Circuit breaker and power system

Abstract

The utility model provides a circuit breaker and a power system, and the circuit breaker comprises a contact switch assembly which is configured to control the on-off of a power line; the tripping unit is in transmission connection with the contact switch assembly, and the tripping unit is configured to control the contact switch assembly; the protection unit is coupled with the power line, and the protection unit is configured to output a control signal according to the current magnitude of the power line; wherein the tripping unit triggers the contact switch assembly to be switched off only when the power line has a first type of fault, and the protection unit outputs a first control signal only when the power line has a second type of fault; the first control signal is configured to control a target switching device to be turned off, and the target switching device is configured to turn off the power line. The circuit breaker does not need to be manually reset after protection of various circuits, so that the operation and maintenance workload of power maintenance personnel is reduced.

Description

Technical Field

[0001] This application relates to the field of power technology, specifically to a circuit breaker and a power system. Background Technology

[0002] Currently, circuit breakers are crucial protective devices in power systems, capable of providing functions such as short-circuit protection, overload protection, locked rotor protection, and undervoltage protection. They are widely used in fields such as household electricity, industrial electricity, photovoltaic power generation, energy storage battery management, and data cabinet power distribution management.

[0003] In related technologies, circuit breakers typically cannot automatically reset after performing short-circuit protection, overload protection, locked-rotor protection, or undervoltage protection, requiring power maintenance personnel to manually operate the circuit breaker handle for reset. However, when the circuit breaker is installed in a location inconvenient for manual operation (such as the control cabinet on top of a wind turbine), manually resetting the circuit breaker under all protection conditions would increase the workload of power maintenance personnel. Utility Model Content

[0004] This application provides a circuit breaker and a power system, which are intended to solve the above-mentioned technical problems.

[0005] In a first aspect, this application provides a circuit breaker, comprising:

[0006] A contact switch assembly configured to control the on / off state of a power supply line;

[0007] The tripping unit is drive-connected to the contact switch assembly, and the tripping unit is configured to control the tripping of the contact switch assembly;

[0008] The protection unit is coupled to the power line and electrically connected to the target switching device. The protection unit is configured to output a control signal to the target switching device according to the magnitude of the current in the power line.

[0009] The tripping unit only trips the contact switch assembly when a first type of fault occurs in the power line, and the protection unit only outputs a first control signal to the target switching device when a second type of fault occurs in the power line.

[0010] The first control signal is configured to control the target switching device to open, and the target switching device is configured to disconnect the power line.

[0011] In some embodiments, the current value when the power line experiences a first-type fault is greater than the current value when the power line experiences a second-type fault.

[0012] In some embodiments, the first type of fault includes a short-circuit fault;

[0013] The second category of faults includes overload faults and / or stall faults.

[0014] In some embodiments, the protection unit includes a current detector and a control circuit;

[0015] The current detector is coupled to the power line and is configured to detect the magnitude of the current in the power line.

[0016] The control circuit is electrically connected to the current detector and is configured to output a control signal based on the magnitude of the current in the power supply line.

[0017] In some embodiments, the circuit breaker has a first output terminal and a second output terminal, the first output terminal and the second output terminal being configured to connect to a target switching device, and the control circuit includes a control chip and a first switch.

[0018] The control chip is electrically connected to the current detector, and the control chip is configured to output an enable signal according to the magnitude of the current in the power line.

[0019] The first switch is electrically connected to the first output terminal, and the first switch is also electrically connected to the second output terminal;

[0020] The enable signal is used to control the first switch. When a second type of fault occurs in the power line, the first switch disconnects the path between the first output terminal and the second output terminal.

[0021] In some embodiments, the circuit breaker also has a third output terminal, wherein the first output terminal and the third output terminal are configured to connect to a fault indicator light;

[0022] The first switch is also electrically connected to the third output terminal. When a second type of fault occurs in the power line, the first switch will connect the first output terminal and the third output terminal.

