A safety protection device of a ring main unit

Abstract

The utility model discloses a safety device of ring main unit, include: ring main unit subassembly, including the cabinet body and the front end symmetrical rotation setting's cabinet door, the cabinet body back is equipped with the insulating box, the cabinet body inside below is equipped with the insulating plate, the cabinet door realizes the synchronous rotation through synchronous mechanism and the cabinet body connection and opens, locking mechanism, fixed in the guide frame of cabinet body inside below, with the gear of fixed in the outer side of rotation axis and the abutment plate of fixed in the insulating box corresponding cabinet body one end, the inside movable setting of guide frame has the square frame, one side of square frame inner wall is equipped with the tooth, the tail of square frame is fixedly arranged with the guide column, be equipped with the spring between square frame and the abutment plate, the terminal of guide column is fixedly arranged with first electromagnet. The utility model discloses ring main unit subassembly and locking mechanism through the setting, and this ring main unit can only carry out maintenance operation under the power -off state, fundamentally eliminates the security risk of electrified mistake open door.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, and in particular to a safety protection device for a ring main unit. Background Technology

[0002] Ring main units (RMS), as key node equipment in urban power distribution networks, are complete power distribution devices that compactly integrate high-voltage switchgear, transformers, protection devices, and auxiliary components within a closed metal cabinet. Their core function is to connect multiple power sources or distribution lines into a ring network through a "ring network connection," enabling flexible power distribution and bidirectional power supply. When a fault occurs in any line or section of the ring network, the fault point can be quickly isolated through internal high-voltage load switches, circuit breakers, and other components, and power can be immediately switched to other normal lines, significantly shortening power outage time and ensuring power supply reliability and continuity. Furthermore, RMS units are characterized by their small size, compact structure, flexible installation (allowing them to be installed deep within load centers such as residential areas and commercial districts), high safety protection levels (dustproof, waterproof, and shockproof), and ease of automated monitoring (achieving "three-remote" functions with DTU terminals). They are widely used in urban streets, industrial parks, residential communities, and other scenarios, and are an indispensable infrastructure in the construction of modern smart power distribution networks, undertaking multiple tasks such as power distribution, fault isolation, line protection, and real-time monitoring of operational status.

[0003] When maintenance is required inside the ring main unit due to short circuits, arcing faults, or other reasons, workers often directly open the cabinet door for inspection. However, since residual charges or incompletely disconnected power may still exist inside the cabinet, once the door is opened, the arcing energy will be released instantly, which can easily cause electric shock or arc burns, seriously threatening the personal safety of operators. Therefore, improvements are needed. Utility Model Content

[0004] One objective of this invention is to provide a safety protection device for ring main units. This invention addresses the problem mentioned in the background: when maintenance is required inside the ring main unit due to short circuits, arcing faults, or other reasons, workers often directly open the cabinet door for inspection. However, because residual charges or incompletely disconnected power may still exist inside the cabinet, once the door is opened, the arc energy will be released instantly, easily causing electric shock or arc burns, seriously threatening the personal safety of operators.

[0005] A safety protection device for a ring main unit according to an embodiment of the present utility model includes: The ring main unit assembly includes a cabinet body and cabinet doors that are symmetrically rotated at the front end. An insulating box is provided on the back of the cabinet body, and an insulating plate is installed at the bottom inside the cabinet body. The cabinet doors are connected to the cabinet body through a synchronization mechanism to achieve synchronous rotation when opened. The locking mechanism consists of a guide frame fixed inside the lower part of the cabinet, a gear fixed to the outside of the rotating shaft, and an abutment plate fixed to one end of the cabinet corresponding to the insulating box. A square frame is movably arranged inside the guide frame. Teeth are provided on one side of the inner wall of the square frame. A guide post is fixedly arranged at the tail end of the square frame. A spring is provided between the square frame and the abutment plate. A first electromagnet is fixedly arranged at the end of the guide post. A second electromagnet is installed inside the insulating box.

[0006] Preferably, an observation window, a handle, and a lock cylinder are installed on one side of the cabinet door.

