Dual-power circuit breaker change-over switch

Abstract

An electromagnetic mechanical interlocking device comprises a supporting device and a main interlocking plate, the supporting device comprises a supporting frame and two mounting plates, each mounting plate is provided with a circuit breaker main shaft, each circuit breaker main shaft is provided with a locking clamping groove, and the main interlocking plate comprises two locking heads used for being matched with the locking clamping grooves; a standby power supply locking device and a main power supply locking device are arranged on the main interlocking plate, the standby power supply locking device comprises an elastic connecting piece, a locking head on the main interlocking plate can only be buckled with one locking clamping groove in a strong mechanical interlocking mode, the other locking clamping groove is deflected after buckling, only one circuit breaker can be switched on and powered on, and the main power supply locking device can be switched on and switched off. And under the condition that one circuit breaker is electrified, the other circuit breaker cannot be operated, so that the standby power supply button interlocking rod is propped against the standby switching-on synchronous plate, the standby power supply switching-on knob cannot be rotated, and the standby power supply circuit breaker cannot be switched on and switched off.

Description

Technical Field

[0001] The present application relates to the field of switch cabinets, and in particular to a dual power circuit breaker switching switch. Background Art

[0002] With the widespread application of ring main units in power systems, people have put forward new technical requirements for the ring main unit industry technology, mainly for the increasingly high power supply requirements in the power supply system, among which dual power supply is particularly important. The dual power supply switching interlocking mechanism is an interlocking device that must be equipped in high-voltage switchgear. Its purpose is to prevent misoperation and ensure that only one of the two circuit breakers can be closed; therefore, the reliability of the dual power supply switching interlocking mechanism is directly related to whether the power supply system can work normally.

[0003] The existing interlocking device mainly uses a connecting rod or a lever to control the closing or opening of the power supply through a specific mechanical transmission device. The existing interlocking method has defects such as complex structure, cumbersome operation procedures, and poor reliability.

[0004] The main shaft of the circuit breaker and the vacuum interrupter of the switch cabinet are linked. The conventional switch cabinet stores energy through the spring and rotates the main shaft of the circuit breaker to make the copper tube in the vacuum interrupter move up and down to realize the on and off of the circuit breaker. Therefore, the main improvement method of this design is to interlock the two main shafts of the circuit breaker so that in the process of switching the power supply of the dual power distribution system, only one power supply line is allowed to be connected and the other line is disconnected. A new dual power electromagnetic mechanical interlocking device is designed. Utility Model Content

[0005] Based on this, it is necessary to propose a dual power circuit breaker switching switch to address the defects of the traditional dual power switching interlocking mechanism. The switch is directly set on the main shaft of the circuit breaker of the two power supplies to limit the rotation of the main shaft of the circuit breaker, thereby preventing the dual power supplies from being mistakenly connected in parallel and improving the safety during power switching and maintenance.

[0006] The present application provides a dual power circuit breaker switch, wherein the electromagnetic mechanical interlocking device comprises a supporting device and a main interlocking plate, wherein the supporting device comprises a supporting frame and two mounting plates, wherein the two mounting plates are both mounted on a main shaft of the circuit breaker, wherein each main shaft of the circuit breaker is provided with a locking slot, and the main interlocking plate comprises two locking heads for cooperating with the locking slot;

[0007] The main interlocking plate is provided with a backup power supply locking device and a main power supply locking device.

[0008] The backup power locking device and the main power locking device respectively pull the main interlocking plate to move in two opposite directions, and the pulling force of the main power locking device is greater than the pulling force of the backup power locking device.

[0009] Preferably, the backup power supply locking device comprises an elastic connector, one end of which is connected to an adjustment plate, and the other end of which is fixed to a main interlocking plate.

[0010] Preferably, the elastic connecting member is a spring, and the adjusting plate is connected to the mounting plate via an adjusting fixed shaft.

[0011] Preferably, the main power locking device includes an electric telescopic device and a connecting buckle, one end of the connecting buckle is connected to the main interlocking plate, and the other end of the connecting buckle is telescopically linked by the electric telescopic device, and the pulling direction of the electric telescopic device is opposite to the elastic force direction of the elastic connector.