[0023] In some embodiments, the protection unit has an automatic reset mode;

[0024] When the protection unit is in automatic reset mode, the protection unit outputs a second control signal after a preset time interval after outputting the first control signal;

[0025] The second control signal is configured to control the target switch device to close.

[0026] In some embodiments, the protection unit also has a manual reset mode;

[0027] When the protection unit is in manual reset mode, the protection unit outputs a second control signal after manual power-off and restart;

[0028] The second control signal is configured to control the target switching device to close.

[0029] In some embodiments, the circuit breaker has a first auxiliary power supply terminal and a second auxiliary power supply terminal;

[0030] The first auxiliary power terminal and the second auxiliary power terminal are electrically connected to the protection unit, and the first auxiliary power terminal and the second auxiliary power terminal are electrically connected to the target auxiliary power supply.

[0031] In some embodiments, the circuit breaker includes a rotary switch that is electrically connected to the protection unit.

[0032] When the rotary switch is turned to the first position, the protection unit switches to automatic reset mode;

[0033] When the rotary switch is turned to the second position, the protection unit switches to manual reset mode.

[0034] In some embodiments, the first gear position includes multiple first sub-gear positions, and when the rotary switch is rotated to different first sub-gear positions, the current in the power line is not equal when the protection unit outputs the first control signal; and / or

[0035] The second position includes multiple second sub-positions. When the rotary switch is turned to different second sub-positions, the current in the power line is not equal when the protection unit outputs the first control signal.

[0036] In some embodiments, the contact switch assembly includes a contact switch and an operating mechanism;

[0037] The contact switch is configured to control the on / off state of the power supply line, the operating mechanism is drivenly connected to the contact switch, and the operating mechanism is drivenly connected to the tripping unit;

[0038] When a Class I fault occurs in the power cord, the trip unit triggers the operating mechanism, which in turn triggers the contact switch to disconnect the power cord.

[0039] Secondly, this application provides an electric power system, comprising:

[0040] The circuit breaker and target switching device as described in the first aspect;

[0041] The circuit breaker disconnects only when a Class I fault occurs in the power system, and the target switching device disconnects only when a Class II fault occurs in the power system.

[0042] When a first-type fault occurs in the power line, this application uses a tripping unit to trigger the contact switch assembly to disconnect, thereby achieving circuit protection for the first-type fault. When a second-type fault occurs in the power line, the protection unit outputs a first control signal to control the target switch device to disconnect, thereby causing the target switch device to disconnect the power line for circuit protection against the second-type fault. In other words, this application only needs to disconnect the contact switch assembly of the circuit breaker when a first-type fault occurs. This means that it is not necessary to manually reset the circuit breaker after various circuit protections, which helps to reduce the workload of power maintenance personnel. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0044] Figure 1 A schematic diagram of a circuit breaker according to an embodiment of this application is shown;

[0045] Figure 2 Another schematic diagram of the circuit breaker in an embodiment of this application is shown;

[0046] Figure 3 Another schematic diagram of the circuit breaker in an embodiment of this application is shown;

[0047] Figure 4 Another schematic diagram of the circuit breaker in an embodiment of this application is shown;

[0048] Figure 5 Another schematic diagram of the circuit breaker in an embodiment of this application is shown;

[0049] Figure 6 Another schematic diagram of the circuit breaker in an embodiment of this application is shown;

[0050] Figure 7 Another schematic diagram of the circuit breaker in an embodiment of this application is shown;

[0051] Figure 8 A schematic diagram of the appearance of a circuit breaker according to an embodiment of this application is shown.

[0052] Among them, 1 power cord, 100 circuit breaker, 101 first output terminal, 102 second output terminal, 103 third output terminal, 104 first auxiliary power terminal, 105 second auxiliary power terminal, 106 rotary switch, and 200 target switching device.

[0053] 10 Contact switch assembly, 11 Contact switch, 12 Operating mechanism, 20 Tripping unit, 30 Protection unit, 31 Current detector, 32 Control circuit, 321 Control chip, 322 First switch. Detailed Implementation

[0054] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0055] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0056] In this application, the term "exemplary" is used to mean "serving as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use the present invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the present invention can be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the present invention with unnecessary detail. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0057] This application provides a circuit breaker 100 and a power system, which will be described in detail below.

