A control device for a circuit breaker and a control method for a circuit breaker

Abstract

The present invention discloses a control device for a circuit breaker and a control method for the circuit breaker, comprising a bus voltage detection circuit detecting a power grid state to generate a power grid bus detection result; a memory acquiring a storage action command basis, and updating a power grid bus flag bit according to the power grid bus detection result; a control circuit acquiring a circuit breaker control command and an ambient temperature, and generating an ambient state judgment result according to a preset temperature threshold; a circuit breaker action command is generated according to the circuit breaker control command, the power grid bus detection result, the power grid bus flag bit, and the ambient state judgment result; a drive circuit controls the movement of a drive motor according to the circuit breaker action command and the action command basis to control the circuit breaker switch state. The present invention generates circuit breaker action commands of different environmental states according to the power grid bus flag bit, the circuit breaker control command, and the action command basis to control the circuit breaker switch state, thereby improving the environmental adaptability and reliability of the circuit breaker.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage electrical appliances, and in particular to a circuit breaker control device and a circuit breaker control method. Background Art

[0002] With the advancement of the Internet of Everything and the ubiquitous power Internet of Things, various application scenarios have emerged. The functions of traditional low-voltage circuit breakers can no longer meet the needs. The demand for intelligent circuit breakers with voltage, current, power and other data collection, self-detection, early warning, communication, and remote automatic opening and closing functions is becoming increasingly clear. However, as the product functions increase, there are also higher requirements for product reliability, stability, high and low temperature adaptability, capacitor compatibility, etc. At the same time, due to the large latitude span between the north and south of China, the regional temperature difference is obvious, and the temperature difference between day and night alternates rapidly. In the far north, The temperature in the region can reach -40 degrees Celsius or even lower at night, while the reclosing circuit breakers in the prior art mostly adopt electronic operating mechanisms and use medical, beauty, car model, and aircraft model motors, which can only be used in environments above -20 degrees Celsius. Below -20 degrees Celsius, a fog film is easily formed between the rotor metal brush poles and the stator carbon brushes due to high humidity, low temperature, dusty air, etc., causing their conductive performance to drop significantly, especially when the environment is below -30 degrees Celsius and remains stationary for a long time, the fog film is in a frozen state, and the start-up power supply command causes it to fail to start normally. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect of poor environmental adaptability of the circuit breaker in the prior art, which leads to poor working reliability, thereby providing a control device and a control method for the circuit breaker.

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

[0005] In a first aspect, an embodiment of the present invention provides a control device for a circuit breaker, comprising: a bus voltage detection circuit, a memory, a control circuit, a drive circuit and a drive motor, wherein the bus voltage detection circuit is connected to a power grid, and is used to detect whether the power grid is out of power or restored, and to generate a power grid bus detection result; the memory is used to obtain and store the opening and closing state of the circuit breaker switch and the stop position of the circuit breaker switch, and to update the power grid bus flag according to the power grid bus detection result; the control circuit is used to obtain a circuit breaker control command; obtain an ambient temperature, and generate an ambient state judgment result according to a preset temperature threshold; generate a corresponding circuit breaker action command according to the circuit breaker control command, the power grid bus detection result, the power grid bus flag and the ambient state judgment result; the drive circuit is connected to the control circuit and the drive motor, and is used to control the movement state of the drive motor according to the circuit breaker action command, the opening and closing state of the circuit breaker switch and the stop position of the circuit breaker switch, so as to control the switch state of the circuit breaker.

[0006] In one embodiment, the control device of the circuit breaker further includes: a power supply circuit for providing electric energy to the bus voltage detection circuit, the memory, the control circuit, the drive circuit and the drive motor.

[0007] In one embodiment, the control circuit includes: a single chip microcomputer with a temperature indicator; or a single chip microcomputer with an analog-to-digital conversion interface and a thermistor.