[0012] Preferably, the electric telescopic device is an electromagnetic switch, the electric telescopic device is located between the main interlocking plate and the auxiliary interlocking plate, and the connecting buckle is fixed on one of the linkage rods.

[0013] Preferably, an auxiliary interlock plate is further provided on the main interlock plate, and the auxiliary interlock plate includes an auxiliary interlock main board and multiple linkage rods, and a main power button interlock rod and a backup power button interlock rod are respectively provided on both sides of the auxiliary interlock main board.

[0014] Preferably, the circuit breaker main shaft and the mounting plate are rotationally matched, and the circuit breaker main shaft includes a locking chassis and a rotating shaft, and the locking chassis is sleeved on the rotating shaft and rotates synchronously with the rotating shaft.

[0015] Preferably, a rotating connector is connected to the end of the rotating shaft, the rotating connector is connected to an energy storage spring, and the rotating connector drives the rotating shaft to rotate.

[0016] Preferably, each locking slot is arranged on the locking chassis, and each of the locking slots is an arc-shaped slot, and the end shape of the locking head is a circular plate corresponding to the shape of the arc-shaped slot.

[0017] Preferably, the main interlocking plate is made of a multi-layer steel plate, and a plurality of limiting grooves are arranged on the main interlocking plate, and a fixing screw is arranged in each limiting groove.

[0018] Technical advantages of this application:

[0019] The dual-power distribution system is directly buckled on the main shaft of the circuit breaker through strong mechanical interlocking. The rotation angle of the locking slot is adjusted so that the locking head on the main interlocking plate can only be engaged with one of the locking slots, and the other locking head can no longer cooperate with the other locking slot, so that the unlocked circuit breaker can be closed and powered on or off normally, and the other locked circuit breaker cannot complete the closing operation and is always in the disconnected state. The interlocking between the circuit breakers of the two high-voltage power supplies is strengthened through mechanical interlocking to ensure the safety of the lines and operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The illustrative embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application.

[0021] Figure 1 A schematic diagram of the connection relationship of an electromagnetic mechanical interlocking device provided in one embodiment of the present application;

[0022] Figure 2 A schematic diagram of the three-dimensional structure of an electromagnetic mechanical interlocking device provided in one embodiment of the present application;

[0023] Figure 3 A schematic diagram of the structure of a circuit breaker main shaft provided in one embodiment of the present application;

[0024] Figure 4 A schematic diagram of a main power locked state provided by an embodiment of the present application;

[0025] Figure 5 A schematic diagram of the structure of a main interlocking plate and an auxiliary interlocking plate provided in an embodiment of the present application;

[0026] Figure numerals: switch cabinet 100, supporting device 1; supporting frame 11; mounting plate 12; circuit breaker main shaft 13; locking chassis 131; rotating shaft 132; rotating connecting piece 133; locking slot 130; main interlock plate 2; limiting slot 20; locking head 21; fixing screw 22; auxiliary interlock plate 3; auxiliary interlock main board 31; main power button interlock rod 311; backup power button interlock rod 312; linkage rod 32; backup power locking device 4; elastic connecting piece 41; adjusting plate 42; fixed shaft 421; main power locking device 5; electric telescopic device 51; connecting buckle 52; main power closing button 6; main power synchronization plate 61; backup power closing button 7; backup power synchronization plate 71. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0028] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] like Figures 1 to 5As shown, the present application provides a dual-power circuit breaker switching switch, which is used for interlocking between circuit breakers of two high-voltage power sources, so that only one of them can be closed and energized, and when one is energized, the other cannot be operated, thereby ensuring the safety of the line and operators.

[0030] like Figure 1 A dual power circuit breaker switching switch is shown, which is used for two parallel dual power supply systems, where the right side is the main power supply and the left side is the backup power supply. The electromagnetic mechanical interlocking device is arranged between the main power circuit breaker and the backup power circuit breaker and is fixed on the switch cabinet 100. The mechanical structure moves between the two circuit breakers, so that the two circuit breakers form an interlocking function.