[0007] Preferably, the synchronization mechanism is installed between the bottom of the insulating plate and the cabinet.

[0008] Preferably, the synchronization mechanism includes a push-pull rod that rotates within the cabinet via a rotating shaft, and a rotating seat that is fixed to the back of the cabinet door by bolts. A V-shaped connecting rod is rotatably arranged between the push-pull rod and the two rotating seats.

[0009] Preferably, the V-shaped connecting rod consists of two connecting rods, wherein the two connecting rods are rotatably connected.

[0010] Preferably, the guide frame is located outside the rotating shaft, the square frame is located outside the gear, and the teeth on the inner wall of the square frame correspond to those on the gear.

[0011] Preferably, the guide post is movably disposed inside the contact plate, and the spring is sleeved on the outside of the guide post.

[0012] Preferably, the first electromagnet and the second electromagnet are magnetically connected, and the second electromagnet is connected to the switch connector in the ring main unit assembly.

[0013] The beneficial effects of this utility model are: 1. This utility model, through its ring main unit components and locking mechanism, effectively avoids the problem of electric shock accidents caused by the release of arc energy due to accidental opening of the cabinet door. When the ring main unit is energized, the second electromagnet is energized and generates a magnetic attraction between it and the first electromagnet, causing the guide column to drive the square frame to move along the guide frame. The teeth on the inner wall of the square frame mesh with the gear, thereby restricting the rotation of the shaft and locking the cabinet door so that it cannot be opened. When the ring main unit is de-energized, the second electromagnet loses power, the magnetic attraction disappears, the spring returns to its original position, pushing the square frame away from the gear and releasing the lock on the shaft. At this time, the cabinet door can be opened normally. Thus, maintenance operations can only be performed when the power is off, fundamentally eliminating the safety hazard of accidental opening of the door while energized. 2. This utility model, through its synchronization mechanism, enables the V-shaped connecting rod to move by rotating the push-pull rod when the cabinet door needs to be opened. The V-shaped connecting rod consists of two rotatably connected rods, with its two ends hinged to the push-pull rod and the rotating seats on the back of the two cabinet doors, respectively. This allows the two cabinet doors to rotate and open synchronously. When the locking mechanism is activated, the rotating shaft is locked. The synchronization mechanism ensures that both cabinet doors are locked simultaneously, avoiding the risk of localized arcing or human error that may result from accidental opening of one side of the door. This provides comprehensive protection during maintenance. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a three-dimensional structural diagram of one side of the safety protection device for a ring main unit proposed in this utility model; Figure 2 This is a three-dimensional structural diagram of the other side of a safety protection device for a ring main unit proposed in this utility model. Figure 3 This is a schematic diagram of the internal structure of a safety protection device for a ring main unit proposed in this utility model; Figure 4 This is a schematic diagram of the contact plate structure of a safety protection device for a ring main unit proposed in this utility model; Figure 5 This is a schematic diagram of the linkage structure of a safety protection device for a ring main unit proposed in this utility model; Figure 6 This is a schematic diagram of the gear structure of a safety protection device for a ring main unit proposed in this utility model; In the diagram: 1. Ring main unit assembly; 101. Cabinet body; 102. Cabinet door; 103. Observation window; 104. Handle; 105. Lock cylinder; 106. Insulation box; 107. Switch connector; 108. Insulation plate; 2. Synchronization mechanism; 201. Rotating shaft; 202. Push-pull rod; 203. Rotating seat; 204. V-shaped connecting rod; 3. Locking mechanism; 301. Guide frame; 302. Square frame; 303. Tooth; 304. Gear; 305. Guide column; 306. Contact plate; 307. Spring; 308. First electromagnet; 309. Second electromagnet. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0016] refer to Figures 1-6A safety protection device for a ring main unit, comprising: The ring main unit component 1 includes a cabinet body 101 and cabinet doors 102 that are symmetrically rotated at the front end. An insulating box 106 is provided on the back of the cabinet body 101. An insulating plate 108 is installed at the bottom inside the cabinet body 101. The cabinet doors 102 are connected to the cabinet body 101 through a synchronization mechanism 2 to achieve synchronous rotation when opened. The synchronization mechanism 2 includes a push-pull rod 202 that rotates inside the cabinet 101 via a rotating shaft 201, and a rotating seat 203 that is fixedly installed on the back of the cabinet door 102 by bolts. A V-shaped connecting rod 204 is rotatably arranged between the push-pull rod 202 and the two rotating seats 203. When cabinet door 102 needs to be opened, the V-shaped connecting rod 204 is driven to move by rotating the push-pull rod 202. The V-shaped connecting rod 204 consists of two rotatably connected connecting rods, and its two ends are respectively hinged to the push-pull rod 202 and the rotating seat 203 on the back of the two cabinet doors 102, thereby realizing the synchronous rotation and opening of the two cabinet doors 102. When the locking mechanism 3 is activated, the rotating shaft 201 is locked. The synchronization mechanism 2 ensures that the two cabinet doors 102 are locked at the same time, avoiding the risk of local arc spray or personnel misoperation that may be caused by accidental opening of one side door. The locking mechanism 3 consists of a guide frame 301 fixed inside the lower part of the cabinet 101, a gear 304 fixed to the outside of the rotating shaft 201, and an abutment plate 306 fixed to the insulating box 106 at one end of the cabinet 101. A square frame 302 is movably arranged inside the guide frame 301. Teeth 303 are provided on one side of the inner wall of the square frame 302. A guide post 305 is fixedly arranged at the tail end of the square frame 302. A spring 307 is provided between the square frame 302 and the abutment plate 306. A first electromagnet 308 is fixedly arranged at the end of the guide post 305. A second electromagnet 309 is installed inside the insulating box 106. When the ring main unit is energized, the second electromagnet 309 is energized, generating a magnetic attraction with the first electromagnet 308. This causes the guide column 305 to move the square frame 302 along the guide frame 301. The teeth 303 on the inner wall of the square frame 302 mesh with the gear 304, thereby restricting the rotation of the rotating shaft 201 and locking the cabinet door 102 so that it cannot be opened. When the ring main unit is de-energized, the second electromagnet 309 loses power, the magnetic attraction disappears, the spring 307 resets, and pushes the square frame 302 away from the gear 304, releasing the lock on the rotating shaft 201. Only then can the cabinet door 102 be opened normally. Thus, maintenance operations can only be performed when the power is off, fundamentally eliminating the safety hazard of accidentally opening the door while energized.

