safest and most effective discharge method is using an incandescent lamp (tungsten filament bulb). Since capacitors typically have three terminals, the operator must hold the two wires connected to the bulb and connect each terminal in pairs, performing three separate operations to ensure complete charge release. This traditional manual discharge method has significant drawbacks: firstly, it is inefficient, increasing maintenance time and costs; secondly, it relies entirely on manual memory and operation, making it prone to missed connections or poor contact, resulting in incomplete discharge and serious safety hazards for subsequent work; finally, manual operation increases the risk of personnel directly contacting live parts and lacks necessary mechanical protection and linkage mechanisms.

[0004] Therefore, existing capacitor compensation distribution cabinets urgently need an automated or semi-automated discharge mechanism to replace inefficient and high-risk manual operations during capacitor replacement, so as to ensure that capacitor discharge can be completed in a standardized, fast and thorough manner while opening the protective cover, thus ensuring the safety of operators. Summary of the Invention

[0005] To overcome the shortcomings of existing capacitor compensation distribution cabinets, which involve cumbersome and inefficient manual discharge when replacing capacitors, and pose safety hazards due to incomplete discharge, the technical problem to be solved is to provide a compensation distribution cabinet that is easy to maintain.

[0006] The technical solution of this invention is: a maintenance-friendly compensation distribution cabinet, comprising a cabinet body with a cabinet door rotatably connected to the cabinet body, three capacitors installed horizontally inside the cabinet body, three evenly distributed terminals on the top of each capacitor along the longitudinal direction, and a protective cover on the top of each capacitor to cover all the terminals on the top of the capacitor; further comprising: a stepped visual discharge assembly, the discharge assembly being slidably connected to the cabinet body along the longitudinal direction for discharging the capacitors in stages; a unidirectional step-locking assembly, the locking assembly being located between the cabinet body and the discharge assembly for forcing the discharge assembly to move in unidirectional steps and preventing it from retracting midway; and a linkage-type automatic cover-opening assembly, the cover-opening assembly being located between the cabinet body and the protective cover and cooperating with the discharge assembly for automatically opening the protective cover when the discharge assembly moves forward.

[0007] In one embodiment, the stepped visual discharge assembly includes a sliding frame slidably connected longitudinally within a cabinet. A mounting bracket is provided on the side of the sliding frame near each capacitor. Three protective shells are fixed longitudinally on the mounting bracket. Each protective shell contains a vertically slidably connected contact post, which is connected to the protective shell via a compression spring. A wire is connected to the top of each contact post, extending through the protective shell. A light bulb is mounted on each mounting bracket via a lamp holder. The wires of the contact posts located on the front and rear sides are connected to the live wire of the lamp holder, while the wire of the contact post located in the middle is connected to the neutral wire of the lamp holder.

[0008] In one embodiment, the one-way step locking assembly includes a one-way rack frame symmetrically fixed to the left and right inner walls of the cabinet. A guide bar is also fixed to the left and right inner walls of the cabinet, directly above the one-way rack frame. Each guide bar has a flap rotatably connected to its front end, and the bottom end of each flap rests on the corresponding one-way rack frame. Two symmetrically slidable limiting frames are vertically connected to the sliding frame. Each limiting frame is connected to the sliding frame via a return spring, which is wound around the corresponding limiting frame. Each limiting frame has a roller at its lower end, and the roller cooperates with the one-way rack frame, guide bar, and flap on the same side to form a guiding constraint area.

[0009] In one embodiment, the linkage automatic cover opening assembly includes two support frames fixed to the cabinet body, with the two support frames located between adjacent capacitors; two fixed frames symmetrically distributed on the left support frame are fixed to the left and right support frames, and a fixed frame is fixed to the right side of the right support frame; each protective cover is rotatably connected to its corresponding fixed frame, and a spur gear is coaxially fixed to the center of the rotating shaft of each protective cover; a lower pressure frame is vertically slidably connected between the left and right inner walls of the cabinet, and double-sided racks are vertically fixed to both sides of the lower pressure frame, with each double-sided rack passing through the corresponding support frame and meshing with all the spur gears on the same side; two guide frames are symmetrically fixed to the bottom of the sliding frame, and the front end of each guide frame is provided with a wedge-shaped inclined surface that cooperates with the lower pressure frame.