[0031] In the electromagnetic mechanical interlocking device involved in the utility model: the supporting device 1 includes a supporting frame 11 and two mounting plates 12. Specifically, the supporting device 1 is arranged on the switch cabinet, the supporting frame 11 is arranged as a cross-supporting steel material, and is mainly used to fix the main power locking device 5. The two mounting plates 12 are respectively arranged above the main power circuit breaker and the backup power circuit breaker. The two mounting plates 12 are fixed on the circuit breaker main shaft 13, and the front end of the circuit breaker main shaft 13 is connected to the circuit breaker control system.

[0032] A locking slot 130 is provided on the circuit breaker main shaft 13 , and the locking slot 130 is used for locking with the main interlocking plate 2 .

[0033] The two mounting plates 12 are fixed on the switch cabinet on one side of the circuit breaker main shaft 13. Each circuit breaker main shaft 13 is provided with a locking slot 130. The main interlocking plate 2 includes two locking heads 21 for cooperating with the locking slot 130.

[0034] like Figure 3 As shown: the circuit breaker main shaft 13 and the mounting plate 12 are rotatably matched, the circuit breaker main shaft 13 includes a locking chassis 131 and a rotating shaft 132, the locking chassis 131 is sleeved on the rotating shaft 132, and rotates synchronously with the rotating shaft 132, the end of the rotating shaft 132 is connected with a rotating connector 133, the rotating connector 133 is connected to the energy storage spring, and the rotating connector 133 drives the rotating shaft 132 to rotate. Only a linked lifting device needs to be added externally to synchronously control the two rotating connectors 133, so that only one locking slot 130 is engaged with the locking head 21.

[0035] Both locking slots 130 are arc-shaped slots, and the end shape of the locking head 21 is a circular plate corresponding to the shape of the arc-shaped slot. The locking slots 130 can also be set in a triangle, square, etc.

[0036] In the circuit breaker main shaft 13 of the two mounting plates 12 , each locking slot 130 is arranged on the locking chassis 131 , and the two rotating connectors 133 respectively adjust the angle of the locking chassis 131 in the rotating shaft 132 to keep only one locking slot 130 and the locking head 21 engaged.

[0037] Both ends of the main interlock plate 2 in the utility model are provided with locking heads 21 for cooperating with the locking slots 130, and the main interlock plate 2 is slidably buckled on the support frame 11, and the support frame 11 is provided with a groove, and part of the main interlock plate 2 is in the groove, which can limit the main interlock plate 2 to move only in the left and right directions.

[0038] The main interlocking plate 2 is made of a multi-layer steel plate. Four limiting grooves 20 are arranged on the main interlocking plate 2. Each limiting groove 20 is provided with a fixing screw 22. The fixing screw 22 is threadedly connected to the switch cabinet.

[0039] A backup power supply locking device 4 and a main power supply locking device 5 are provided on the main interlocking plate 2. The backup power supply locking device 4 includes an elastic connecting piece 41. One end of the elastic connecting piece 41 is connected to an adjusting plate 42. The other end of the elastic connecting piece 41 is fixed on the main interlocking plate 2. The main power supply locking device 5 includes an electric telescopic device 51 and a connecting buckle 52. One end of the connecting buckle 52 is connected to the main interlocking plate 2. The other end of the connecting buckle 52 is telescopically linked by the electric telescopic device 51. The pulling direction of the electric telescopic device 51 is opposite to the elastic direction of the elastic connecting piece 41.

[0040] The main interlocking plate 2 is made of a multi-layer steel plate. A plurality of limiting grooves 20 are arranged on the main interlocking plate 2 . A fixing screw 22 is arranged in each limiting groove 20 .

[0041] like Figure 4-5 As shown: the main interlocking plate 2 is also provided with an auxiliary interlocking plate 3 that moves synchronously, and the auxiliary interlocking plate 3 includes an auxiliary interlocking main board 31 and two linkage rods 32, one end of the linkage rod 32 is connected to the main interlocking plate 2, and the other end of each linkage rod 32 is connected to the auxiliary interlocking main board 31.