[0008] In a second aspect, an embodiment of the present invention provides a method for controlling a circuit breaker, including: obtaining a power grid bus flag position, a circuit breaker switch opening and closing state, and a circuit breaker switch stop position; obtaining an ambient temperature, and generating an ambient state judgment result according to a preset temperature threshold; judging whether a control device has received a circuit breaker control command, and generating a control device working state result; controlling the circuit breaker switch state according to the power grid bus flag position, the circuit breaker switch opening and closing state, the circuit breaker switch stop position, the ambient state, the circuit breaker control command, and the control device working state result.

[0009] In one embodiment, the control method of the circuit breaker also includes: when the grid bus flag is the first grid bus flag, the environmental state is low temperature and the control device receives the circuit breaker control command, detecting whether the grid bus is powered on and generating a grid bus detection result; when the grid bus flag is the second grid bus flag, the environmental state is low temperature, and the control device receives the circuit breaker control command, executing the first low temperature action command; when the grid bus is not powered on, executing the first low temperature action command; when the grid bus is powered on, executing the second low temperature action command.

[0010] In one embodiment, the circuit breaker control method further includes: updating a bus power failure flag according to a power grid bus detection result.

[0011] In one embodiment, the control method of the circuit breaker also includes: when the grid bus flag is the first grid bus flag, the environmental state is normal temperature, and a circuit breaker control command is received, the normal temperature action command is executed; when the grid bus flag is the second grid bus flag, the environmental state is normal temperature, and the control device receives the circuit breaker control command, the normal temperature action command is executed.

[0012] In one embodiment, the process of executing the normal temperature action command includes: filtering the normal temperature action command to determine whether the filtered normal temperature action command is valid; when the filtered normal temperature action command is valid, setting the signal valid flag; when the filtered normal temperature action command is invalid, clearing the signal valid flag; determining whether the current working mode is the automatic mode; when the current working mode is the automatic mode, controlling the circuit breaker switch state by controlling the rotation state of the drive motor according to the circuit breaker control command.

[0013] In one embodiment, the process of executing the first low-temperature action command includes: obtaining the opening and closing state of the circuit breaker switch and the stop position of the circuit breaker switch; controlling the circuit breaker switch state by controlling the rotation state of the drive motor according to the circuit breaker control command; and executing the second low-temperature action command to control the circuit breaker not to operate.

[0014] In one embodiment, the process of controlling the switch state of a circuit breaker by controlling the rotation state of a driving motor according to a circuit breaker control command includes: identifying whether the circuit breaker control command is a circuit breaker closing command, a circuit breaker opening command, or a circuit breaker tripping command; when the circuit breaker control command is a circuit breaker closing command, obtaining the current circuit breaker switch opening and closing state, and judging whether the current circuit breaker switch opening and closing state is the circuit breaker opening state; when the current circuit breaker switch opening and closing state is the circuit breaker opening state, controlling the driving motor to rotate forward, and during the rotation of the driving motor, obtaining the circuit breaker switch position in real time, and judging whether the circuit breaker switch reaches the closing position; when the circuit breaker switch reaches the closing position, controlling the driving motor to rotate forward for a first preset time, controlling the driving motor to brake for a second preset time, and then controlling the driving motor to reverse, obtaining the circuit breaker switch position in real time, and judging whether the circuit breaker switch reaches the reset position; when the circuit breaker switch reaches the reset position, controlling the driving motor to brake for a third preset time, and then controlling the circuit breaker to enter a low power consumption state.

[0015] In one embodiment, the process of controlling the switch state of the circuit breaker by controlling the rotation state of the driving motor according to the circuit breaker control command also includes: when the circuit breaker control command is a circuit breaker closing command, and the circuit breaker switch opening and closing state is the circuit breaker closing state, after controlling the circuit breaker not to operate for a fourth preset time, controlling the circuit breaker to enter a low power consumption state.

