An induction type high voltage switch cabinet grounding switch device

Abstract

The invention discloses an induction type high voltage switch cabinet grounding switch device, which utilizes the adsorption force of a permanent magnetic moving iron core to contact with the bottom of a lower sleeve to resist the elastic force of a spring. When closing the switch, the electromagnetic coil is energized to apply electromagnetic force to the permanent magnetic moving iron core. When the electromagnetic force and the spring elastic force are greater than the adsorption force of the permanent magnetic moving iron core, the permanent magnetic moving iron core is separated from the bottom surface of the lower sleeve, and the force between the permanent magnetic moving iron core and the lower sleeve is instantly reduced. Under the action of the spring, the permanent magnetic moving iron core can quickly lever the connecting bracket to rotate so that the moving head and the static contact contact to achieve the purpose of discharge. The device is fast in response and maintenance-free, and has the advantages of being able to standby for a long time. Within the safety standard, it can maintain a stable state for a long time when the grounding knife is separated, and can quickly respond to close the switch after power failure, and can use manual closing at the same time. When the power failure state ends, it is necessary to manually open the switch, which ensures that the operator forgets to open the switch, thereby improving production safety.

Description

Technical Field

[0001] The invention belongs to the field of high-voltage cabinet safety devices, and in particular relates to an induction-type high-voltage switch cabinet grounding switch device. Background Art

[0002] Regardless of whether the high-voltage cabinet is powered off normally or abnormally, according to the requirements of power safety operation, the live devices need to be grounded and discharged to avoid the residual charge of the live devices generating coupling voltage after power failure, which is dangerous to the operator. In the current safety device of the electric cabinet, the movement process of the monostable permanent magnet motor and the nonlinear change of the driving coil inductance are explained. During the movement of the moving contact of the mechanism, the change of the magnetic field will generate a back electromotive force in the coil. The existence of the back electromotive force will prevent the coil current from increasing, which has the same effect as the coil inductance. The back electromotive force generated by the coil during the reciprocating motion has a significant impact on the coil current, the actual inductance of the coil, and the excitation capacitor voltage. The current grounding devices are all manually separated and closed. In actual operation, it is inevitable that the separation and closing will be forgotten. Although the high-voltage cabinet has a five-protection interlock, since the five-protection interlock is a simple mechanical interlock, the stability and actual effect of the interlock are always unsatisfactory, and it is impossible to meet the requirements of 100% grounding protection. At the same time, for the maintenance force mechanism, the existing similar mechanism structure is complex and the technical threshold is high, and it is impossible to achieve automatic and manual dual-mode operation. In order to ensure the safety of operators and equipment, grounding must be performed before operation after the high-voltage cabinet is powered off. Therefore, the grounding device is designed according to the needs, which can automatically perform grounding and closing operations after the high-voltage cabinet is powered off. Summary of the invention

[0003] The purpose of the present invention is to provide an induction type high voltage switch cabinet grounding switch device to overcome the deficiencies of the prior art. The present invention has fast response, is maintenance-free, and can be in standby mode for a long time.

[0004] In order to achieve the above object, the present invention adopts the following technical scheme:

[0005] An induction type high-voltage switch cabinet grounding switch device comprises a lever connecting bracket, a lower sleeve, a fixing bracket and a static contact fixed to the upper end of the fixing bracket by an insulator, the static contact is electrically connected to a live wire row, a transverse bracket is provided on one side of the fixing bracket, the lower end of the lever connecting bracket is rotatably connected to the transverse bracket, a moving contact capable of contacting the static contact is fixed to the upper end of the lever connecting bracket, the moving contact is electrically connected to the grounding row, the lower end of the lower sleeve is rotatably connected to the transverse bracket, a permanent magnetic moving iron core capable of sliding in a lower sleeve is provided in the lower sleeve, one end of the permanent magnetic moving iron core is sleeved in the lower sleeve, a spring is provided in the lower sleeve, one end of the spring is in contact with one end of the permanent magnetic moving iron core, and the other end is in contact with the inner bottom of the lower sleeve, the other end of the permanent magnetic moving iron core is rotatably connected to one side of the lever connecting bracket, and an electromagnetic coil for driving the permanent magnetic moving iron core to move is provided on the outer side of the lower sleeve.