[0010] In one embodiment, the three protective shells on each mounting bracket are arranged non-equidistantly along the longitudinal direction, with the distance between the front protective shell and the middle protective shell being equal to the span between the first and last rows of terminals on the capacitor, and the distance between the middle protective shell and the rear protective shell being equal to the step distance between two adjacent terminals.

[0011] In one embodiment, each of the unidirectional racks is provided with uniformly distributed convex teeth along the longitudinal direction, and the rear side of each convex tooth is an inclined surface and the front side is a vertical surface.

[0012] In one embodiment, the lower pressure frame and the double-sided rack remain in a low position after the sliding frame is reset to the rear, so that the protective cover is kept in the fully open state; when the lower pressure frame is manually pushed upward, the lower pressure frame drives the double-sided rack to move upward, driving the spur gear to rotate in the opposite direction, so that all the protective covers are synchronously flipped downward to close.

[0013] Compared with the prior art, the present invention has the following advantages: The present invention uses a stepped visual discharge assembly, which uses a sliding frame to drive the contact posts to move step by step, automatically completing the two-by-two connection and discharge of the three terminals of the capacitor. The bulb, as a load indicator, lights up each time the discharge circuit is connected and automatically turns off when the discharge is complete, forming a visual feedback of "on-off" cycle. The operator only needs to observe the bulb on and off three times to know that the capacitor has been completely discharged, which completely avoids the problems of missed connection and incomplete discharge caused by human memory deviation or operational negligence, and significantly improves operational safety.

[0014] This invention utilizes a unidirectional step-locking component, employing the "rear-sloping, front-vertical" convex teeth of the unidirectional rack frame in conjunction with the limiting frame rollers, to ensure that the sliding frame can only advance one step at a time in one direction, preventing it from reversing midway. The operator must sequentially complete three preset discharge stations. Any accidental touch or slippage causing a backward pull is physically locked, ensuring the discharge circuit remains conductive until the charge is completely released. This mechanical forcing mechanism structurally eliminates operational errors of "giving up halfway," guaranteeing the absolute reliability of the discharge process.

[0015] The linkage-type automatic cover opening assembly utilizes the forward movement force of the sliding frame to drive all protective covers to open synchronously and automatically through the transmission of the guide frame, lower pressure frame, double-sided rack and pinion, and spur gear, achieving "one-button" opening and greatly improving operational efficiency. After the sliding frame resets, the protective covers remain open, providing ample operating space for capacitor replacement. After maintenance is completed, manually pushing up the lower pressure frame will simultaneously close all protective covers, restoring dustproof and contactproof protection. This "automatic opening, manual closing" design simplifies the operation process and ensures that the protective covers are closed after maintenance, eliminating safety hazards. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 This is a three-dimensional structural diagram of the cabinet, capacitor, and sliding frame components of the present invention.

[0018] Figure 3 This is a three-dimensional structural diagram of the sliding frame, mounting bracket, and light bulb components of the present invention.

[0019] Figure 4 This is a three-dimensional structural diagram of the components of the present invention, including the limiting frame, the return spring, and the one-way rack frame.

[0020] Figure 5 This is a three-dimensional structural diagram of the components of the present invention, including the pressure frame, double-sided rack, and protective cover.

