Cold and hot standby switching remote control device for high-voltage switch cabinet circuit breaker

Abstract

The invention relates to the technical field of electrical equipment maintenance and management, in particular to a high-voltage switch cabinet circuit breaker cold and hot standby switching remote control device which comprises a chassis base slidably connected to the interior of a cabinet body and used for bearing a circuit breaker trolley and a screw in threaded connection with the chassis base. The control cabinet body can drive the breaker trolley to move, the transmission assembly comprises a first gear installed on the screw rod and a driving motor installed in the control cabinet body, and the driving motor drives the breaker trolley to move. According to the invention, the servo motor and the control unit are combined to form the remote control device for the breaker trolley of the high-voltage switch cabinet, so that an operator can operate at a safe position far away from high-voltage equipment, and the opportunity of directly contacting dangerous equipment is reduced; and personal injury accidents caused by inter-phase short circuit and grounding of equipment due to defects of the equipment, non-standard operation and the like in the process of shaking the trolley can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of electrical equipment maintenance and management, and in particular to a remote control device for cold and hot standby switching of a circuit breaker in a high-voltage switch cabinet. Background Art

[0002] The high-voltage switch cabinet circuit breaker is a key electrical equipment in the high-voltage switch cabinet, mainly used to control and protect electrical equipment in the high-voltage circuit. It can connect and disconnect the circuit under normal circumstances to realize the operation and control of the power system; in the case of a fault, it can quickly cut off the fault current, protect the electrical equipment from damage, and ensure the safe and stable operation of the power system. When the circuit breaker is in cold standby, it means that the circuit breaker is in the disconnected position, and the disconnectors on both sides are also in the disconnected position, the operating power of the circuit breaker is disconnected, and the secondary circuit is also in a non-energized state. The hot standby circuit breaker is in the disconnected position, but the disconnectors on both sides are closed, the operating power is connected, and the secondary circuit is energized. As long as the closing command is received, it can be put into operation immediately. During the operation of the power system, it is necessary to flexibly adjust the topology of the power grid according to load changes, equipment maintenance, fault handling, etc. The cold and hot standby of the circuit breaker is one of the important means to achieve this adjustment.

[0003] At present, unmanned substation high-voltage switchgear still requires electricians to manually shut down the power supply and use a handle to manually swing the circuit breaker trolley to the hot standby state or the cold standby state. During the operation, the electrician may cause personal injury due to the failure of the five protections of the switchgear, defects in the equipment, improper operation, etc., which may cause short circuit or grounding between phases of the equipment.

[0004] Based on the above situation, we propose a remote control device for cold and hot standby switching of high-voltage switch cabinet circuit breaker to solve the above problems. Summary of the invention

[0005] The invention provides a remote control device for cold and hot standby switching of a circuit breaker in a high-voltage switch cabinet, so as to solve the problem that manual operation of a circuit breaker trolley in the prior art easily generates potential safety hazards.

[0006] The technical problem solved by the present invention is achieved by adopting the following technical solutions: A remote control device for cold and hot standby switching of a circuit breaker in a high-voltage switch cabinet comprises a chassis seat slidably connected to the inside of a cabinet for supporting a circuit breaker trolley and a screw threadedly connected to the chassis seat, the screw being rotatably connected to the cabinet, and when the screw rotates, the circuit breaker trolley can be driven to move, and also comprises a transmission assembly, a circuit breaker state monitoring unit and a control unit, the transmission assembly comprising a first gear mounted on the screw and a drive motor mounted inside a control cabinet, the operation of the drive motor being regulated by a motor drive module adapted thereto, the output end of the drive motor being connected to a second gear through an over-torque protection mechanism for automatically reducing power transmission when the transmission torque exceeds a preset value, the second gear being connected to the first gear through a transmission chain transmission, the circuit breaker state monitoring unit being used to detect the closing and opening states of the high-voltage circuit breaker, the control unit being respectively communicatively connected to the circuit breaker state monitoring unit and the servo motor, and being used to control the forward and reverse operation of the drive motor after receiving a signal from the circuit breaker state monitoring unit.