[0006] Furthermore, when the end of the permanent magnetic moving iron core contacts the inner bottom of the lower sleeve, the adsorption force between the permanent magnetic moving iron core and the lower sleeve is greater than the elastic force of the spring.

[0007] Furthermore, after the electromagnetic coil is energized, the permanent magnet moving iron core is subjected to the electromagnetic magnetic field force and the elastic force of the spring, which is greater than the adsorption force between the permanent magnet moving iron core and the lower sleeve.

[0008] Furthermore, one end of the permanent magnet moving iron core is provided with a groove, and one end of the spring is arranged in the groove.

[0009] Furthermore, a boss is provided on the permanent magnetic moving iron core, and one end of the permanent magnetic moving iron core is inserted into the spring, and the end of the spring contacts the end surface of the boss on the permanent magnetic moving iron core.

[0010] Furthermore, the lower end of the lever connecting bracket is rotatably connected to the transverse bracket through a movable shaft. When the end of the permanent magnetic moving iron core contacts the bottom of the lower sleeve, the axis of the permanent magnetic moving iron core does not pass through the rotation center of the lower end of the lever connecting bracket.

[0011] Furthermore, the lower end of the lower sleeve is rotatably connected to the transverse bracket via a rotating pin.

[0012] Furthermore, an outer ring of the lower sleeve is provided with an electromagnetic coil groove, the electromagnetic coil is diffracted in the electromagnetic coil groove, an outer cover is provided on the outer side of the electromagnetic coil groove, and a terminal connected to the electromagnetic coil is provided on the outer cover, and a power supply is connected through the terminal.

[0013] Furthermore, it also includes a controller for controlling the on and off of the electromagnetic coil. The controller is connected to the high-voltage electrical cabinet through a voltage detection module, and the voltage detection module is used to detect the voltage condition of the high-voltage electrical cabinet.

[0014] Furthermore, the fixing frame and the transverse support are an integrated structure.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects:

[0016] The present invention discloses an induction type high voltage switch cabinet grounding switch device, comprising a lever connection bracket, a lower sleeve, a fixing bracket and a static contact fixed to the upper end of the fixing bracket through an insulator, the static contact is electrically connected to a live wire row, a transverse bracket is provided on one side of the fixing bracket, the lower end of the lever connection bracket is rotatably connected to the transverse bracket, a moving contact capable of contacting the static contact is fixed to the upper end of the lever connection bracket, the moving contact is electrically connected to the grounding row, the lower end of the lower sleeve is rotatably connected to the transverse bracket, a permanent magnetic moving iron core capable of sliding in a lower sleeve is provided in the lower sleeve, one end of the permanent magnetic moving iron core is sleeved in the lower sleeve, a spring is provided in the lower sleeve, one end of the spring is in contact with one end of the permanent magnetic moving iron core, the other end is in contact with an inner bottom of the lower sleeve, the other end of the permanent magnetic moving iron core is rotatably connected to one side of the lever connection bracket, the lower sleeve The outer side is provided with an electromagnetic coil for driving the permanent magnetic moving iron core to move. The adsorption force of the permanent magnetic moving iron core is used to contact the bottom of the lower sleeve to resist the elastic force of the spring. When the switch needs to be closed, the electromagnetic coil is energized to apply electromagnetic force to the permanent magnetic moving iron core. When the electromagnetic force and the spring elastic force are greater than the adsorption force of the permanent magnetic moving iron core, the permanent magnetic moving iron core is separated from the bottom surface of the lower sleeve, and the force between the permanent magnetic moving iron core and the lower sleeve is instantly reduced. Under the action of the spring, the permanent magnetic moving iron core can quickly lever the connecting bracket to rotate so that the moving head and the static contact contact to achieve the purpose of discharge. This device has fast response and maintenance-free, and has the advantages of long standby time. Within the safety standard, it can maintain a stable state for a long time when the grounding knife is separated. When the power is off, it can quickly respond to close the switch, and manual closing can be used at the same time. When the power-off state ends, it is necessary to manually open the switch to ensure that the operator forgets to open the switch, thereby improving production safety.

