Remote operation device of drawer type circuit breaker and drawer type circuit breaker

Abstract

The utility model discloses a remote operation device of a drawer type circuit breaker. The drawer type circuit breaker comprises a circuit breaker body, a drawer seat and a drawer seat transmission device, wherein the drawer seat transmission device is used for driving the circuit breaker body to be rocked in and out of the drawer seat under the driving of external force; the remote operation device comprises an input power supply circuit, a motor, a driving power supply module, a position locking module, a position indicating mechanism, an unlocking mechanism and a remote operation control module. The utility model also discloses a drawer type circuit breaker. Compared with the prior art, the drawer seat is automatically operated to be rocked in and out of the circuit breaker body through remote control, circuit disconnection is autonomously realized at a specified position, an autonomous stopping function at the specified position is realized, and possible harm to operators in the operation process of the drawer type circuit breaker can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a remote operation device for a draw-out circuit breaker. Background Art

[0002] Draw-out circuit breakers are widely used in low-voltage systems due to their isolation function, convenient maintenance, and quick replacement. The draw-out circuit breaker usually includes a circuit breaker body, a drawer base, and a drawer base transmission device. The drawer base transmission device can drive the circuit breaker body to be inserted and withdrawn in the drawer base under the drive of an external force. At present, a three-position interlock device is usually set on the drawer base of the draw-out circuit breaker, and the circuit breaker is only allowed to be switched on and off when the circuit breaker body is located at the "connected", "test", and "disconnected" three positions inside, in the middle, and outside the drawer base respectively. At the same time, in order to facilitate operation, a three-position indicating device is set on the circuit breaker to visually display the state of the circuit breaker.

[0003] When inserting or withdrawing the circuit breaker body of the existing draw-out circuit breaker, the operator still stands in front of the circuit breaker and uses a hand crank to achieve it. However, as a large-capacity switching element, arc flash during operation is one of the main hazards. Once arc flash occurs, it will instantaneously release strong heat waves, light waves, and pressure waves, which will not only damage the switchgear and equipment inside the cabinet, but also burn and impact maintenance personnel, and may even cause casualties in severe cases. In order to reduce the risk of arc flash, common technologies include: increasing the working distance, reducing the short-circuit current, and increasing the conductor spacing, etc. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a remote operation device for a draw-out circuit breaker, which can automatically operate the insertion and withdrawal of the circuit breaker body in the drawer base through remote control, thereby improving the safety of the draw-out circuit breaker.

[0005] The utility model specifically adopts the following technical solutions to solve the above technical problems:

[0006] A remote operation device for a draw-out circuit breaker, the draw-out circuit breaker includes a circuit breaker body, a drawer base, and a drawer base transmission device, and the drawer base transmission device is used to drive the circuit breaker body to be inserted and withdrawn in the drawer base under the drive of an external force; the remote operation device includes:

[0007] An input power supply circuit for providing an input power supply for the remote operation device;

[0008] A motor for providing the external force drive for the drawer base transmission device;

[0009] A drive power supply module for converting the input power supply into a DC drive power supply required by the motor;

[0010] A position locking module, which consists of a locking switch having a pair of normally closed contacts and a pair of normally open contacts. The pair of normally closed contacts of the locking switch are connected in series with the drive power module across both ends of the input power supply, and the pair of normally open contacts of the locking switch are connected across both ends of the input power supply;

[0011] A position indicating mechanism, which is used to trigger the disconnection of the normally closed contacts of the locking switch and the closure of the normally open contacts when the circuit breaker body is at a set of specified positions in the drawer base;

[0012] An unlocking mechanism, which is used to drive the normally closed contacts of the locking switch to close when powered;

[0013] A remote operation control module, which is remotely electrically connected to other components in the remote operation device and includes a changeover switch, an operation switch, an emergency stop switch, and a position unlocking switch. The changeover switch, the operation switch, and the emergency stop switch are connected in series with the motor between the two output terminals of the drive power module. The switching of the two pairs of changeover contacts of the changeover switch can change the direction of the drive current of the motor, thereby controlling the forward and reverse rotation of the motor. The position unlocking switch is used to control the power-on and power-off of the unlocking mechanism.