[0058] First, refer to Figure 1 , Figure 1 A schematic diagram of a circuit breaker 100 in an embodiment of this application is shown, wherein the circuit breaker 100 includes a contact switch assembly 10, a tripping unit 20, and a protection unit 30.

[0059] The contact switch assembly 10 is configured to control the on / off state of the power line 1, which can be a DC power line or an AC power line, such as a three-phase power line or a single-phase power line. In some embodiments of this application, see [reference needed]. Figure 2 , Figure 2 The diagram shows another schematic of the circuit breaker 100 according to an embodiment of this application. The contact switch assembly 10 may include a contact switch 11 and an operating mechanism 12. The contact switch 11 is configured to control the opening and closing of the power line 1. The contact switch 11 may include a stationary contact and a moving contact. The stationary contact is electrically connected to the power line 1, and the movement of the moving contact is driven by the operating mechanism 12 to realize the opening and closing process of the stationary contact and the moving contact. The operating mechanism 12 is connected to the contact switch 11 (e.g., the moving contact of the contact switch 11). The operating mechanism 12 may include a latch, a spring, or other mechanical structural components that drive the contact switch 11 (e.g., the moving contact of the contact switch 11) to perform switching actions, thereby realizing the on / off control of the power line 1.

[0060] As will be understood by those skilled in the art, the contact switch assembly 10 may also be provided with other mechanical components to achieve the corresponding functions. For example, the contact switch assembly 10 may also be provided with an arc-extinguishing structure to extinguish the electric arc generated by the current interruption the moment the contact switch 11 disconnects the circuit.

[0061] The trip unit 20 is drive-connected to the contact switch assembly 10, and the trip unit 20 is configured to control the tripping of the contact switch assembly 10. For example, taking the contact switch assembly 10 as including the contact switch 11 and the operating mechanism 12, when a fault occurs in the power line 1 (e.g., a first-type fault), the trip unit 20 can activate the operating mechanism 12 (e.g., the latch of the operating mechanism 12), and then the operating mechanism 12 (e.g., the latch of the operating mechanism 12) changes the closed state of the contact switch 11, where the moving contact is in contact with the stationary contact, to the open state, where the moving contact is separated from the stationary contact.

[0062] In some embodiments of the application, the trip unit 20 may include an electromagnetic trip unit, and the current trip unit may be connected to the power line 1. When the current in the power line 1 exceeds a set threshold, the magnetic force generated by the electromagnet of the current trip unit overcomes the resistance of the spring of the current trip unit, thereby causing the mechanical structure of the current trip unit (e.g., telescopic rod) to trigger the operating mechanism 12 (e.g., the latch of the operating mechanism 12), and finally the operating mechanism 12 triggers the contact switch 11 to trip.

[0063] It is understandable that the trip unit 20 may also use other trip units, such as thermal trip units, undervoltage trip units, or dual trip units.

[0064] The protection unit 30 is coupled to the power line 1 and electrically connected to the target switching device 200. The protection unit 30 is configured to output a control signal to the target switching device 200 according to the current of the power line 1. For example, when the current of the power line 1 exceeds the set overload current, the protection unit 30 can output a control signal to realize circuit overload protection. For another example, when the current of the power line 1 exceeds the set stall current to prevent the motor from stalling (i.e., the motor rotor is stuck due to excessive load or mechanical failure), the protection unit 30 can also output a control signal to realize motor stall protection.

[0065] In some embodiments of this application, the protection unit 30 may include an electromagnetic switch. When the current in the power line 1 exceeds a set overload or stall current, the electromagnet of the electromagnetic switch generates magnetic force to overcome the switch resistance and open or close the circuit, thereby controlling whether a control signal is output. In some embodiments of this application, the protection unit 30 may include a voltage comparator, a current comparator, etc., which determine whether the current in the power line 1 exceeds a set overload or stall current, and then output a level signal as a control signal.