[0017] Furthermore, a groove is provided at one end of the permanent magnet moving iron core, and one end of the spring is arranged in the groove, which has a simple structure and is safe and reliable.

[0018] Furthermore, a boss is provided on the permanent magnetic moving iron core, one end of the permanent magnetic moving iron core is inserted into the spring, and the end of the spring contacts the end surface of the boss on the permanent magnetic moving iron core, which has a simple structure and stable transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the present invention.

[0020] Figure 2 It is a top view of an embodiment of the present invention.

[0021] Figure 3 Schematic diagram of the structure in the open state in an embodiment of the present invention.

[0022] Figure 4 Schematic diagram of the structure of the permanent magnet moving iron core in an embodiment of the present invention.

[0023] Among them, 1-transverse bracket, 2-lower sleeve, 3-terminal, 4-electromagnetic coil slot, 5-permanent magnet moving iron core, 6-lever connecting bracket, 7-moving contact, 8-static contact, 9-insulator, 10-fixed frame, 11-movable shaft, 12-spring, 13-electromagnetic coil. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0025] like Figure 1 As shown, an induction type high-voltage switch cabinet grounding switch device comprises a lever connecting bracket 6, a lower sleeve 2, a fixing frame 10 and a static contact 8 fixed to the upper end of the fixing frame 10 through an insulator 9, the static contact is connected to the live wire row, a transverse bracket 1 is provided on one side of the fixing frame 10, the lower end of the lever connecting bracket 6 is rotatably connected to the transverse bracket 1, a moving contact 7 capable of contacting the static contact 8 is fixed to the upper end of the lever connecting bracket 6, the lower end of the lower sleeve 2 is rotatably connected to the transverse bracket 1, a permanent magnetic moving iron core 5 capable of sliding in the lower sleeve is provided in the lower sleeve 2, one end of the permanent magnetic moving iron core 5 is sleeved in the lower sleeve 2, a spring 12 is provided in the lower sleeve 2, one end of the spring 12 contacts with one end of the permanent magnetic moving iron core 5, and the other end contacts with the inner bottom of the lower sleeve 2, the other end of the permanent magnetic moving iron core 5 is rotatably connected to one side of the lever connecting bracket 6, and an electromagnetic coil 13 for driving the permanent magnetic moving iron core 5 to move is provided on the outer side of the lower sleeve 2. When the end of the permanent magnet moving iron core 5 contacts the inner bottom of the lower sleeve 2, the adsorption force between the permanent magnet moving iron core 5 and the lower sleeve 2 is greater than the elastic force of the spring; after the electromagnetic coil 13 is energized, the permanent magnet moving iron core 5 is subjected to the electromagnetic magnetic field force and the elastic force of the spring, which is greater than the adsorption force between the permanent magnet moving iron core 5 and the lower sleeve 2.

[0026] like Figure 2 As shown, one end of the permanent magnetic moving core 5 is provided with a groove, and one end of the spring 12 is arranged in the groove, which can ensure that when one end of the permanent magnetic moving core 5 contacts the bottom of the lower sleeve 2, the spring 12 will not reach the compression limit, or Figure 4 As shown, a boss is provided on the permanent magnetic moving iron core 5 , and one end of the permanent magnetic moving iron core 5 is inserted into the spring 12 , and the end of the spring 12 contacts the end surface of the boss on the permanent magnetic moving iron core 5 .

[0027] Specifically, the outer ring of the lower sleeve 2 is provided with an electromagnetic coil slot, the electromagnetic coil is diffracted in the electromagnetic coil slot, an outer cover is provided on the outer side of the electromagnetic coil slot, and a terminal 3 connected to the electromagnetic coil is provided on the outer cover, and the power supply is connected through the terminal 3. A controller for controlling the on and off of the electromagnetic coil is also included, the controller is connected to the high-voltage cabinet through a voltage detection module, and the controller detects whether the high-voltage cabinet loses power through the voltage detection module. When the high-voltage cabinet loses power, the controller controls the electromagnetic coil to be energized by connecting the electromagnetic coil with the control switch, and the electromagnetic coil is energized to work; the controller of this application adopts a PLC controller.