[0021] In the diagram: 1. Cabinet, 11. Capacitor, 12. Cabinet door, 2. Sliding frame, 21. Protective shell, 22. Contact post, 23. Compression spring, 24. Wire, 25. Light bulb, 26. Mounting bracket, 3. Limiting frame, 31. Return spring, 32. One-way rack frame, 33. Guide bar, 34. Flip plate, 4. Guide frame, 41. Downward pressure frame, 411. Double-sided rack, 42. Support frame, 43. Fixing frame, 44. Spur gear, 45. Protective cover. Detailed Implementation

[0022] Although the invention may be described with respect to specific applications or industries, those skilled in the art will recognize its broader applicability. Those skilled in the art will understand that terms such as "above," "below," "upward," "downward," etc., are used to describe the drawings and not to indicate a limitation on the scope of the invention as defined by the appended claims. Any numerical designations such as "first" or "second" are merely illustrative and not intended to limit the scope of the invention in any way.

[0023] Example 1: A maintenance-friendly compensation distribution cabinet, such as Figures 1-3 As shown, the device includes a cabinet 1, on which a cabinet door 12 is rotatably connected to control its opening and closing. Several capacitors 11 are installed horizontally inside the cabinet 1; in this embodiment, three are preferred. Each capacitor 11 has three terminals arranged linearly at equal intervals along its top. To prevent electric shock and dust, each capacitor 11 is equipped with a protective cover 45 to completely cover all the terminals on its top. The cabinet 1 also contains a stepped, visible discharge assembly for the safe discharge of the capacitors 11.

[0024] The stepped visual discharge assembly includes a sliding frame 2 that is slidably connected to the cabinet 1 along the longitudinal direction. Each sliding frame 2 is provided with a mounting bracket 26 on the side near the capacitor 11, and three protective shells 21 are fixed on each mounting bracket 26 along the longitudinal direction.

[0025] The three protective shells 21 on each mounting bracket 26 are arranged non-equidistantly along the longitudinal direction: the distance between the front and middle protective shells 21 is set to be equal to the span between the first and last rows of terminals on the capacitor 11, while the distance between the middle and rear protective shells 21 is equal to the step distance between adjacent terminals. This specific spacing layout allows the three contact posts 22 to form three different pairwise pairing combinations with the terminals in sequence during the unidirectional movement of the sliding bracket 2.

[0026] Each protective shell 21 has a vertically sliding contact post 22 inside its cavity. The contact post 22 is connected to the protective shell 21 by a compression spring 23, so that the contact post 22 can remain in the retracted position when no external force is applied, and can slide upward and compress the spring 23 when compressed. The top of each contact post 22 is connected to a wire 24, which extends out of the protective shell 21.

[0027] Each mounting bracket 26 is also equipped with a light bulb 25 via a lamp holder, which has two terminals: a live wire and a neutral wire. The wires 24 on the contact posts 22 located on the front and rear sides are connected to the live wire terminal of the corresponding lamp holder, while the wires 24 on the contact post 22 located in the middle are connected to the neutral wire terminal of the corresponding lamp holder, thus forming a discharge circuit.

[0028] Before maintaining or replacing capacitor 11, first disconnect the main power supply to the distribution cabinet and all compensation circuit switches. Wait approximately five minutes to allow the capacitor 11 to undergo initial natural discharge using its internal resistance. Then, the operator opens cabinet door 12, lifts the protective cover 45 on top of each capacitor 11, exposing the wiring terminals. At this point, the sliding bracket 2 of the stepped visual discharge assembly is in its initial retracted position, the contact post 22 is extended under the action of the compression spring 23, and the bulb 25 is extinguished.

[0029] Pulling the sliding bracket 2 outward causes the mounting bracket 26 and its contact posts 22 and bulb 25 to move forward longitudinally. Due to the non-equidistant layout of the protective shell 21, each time the sliding bracket 2 moves a set step (i.e., the distance between adjacent terminals), the pairing relationship between the three contact posts 22 and the three terminals changes sequentially, thus achieving three pairs of discharge connections.