[0066] In this embodiment, the tripping unit 20 triggers the contact switch assembly 10 to disconnect only when a first type of fault occurs in the power line 1, and the protection unit 30 outputs a first control signal to the target switching device 200 only when a second type of fault occurs in the power line 1. The first control signal is configured to control the target switching device 200 to disconnect, and the target switching device 200 is configured to disconnect the power line 1.

[0067] It should be noted that the target switch device 200 can be a switch that can be remotely controlled or installed in a location that is convenient for power maintenance personnel to operate. For example, the target switch device 200 can be a contactor that can also control the on and off of the power line 1. Compared with the circuit breaker 100 of the control cabinet on the top of the wind turbine, the contactor can be installed on the ground or the contactor can be remotely controlled.

[0068] It is understood that the above embodiments use a contactor as an exemplary embodiment of the target switching device 200, but the actual implementation is not limited to this. The target switching device 200 can also be a switch for other devices in the power system. For example, the target switching device 200 can also be a power switch inside a motor. This application does not impose specific limitations. Furthermore, it should be noted that the first control signal can also be a digital signal, controlling the target switching device 200 through wired or wireless communication; or, the first control signal can also be an analog signal. For example, in the embodiment where the target switching device 200 is a contactor, the first control signal can refer to an analog voltage signal supplying power to the contactor or a signal where the supply voltage is 0 when power is off. This application also does not impose specific limitations.

[0069] In some embodiments of this application, a first type of fault may include one or more faults, and a second type of fault may also include one or more faults. For example, a first type of fault may include a short-circuit fault and an overload fault; a second type of fault may include a stalled rotor fault. Alternatively, a first type of fault may include an overload fault; a second type of fault may include a stalled rotor fault and a short-circuit fault. It is understood that those skilled in the art can define the distinction between the first and second types of faults according to actual needs.

[0070] In some embodiments of this application, the current value when the power line 1 experiences a first type of fault is greater than the current value when the power line 1 experiences a second type of fault. For example, the current of a short circuit fault is usually the largest. The first type of fault may include a short circuit fault, and the second type of fault may include an overload fault and / or a stall fault. That is, the trip unit 20 can trigger the contact switch assembly 10 to open when the power line 1 experiences a short circuit fault, thereby realizing circuit short circuit protection. The protection unit 30 can output a first control signal when the power line 1 experiences an overload fault and / or a stall fault, thereby causing the target switch device 200 to open, thereby realizing circuit overload protection and / or stall protection.

[0071] In this embodiment, when a first type of fault occurs in the power line 1, the tripping unit 20 triggers the contact switch assembly 10 to disconnect, thereby achieving circuit protection for the first type of fault. When a second type of fault occurs in the power line 1, the protection unit 30 outputs a first control signal to control the target switch device 200 to disconnect, thereby causing the target switch device 200 to disconnect the power line 1 for circuit protection against the second type of fault. In other words, this application only needs to disconnect the contact switch assembly 10 of the circuit breaker 100 when a first type of fault occurs. This means that it is not necessary to manually reset the circuit breaker 100 after various circuit protections, which helps to reduce the workload of power maintenance personnel.

[0072] Understandably, resetting the target switch 200 after a type II fault is relatively easy since the target switch 200 is a switch that can be remotely controlled or installed in a location that is convenient for power maintenance personnel to operate. Therefore, it will not increase the workload of power maintenance personnel.

[0073] In some embodiments of this application, see Figure 3 , Figure 3 Another schematic diagram of the circuit breaker 100 in an embodiment of this application is shown, wherein the protection unit 30 includes a current detector 31 and a control circuit 32; the current detector 31 is coupled to the power line 1 and is configured to detect the magnitude of the current in the power line 1; the control circuit 32 is electrically connected to the current detector 31 and is configured to output a control signal according to the magnitude of the current in the power line 1.