[0028] like Figure 3 As shown, when the electromagnetic coil 13 is not energized, the end of the permanent magnetic moving iron core 5 contacts and is adsorbed to the bottom of the lower sleeve 2. When the permanent magnetic moving iron core 5 is adsorbed to the bottom of the lower sleeve 2, the attraction of the permanent magnetic moving iron core 5 is balanced with the spring potential energy, and the system maintains a steady state.

[0029] The fixing frame 10 and the transverse support 1 are an integrated structure, and the structural installation stability is good, ensuring that the opening and closing process is safe and reliable.

[0030] The permanent magnet moving iron core 5 of the present application adopts a neodymium magnet, which is fully called a neodymium iron boron magnet (NdFeB magnet), and is a tetragonal crystal formed by neodymium, iron, and boron (Nd2Fe14B).

[0031] Specifically, the lower end of the lever connection bracket 6 is rotatably connected to the transverse bracket 1 through the movable shaft 11. When the end of the permanent magnetic moving iron core 5 contacts the inner bottom of the lower sleeve 2, the axis of the permanent magnetic moving iron core 5 does not pass through the rotation center of the lower end of the lever connection bracket 6, which can ensure that when the permanent magnetic moving iron core 5 is subjected to the electromagnetic driving force, it can drive the lever connection bracket 6 to rotate. The lower end of the lower sleeve 2 is rotatably connected to the transverse bracket 1 through a rotating pin.

[0032] When the high voltage cabinet is energized, this application Figure 3As shown, it is in the open state, the electromagnetic coil 13 is not energized, the end of the permanent magnetic moving core 5 is adsorbed on the inner bottom of the lower sleeve 2, and the permanent magnet is composed of a neodymium magnet. When the high-voltage cabinet is powered off or loses power, the high-voltage cabinet electronic protection controller is activated to control the power supply to the electromagnetic coil 13. The current and voltage of the electromagnetic coil are provided by UPS. UPS is a standard configuration of the high-voltage cabinet control system. UPS is an uninterruptible power supply (Uninterruptible Power Supply), which is an uninterruptible power supply with an energy storage device. It is mainly used to provide uninterruptible power supply to some equipment that requires high power stability. When the power input is normal, the UPS stabilizes the power and supplies it to the load for use. At this time, the UPS is an AC voltage stabilizer, and it also charges the battery in the machine; when the power is interrupted (accidental power outage or fault power failure), the UPS immediately uses the DC power of the battery to continue to supply 220V AC power to the load through the inverter switching conversion method, so that the load maintains normal operation. UPS equipment usually provides protection for overvoltage or undervoltage. After the electromagnetic coil 13 is energized, it generates a reverse magnetic field with the permanent magnet moving iron core 5. The reverse magnetic field offsets the adsorption of the permanent magnet on the inner wall. The attraction of the permanent magnet is unbalanced with the elastic potential energy of the energy storage spring 12. The spring is released, driving the lever connecting bracket 6 to rotate around the movable shaft 11, driving the moving contact 7 to engage with the static contact 8, and achieving the effect of releasing the coupling voltage of the charged body in the cabinet. The present invention uses the lever connecting bracket 6, the lower sleeve 2, the fixed frame 10, and the static contact 8 fixed to the upper end of the fixed frame 10 by the insulator 9 to form a connecting rod driving contact device, and the lever connecting bracket 6 and the lower sleeve 2 are both rotatably installed on the horizontal bracket 1, and then the permanent magnet moving iron core 5 that can slide in the lower sleeve is arranged in the lower sleeve 2, and the spring 12 is arranged between the permanent magnet moving iron core 5 and the lower sleeve 2. The adsorption force of the permanent magnet moving iron core 5 is used to contact the bottom of the lower sleeve 2 to resist the elastic force of the spring 12. When it is necessary to close the switch, the electromagnetic coil is energized to apply electromagnetic force to the permanent magnet moving iron core 5. When the electromagnetic force and the spring force are greater than the adsorption force of the permanent magnetic moving core 5, the permanent magnetic moving core 5 is separated from the bottom surface of the lower sleeve 2, and the force between the permanent magnetic moving core 5 and the lower sleeve 2 is instantly reduced. Under the action of the spring, the permanent magnetic moving core 5 can quickly lever the connecting bracket 6 to rotate the moving head 7 and the static contact 8 to achieve the purpose of discharge. This device has the advantages of fast response and maintenance-free, and can be in standby for a long time. Within the safety standard, it can maintain a stable state for a long time when the grounding knife is separated, and can respond quickly to close the switch after power failure, and manual closing can be used at the same time. When the power failure state ends, it is necessary to manually open the switch to prevent the operator from forgetting to open the switch, thereby improving production safety.