[0030] During the first discharge, the sliding frame 2 moves forward one step, and the frontmost contact post 22 contacts the frontmost row of terminals, while the middle contact post 22 contacts the back row of terminals. Since the front contact post 22 is connected to the live wire and the middle contact post 22 is connected to the neutral wire, the two form a circuit through the front and back rows of terminals, and capacitor 11 begins to discharge, illuminating bulb 25; after the discharge is complete, bulb 25 goes out.

[0031] During the second discharge, the circuit moves forward by a second step, with the middle contact post 22 contacting the middle terminal and the rear contact post 22 contacting the last row of terminals. The middle and rear contact posts 22 form a circuit through the middle and rear rows of terminals, causing the bulb 25 to light up again and then turn off.

[0032] The third discharge occurs, followed by a third step forward. The middle contact post 22 contacts the frontmost terminal block, and the rear contact post 22 contacts the middle terminal block. A circuit is formed through the front and middle rows of terminals, and the bulb 25 lights up for the third time before going out.

[0033] During the above process, when contact post 22 comes into contact with the terminal block, it is lifted up, compressing spring 23 to store force; after disengagement, the spring resets, causing contact post 22 to automatically retract. Through the three-step movement of sliding frame 2, the discharge assembly automatically completes the pairwise discharge of all three terminals of capacitor 11, ensuring that residual charge is completely released.

[0034] Only when the staff observes that bulb 25 has completed three complete cycles of "on → off → on → off → on → off" can it be confirmed that all possible potential combinations (front-back, middle-back, front-middle) between the three terminals inside capacitor 11 have been forcibly discharged through the load bulb 25. At this point, capacitor 11 is in an absolutely safe, de-energized state, and subsequent disassembly or maintenance work can be carried out.

[0035] The discharge operation of capacitor 11 relies entirely on manual memory and manual control of the sliding stroke, which has significant drawbacks: when manually pulling the sliding frame 2, it is difficult to accurately control the stopping position, which can easily lead to poor contact or misalignment between the contact post 22 and the terminal block, causing the discharge circuit to fail to conduct; during the discharge process (especially when the bulb 25 lights up to indicate discharge), if the operator accidentally touches or slips, causing the sliding frame 2 to accidentally retract, the contact post 22 will momentarily detach from the terminal block, resulting in interruption of discharge, incomplete release of charge, and leaving serious safety hazards.

[0036] Existing devices lack a mechanical limiting mechanism that forces operators to complete all three discharge strokes sequentially, in stages, and in one go, thus failing to physically prevent operational errors such as "missed connections" or "halfway completion." Therefore, a unidirectional stepping locking component needs to be designed to mechanically force the sliding frame 2 to advance only in one direction, preventing it from reversing before all three discharge actions are completed, thereby ensuring the integrity and safety of the discharge process.

[0037] like Figure 4As shown, specifically, the one-way step locking assembly includes one-way rack frames 32 symmetrically fixed to the left and right inner walls of the cabinet 1. Guide strips 33 are also fixed to the left and right inner walls of the cabinet 1, directly above the one-way rack frames 32. Each guide strip 33 has an inclined flap 34 rotatably connected to its front end, with the bottom end of the flap 34 naturally resting on the front end of the adjacent one-way rack frame 32. The one-way rack frame 32, flap 34, and guide strips 33 on the same side together form a longitudinal guiding constraint area, which is open at the rear and closed at the front by the flap 34.

[0038] The sliding frame 2 is vertically slidably connected to symmetrically distributed limiting frames 3. The limiting frames 3 are connected to the sliding frame 2 by return springs 31, and each return spring 31 is wound around the corresponding limiting frame 3. Each limiting frame 3 has a roller at its lower end.

[0039] In the initial static state, the roller at the lower end of the restraint frame 3 is located directly above the rear end face of the unidirectional rack frame 32 and before the starting position of the rear end of the guide bar 33, and has not yet entered the aforementioned longitudinal guide constraint area.