[0074] For example, when an overload fault and / or a stall fault occurs in power line 1, the current detector 31 detects that the current in power line 1 exceeds the set value of the overload current and / or stall current. Then the control circuit 32 can output a first control signal to control the target switching device 200 to disconnect and realize the overload protection and / or stall protection of the circuit.

[0075] For example, the current detector 31 may be, but is not limited to, a current transformer, a Hall current transformer, a fluxgate current sensor, a Rogowski coil, etc.; the control circuit 32 may include a voltage comparator, a current comparator, etc., and the voltage comparator and the current comparator determine whether the output signal of the current detector 31 exceeds the set value, thereby indirectly determining whether the current of the power line 1 reaches the set value of overload current and / or stall current.

[0076] In some embodiments of this application, such as embodiments where the first control signal is an analog signal, see [link to relevant documentation]. Figure 4 , Figure 4 Another schematic diagram of the circuit breaker 100 in this embodiment is shown, wherein the circuit breaker 100 has a first output terminal 101 and a second output terminal 102, the first output terminal 101 and the second output terminal 102 are configured to be connected to the target switching device 200, the control circuit 32 includes a control chip 321 and a first switch 322; the control chip 321 is electrically connected to the current detector 31, and the control chip 321 is configured to output an enable signal according to the magnitude of the current of the power line 1; the first switch 322 is electrically connected to the first output terminal 101, and the first switch 322 is electrically connected to the second output terminal 102.

[0077] It should be noted that the first output terminal 101 and the second output terminal 102 are connection terminals on the circuit loop of the target switching device 200. The first switch 322 can control the connection between the first output terminal 101 and the second output terminal 102, thereby controlling whether the target switching device 200 is disconnected. The enable signal output by the control chip 321 can control the first switch 322. For example, when a second type of fault occurs in the power line 1 (i.e., the current detector 31 detects that the current exceeds the set value), the enable signal output by the control chip 321 can control the first switch 322 to disconnect the path between the first output terminal 101 and the second output terminal 102. At this time, the first control signal output by the control circuit 32 is a 0 voltage signal, which means that the power circuit of the target switching device 200 (e.g., a contactor) is disconnected. Therefore, the target switching device 200 will disconnect the power line 1 when the power supply is stopped, thereby realizing the second type of fault protection of the power line 1.

[0078] For example, the first switch 322 may be, but is not limited to, a mechanical switch such as an electromagnetic relay switch, or a transistor with switching function such as a MOS switch, an IGBT, or a JEFT.

[0079] It is understood that the implementation of the first control signal output by the control circuit 32 is not limited to this. For example, the control circuit 32 may also include only the control chip 321, and the control circuit 32 may use the enable signal output by the control chip 321 as the first control signal.

[0080] In some embodiments of this application, see Figure 5 , Figure 5 Another schematic diagram of a relay in an embodiment of this application is shown, wherein the circuit breaker 100 further has a third output terminal 103, and the first output terminal 101 and the third output terminal 103 are configured to connect to a fault indicator LED.

[0081] It should be noted that the first switch 322 is also electrically connected to the third output terminal 103. That is, the first switch 322 can be a multi-position mechanical switch, having one moving contact and multiple stationary contacts. When the moving contact of the first switch 322 contacts different stationary contacts, different paths are opened. This allows the first switch 322 to open not only the path between the first output terminal 101 and the second output terminal 102, but also the path between the first output terminal 101 and the third output terminal 103. For example, when a second-type fault occurs in power line 1, the first switch 322 can open the path between the first output terminal 101 and the third output terminal 103. At this time, the power circuit of the fault indicator LED is connected, so the fault indicator LED can light up to indicate that the power system is in a second-type fault state.

[0082] Understandably, control circuit 32 can also control the fault indicator LED via an additional switch to indicate that the power system is in a Class II fault state.

[0083] In some embodiments of this application, the protection unit 30 has an automatic reset mode. When the protection unit 30 is in the automatic reset mode, the protection unit 30 outputs a second control signal after outputting a first control signal at a preset time interval.

