Mechanical interlocking device for preventing misoperation of 12kV solid insulation ring main unit

Abstract

The utility model discloses a mechanical interlocking device for preventing misoperation of a 12kV solid ring main unit, which belongs to the technical field of electromechanical equipment and comprises a grounding interlocking device and an opening mechanism locking device. The grounding interlocking device comprises a grounding chain piece, a connecting column, an opening blocking piece, a support, a bolt, a spring, an interlocking plug, a cable chamber door interlocking piece and a cable chamber door. The switching-off mechanism locking device comprises a switching-off button locking connecting piece, a fixing bolt, a supporting ring, a circuit breaker mounting plate and a switching-off button. The interlocking device is small and exquisite in structure, simple to install and convenient to use, interlocking of the grounding switch and the cable chamber door and interlocking of the cable chamber door and the breaker opening mechanism are achieved, and the safety of the operation and maintenance process is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of interlocking devices, in particular to a mechanical interlocking device for preventing misoperation of a 12kV solid insulation ring network cabinet. Background Art

[0002] The main function of the solid insulation ring main unit is to open and close, control and protect the electrical equipment in the process of power generation, transmission, distribution and energy conversion in the power system through the switches inside it. The interlocking device is a device designed to ensure that the switch device or its components operate in a specified order or to prevent malfunction.

[0003] The existing solid-insulated ring main unit uses solid materials to fully cover and seal the disconnector, arc extinguishing chamber, circuit breaker and other related components. While improving the insulation performance and the ability to resist external environmental interference, it makes the overall structure of the solid-insulated ring main unit more complex and the volume larger, and also greatly increases the difficulty of installing the mechanical interlocking device therein. Utility Model Content

[0004] The utility model aims to provide a mechanical interlocking device for preventing misoperation of a 12kV solid insulation ring network cabinet, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a mechanical interlocking device for preventing misoperation of a 12kV solid insulated ring network cabinet, comprising a grounding interlocking device and a switch-off mechanism locking device. The grounding interlocking device comprises a grounding chain, a connecting column, a switch-off baffle, a bracket, a latch, a spring, an interlocking plug, a cable room door interlocking member, and a cable room door. The connecting column is provided with a through hole A near one end thereof, the end with the hole A is the tail end, and the other end is the head end; the grounding chain is fixed at the head end of the connecting column; the switch-disconnecting baffle is fixed below the grounding chain and above the bracket; the bracket is a closed-loop frame structure, located near the tail end of the connecting column, the connecting column passes through the bracket, and the connecting column and the bracket are not fixed, the bottom of the bracket is fixedly connected to the bottom plate of the front middle beam of the mechanism room, and the hole A is in the frame of the bracket; the spring is placed inside the bracket, and the connecting column passes through the spring; the latch fixes the upper position of the spring through the hole A; the interlocking plug is fixedly installed at the tail end of the connecting column; the cable room door interlocking piece is fixed on the upper side of the cable room door, and a notch is provided on it, which can be inserted into the gap between the interlocking plug and the connecting column.

[0006] The opening mechanism locking device comprises: an opening button locking link, a fixing pin, a support ring, a circuit breaker mounting plate, and an opening button. The lower end of the opening button locking link is fixed to the grounding chain plate, and is fixed to the circuit breaker mounting plate through the fixing pin and the support ring. There are two slots on the vertical surface of the opening button locking link, which restrict the opening button locking link to limited movement in the vertical direction.

[0007] Preferably, the connecting column is a rectangular parallelepiped with a square cross-section, the head end and the tail end are flat cross-sections, the hole A thereon is a circular hole, and a threaded hole is opened in the center of the tail end.

[0008] Preferably, the grounding chain is a three-dimensional L-shaped plate, whose horizontal part is provided with a square hole B of the same size as the cross-section of the connecting column. The grounding chain is welded and fixed to the head end of the connecting column through the square hole B, and its upper surface is flush with the plane of the head end of the connecting column.