[0040] As the sliding frame 2 begins to move forward, the limiting frame 3 moves forward synchronously, and the roller at its lower end slides into the guide constraint area: the bottom of the roller first contacts the inclined surface of the convex tooth at the rear end of the one-way rack frame 32, and the top enters the space below the guide bar 33. As the stroke continues, the roller is constrained between the convex tooth of the one-way rack frame 32 and the guide bar 33, and moves back and forth in a step-by-step manner along the trajectory.

[0041] The convex teeth on the one-way rack and pinion 32 are designed as "rear inclined, front vertical" (the rear side is an inclined surface, and the front side is a vertical surface). When the sliding frame 2 moves forward, the rollers press against the inclined surface of the convex teeth, pushing the limiting frame 3 to float upward relative to the sliding frame 2, compressing the return spring 31, and falling down under the action of the spring after passing the convex teeth, achieving a step-by-step forward movement. This damping sensation helps the operator to accurately control the contact post 22 to stop at the terminal block position.

[0042] If, during the discharge process (when the roller is located between the two protruding teeth or stuck in front of the protruding teeth), the operator accidentally pushes the sliding frame 2 backward, the vertical surface of the protruding teeth will firmly block the roller, physically locking the sliding frame 2 and preventing it from moving backward. This ensures that once the contact post 22 contacts the terminal block and begins to discharge, it will never disengage due to misoperation, completely eliminating the risk of discharge interruption.

[0043] Due to the uniform distribution of the convex teeth and the unidirectional locking characteristic, the operator must apply sufficient force to overcome the spring resistance and continuously pull the sliding frame 2 forward, sequentially passing through three preset discharge stations (first-to-last pairing, middle-to-rear pairing, and front-to-middle pairing). Any attempt to reverse midway will be blocked by the mechanical structure, thus forcing the operator to complete all three discharge processes.

[0044] When the sliding frame 2 drives the limiting frame 3 to the end point (completing the third discharge), the rollers on the limiting frame 3 will strike and push open the inclined flap 34, causing it to flip upwards and open. The rollers then slide along the inclined surface of the flap 34, being forcibly lifted to a position above the tip of the convex tooth, thereby disengaging from the meshing constraint with the one-way rack frame 32. At this time, the flap 34 automatically resets and closes under the action of gravity.

[0045] After the discharge is complete, the operator can push the sliding frame 2 backward. At this time, the rollers of the limiting frame 3 remain in the raised state, and slide along the inclined upper surface of the flip plate 34 and the top surface of the guide bar 33, passing over the entire one-way rack frame 32 area below from a high position. After the rollers have completely passed the guide bar 33 and returned to the starting position, the limiting frame 3 falls down and resets under the action of the return spring 31, ready for the next operation.

[0046] Example 2: In existing compensation distribution cabinets, the terminals of capacitor 11 are usually equipped with protective covers 45 to prevent dust and contact. However, this has the following shortcomings in discharge and maintenance operations: First, the opening efficiency is low. Relying on manual opening of the protective cover 45 of each capacitor 11 is time-consuming and labor-intensive, seriously slowing down the maintenance progress. Second, the maintenance space is limited. If the sliding frame 2 automatically closes the cover upon resetting, it will obstruct the process of replacing capacitor 11, forcing operators to repeatedly open and close or forcibly support the protective cover 45, which can easily damage the equipment. Third, safety protection is lagging behind. There is a lack of a linkage mechanism that can both achieve "automatic opening during discharge" to improve efficiency and keep the protective cover 45 open during maintenance and then easily close it manually after maintenance. If the protective cover 45 is forgotten to be closed, long-term openness can easily lead to dust accumulation or the risk of accidental contact by personnel.

[0047] Therefore, it is necessary to design a linkage-type automatic cover opening component that uses the forward movement force of the sliding frame 2 to automatically and synchronously open all protective covers 45 for discharge; after the sliding frame 2 is reset, the protective covers 45 can be locked in the open state to reserve maintenance space. After the capacitor 11 is replaced, all protective covers 45 can be closed synchronously through simple manual operation to restore safety protection.