[0014] Further, the remote operation device of the draw-out circuit breaker further includes:

[0015] A position and status display module, which includes a set of position display circuits corresponding one-to-one to the set of specified positions and a position locking status indicator light. Each position display circuit consists of at least one microswitch and a position indicator light connected in series across both ends of the input power supply. The microswitch is triggered to close by the position indicating mechanism when the circuit breaker body is at the corresponding specified position in the drawer base. The position locking status indicator light is connected in series with the normally open contacts of the locking switch and then connected across both ends of the input power supply.

[0016] Further preferably, the position locking status indicator light, the position indicator lights of the position and status display module, and the remote operation control module are integrated on a handheld terminal and are remotely electrically connected to other components in the remote operation device.

[0017] Preferably, the set of specified positions includes the connection position, the test position, and the separation position where the circuit breaker body is located inside, in the middle, and outside the drawer base respectively.

[0018] Preferably, the input power supply circuit includes an overcurrent protector, a power switch, and a power indicator light connected in series between the single-phase power supply L and N of the power grid.

[0019] Preferably, the drive power module is a rectifier bridge.

[0020] Preferably, the changeover switch is a knob-type changeover switch, and the operation switch and the emergency stop switch are both push-button switches.

[0021] Based on the same inventive concept, the following technical solutions can also be obtained:

[0022] A drawer-type circuit breaker includes a circuit breaker body, a drawer base, and a drawer base transmission device. The drawer base transmission device is used to drive the circuit breaker body to move in and out of the drawer base under the drive of an external force; this drawer-type circuit breaker further includes the remote operation device described in any of the above technical solutions.

[0023] Compared with the prior art, the utility model has the following beneficial effects:

[0024] The utility model automatically operates the circuit breaker body to move in and out of the drawer base through remote control, and independently realizes the disconnection of the circuit at a specified position, achieving the independent stop function at the specified position, which can effectively reduce the possible harm to the operator during the operation of the drawer-type circuit breaker. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of the circuit structure of a specific embodiment of the utility model. Detailed Embodiments

[0026] Aiming at the possible harm to the operator during the operation of moving the circuit breaker body in and out of the drawer base of the existing drawer-type circuit breaker, the solution idea of the utility model is to automatically operate the circuit breaker body to move in and out of the drawer base through remote control, and independently realize the disconnection of the circuit at a specified position, achieving the independent stop function at the specified position, thereby effectively reducing the possible harm to the operator during the operation of the drawer-type circuit breaker.

[0027] The utility model specifically adopts the following technical solutions to solve the above technical problems:

[0028] A remote operation device for a drawer-type circuit breaker. The drawer-type circuit breaker includes a circuit breaker body, a drawer base, and a drawer base transmission device. The drawer base transmission device is used to drive the circuit breaker body to move in and out of the drawer base under the drive of an external force; the remote operation device includes:

[0029] An input power supply circuit for providing an input power supply for the remote operation device;

[0030] A motor for providing the external force drive for the drawer base transmission device;

[0031] A drive power supply module for converting the input power supply into a DC drive power supply required by the motor;

[0032] A position locking module, which is composed of a locking switch having a pair of normally closed contacts and a pair of normally open contacts. A pair of normally closed contacts of the locking switch are connected in series with the drive power supply module and connected to both ends of the input power supply, and a pair of normally open contacts of the locking switch are connected to both ends of the input power supply;

[0033] A position indicating mechanism for triggering the opening of the normally closed contact and the closing of the normally open contact of a locking switch when the circuit breaker body is at a set of designated positions in the drawer base.

[0034] An unlocking mechanism for driving the normally closed contact of the locking switch to close when powered.

[0035] A remote operation control module, remotely electrically connected to other components in the remote operation device, which includes a changeover switch, an operation switch, an emergency stop switch, and a position unlocking switch; the changeover switch, the operation switch, and the emergency stop switch are connected in series between two output terminals of a drive power module, and the switching of two pairs of changeover contacts of the changeover switch can change the driving current direction of the motor to control the forward and reverse rotation of the motor; the position unlocking switch is used to control the power-on and power-off of the unlocking mechanism.

[0036] Further, the remote operation device of the draw-out circuit breaker further includes:

[0037] A position and status display module, including a set of position display circuits corresponding one-to-one to the set of designated positions and a position locking status indicator light; each position display circuit is composed of at least one microswitch and a position indicator light connected in series between both ends of an input power supply, and the microswitch is triggered to close by the position indicating mechanism when the circuit breaker body is at the corresponding designated position in the drawer base; the position locking status indicator light is connected in series with the normally open contact of the locking switch and then connected to both ends of the input power supply.