[0009] Preferably, the gate-opening baffle is a flat L-shaped plate, one side of which is provided with a square hole C of the same size as the cross section of the connecting column, and the connecting column passes through the square hole C;

[0010] Preferably, the bracket is a closed-loop square frame structure, with a through square hole D in the center of the upper and lower surfaces, the square hole D is equal to the cross-section of the connecting column, the connecting column passes through the square hole D, and the hole A of the connecting column is located in the bracket near the top of the bracket;

[0011] Preferably, the interlocking plug is connected to the connecting column by threads;

[0012] Preferably, the cable room door interlock is a U-shaped frame structure, and the notch is located at the center of one side of its planar portion.

[0013] Preferably, the lower end of the opening button locking link is fixed to the lower surface of the flat part of the grounding chain piece away from the vertical surface, and the upper part thereof is provided with a groove capable of clamping the opening button;

[0014] Through the above design scheme, the present invention can bring the following beneficial effects: compact structure, simple installation, easy use, realize the interlocking of the grounding switch and the cable room door and the interlocking of the cable room door and the circuit breaker opening mechanism, ensure that the switch device or its components operate in a prescribed order or prevent accidents due to false operation, and improve the safety of the operation and maintenance process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0016] Figure 1 The utility model is a partial structural schematic diagram of a grounding interlocking device of a mechanical interlocking device for preventing misoperation of a 12kV solid insulation ring network cabinet.

[0017] Figure 2 The utility model is a structural schematic diagram of a mechanical interlocking device for preventing misoperation of a 12kV solid insulation ring network cabinet.

[0018] Figure 3 The utility model is a schematic diagram of a cable room door of a mechanical interlocking device for preventing misoperation of a 12kV solid insulation ring network cabinet.

[0019] Figure 4 It is a schematic diagram of the open state of the grounding switch and the closed state of the isolating switch in the embodiment of the utility model.

[0020] Figure 5 It is a schematic diagram of the closed state of the grounding switch and the open state of the isolating switch in the embodiment of the utility model.

[0021] Figure 6 It is a schematic diagram of the open state of the grounding switch and the disconnecting switch in the embodiment of the utility model.

[0022] Figure 7 This is a schematic diagram of the circuit breaker closing state in the embodiment of the utility model.

[0023] Figure 8 It is a schematic diagram of the circuit breaker opening state in the embodiment of the utility model.

[0024] In the figure: 1-opening button locking link, 2-grounding chain plate, 3-connecting column, 4-opening baffle, 5-bracket, 6-latch, 7-spring, 8-interlocking plug, 9-fixed latch, 10-support ring, 11-circuit breaker mounting plate, 12-opening button, 13-grounding mechanism auxiliary crank arm, 14-front middle beam bottom plate of mechanism room, 15-cable room door interlock, 16-cable room door, 17-closing button, 18-opening mechanism auxiliary crank arm, 19-opening baffle rod, 20-grounding mechanism operating shaft, 21-isolating mechanism operating shaft. DETAILED DESCRIPTION

[0025] The technical solution of the utility model will be clearly and completely described below through specific examples. Those skilled in the art can easily understand other advantages and effects of the utility model from the content disclosed in this specification. The utility model can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the utility model. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0026] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0027] All directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, horizontal, vertical...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0028] Due to installation errors and other reasons, the parallel relationship referred to in the embodiments of the present invention may actually be an approximately parallel relationship, and the vertical relationship may actually be an approximately vertical relationship.

[0029] Example

[0030] like Figure 1 , Figure 2 The grounding interlocking device shown in the figure includes a grounding chain 2, a connecting column 3, a disconnecting baffle 4, a bracket 5, a latch 6, a spring 7, an interlocking plug 8, a cable room door interlock 15, and a cable room door 16. The connecting column 3 is a rectangular parallelepiped with a square cross-section, a flat section at the head end, a through circular hole A near the tail end, and a threaded hole at the center of the tail end; the grounding chain 2 is a three-dimensional L-shaped plate, a square hole B equal to the cross-section of the connecting column 3 is opened in its horizontal part, and the grounding chain 2 is fixed to the head end of the connecting column 3 through the square hole B, and its upper surface is flush with the plane of the head end of the connecting column 3; the disconnecting baffle 4 is a flat L-shaped plate, a square hole C equal to the cross-section of the connecting column 3 is opened on one side, the connecting column 3 passes through the square hole C, and the disconnecting baffle 4 is fixed below the grounding chain 2 through the square hole C; the bracket 5 is a closed-loop square frame structure, located near the tail end of the connecting column 3 The position of the bracket 5 is provided with a through square hole D in the center of the upper and lower surfaces, the connecting column 3 passes through the square hole D, and the circular hole A of the connecting column 3 is located in the bracket 5 near the top of the bracket 5, and the bottom of the bracket is fixedly connected to the bottom plate 14 of the front middle beam of the mechanism room; the spring 7 is placed inside the bracket 5, and the connecting column 3 passes through the center of the spring 7; the latch 6 fixes the upper position of the spring 7 through the circular hole A; the interlocking plug 8 is installed at the tail end of the connecting column 3 and is connected to the connecting column 3 by threads; the cable room door interlocking piece 15 is a U-shaped frame structure, fixed on the upper side of the cable room door 16, and a notch is provided in the center of one side of the plane part, which can be inserted into the gap between the interlocking plug 8 and the connecting column 3.