[0084] It should be noted that the second control signal is configured to control the target switch device 200 to close. That is, when the protection unit 30 is in automatic reset mode, if the protection unit 30 outputs the first control signal when a second type of fault occurs on the power line 1, the protection unit 30 can output the second control signal after a preset time interval (e.g., 1 minute) after outputting the first control signal, so as to use the second control signal to control the target switch device 200 to close, thereby restoring the power system to normal operation.

[0085] For example, see Figure 5 Taking the protection unit 30, which includes a control chip 321 and a first switch 322, as an example, after a second type of fault occurs in the power line 1, the control chip 321 controls the first switch 322 to disconnect the path between the first output terminal 101 and the second output terminal 102, thereby disconnecting the power circuit of the target switching device 200 and disconnecting the power line 1. After a preset time interval, the control chip 321 will control the first switch 322 to reconnect the path between the first output terminal 101 and the second output terminal 102, thereby connecting the power circuit of the target switching device 200 and connecting the power line 1, thus controlling the power system to return to normal operation.

[0086] In some embodiments of this application, the protection unit 30 also has a manual reset mode; when the protection unit 30 is in the manual reset mode, the protection unit 30 outputs a second control signal after manual power-off and restart.

[0087] It should be noted that after the protection unit 30 is powered off and restarted, it can be reset and output a second control signal. The second control signal is configured to control the target switching device 200 to close. For example, see [reference needed]. Figure 5Taking the protection unit 30, which includes a control chip 321 and a first switch 322, as an example, after a second type of fault occurs in the power line 1, the control chip 321 controls the first switch 322 to disconnect the path between the first output terminal 101 and the second output terminal 102, thereby disconnecting the power circuit of the target switching device 200 and disconnecting the power line 1. After the protection unit 30 is powered off and restarted, the control chip 321 resets and controls the first switch 322 to reconnect the path between the first output terminal 101 and the second output terminal 102, thereby connecting the power circuit of the target switching device 200 and connecting the power line 1, thus controlling the power system to return to normal operation.

[0088] It is understandable that the power-off restart of the protection unit 30 can be controlled locally or remotely. For example, the power supply switch of the protection unit 30 can be controlled to cause the protection unit 30 to power off and restart; or, the auxiliary power supply can be remotely supplied to the protection unit 30 through the power line harness, and the auxiliary power supply can also be controlled to cause the protection unit 30 to power off and restart.

[0089] In some embodiments of this application, see Figure 6 , Figure 6 Another schematic diagram of a relay in an embodiment of this application is shown, wherein the circuit breaker 100 has a first auxiliary power supply terminal 104 and a second auxiliary power supply terminal 105; the first auxiliary power supply terminal 104 and the second auxiliary power supply terminal 105 are electrically connected to the protection unit 30, and the first auxiliary power supply terminal 104 and the second auxiliary power supply terminal 105 are electrically connected to the target auxiliary power supply.

[0090] It should be noted that the target auxiliary power supply can power the protection unit 30 (e.g., control chip 321, current detector 31, etc.). The target auxiliary power supply can include, but is not limited to, various DC / DC converters or AC / DC converters to provide the protection unit 30 with a DC voltage that meets its voltage requirements. Since the first auxiliary power supply terminal 104 and the second auxiliary power supply terminal 105 are electrically connected to the target auxiliary power supply, and the first auxiliary power supply terminal 104 and the second auxiliary power supply terminal 105 are electrically connected to the protection unit 30, the target auxiliary power supply can power the protection unit 30 to ensure its normal operation. At the same time, by controlling the target auxiliary power supply, the protection unit 30 can also be powered off and restarted, thereby realizing remote restoration of the power system to its normal operation.

[0091] In some embodiments of this application, see Figure 7 , Figure 7 Another schematic diagram of a relay in an embodiment of this application is shown, wherein the circuit breaker 100 includes a rotary switch 106, which is electrically connected to the protection unit 30.