[0007] Preferably, the circuit breaker state monitoring unit includes a current detection unit, which is connected to the power line where the high-voltage circuit breaker is located, and assists in determining the state of the high-voltage circuit breaker by detecting whether there is current in the line.

[0008] Preferably, the over-torque protection mechanism includes a first friction plate connected to the output end of the drive motor and a mounting bracket connected to the second gear, a pressure plate is connected to the inner wall of the mounting bracket via a spring, and a second friction plate that contacts the first friction plate is connected to one end of the pressure plate away from the spring.

[0009] Preferably, the control unit also includes a discrimination module and an alarm module. When the circuit breaker state monitoring unit detects that the high-voltage circuit breaker is in a closed state, the discrimination module prohibits the motor drive module from executing a drive instruction for switching the circuit breaker trolley to a cold standby or hot standby state. When the circuit breaker state monitoring unit detects that the high-voltage circuit breaker is in an open state, the motor drive module is allowed to execute corresponding circuit breaker trolley operation drive instructions. When the discrimination module prohibits the drive instruction and receives an operation request that does not match the current circuit breaker state, the alarm module sends an alarm signal.

[0010] Preferably, the control unit further comprises a locking module, and when the identification module prohibits the driving instruction, the locking module locks the operation input to the motor driving module until the state of the high-voltage circuit breaker changes to the operation-allowed state and the lock is released after receiving an unlocking signal.

[0011] Preferably, the first friction disc and the second friction disc are respectively provided with a first angle sensor and a second angle sensor electrically connected to the control unit.

[0012] Preferably, a protective shell is further provided inside the cabinet, and the transmission assembly is located inside the protective shell.

[0013] The beneficial effects of the present invention are as follows: by combining a servo motor and a control unit into a remote control device for a high-voltage switch cabinet circuit breaker trolley, an operator can operate in a safe position away from high-voltage equipment, greatly reducing the chance of direct contact with dangerous equipment, and solving the problem of personal injury accidents caused by phase short circuit and grounding of equipment due to defects in the equipment and improper operation during the shaking of the trolley. Moreover, under the action of the over-torque protection mechanism, when abnormal resistance occurs during operation, the over-torque protection device can act in time to reduce the transmission of the drive motor power and prevent the drive motor from being damaged due to overload, while also avoiding equipment failures and safety accidents that may be caused by forced operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 An isometric structural schematic diagram provided by the present invention; Figure 2 A schematic diagram of a cross-sectional structure provided by the present invention; Figure 3 A schematic diagram of the transmission assembly structure provided by the present invention; Figure 4 It is a structural schematic diagram of the over-torque protection mechanism provided in the present invention; Figure 5 The system frame provided in the present invention Figure 1 ; Figure 6 The system frame provided in the present invention Figure 2 ; Figure 7 The system frame provided in the present invention Figure 3 .