[0048] like Figure 5 As shown, specifically, the linkage-type automatic cover opening assembly includes two support frames 42 symmetrically fixed to the inner cavity of the cabinet 1, spaced apart between adjacent capacitors 11. Two symmetrically distributed fixing frames 43 are fixed to the left support frame 42, respectively supporting the protective covers 45 of the capacitors 11 on its left and middle sides; the right support frame 42 has only one fixing frame 43 fixed to its right side, supporting the protective cover 45 of the capacitor 11 on its right side. Each protective cover 45 is rotatably connected to the adjacent fixing frame 43, and a spur gear 44 is coaxially fixed to the center of the rotating shaft of each protective cover 45.

[0049] A downward pressure frame 41 is vertically slidably connected between the left and right inner walls of the cabinet 1, and double-sided racks 411 are vertically fixed to its left and right sides. Each double-sided rack 411 passes through the corresponding support frame 42 area and meshes with all spur gears 44 on the same side for transmission. A guide frame 4 with a wedge-shaped inclined surface is symmetrically fixed to the bottom of the sliding frame 2.

[0050] When the sliding bracket 2 is pulled forward, the bottom guide bracket 4 moves forward simultaneously. The wedge-shaped inclined surface at the front end of the guide bracket 4 gradually abuts against the lower pressure bracket 41, forcibly pressing it down. The lower pressure bracket 41 drives the double-sided racks 411 on both sides to move downward, converting linear motion into rotational motion through gear meshing, driving all protective covers 45 to flip upward and open simultaneously. At this time, the wiring terminals are completely exposed, and the contact posts 22 can be successfully connected for discharge. This process achieves "one-button" automatic opening, greatly improving operating efficiency.

[0051] After the discharge is complete, the sliding frame 2 is pushed back to reset, and the guide frame 4 retracts, no longer applying pressure to the lower pressure frame 41. At this time, the lower pressure frame 41 and the double-sided rack 411 remain stationary in a low position without external interference, so that all protective covers 45 remain in the fully open state.

[0052] This state provides ample operating space for the disassembly, replacement, and internal maintenance of capacitor 11, preventing the protective cover 45 from automatically rebounding and obstructing the view or hindering tool operation, thus ensuring smooth maintenance work.

[0053] After capacitor 11 has been replaced or maintained, the operator manually pushes the lower pressure frame 41 upward. The lower pressure frame 41 drives the double-sided rack 411 to reset upward, and drives the spur gear 44 to rotate in the opposite direction, causing all protective covers 45 to flip downward and close simultaneously, tightly covering the wiring terminals.

[0054] This "automatic opening, manual closing" logic not only solves the problem of cumbersome opening of the cover by using mechanical linkage, but also cleverly leaves a time window for maintenance. Finally, through a forced manual reset action, it ensures that the equipment will be restored to the protective state before being put into operation, eliminating the safety hazards caused by forgetting to close it.

[0055] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A maintenance-friendly compensation distribution cabinet, comprising a cabinet body (1), a cabinet door (12) rotatably connected to the cabinet body (1), three capacitors (11) installed horizontally inside the cabinet body (1), each capacitor (11) having three evenly distributed terminals on its top along the longitudinal direction, and each capacitor (11) having a protective cover (45) on its top for covering all the terminals on its top; characterized in that, It also includes: a stepped visual discharge assembly, which is slidably connected in the cabinet (1) along the longitudinal direction and is used to discharge the capacitor (11) in steps; a unidirectional step locking assembly, which is located between the cabinet (1) and the discharge assembly and is used to force the discharge assembly to move in one direction and prevent it from retreating midway; and a linkage automatic cover opening assembly, which is located between the cabinet (1) and the protective cover (45) and is driven to cooperate with the discharge assembly and is used to automatically open the protective cover (45) when the discharge assembly moves forward.