[0038] Further preferably, the position locking status indicator light, the position indicator light of the position and status display module, and the remote operation control module are integrated on a handheld terminal and remotely electrically connected to other components in the remote operation device.

[0039] Preferably, the set of designated positions includes the connection position, the test position, and the separation position where the circuit breaker body is located inside, in the middle, and outside the drawer base respectively.

[0040] Preferably, the input power supply circuit includes an overcurrent protector, a power switch, and a power indicator light connected in series between the single-phase power supply L and N of the power grid.

[0041] Preferably, the drive power module is a rectifier bridge.

[0042] Preferably, the changeover switch is a rotary changeover switch, and the operation switch and the emergency stop switch are both push-button switches.

[0043] Based on the same inventive concept, the following technical solutions can also be obtained:

[0044] A drawer-type circuit breaker includes a circuit breaker body, a drawer base, and a drawer base transmission device. The drawer base transmission device is used to drive the circuit breaker body to be inserted and removed in the drawer base under the drive of an external force. The drawer-type circuit breaker further includes the remote operation device described in any of the above technical solutions.

[0045] For the convenience of public understanding, the technical solutions of the present invention will be described in detail below through a specific embodiment in conjunction with the accompanying drawings:

[0046] The remote operation device in this embodiment includes: an input power supply circuit, a motor, a drive power module, a position locking module, a position indicating mechanism, an unlocking mechanism, a remote operation control module, and a position and status display module; its specific circuit is as Figure 1 shown.

[0047] As Figure 1 shown, the input power supply circuit in this embodiment consists of an overcurrent protector FU1, a power switch QS1, and a power indicator LED1 connected in series between the grid power supply L and N. The power supply L and N take single-phase power. When the power switch QS1 is turned on, the single-phase power supply L and N are input, and the power indicator LED1 lights up. The overcurrent protector FU1 can be a protection device such as a fuse to perform overcurrent protection on the input side of the entire remote operation device. When the overcurrent protector FU1 is protected, when the power switch QS1 is turned on, the indicator LED1 is dim, indicating that there is an overcurrent fault in the circuit of the entire remote operation device. After disconnecting the power switch QS1, troubleshoot the overcurrent fault in the circuit of the remote operation device, replace the overcurrent protector FU1, and then allow the power switch QS1 to be turned on again.

[0048] As Figure 1 shown, the drive power module in this embodiment consists of a rectifier bridge B1, and the position locking module consists of a microswitch P1; a pair of normally closed contacts of the microswitch P1 are connected in series with the rectifier bridge B1 and connected to both ends of the input power supply, and a pair of normally open contacts of the microswitch P1 are connected to both ends of the input power supply; when the circuit breaker body is at the connection position, test position, and separation position in the drawer base, the position indicating mechanism (which is a mechanical structure provided on the drawer base and / or the circuit breaker body and is used to trigger the corresponding microswitch to act when the circuit breaker body is at a preset position in the drawer base, Figure 1 not shown in the figure) triggers the normally closed contacts of the microswitch P1 to disconnect and the normally open contacts to close.

[0049] As Figure 1 shown, the motor M is provided with a DC drive power supply by the rectifier bridge B1, and its transmission shaft is mechanically connected to the drawer base transmission device. When the motor rotates forward, the drawer base transmission device makes the circuit breaker body be removed from the drawer base. When the motor rotates backward, the drawer base transmission device makes the circuit breaker body be inserted into the drawer base; of course, vice versa.

[0050] As Figure 1 shown, the unlocking mechanism in this embodiment uses an electromagnet L, which is mechanically coupled with a microswitch P1. When the electromagnet L is energized, it can drive the normally closed contact of the microswitch P1 to close.

[0051] As Figure 1 shown, the remote operation control module in this embodiment includes a changeover switch P3, an operation button P5, an emergency stop button SB, and a position unlocking key P7. The changeover switch P3, the operation button P5, and the emergency stop button SB are connected in series with the motor M between the two output terminals of the rectifier bridge B1; two pairs of changeover contacts of the changeover switch P3 can make one pair of changeover contacts connect to both ends of the motor M by rotating the knob of the changeover switch. By rotating the knob to switch the two pairs of changeover contacts of the changeover switch P3, the driving current direction of the motor M can be changed, thereby controlling the forward and reverse rotation of the motor M; the position unlocking key P7 is connected in series with the electromagnet L across the input power supply terminals. When the position unlocking key P7 is pressed, the electromagnet L is energized to drive the normally closed contact of the microswitch P1 to close, thereby realizing the unlocking of the position locking module; the remote operation control module is electrically connected to other components through wires, thereby avoiding the risks brought by the operator's close operation.