[0016] In the figure, 1. cabinet; 11. circuit breaker trolley; 12. chassis seat; 13. screw; 2. first gear; 21. drive motor; 201. motor drive module; 22. second gear; 23. transmission chain; 3. over-torque protection mechanism; 31. first friction disk; 32. mounting frame; 33. spring; 34. pressure disk; 35. second friction disk; 4. circuit breaker status monitoring unit; 5. control unit; 51. identification module; 52. alarm module; 53. locking module; 6. first angle sensor; 61. second angle sensor; 7. protective shell. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0018] Reference Figure 1-Figure 7 As shown, a remote control device for cold and hot standby switching of a circuit breaker in a high-voltage switch cabinet comprises a chassis seat 12 slidably connected to the inside of a cabinet 1 for supporting a circuit breaker trolley 11 and a screw 13 threadedly connected to the chassis seat 12. The screw 13 is rotatably connected to the cabinet 1. When the screw 13 rotates, the circuit breaker trolley 11 can be driven to move. Since the chassis seat 12 is slidably connected to the cabinet 1, when the screw 13 rotates, the circuit breaker trolley 11 can be driven to drive the conductive contacts arranged above it to contact the fixed conductive contacts in the power distribution cabinet. Phase contact or disconnection, the circuit breaker is connected to the electrical circuit or separated from the electrical circuit, and the above is the prior art, which should be known to those skilled in the art, and will not be described in detail here. At present, the operation of the circuit breaker trolley 11 is generally performed by inserting a hand-held operating tool into the end of the screw 13 and rotating the screw 13. In this process, if the five protections of the switch cabinet fail, the equipment has defects, the operation is not standardized, etc., causing the equipment to short-circuit between phases and grounding, it will cause personal injury. Therefore, the present invention makes the following improvements: Specifically, it includes a transmission component, which includes a first gear 2 installed on the screw 13 and a drive motor 21 installed inside the control cabinet 1. The operation of the drive motor 21 is regulated by a motor drive module 201 adapted thereto. The output end of the drive motor 21 is connected to a second gear 22 through an over-torque protection mechanism 3 for automatically reducing power transmission when the transmission torque exceeds a preset value. The second gear 22 is connected to the first gear 2 through a transmission chain 23. When the drive motor 21 runs to drive the second gear 22 to rotate, the second gear 22 drives the first gear 2 to rotate through the transmission chain 23, thereby driving the screw 13 to rotate. At this time, there is no need for manual rotation of the screw 13, which is safer. At the same time, it also includes a device for detecting the closing and opening states of the high-voltage circuit breaker. The circuit breaker state monitoring unit 4 and the control unit 5 are respectively connected to the circuit breaker state monitoring unit 4 and the servo motor for communication, and are used to control the forward and reverse operation of the drive motor 21 after receiving the signal of the circuit breaker state monitoring unit 4. When the circuit breaker is in the closed state, current flows through the circuit. If the circuit breaker trolley 11 is switched to cold standby or hot standby at this time, serious electrical accidents such as electric arc and short circuit may be caused. The circuit breaker state monitoring unit 4 can monitor the state of the circuit breaker in real time, and transmit the detection result to the control unit 5. If the closed state is detected, the control unit 5 will not send a command to the motor drive module 201 to drive the motor 21 to run. On the contrary, when the open state is detected, a command to drive the motor 21 to run can be sent to the motor drive module 201.

[0019] Furthermore, the circuit breaker state monitoring unit 4 includes a current detection unit, which can adopt a current transformer, etc., which is connected to the power line where the high-voltage circuit breaker is located, at the location where the current passes through, such as the outlet or inlet of the circuit breaker, by detecting whether there is current in the line to assist in judging the state of the high-voltage circuit breaker. When current passes through, it can be inferred that the circuit breaker is in a closed state. At this time, the circuit breaker trolley 11 may cause changes in the distance between the contacts and poor contact during the pushing process, which may easily generate an arc and cause a short circuit fault, damaging the electrical equipment. The circuit breaker trolley 11 cannot be pushed into the cabinet 1. On the contrary, when it is in the open state, no current passes through the circuit. At this time, pushing the circuit breaker trolley 11 into the cabinet 1 is a relatively safe operation.

[0020] Among them, refer to Figure 3-Figure 4As shown, in order to avoid excessive torque caused by foreign objects on the track, jamming of mechanical parts, etc. when the chassis vehicle slides in the cabinet 1, the over-torque protection device can be activated in time to weaken the transmission of power of the drive motor 21 in time to prevent the drive motor 21 from being damaged due to overload, while also avoiding equipment failures and safety accidents that may be caused by forced operation. Specifically, the over-torque protection mechanism 3 includes a first friction plate 31 connected to the output end of the drive motor 21 and a mounting frame 32 connected to the second gear 22. A pressure plate 34 is connected to the inner wall of the mounting frame 32 through a spring 33. The end of the pressure plate 34 away from the spring 33 is connected to a contact with the first friction plate 31. The second friction plate 35, through the pressure of the spring 33 on the pressure plate 34, causes the pressure plate 34 to drive the second friction plate 35 to come into close contact with the first friction plate 31, and generate sufficient friction force to transmit power. When the drive motor 21 is running, the friction force between the first friction plate 31 and the second friction plate 35 can drive the operation of the second gear 22, thereby driving the rotation of the first gear 2. However, when the torque is too large, greater than the friction force between the first friction plate 31 and the second friction plate 35, relative sliding occurs between the first friction plate 31 and the second friction plate 35, and the power transmission will be weakened or interrupted, so that the transmission force will not be transmitted to the second gear 22, thereby improving the safety of use.