[0031] like Figure 2As shown, the opening mechanism locking device comprises: an opening button locking link 1, a fixing pin 9, a support ring 10, a circuit breaker mounting plate 11, and an opening button 12. The lower end of the opening button locking link 1 is fixed to the lower surface of the plane of the grounding chain 2 away from the vertical surface, and is fixed to the circuit breaker mounting plate 11 through the fixing pin 9 and the support ring 10, and has a groove on the plate that can hold the opening button 12; there are two slots on the vertical surface of the opening button locking link 1, which can limit the opening button locking link 1 to limited movement in the vertical direction.

[0032] The working principle of the utility model for switching between the power transmission operation state and the power outage maintenance state is as follows:

[0033] Power transmission operation state: At this time, the cable room door is closed, the grounding switch is in the open state, and the isolating switch and circuit breaker are in the closed state. Figure 4 , Figure 7 As shown;

[0034] Power outage maintenance state: At this time, the cable room door is open, the grounding switch and circuit breaker are closed, and the isolation mechanism is open. Figure 5 , Figure 7 shown.

[0035] (I) Transition from power outage maintenance state to power supply operation state

[0036] 1. Insert the cable room door interlocking piece 15 on the cable room door 16 into the groove between the interlocking plug 8 and the connecting column 3, and insert the cable room door 16 downward into the fixing holes on both sides of the housing. During this process, the interlocking plug 8 moves downward, and the connecting column 3, the grounding chain piece 2, the opening block piece 4, and the opening button locking link piece 1 move downward at the same time, releasing the lock of the opening button 12. At this time, the spring 7 is in a compressed state;

[0037] 2. When the opening button 12 is pressed to open the circuit breaker, the auxiliary arm 18 of the opening mechanism drives the opening stop bar 19 to move downward, further pressing the opening stop plate 4 downward. Figure 8 As shown. The grounding interlock device moves downward again, and the L-shaped bent plate of the grounding chain piece 2 leaves the front of the grounding mechanism operating shaft 20, releasing the lock on the grounding mechanism operating shaft 20. Since the opening block rod 19 presses on the opening block piece 4, the grounding interlock device cannot move upward, thereby achieving the locking of the cable room door 16;

[0038] 3. Figure 5 The grounding mechanism operating shaft 20 shown in FIG. 1 rotates clockwise to make the grounding switch reach the opening position. Figure 6 As shown, during this process, the raised position of the auxiliary crank arm 13 of the grounding mechanism moves clockwise and presses on the surface of the grounding chain piece 2;

[0039] 4. After turning the isolating switch to the closed position, Figure 4 As shown, pressing the closing button 17 closes the circuit breaker. At this time, the solid ring insulated cabinet is in the power transmission operation state. During the closing process of the circuit breaker, the auxiliary arm 18 of the opening mechanism will drive the opening block rod 19 to move upward, releasing the pressure on the opening block plate 4. Figure 7 As shown, since the raised position of the auxiliary crank arm 13 of the grounding mechanism still presses the grounding chain 2, the grounding interlock device still cannot move upward, that is, the cable room door 16 is still in a locked state, thus ensuring safety during operation.