[0016] In one embodiment, the process of controlling the switch state of the circuit breaker by controlling the rotation state of the driving motor according to the circuit breaker control command further includes: when the circuit breaker control command is a circuit breaker trip command, and the circuit breaker switch opening and closing state is the circuit breaker opening state, judging whether the circuit breaker switch stay position is in a closing position that is not allowed, or a reset position; when the circuit breaker switch stay position is in a closing position that is not allowed, controlling the circuit breaker to not operate for a fourth preset time, and then controlling the circuit breaker to enter a low power consumption state; when the circuit breaker switch stay position is in the reset position, controlling the driving motor to reverse to control the circuit breaker switch to stay in a closing position that is not allowed; when the circuit breaker switch opening and closing state is the circuit breaker closing state, controlling the driving motor to reverse to control the circuit breaker switch to stay in a closing position that is not allowed.

[0017] In one embodiment, the process of executing the normal temperature action command also includes: when the current working mode is the manual mode and the circuit breaker control command is the circuit breaker closing command, judging whether the circuit breaker opening and closing state is the circuit breaker opening state, and judging whether the circuit breaker switch stay position is in the non-closing position; when the circuit breaker opening and closing state is the circuit breaker opening state, and the circuit breaker switch stay position is in the non-closing position, controlling the drive motor to rotate forward to control the circuit breaker switch to stay in the reset position, and then controlling the drive motor to brake for a third preset time, and then controlling the circuit breaker to enter a low power consumption state; when the circuit breaker opening and closing state is the circuit breaker closing state, controlling the drive motor to rotate reversely to control the circuit breaker switch to stay in the reset position, and then controlling the drive motor to brake for a third preset time, and then controlling the circuit breaker to enter a low power consumption state.

[0018] In one embodiment, the circuit breaker control method further includes: a first grid bus flag indicates that the grid bus is powered off when the circuit breaker executes the circuit breaker control command; a second grid bus flag indicates that the grid bus is not powered off when the circuit breaker executes the circuit breaker control command.

[0019] The technical solution of the present invention has the following advantages:

[0020] 1. The circuit breaker control device provided by the present invention detects whether the power grid bus is powered on again after a power outage through a bus voltage detection circuit, uses a control circuit to judge the environmental state, and generates circuit breaker action commands for different environmental states according to the power grid bus flag position, circuit breaker control command, circuit breaker switch opening and closing state and circuit breaker switch stop position to control the circuit breaker switch state, thereby improving the circuit breaker's adaptability and reliability to temperature environments, and reducing the volume of the circuit breaker and its control device.

[0021] 2. The control method of the circuit breaker provided by the present invention determines whether the environmental state is a low temperature environment or a normal temperature environment after the control device receives the circuit breaker control command, and generates a low temperature action instruction or a normal temperature action instruction according to the power grid bus flag, the circuit breaker control command, the circuit breaker switch opening and closing state and the circuit breaker switch stop position, so as to realize the reliable operation of the circuit breaker in a wide temperature range.

[0022] 3. The control method of the circuit breaker provided by the present invention sets an automatic working mode and a manual working mode, and sets a variety of methods for controlling the switch state of the circuit breaker for the circuit breaker opening control command, the circuit breaker closing control command and the circuit breaker tripping control command, thereby improving the adaptability and reliability of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A composition diagram of a specific example of a control device for a circuit breaker provided in an embodiment of the present invention;

[0025] Figure 2 A bus voltage detection circuit diagram and a control circuit diagram provided by an embodiment of the present invention;

[0026] Figure 3 A driving circuit diagram provided by an embodiment of the present invention;

[0027] Figure 4 A power supply circuit diagram provided for an embodiment of the present invention;

[0028] Figure 5 A flowchart of a specific example of a circuit breaker control method provided by an embodiment of the present invention;

[0029] Figure 6 A flow chart of generating a low temperature action instruction provided by an embodiment of the present invention;

[0030] Figure 7 A flowchart of a specific example of a flowchart of a process of executing a normal temperature action instruction provided by an embodiment of the present invention;

[0031] Figure 8 A flowchart of another specific example of the flowchart of the process of executing the normal temperature action instruction provided by the embodiment of the present invention;

[0032] Fig. 9 A flowchart of another specific example of a process for executing an action instruction provided by an embodiment of the present invention;

[0033] Fig.10 A flowchart of another specific example of a process for executing a closing action instruction in an automatic mode provided by an embodiment of the present invention;

[0034] Fig.11 A flow chart of a process for executing a trip command provided by an embodiment of the present invention;

[0035] Fig.12 A flowchart of a process for executing a closing action instruction in manual mode provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] Example 1

[0041] The embodiment of the present invention provides a circuit breaker control device, which is applied to situations where circuit breakers working in different temperature environments need to be controlled, such as Figure 1 As shown, including:

[0042] The bus voltage detection circuit 1 is connected to the power grid and is used to detect whether the power grid is out of power or restored to power, and to generate a power grid bus detection result.