[0021] Reference Figure 4 As shown, further, the first friction disc 31 and the second friction disc 35 are respectively provided with a first angle sensor 6 and a second angle sensor 61 electrically connected to the control unit 5. When the drive motor 21 drives the second gear 22 to move for normal transmission, the first friction disc 31 and the second friction disc 35 will rotate synchronously due to the friction force between the two. At this time, the rotation values ​​detected by the first angle sensor 6 and the second angle sensor 61 are the same, but when the transmission force is weakened or stopped, the rotation amplitudes of the first friction disc 31 and the second friction disc 35 are different, that is, the second friction disc 35 is immobilized by the blocking resistance, while the first friction disc 31 will continue to rotate with the drive motor 21. At this time, the values ​​detected by the first angle sensor 6 and the second angle sensor 61 are different, and the signals will be transmitted to the control unit 5, and the control unit 5 controls the alarm module 52 to issue an alarm.

[0022] Furthermore, the control unit 5 also includes a discrimination module 51 and an alarm module 52. When the circuit breaker state monitoring unit 4 detects that the high-voltage circuit breaker is in a closed state, the discrimination module 51 prohibits the motor drive module 201 from executing the drive instruction to switch the circuit breaker trolley 11 to a cold standby or hot standby state; when the circuit breaker state monitoring unit 4 detects that the high-voltage circuit breaker is in an open state, the motor drive module 201 is allowed to execute the corresponding circuit breaker trolley 11 operation drive instruction. When the discrimination module 51 prohibits the drive instruction and receives an operation request that does not match the current circuit breaker state, the alarm module 52 sends an alarm signal. When it involves a multi-step operation sequence and switching between different operation modes, such as switching from a normal operating state to a closed state, the alarm module 52 sends an alarm signal. When operating the circuit breaker trolley 11 in the maintenance state, the discrimination module 51 can ensure the correct sequence and interlocking relationship between each step, and ensure the safety and correctness of the entire operation process. The alarm module 52 can be a visual alarm or an auditory alarm. During normal operation, the alarm module 52 can issue an alarm according to the instructions of the discrimination module 51 to inform the operator of the operation stage of the circuit breaker trolley 11; when an abnormal situation occurs, the alarm is used to remind the operator to pay attention and take corresponding measures, and the alarm prompt at this time can be different from the alarm prompt when the values ​​detected by the first angle sensor 6 and the second angle sensor 61 are different, so that the personnel can distinguish what kind of problem it is.

[0023] Furthermore, the control unit 5 also includes a locking module 53. When the discrimination module 51 prohibits the driving instruction, the locking module 53 locks the operation input to the motor drive module 201 until the state of the high-voltage circuit breaker is changed to the state allowing operation and the unlocking signal is received and then the lock is released. When the circuit breaker is in the closed state, the operator may accidentally touch the operation button or the control system may be disturbed and issue an erroneous operation instruction, causing the servo motor drive module 201 to receive an inappropriate signal and perform an erroneous operation. The locking module 53 can prevent erroneous operation when the operating conditions are not met, thereby improving safety.

[0024] Further, see Figure 2 As shown, a protective housing 7 is also provided inside the cabinet 1, and the transmission assembly is located inside the protective housing 7. The protective housing 7 can be a housing with an electromagnetic shielding layer inside or a housing with a filtering structure. In the substation, there are a large number of electrical equipment, which will generate various electromagnetic signals during operation. These electromagnetic signals may interfere with weak current components such as controllers and sensors. The protective housing 7 can shield external electromagnetic signals, ensure the accuracy of internal weak current signal transmission, ensure the stable operation of the entire system, reduce dust entry, keep the transmission components clean, and ensure transmission accuracy.