[0017] Example 1: An observation window 103, a handle 104, and a lock cylinder 105 are respectively installed on one side of the cabinet door 102, which allows the operator to observe the internal status without opening the cabinet door 102. At the same time, the handle 104 and the lock cylinder 105 realize the opening and locking of the cabinet door 102. The synchronization mechanism 2 is installed between the bottom of the insulating plate 108 and the cabinet body 101. The V-shaped connecting rod 204 consists of two connecting rods, which are rotatably set to realize the synchronous opening or closing of the two cabinet doors 102, avoiding premature opening of one side of the cabinet door 102 and exposing the internal live parts, thus improving the operational safety during maintenance.

[0018] Example 2: The guide frame 301 is located outside the rotating shaft 201, and the square frame 302 is located outside the gear 304. The teeth 303 on the inner wall of the square frame 302 correspond to the gear 304 and are used to control the rotation state of the rotating shaft 201. The guide post 305 is located inside the contact plate 306 and is movably set. The spring 307 is sleeved on the outside of the guide post 305 and is used to reset the square frame 302. The first electromagnet 308 and the second electromagnet 309 are magnetically connected. The second electromagnet 309 is connected to the switch connector 107 in the ring main unit assembly 1. When energized, the first electromagnet 308 and the second electromagnet 309 attract and lock the cabinet door 102. After the power is cut off, the spring 307 resets and releases the lock, ensuring that the cabinet door 102 can only be opened when the power is off, effectively preventing electric shock accidents caused by misoperation.