Claims

1. An induction type high voltage switch cabinet grounding switch device, It is characterized in that The invention comprises a lever connection bracket (6), a lower sleeve (2), a fixing bracket (10), and a stationary contact (8) fixed to the upper end of the fixing bracket (10) via an insulator (9), the stationary contact (8) being electrically connected to a live wire row, a transverse bracket (1) being provided on one side of the fixing bracket (10), the lower end of the lever connection bracket (6) being rotatably connected to the transverse bracket (1), a moving contact (7) being able to contact the stationary contact (8) being fixed to the upper end of the lever connection bracket (6), the moving contact (7) being electrically connected to a grounding row, the lower end of the lower sleeve (2) being rotatably connected to the transverse bracket (1), a permanent magnetic moving iron core (5) being able to slide in a lower sleeve being provided in the lower sleeve (2), one end of the permanent magnetic moving iron core (5) being sleeved in the lower sleeve (2), and a spring (1) being provided in the lower sleeve (2) 12), one end of the spring (12) contacts one end of the permanent magnetic moving core (5), and the other end contacts the inner bottom of the lower sleeve (2). The other end of the permanent magnetic moving core (5) is rotatably connected to one side of the lever connecting bracket (6). An electromagnetic coil (13) for driving the permanent magnetic moving core (5) to move is provided on the outer side of the lower sleeve (2). When the end of the permanent magnetic moving core (5) contacts the inner bottom of the lower sleeve (2), the adsorption force between the permanent magnetic moving core (5) and the lower sleeve (2) is greater than the elastic force of the spring. After the electromagnetic coil (13) is energized, the permanent magnetic moving core (5) is subjected to the electromagnetic magnetic field force and the elastic force of the spring, which is greater than the adsorption force between the permanent magnetic moving core (5) and the lower sleeve (2). A groove is provided at one end of the permanent magnetic moving core (5), and one end of the spring (12) is arranged in the groove.

2. An induction type high voltage switch cabinet grounding switch device according to claim 1, It is characterized in that A boss is provided on the permanent magnetic moving iron core (5), one end of the iron core of the permanent magnetic moving iron core (5) is inserted into the spring (12), and the end of the spring (12) contacts the end surface of the boss on the permanent magnetic moving iron core (5).

3. The induction type high voltage switch cabinet grounding switch device according to claim 1, It is characterized in that The lower end of the lever connecting bracket (6) is rotatably connected to the transverse bracket (1) via a movable shaft (11). When the end of the permanent magnetic moving iron core (5) contacts the inner bottom of the lower sleeve (2), the axis of the permanent magnetic moving iron core (5) does not pass through the rotation center of the lower end of the lever connecting bracket (6).

4. The induction type high voltage switch cabinet grounding switch device according to claim 1, It is characterized in that The lower end of the lower sleeve (2) is rotatably connected to the transverse bracket (1) via a rotating pin.

5. The induction type high voltage switch cabinet grounding switch device according to claim 1, It is characterized in that An electromagnetic coil slot is provided on the outer ring of the lower sleeve (2), and the electromagnetic coil is diffracted in the electromagnetic coil slot. An outer cover is provided on the outer side of the electromagnetic coil slot, and a terminal (3) connected to the electromagnetic coil is provided on the outer cover. A power source is connected via the terminal (3).

6. The induction type high voltage switch cabinet grounding switch device according to claim 1, It is characterized in that It also includes a controller for controlling the on and off of the electromagnetic coil. The controller is connected to the high-voltage electrical cabinet through a voltage detection module, and the voltage detection module is used to detect the voltage condition of the high-voltage electrical cabinet.

7. The induction type high voltage switch cabinet grounding switch device according to claim 1, It is characterized in that The fixing frame (10) and the transverse support (1) are an integral structure.

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