[0043] When the circuit breaker works under abnormal ambient temperature and receives the circuit breaker control command, the power grid bus may experience power outage, or power back on after power outage. Figure 2 As shown, the embodiment of the present invention is provided with a bus voltage detection circuit 1 connected to a power grid, which detects the power grid bus voltage and controls the circuit breaker switch state according to different action logics to improve the working reliability of the circuit breaker under abnormal ambient temperature.

[0044] It should be noted that the embodiments of the present invention are mainly aimed at circuit breakers operating in low temperature and normal temperature environments, so the action logics that can be used include normal temperature action logic and low temperature action logic.

[0045] Memory 2 is used to obtain and store the opening and closing states of the circuit breaker switch and the stop position of the circuit breaker switch, and update the grid bus flag according to the grid bus detection result.

[0046] When the circuit breaker receives the circuit breaker control command, the power grid bus may be out of power or not. Therefore, in order to facilitate the judgment of the power grid bus status during the circuit breaker execution of the circuit breaker control command, the embodiment of the present invention sets a memory 2, which stores the power grid bus flag bit for real-time storage of the power grid bus status. In the embodiment of the present invention, the memory 2 can be an electrically erasable read-only memory or an on-chip integrated erasable Flash memory, etc.

[0047] In order to further improve the working reliability of the circuit breaker, the embodiment of the present invention provides a variety of circuit breaker action commands, such as: circuit breaker opening / closing command, circuit breaker tripping command, etc., and any circuit breaker action command corresponds to a different circuit breaker switch position. Therefore, in order to prevent the circuit breaker from malfunctioning, the memory 2 is also used to obtain and store the circuit breaker switch opening and closing state and the circuit breaker switch stop position. Different circuit breaker action commands are adopted for different circuit breaker switch opening and closing states, circuit breaker switch stop positions and circuit breaker action commands.

[0048] The grid bus flag indicates different grid bus conditions at different ambient temperatures when the circuit breaker receives the circuit breaker control command, which can be regarded as the first grid bus state, and the grid bus detection result is the current grid bus detection condition, which can be regarded as the second grid bus state. In abnormal ambient temperature, the circuit breaker may fail or the grid bus may suddenly lose power (first grid bus state). At this time, the grid bus flag will be updated according to the first grid bus state. In the subsequent working environment of the circuit breaker, the power-off grid bus may be re-powered or continue to be out of power (second grid bus state). At this time, the control device will control the circuit breaker switch state according to the first grid bus state (grid bus flag) and the second grid bus state (grid bus detection result). At the same time, according to the second grid bus state (grid bus detection result), the embodiment of the present invention sets the first grid bus state (grid bus flag) to the first grid bus flag or the second grid bus flag, so that the control device controls the circuit breaker switch state according to the subsequent circuit breaker control command and the grid bus flag.

[0049] The control circuit 3 is used to obtain the circuit breaker control command; obtain the ambient temperature, and generate the environmental state judgment result according to the preset temperature threshold; generate the corresponding circuit breaker action command according to the circuit breaker control command, the power grid bus detection result, the power grid bus flag, the circuit breaker switch opening and closing state, the circuit breaker switch stop position and the environmental state judgment result.