[0052] As Figure 1 shown, the position and status display module in this embodiment includes three position display circuits corresponding to the connection position, the test position, and the separation position one by one, and a position locking status indicator LED5; the position display circuit at the separation position is composed of a microswitch K1 and a separation position indicator LED2 connected in series across the input power supply terminals, the position display circuit at the test position is composed of a microswitch K2 and a test position indicator LED3 connected in series across the input power supply terminals, and the position display circuit at the connection position is composed of a microswitch K3 and a connection position indicator LED4 connected in series across the input power supply terminals; the microswitches K1, K2, and K3 are triggered to close by the position indicating mechanism when the circuit breaker body is at the separation position, the test position, and the connection position in the drawer seat respectively; the position locking status indicator LED5 is connected in series with the normally open contact of the microswitch P1 across the input power supply terminals; in order to facilitate the operator to observe the position information and the locking status during operation, the position and status display module in this embodiment is integrated with the remote operation control module on a handheld terminal and is remotely electrically connected to other components through wires.

[0053] When the operator needs to perform the operation of pushing in or out the circuit breaker body, first turn on the power switch QS1, and the single-phase power supply L and N are input, and the power indicator LED1 lights up. At the same time, the input power supply circuit is connected to the micro switches K1, K2, and K3, and the position indicating mechanism outputs the current position state of the circuit breaker to the micro switches K1, K2, and K3. According to the output signal of the micro switch K1 or K2 or K3, a certain indicator LED among LED2, LED3, and LED4 in the indicating unit of the remote control unit will light up. Among them, when the indicator LED2 lights up, it means the "disconnected" position; when the indicator LED3 lights up, it means the "test" position; when the indicator LED4 lights up, it means the "connected" position.

[0054] If the indicator LED5 lights up at this time, it means that the normally open contact of the micro switch P1 of the position locking module is closed to output a locking signal. At this time, the normally closed contact connecting the micro switch P1 and the rectifier bridge B1 is disconnected, and the normal working power supply for the motor M cannot be provided. It is necessary to press the unlocking key P7 to unlock the position of the position locking module through the electromagnet. The micro switch P1 restores the normally closed contact to be closed and the normally open contact to be disconnected. At this time, the indicator LED5 goes dark and the normal power supply for the motor is restored. If the indicator LED5 is dark at this time, it means that the position locking module is in the unlocked state, the normally closed contact of the micro switch P1 is closed, and the motor M is normally powered.

[0055] Taking the drawer seat in the "connected" position and the circuit breaker body being pushed out from the drawer seat to the "test" position as an example, at this time, the position indicating mechanism outputs the current position state of the circuit breaker to the micro switch K3, the indicator LED4 lights up, and the indicator LED5 is dark. Rotate the knob of the changeover switch P3 to select the "OUT" gear, press and hold the operation button P5 to turn on the power supply of the motor M, and the motor M will rotate forward and output to the drawer seat transmission device to push the circuit breaker body out of the drawer seat and reach the "test" position. At this time, the position indicating mechanism outputs the current position state of the circuit breaker to the micro switch K2, the indicator LED4 changes from bright to dark, and the indicator LED3 changes from dark to bright. When the drawer seat is in the "test" position, the position indicating mechanism outputs a locking signal to the micro switch P1, the normally closed contact of the micro switch P1 is disconnected, and the normal working power supply for the motor cannot be provided. The normally open contact is closed, and the indicator LED5 lights up.

[0056] If it is necessary to further shake out the circuit breaker body from the drawer base from the "test" position to the "separation" position, the unlocking key P7 needs to be pressed to unlock the position of the position locking module through the electromagnet. The microswitch P1 restores the normally closed contact to close and the normally open contact to open. At this time, the indicator light LED5 goes out and the normal power supply to the motor is restored. At this time, the position indicating mechanism outputs the current position state of the circuit breaker to the microswitch K2, the indicator light LED3 lights up, and the indicator light LED5 goes out. The knob of the changeover switch P3 is rotated to select the "OUT" gear, and the operation button P5 is pressed and held to connect the power supply of the motor M. The motor M will rotate forward and output to the drawer base transmission device to shake out the circuit breaker body from the drawer base and reach the "separation" position. At this time, the position indicating mechanism outputs the current position state of the circuit breaker to the microswitch K1, the indicator light LED3 changes from bright to dark, and the indicator light LED2 changes from dark to bright. When the drawer base is in the "separation" position, the position indicating mechanism outputs a locking signal to the microswitch P1 for position locking. The normally closed contact of the microswitch P1 is disconnected and cannot provide the normal working power supply for the motor. The normally open contact is closed and the indicator light LED5 lights up.