[0092] It should be noted that the rotary switch 106 can be an electronic switch. The rotary switch 106 has a first position and a second position. When the rotary switch 106 is turned to the first position, the rotary switch 106 can output an electrical signal to the protection unit 30 (for example, output a high-level signal to the control chip 321), so that the protection unit 30 switches to the automatic reset mode, so that the protection unit 30 outputs the second control signal after a preset time interval after outputting the first control signal. When the rotary switch 106 is turned to the second position, the rotary switch 106 can output an electrical signal to the protection unit 30 (for example, output a low-level signal to the control chip 321), and the protection unit 30 switches to the manual reset mode, so that the protection unit 30 can only output the second control signal after being manually powered off and restarted.

[0093] In some embodiments of this application, the first gear position includes multiple first sub-gear positions, and the current magnitude of the power supply line 1 is not equal when the protection unit 30 outputs the first control signal when the rotary switch 106 is rotated to different first sub-gear positions; and / or, the second gear position includes multiple second sub-gear positions, and the current magnitude of the power supply line 1 is not equal when the protection unit 30 outputs the first control signal when the rotary switch 106 is rotated to different second sub-gear positions.

[0094] For example, see Figure 8 , Figure 8 The diagram shows an appearance of the circuit breaker 100 in an embodiment of this application. The three positions of the rotary switch 106 to the left are the first positions, and the three positions of the rotary switch 106 to the right are the second positions. When the rotary switch 106 is rotated to different first or second sub-positions, the current of the power line 1 is not equal when the protection unit 30 outputs the first control signal.

[0095] For example, when the rotary switch 106 is turned to the first position on the left, overload protection is triggered when the current in power line 1 is 10A, and the protection unit 30 only outputs the first control signal; when the rotary switch 106 is turned to the second position on the left, overload protection is triggered when the current in power line 1 is 15A, and the protection unit 30 only outputs the first control signal; when the rotary switch 106 is turned to the third position on the left, overload protection is triggered when the current in power line 1 is 20A, and the protection unit 30 only outputs the first control signal. The same applies when the rotary switch 106 is turned to each of the second sub-positions, and will not be described in detail here.

[0096] It can be seen that when the rotary switch 106 is rotated to different first or second sub-positions, the current of the power line 1 corresponding to the second type of fault protection triggered by the protection unit 30 is different. Thus, the conditions for triggering the second type of fault can be flexibly adjusted by rotating the rotary switch 106, which is beneficial to improving the application flexibility of the circuit breaker of this application.

[0097] It is worth noting that the above description of the circuit breaker 100 is intended to clearly illustrate the implementation and verification process of this application. Those skilled in the art can make equivalent modifications or further detailed designs under the guidance of this application. For example, refer to... Figure 8 This application may also include a first button switch 107 for manually restarting the protection unit 30, a second button switch 108 for controlling the cessation of the second type of fault protection, and a handle 109 for manually operating the contact switch 11 to close or disconnect the circuit.

[0098] Furthermore, to better implement the target switching device 200 in the embodiments of this application, based on the target switching device 200, this application also provides a power system. The power system includes the target switching device 200 as described in any of the above embodiments, wherein the circuit breaker 100 disconnects only when a first type of fault occurs in the power system, and the target switching device 200 disconnects only when a second type of fault occurs in the power system. Exemplarily, the power system may be, but is not limited to, a charging system, a transformer system, a motor system, a computer room power supply system, a household power supply system, an industrial power supply system, etc. Since the power system in the embodiments of this application is equipped with the target switching device 200 of the above embodiments, it possesses all the beneficial effects of the target switching device 200, which will not be elaborated further here.

[0099] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the detailed descriptions of other embodiments above, which will not be repeated here.

[0100] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0101] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0102] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments of the utility model, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the present application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0103] The circuit breaker and power system provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A circuit breaker, characterized in that, include: A contact switch assembly configured to control the on / off state of a power line; A tripping unit is drive-connected to the contact switch assembly, and the tripping unit is configured to control the contact switch assembly to trip; A protection unit is coupled to the power line and electrically connected to the target switching device. The protection unit is configured to output a control signal to the target switching device according to the magnitude of the current in the power line. The tripping unit triggers the contact switch assembly to disconnect only when a first type of fault occurs in the power line, and the protection unit outputs a first control signal to the target switching device only when a second type of fault occurs in the power line. The first control signal is configured to control the target switching device to open, and the target switching device is configured to disconnect the power line.