2. The easy-to-maintain compensation distribution cabinet as described in claim 1, characterized in that, The stepped visual discharge assembly includes a sliding frame (2) that is slidably connected to the cabinet (1) along the longitudinal direction. The sliding frame (2) is provided with a mounting bracket (26) on one side near each capacitor (11). Three protective shells (21) are fixed on the mounting bracket (26) along the longitudinal direction. Each protective shell (21) has a contact post (22) that is slidably connected vertically. The contact post (22) is connected to the protective shell (21) by a compression spring (23). The top of each contact post (22) is connected to a wire (24). The wire (24) passes through the protective shell (21). Each mounting bracket (26) has a bulb (25) installed on it through a lamp holder. The wires (24) of the contact posts (22) located on the front and rear sides are connected to the live wire end of the lamp holder. The wires (24) of the contact post (22) located in the middle are connected to the neutral wire end of the lamp holder.

3. The easy-to-maintain compensation distribution cabinet as described in claim 2, characterized in that, The one-way step locking assembly includes a one-way rack frame (32) symmetrically fixed to the left and right inner walls of the cabinet (1). A guide strip (33) is also fixed to the left and right inner walls of the cabinet (1) directly above the one-way rack frame (32). Each guide strip (33) has a flap (34) rotatably connected to its front end. The bottom end of each flap (34) rests on the corresponding one-way rack frame (32). Two left and right symmetrical restriction frames (3) are vertically slidably connected to the sliding frame (2). Each restriction frame (3) is connected to the sliding frame (2) by a return spring (31). Each return spring (31) is wrapped around the corresponding restriction frame (3). Each restriction frame (3) has a roller at its lower end. The roller cooperates with the guide constraint area formed by the one-way rack frame (32), guide strip (33) and flap (34) on the same side.

4. The easy-to-maintain compensation distribution cabinet as described in claim 3, characterized in that, The linkage automatic opening assembly includes two support frames (42) fixed inside the cabinet (1), with the two support frames (42) located between adjacent capacitors (11); two fixed frames (43) are fixedly attached to the left support frame (42) and symmetrically distributed on the left and right sides, and a fixed frame (43) is fixedly attached to the right side of the right support frame (42); each protective cover (45) is rotatably connected to the corresponding fixed frame (43), and the center of the rotating shaft of each protective cover (45) is coaxially fixed. There are spur gears (44); a lower pressure frame (41) is vertically slidably connected between the left and right inner walls of the cabinet (1). Double-sided racks (411) are vertically fixed on both sides of the lower pressure frame (41). Each double-sided rack (411) is inserted into the corresponding support frame (42) and meshes with all the spur gears (44) on the same side; two guide frames (4) are symmetrically fixed at the bottom of the sliding frame (2). Each guide frame (4) has a wedge-shaped inclined surface that cooperates with the lower pressure frame (41) at its front end.

5. A maintenance-friendly compensation distribution cabinet as described in claim 2, characterized in that, The three protective shells (21) on each of the mounting brackets (26) are arranged non-equidistantly along the longitudinal direction. The distance between the front protective shell (21) and the middle protective shell (21) is equal to the span between the first and last rows of terminals on the capacitor (11). The distance between the middle protective shell (21) and the rear protective shell (21) is equal to the step distance between two adjacent terminals.

6. The easy-to-maintain compensation distribution cabinet as described in claim 3, characterized in that, Each of the unidirectional racks (32) has uniformly distributed convex teeth along the longitudinal direction, with the rear side of each convex tooth being an inclined surface and the front side being a vertical surface.

7. The easy-to-maintain compensation distribution cabinet as described in claim 4, characterized in that, The lower pressure frame (41) and double-sided rack (411) remain in a low position after the sliding frame (2) is reset to the rear, so that the protective cover (45) is kept in the fully open state; when the lower pressure frame (41) is manually pushed upward, the lower pressure frame (41) drives the double-sided rack (411) to move upward, driving the spur gear (44) to rotate in the opposite direction, so that all the protective covers (45) are synchronously flipped downward to close.

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