[0040] (ii) Switching from power supply operation state to power outage maintenance state

[0041] 1. Press Figure 4 , Figure 7 In the process of the circuit breaker being opened by the opening button 12 shown below, the auxiliary crank arm 18 of the opening mechanism drives the opening blocking rod 19 to move downward and press on the opening blocking piece 4, as shown in FIG. Figure 8 As shown, turn the isolating switch to the open position. Figure 6 As shown;

[0042] 2. Figure 6 The grounding mechanism operating shaft 20 shown in FIG. 1 rotates counterclockwise to the grounding switch closing position, as shown in FIG. Figure 5 As shown, during this process, the raised position of the auxiliary crank arm 13 of the grounding mechanism moves counterclockwise away from the upper surface of the grounding chain plate 2. Since the opening block rod 19 is pressed on the surface of the opening block plate 4, the grounding interlocking device still cannot move upward, that is, the cable room door 16 is still in a locked state;

[0043] 3. When the closing button 17 is pressed to close the circuit breaker, the auxiliary arm 18 of the opening mechanism will drive the opening lever 19 to move upward. Figure 7 As shown, the pressing of the opening baffle 4 is released, and the grounding interlock device can move upward to release the lock of the cable room door 16;

[0044] 4. Pull out the cable room door upwards. At this time, the solid ring insulated network cabinet is in a power-off maintenance state. During this process, the spring 7 is released from the compressed state, driving the grounding interlocking device to move upward, and then driving the opening button locking link 1 to move upward. At this time, the semicircular groove of the opening button locking link 1 will clamp the opening button 12 and lock the opening button 12; the L-shaped bent plate of the grounding chain 2 blocks the front of the grounding mechanism operating shaft 20, locking the grounding switch to ensure the safety of the maintenance process.

Claims

1. A mechanical interlocking device for preventing misoperation of a 12kV solid insulated ring main unit, characterized in that: It comprises a grounding interlocking device and a switch-off mechanism locking device; the grounding interlocking device comprises a grounding chain piece (2), a connecting column (3), a switch-off blocking piece (4), a bracket (5), a latch (6), a spring (7), an interlocking plug (8), a cable chamber door interlocking piece (15), and a cable chamber door (16).

2. A mechanical interlocking device for preventing misoperation of a 12kV solid insulated ring main unit according to claim 1, characterized in that: The connecting column (3) is provided with a through hole A at a position close to one end thereof, wherein one end of the hole A is the tail end and the other end is the head end.

3. A mechanical interlocking device for preventing misoperation of a 12kV solid insulated ring main unit according to claim 1, characterized in that: The grounding chain piece (2) is fixed to the head end of the connecting column (3); and the switch-off baffle (4) is fixed below the grounding chain piece (2) and above the bracket (5).

4. A mechanical interlocking device for preventing misoperation of a 12kV solid insulated ring main unit according to claim 1, characterized in that: The bracket (5) is a closed-loop frame structure, located near the rear end of the connecting column (3), the connecting column (3) passes through the bracket, and the connecting column (3) and the bracket are not fixed, the bottom of the bracket (5) is fixedly connected to the front middle beam bottom plate (14) of the mechanism room, and the hole A is within the frame of the bracket (5).

5. The mechanical interlocking device for preventing misoperation of a 12kV solid insulated ring main unit according to claim 1, characterized in that: The spring (7) is placed inside the bracket (5), and the connecting column (3) passes through the spring (7); the latch (6) fixes the upper position of the spring (7) through the hole A; and the interlocking plug (8) is fixedly installed at the tail end of the connecting column (3).

6. A mechanical interlocking device for preventing misoperation of a 12kV solid insulated ring main unit according to claim 1, characterized in that: The cable room door interlocking member (15) is fixed on the upper side of the cable room door (16) and has a notch thereon for inserting into the gap between the interlocking plug (8) and the connecting column (3).

7. A mechanical interlocking device for preventing misoperation of a 12kV solid insulated ring main unit according to claim 1, characterized in that: The opening mechanism locking device comprises: an opening button locking link (1), a fixing pin (9), a support ring (10), a circuit breaker mounting plate (11), and an opening button (12); the opening button locking link (1) is fixed at its lower end on a grounding chain (2), and is fixed to the circuit breaker mounting plate (11) via a fixing pin (9) and a support ring (10); and two slots are provided on a vertical surface of the opening button locking link (1), which restrict the opening button locking link (1) to limited movement in the vertical direction.

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