[0057] Conversely, the functions of shaking in and shaking out are similar. Just select the "IN" gear on the changeover switch P3 to sequentially realize the functions of the circuit breaker body and the circuit breaker drawer base from the "separation", "test", and "connection" positions.

[0058] If an emergency stop is required, press the emergency stop key SB in the remote control unit, and the motor will immediately stop until the emergency stop key SB fails.

Claims

1. A remote operation device for a draw-out circuit breaker, the draw-out circuit breaker comprising a circuit breaker body, a draw-out base, and a draw-out base transmission device, the draw-out base transmission device being configured to drive the circuit breaker body to be rocked in and out of the draw-out base under the drive of an external force; characterized in that, The remote operation device includes: An input power circuit for providing input power to the remote operation device; A motor for providing the external force drive to the drawer seat transmission device; A drive power module for converting the input power into the DC drive power required by the motor; A position locking module composed of a locking switch having a pair of normally closed contacts and a pair of normally open contacts. A pair of normally closed contacts of the locking switch are connected in series with the drive power module across the two ends of the input power supply, and a pair of normally open contacts of the locking switch are connected across the two ends of the input power supply; A position indicating mechanism for triggering the normally closed contacts of the locking switch to open and the normally open contacts to close when the circuit breaker body is at a set of specified positions in the drawer seat; An unlocking mechanism for driving the normally closed contacts of the locking switch to close when powered on; A remote operation control module is remotely electrically connected to other components in the remote operation device. It includes a changeover switch, an operation switch, an emergency stop switch, and a position unlocking switch. The changeover switch, the operation switch, and the emergency stop switch are connected in series with the motor between the two output terminals of the drive power module. The switching of the two pairs of changeover contacts of the changeover switch can change the driving current direction of the motor, thereby controlling the forward and reverse rotation of the motor. The position unlocking switch is used to control the power-on and power-off of the unlocking mechanism.

2. The remote operation device of the drawer-type circuit breaker according to claim 1, characterized in that, It further includes: A position and status display module, including a set of position display circuits corresponding one-to-one to the set of specified positions and a position locking status indicator light; Each position display circuit is composed of at least one microswitch and a position indicator light connected in series between the two ends of the input power supply. The microswitch is triggered to close by the position indicating mechanism when the circuit breaker body is at the corresponding specified position in the drawer seat; The position locking status indicator light is connected in series with the normally open contacts of the locking switch and then connected across the two ends of the input power supply.

3. The remote operation device of the drawer-type circuit breaker according to claim 2, characterized in that, The position locking status indicator light, the position indicator lights of the position and status display module, and the remote operation control module are integrated on a handheld terminal and are remotely electrically connected to other components in the remote operation device.

4. The remote operation device of the drawer-type circuit breaker according to claim 1, characterized in that, The set of specified positions includes the connection position, the test position, and the separation position where the circuit breaker body is located inside, in the middle, and outside the drawer seat respectively.

5. The remote operation device of the drawer-type circuit breaker according to claim 1, characterized in that, The input power circuit includes an overcurrent protector, a power switch, and a power indicator light connected in series between the single-phase power supply L and N of the power grid.

6. The remote operation device of the drawer-type circuit breaker according to claim 1, characterized in that, The drive power module is a rectifier bridge.

7. The remote operation device of the drawer-type circuit breaker according to claim 1, characterized in that, The changeover switch is a rotary changeover switch, and the operation switch and the emergency stop switch are both push-button switches.

8. A drawer-type circuit breaker, comprising a circuit breaker body, a drawer base, and a drawer base transmission device, wherein the drawer base transmission device is used to drive the circuit breaker body to be inserted and withdrawn in the drawer base under the drive of an external force; characterized in that, This draw-out circuit breaker further includes the remote operation device according to any one of claims 1 to 7.

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