Claims

1. A remote control device for cold and hot standby switching of a circuit breaker in a high-voltage switch cabinet, comprising a chassis seat (12) slidably connected to the inside of a cabinet (1) for supporting a circuit breaker trolley (11), and a screw (13) threadedly connected to the chassis seat (12), wherein the screw (13) is rotatably connected to the cabinet (1), and when the screw (13) rotates, the circuit breaker trolley (11) can be driven to move, characterized in that: Also includes; A transmission assembly, the transmission assembly comprising a first gear (2) mounted on a screw rod (13) and a drive motor (21) mounted inside a control cabinet (1), the operation of the drive motor (21) being regulated by a motor drive module (201) adapted thereto, the output end of the drive motor (21) being connected to a second gear (22) via an over-torque protection mechanism (3) for automatically reducing power transmission when a transmission torque exceeds a preset value, the second gear (22) being transmission-connected to the first gear (2) via a transmission chain (23); A circuit breaker state monitoring unit (4), the circuit breaker state monitoring unit (4) being used to detect the closing and opening states of the high-voltage circuit breaker; A control unit (5) is respectively connected to the circuit breaker state monitoring unit (4) and the servo motor for communication, and is used to control the forward and reverse operation of the drive motor (21) after receiving a signal from the circuit breaker state monitoring unit (4).

2. A remote control device for cold and hot standby switching of a high-voltage switch cabinet circuit breaker according to claim 1, characterized in that: The circuit breaker state monitoring unit (4) comprises a current detection unit, which is connected to the power line where the high-voltage circuit breaker is located, and assists in determining the state of the high-voltage circuit breaker by detecting whether there is current in the line.

3. A remote control device for cold and hot standby switching of a high-voltage switch cabinet circuit breaker according to claim 1, characterized in that: The over-torque protection mechanism (3) comprises a first friction plate (31) connected to the output end of the drive motor (21) and a mounting frame (32) connected to the second gear (22); a pressure plate (34) is connected to the inner wall of the mounting frame (32) via a spring (33); and a second friction plate (35) abutting against the first friction plate (31) is connected to one end of the pressure plate (34) away from the spring (33).

4. A remote control device for cold and hot standby switching of a high-voltage switch cabinet circuit breaker according to claim 1, characterized in that: The control unit (5) further comprises a determination module (51) and an alarm module (52); when the circuit breaker state monitoring unit (4) detects that the high-voltage circuit breaker is in a closed state, the determination module (51) prohibits the motor drive module (201) from executing a drive instruction for switching the circuit breaker trolley (11) to a cold standby or hot standby state; when the circuit breaker state monitoring unit (4) detects that the high-voltage circuit breaker is in an open state, the motor drive module (201) is allowed to execute a corresponding circuit breaker trolley (11) operation drive instruction; when the determination module (51) prohibits a drive instruction and receives an operation request that does not match the current circuit breaker state, the alarm module (52) issues an alarm signal.

5. A remote control device for cold and hot standby switching of a high-voltage switch cabinet circuit breaker according to claim 1, characterized in that: The control unit (5) further comprises a locking module (53), which, when the identification module (51) prohibits the driving instruction, locks the operation input to the motor driving module (201) until the state of the high-voltage circuit breaker changes to an operation-permitting state and the locking is released after receiving an unlocking signal.

6. A remote control device for cold and hot standby switching of a high-voltage switch cabinet circuit breaker according to claim 2, characterized in that: The first friction disc (31) and the second friction disc (35) are respectively provided with a first angle sensor (6) and a second angle sensor (61) which are electrically connected to the control unit (5).

7. A remote control device for cold and hot standby switching of a high-voltage switch cabinet circuit breaker according to claim 1, characterized in that: A protective shell (7) is also provided inside the cabinet (1), and the transmission assembly is located inside the protective shell (7).

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