[0019] Working principle: When the ring main unit is energized, the second electromagnet 309 is energized, generating a magnetic attraction with the first electromagnet 308. This causes the guide post 305 to move the square frame 302 along the guide frame 301. The teeth 303 on the inner wall of the square frame 302 mesh with the gear 304, thereby restricting the rotation of the rotating shaft 201 and locking the cabinet door 102 so it cannot be opened. When the ring main unit is de-energized, the second electromagnet 309 loses power, the magnetic attraction disappears, the spring 307 resets, pushing the square frame 302 away from the gear 304, releasing the lock on the rotating shaft 201. At this time, the cabinet door 102 can be opened normally. When cabinet door 102 needs to be opened, the V-shaped connecting rod 204 is driven to move by rotating the push-pull rod 202. The V-shaped connecting rod 204 consists of two rotatably connected rods, and its two ends are respectively hinged to the push-pull rod 202 and the rotating seat 203 on the back of the two cabinet doors 102, thereby realizing the synchronous rotation and opening of the two cabinet doors 102. When the locking mechanism 3 is activated, the rotating shaft 201 is locked, and the synchronization mechanism 2 ensures that the two cabinet doors 102 are locked at the same time, avoiding the risk of local arcing or personnel misoperation that may be caused by accidental opening of one side door, and fundamentally eliminating the safety hazard of accidental opening of the door while it is energized.

[0020] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A safety protection device for a ring main unit, characterized in that, include: The ring main unit assembly (1) includes a cabinet body (101) and cabinet doors (102) symmetrically rotated at the front end. An insulating box (106) is provided on the back of the cabinet body (101). An insulating plate (108) is installed at the bottom inside the cabinet body (101). The cabinet doors (102) are connected to the cabinet body (101) through a synchronization mechanism (2) to achieve synchronous rotation when opened. The locking mechanism (3) consists of a guide frame (301) fixed inside the lower part of the cabinet (101), a gear (304) fixed to the outside of the rotating shaft (201), and an abutment plate (306) fixed to the insulating box (106) at one end of the cabinet (101). A square frame (302) is movably arranged inside the guide frame (301). Teeth (303) are provided on one side of the inner wall of the square frame (302). A guide post (305) is fixedly arranged at the tail end of the square frame (302). A spring (307) is provided between the square frame (302) and the abutment plate (306). A first electromagnet (308) is fixedly arranged at the end of the guide post (305). A second electromagnet (309) is installed inside the insulating box (106).

2. The safety protection device for a ring main unit according to claim 1, characterized in that, The cabinet door (102) is equipped with an observation window (103), a handle (104) and a lock cylinder (105) on one side.

3. The safety protection device for a ring main unit according to claim 1, characterized in that, The synchronization mechanism (2) is installed between the bottom of the insulating plate (108) and the cabinet (101).

4. A safety protection device for a ring main unit according to claim 3, characterized in that, The synchronization mechanism (2) includes a push-pull rod (202) that rotates inside the cabinet (101) via a rotating shaft (201), and a rotating seat (203) that is fixed to the back of the cabinet door (102) by bolts. A V-shaped connecting rod (204) is rotatably arranged between the push-pull rod (202) and the two rotating seats (203).

5. A safety protection device for a ring main unit according to claim 4, characterized in that, The V-shaped connecting rod (204) consists of two connecting rods, which are rotatably connected.

6. A safety protection device for a ring main unit according to claim 1, characterized in that, The guide frame (301) is located outside the rotating shaft (201), the square frame (302) is located outside the gear (304), and the teeth (303) on the inner wall of the square frame (302) correspond to those of the gear (304).

7. A safety protection device for a ring main unit according to claim 1, characterized in that, The guide post (305) is movably disposed inside the contact plate (306), and the spring (307) is sleeved on the outside of the guide post (305).

8. A safety protection device for a ring main unit according to claim 1, characterized in that, The first electromagnet (308) and the second electromagnet (309) are magnetically connected, and the second electromagnet (309) is connected to the switch connector (107) in the ring main unit assembly (1).

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