[0042] A main power button interlocking rod 311 and a backup power button interlocking rod 312 are respectively provided on both sides of the auxiliary interlocking main board 31, a main power synchronization plate 61 is provided on the main power closing button 6, and a backup power synchronization plate 71 is provided on the backup power closing button 7. The main power button interlocking rod 311 or the backup power button interlocking rod 312 abuts against the side of one of the main power synchronization plate 61 and the backup power synchronization plate 71 to lock one of the closing buttons.

[0043] The main power closing button 6 is rotated to control the main power circuit breaker to close and energize, and the backup power closing button 7 is rotated to control the backup power circuit breaker to close and energize. Under normal circumstances, only one of the two circuit breakers can be energized to supply power to the user. If the two are connected at the same time, it will cause great danger.

[0044] A main power button interlocking rod 311 and a backup power button interlocking rod 312 are respectively provided on both sides of the auxiliary interlocking main board 31. When a locking head 21 in the main interlocking plate 2 is engaged in the locking slot 130 above the backup power circuit breaker, the backup power button interlocking rod 312 abuts against the backup power synchronization plate 71, so that the backup power closing button 7 cannot be rotated; when a locking head 21 in the main interlocking plate 2 is engaged in the locking slot 130 above the main power circuit breaker, the main power button interlocking rod 311 abuts against the main power synchronization plate 61, so that the main power closing button 6 cannot be rotated.

[0045] The backup power supply locking device 4 and the main power supply locking device 5 control the left and right movement of the main interlocking plate 2 so that the main interlocking plate 2 locks one of the circuit breaker switches.

[0046] The backup power supply locking device 4 comprises an elastic connecting member 41, one end of which is fixed to a switch cabinet close to the backup power supply circuit breaker, and the other end of which is fixed to the main interlocking plate 2;

[0047] The main power locking device 5 includes an electric telescopic device 51 and a connecting buckle 52. One end of the connecting buckle 52 is connected to the main interlocking plate 2, and the other end of the connecting buckle 52 is telescopically linked by the electric telescopic device 51. The pulling direction of the electric telescopic device 51 is opposite to the elastic direction of the elastic connecting member 41.

[0048] The elastic connecting member 41 is a spring, one end of which is fixed to a screw of the main interlocking plate 2, and the other end of the spring is fixed to a connecting column of the switch cabinet. The spring is in a stretched state, and the main interlocking plate 2 is pulled toward the locking slot 130 above the backup power circuit breaker, so that the backup power circuit breaker is always in a locked state.

[0049] The electric telescopic device 51 in the utility model adopts an electromagnetic switch, which is located between the main interlock plate 2 and the auxiliary interlock plate 3. The connecting buckle 52 is fixed on one of the linkage rods 32. The lower end of the electromagnetic switch is fixed on the support frame 11 through the connecting plate. The pulling force provided by the electromagnetic switch is greater than the elastic force of the spring. When the main power fails and the power supply is stopped, the main power circuit breaker is first opened to disconnect the power supply circuit, and then the electromagnetic switch is started to pull the main interlock plate 2 toward the locking slot 130 above the main power circuit breaker to lock the main power closing button 6 of the main power circuit breaker, so that the backup power circuit breaker is unlocked, and the backup power closing button 7 can be rotated to control the backup power circuit breaker to close and power on.

[0050] See also Figure 1-5 , the working principle and process of the entire various states of the mechanical interlocking device for the power supply of the ring network cabinet dual power supply load switch cabinet of the utility model are described:

[0051] When both load switch cabinets are in the open position, the locking head 21 on the main interlocking plate 2 can only be engaged with one of the locking slots 130 by means of strong mechanical interlocking. After the engagement, the other rotating shaft 13 rotates to deflect the other locking slot 130, and the other locking head 21 cannot move any more, so that only one of the circuit breakers can be closed and energized. When one is energized, the other cannot be operated. The mechanical interlocking strengthens the interlocking between the circuit breakers of the two high-voltage power supplies to ensure the safety of the line and operators.