2. The circuit breaker as described in claim 1, characterized in that, The current value when the power line experiences a first-type fault is greater than the current value when the power line experiences a second-type fault.

3. The circuit breaker as described in claim 2, characterized in that, The first type of fault includes short-circuit faults; The second type of fault includes overload faults and / or stall faults.

4. The circuit breaker as described in claim 1, characterized in that, The protection unit includes a current detector and a control circuit. The current detector is coupled to the power line, and the current detector is configured to detect the magnitude of the current in the power line. The control circuit is electrically connected to the current detector, and the control circuit is configured to output the control signal according to the magnitude of the current in the power line.

5. The circuit breaker as described in claim 4, characterized in that, The circuit breaker has a first output terminal and a second output terminal, the first output terminal and the second output terminal being configured to be connected to the target switching device, and the control circuit includes a control chip and a first switch; The control chip is electrically connected to the current detector, and the control chip is configured to output an enable signal according to the magnitude of the current in the power line; The first switch is electrically connected to the first output terminal, and the first switch is also electrically connected to the second output terminal; The enable signal is used to control the first switch. When a second type of fault occurs in the power line, the first switch disconnects the path between the first output terminal and the second output terminal.

6. The circuit breaker as described in claim 5, characterized in that, The circuit breaker also has a third output terminal, and the first output terminal and the third output terminal are configured to connect to a fault indicator light. The first switch is also electrically connected to the third output terminal. When a second type of fault occurs in the power line, the first switch opens the path between the first output terminal and the third output terminal.

7. The circuit breaker as claimed in claim 1, characterized in that, The protection unit has an automatic reset mode; When the protection unit is in the automatic reset mode, the protection unit outputs the second control signal after a preset time interval after outputting the first control signal; The second control signal is configured to control the target switch device to close.

8. The circuit breaker as claimed in claim 7, characterized in that, The protection unit also has a manual reset mode; When the protection unit is in the manual reset mode, the protection unit outputs a second control signal after manual power-off and restart; The second control signal is configured to control the target switching device to close.

9. The circuit breaker as claimed in claim 8, characterized in that, The circuit breaker has a first auxiliary power terminal and a second auxiliary power terminal; The first auxiliary power terminal and the second auxiliary power terminal are electrically connected to the protection unit, and the first auxiliary power terminal and the second auxiliary power terminal are electrically connected to the target auxiliary power supply.

10. The circuit breaker as claimed in claim 8, characterized in that, The circuit breaker includes a rotary switch, which is electrically connected to the protection unit. When the rotary switch is turned to the first position, the protection unit switches to the automatic reset mode; When the rotary switch is turned to the second position, the protection unit switches to the manual reset mode.

11. The circuit breaker as claimed in claim 10, characterized in that, The first gear position includes multiple first sub-gear positions. When the rotary switch is rotated to different first sub-gear positions, the current in the power line is not equal when the protection unit outputs the first control signal; and / or The second gear position includes multiple second sub-gear positions. When the rotary switch is rotated to different second sub-gear positions, the current in the power line is not equal when the protection unit outputs the first control signal.

12. The circuit breaker according to any one of claims 1 to 11, characterized in that, The contact switch assembly includes a contact switch and an operating mechanism; The contact switch is configured to control the on / off state of the power line, the operating mechanism is drivenly connected to the contact switch, and the operating mechanism is drivenly connected to the tripping unit; When a first type of fault occurs in the power line, the tripping unit activates the operating mechanism, causing the operating mechanism to activate the contact switch to disconnect the power line.

13. An electric power system, characterized in that, include: The circuit breaker and the target switching device as described in any one of claims 1 to 12; The circuit breaker disconnects only when a first-type fault occurs in the power system, and the target switching device disconnects only when a second-type fault occurs in the power system.

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