[0052] like Figure 3 As shown: the backup power circuit breaker is locked, the elastic connector 41 engages the locking head 21 with the locking slot 130 on the backup power supply, so that the backup power button interlocking rod 312 abuts against the backup power synchronization plate 71, so that the backup power closing button 7 cannot be rotated, so that the backup power circuit breaker cannot be closed;

[0053] like Figure 5 As shown: when the main power circuit breaker is locked, the electromagnetic switch 51 is used to engage the locking head 21 and the locking slot 130 on the main power supply, and the main power button interlocking rod 311 is against the main power synchronization board 61, so that the main power closing button 6 cannot be operated, and the main power cannot be closed and connected. At the same time, the power button interlocking rod 312 is away from the backup power synchronization board 71, and the backup power closing button 7 can be operated to close the backup power circuit breaker and energize it.

[0054] The technical features of the above-described embodiments may be arbitrarily combined, and the execution order of the method steps is not limited. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A dual power circuit breaker switch, characterized in that: The electromagnetic mechanical interlocking device comprises a supporting device (1) and a main interlocking plate (2), wherein the supporting device (1) comprises a supporting frame (11) and two mounting plates (12), wherein the two mounting plates (12) are both mounted on a circuit breaker main shaft (13), each circuit breaker main shaft (13) being provided with a locking slot (130), and the main interlocking plate (2) comprises two locking heads (21) for cooperating with the locking slots (130); The main interlocking plate (2) is provided with a backup power supply locking device (4) and a main power supply locking device (5). The backup power source locking device (4) and the main power source locking device (5) respectively pull the main interlocking plate (2) to move in two opposite directions, and the pulling force of the main power source locking device (5) is greater than the pulling force of the backup power source locking device (4).

2. The dual power circuit breaker switch according to claim 1, characterized in that: The backup power source locking device (4) comprises an elastic connecting piece (41), one end of the elastic connecting piece (41) is connected to an adjustment plate (42), and the other end of the elastic connecting piece (41) is fixed on the main interlocking plate (2).

3. The dual power circuit breaker switch according to claim 2, characterized in that: The elastic connecting member (41) is a spring, and the adjusting plate (42) is connected to the mounting plate (12) via an adjusting fixing shaft (421).

4. The dual power circuit breaker switch according to claim 3, characterized in that: The main power locking device (5) comprises an electric telescopic device (51) and a connecting buckle (52), one end of the connecting buckle (52) is connected to the main interlocking plate (2), and the other end of the connecting buckle (52) is telescopically linked by the electric telescopic device (51), and the pulling direction of the electric telescopic device (51) is opposite to the elastic direction of the elastic connecting member (41).

5. The dual power circuit breaker switch according to claim 4, characterized in that: The electric telescopic device (51) is an electromagnetic switch, and the electric telescopic device (51) is located between the main interlocking plate (2) and the auxiliary interlocking plate (3), and the connecting buckle (52) is fixed on one of the linkage rods (32).

6. The dual power circuit breaker switch according to claim 5, characterized in that: An auxiliary interlocking plate (3) is also provided on the main interlocking plate (2), the auxiliary interlocking plate (3) comprising an auxiliary interlocking main plate (31) and a plurality of linkage rods (32), and a main power button interlocking rod (311) and a backup power button interlocking rod (312) are respectively provided on both sides of the auxiliary interlocking main plate (31).

7. The dual power circuit breaker switch according to claim 6, characterized in that: The circuit breaker main shaft (13) and the mounting plate (12) are rotatably matched, the circuit breaker main shaft (13) comprises a locking chassis (131) and a rotating shaft (132), the locking chassis (131) is sleeved on the rotating shaft (132) and rotates synchronously with the rotating shaft (132).

8. The dual power circuit breaker switch according to claim 7, characterized in that: The end of the rotating shaft (132) is connected to a rotating connecting piece (133), the rotating connecting piece (133) is connected to an energy storage spring, and the rotating connecting piece (133) drives the rotating shaft (132) to rotate.

9. The dual power circuit breaker switch according to claim 8, characterized in that: Each locking slot (130) is arranged on a locking chassis (131); the locking slots (130) are all arc-shaped slots; and the end shape of the locking head (21) is a circular plate corresponding to the shape of the arc-shaped slot.

10. The dual power circuit breaker switch according to claim 1, characterized in that: The main interlocking plate (2) is made of a multi-layer steel plate. A plurality of limiting grooves (20) are provided on the main interlocking plate (2), and a fixing screw (22) is provided in each limiting groove (20).

Images