[0050] The control circuit 3 includes a single chip microcomputer with a temperature indicator, or a control circuit 3 composed of a single chip microcomputer with an analog-to-digital conversion interface and a thermistor. Figure 2 The control circuit 3 is a single-chip microcomputer with a temperature indicator. This circuit does not need an external thermistor or other temperature measuring element, and can directly measure the ambient temperature. The thermistor of the control circuit 3 composed of a single-chip microcomputer with an analog-to-digital conversion interface and a thermistor is connected to a voltage divider circuit, and the voltage divider circuit is connected to a power supply circuit 6. The voltage divider circuit can be composed of a resistor connected in series or in parallel with the thermistor. This is only an example and is not limited to this. The embodiment of the present invention is mainly aimed at circuit breakers working in low temperature or normal temperature environments, so the thermistor uses a negative temperature coefficient thermistor (Negative Temperature Coefficient Thermistor, referred to as NTC thermistor).

[0051] When the control circuit 3 receives the circuit breaker control command, due to the abnormal ambient temperature, the power grid bus may have a power outage, no power outage, power on after a power outage, or no power on after a power outage. Therefore, the control circuit 3 must not only determine whether the ambient temperature is low or normal, but also generate corresponding circuit breaker action commands based on the power grid bus detection results, the power grid bus flag, the circuit breaker control command, etc., to improve the reliability of the circuit breaker. The power outage and no power outage phenomenon can be known from the power grid bus flag, and the power on after a power outage and no power on after a power outage phenomenon can be known from the power grid bus flag and the power grid bus detection results.

[0052] The drive circuit 4 is connected to the control circuit 3 and the drive motor 5, and is used to control the movement state of the drive motor 5 according to the circuit breaker action command, the circuit breaker switch opening and closing state and the circuit breaker switch stop position, so as to control the switch state of the circuit breaker.

[0053] like Figure 3 As shown, the drive circuit 4 receives the circuit breaker action command sent by the control circuit 3 through the pin 1, and controls the drive motor 5 to rotate forward, reverse, brake, etc. according to the circuit breaker action command, the circuit breaker switch opening and closing state and the circuit breaker switch stop position, so as to control the drive motor 5 to rotate to reach the corresponding closing and opening angles, so as to control the circuit breaker switch to reach the optimal position.

[0054] Figure 4The circuit shown is a power supply circuit 6, which is used to provide power to the bus voltage detection circuit 1, the memory 2, the control circuit 3, the drive circuit 4 and the drive motor 5.

[0055] The control device of the circuit breaker provided in the embodiment of the present invention detects whether the power grid bus is powered on again after a power outage through a bus voltage detection circuit, uses the control circuit 3 to judge the environmental state, and generates circuit breaker action commands for different environmental states according to the power grid bus flag position, the circuit breaker control command, the circuit breaker switch opening and closing state and the circuit breaker switch stop position to control the circuit breaker switch state, thereby improving the circuit breaker's adaptability and reliability to the temperature environment, and reducing the volume of the circuit breaker and its control device.

[0056] Example 2

[0057] An embodiment of the present invention provides a control method for a circuit breaker, such as Figure 5 As shown, including:

[0058] Step S11: Obtain the power grid bus flag position, the circuit breaker switch opening and closing status, and the circuit breaker switch stop position.

[0059] The grid bus flag indicates different grid bus conditions at different ambient temperatures when the circuit breaker receives a circuit breaker control command, which can be regarded as the first grid bus state, and the grid bus detection result is the current grid bus detection condition, which can be regarded as the second grid bus state. In abnormal ambient temperature, the circuit breaker may fail or the grid bus may suddenly lose power (first grid bus state). At this time, the grid bus flag will be updated according to the first grid bus state. In the subsequent working environment of the circuit breaker, the power-off grid bus may be re-energized or continue to be out of power (second grid bus state). At this time, the control device will control the circuit breaker switch state according to the first grid bus state (grid bus flag) and the second grid bus state (grid bus detection result).

[0060] When the circuit breaker operates in an abnormal ambient temperature, when it receives a circuit breaker control command, it may cause a power outage or no power outage in the power grid bus. At this time, the power grid bus flag will be set to the first bus flag or the second bus flag according to the power grid bus situation, so as to integrate the subsequent power grid bus detection results and generate circuit breaker action instructions such as power outage and power supply, power outage but no power supply, and no power outage.

[0061] The circuit breaker switch opening and closing state and the circuit breaker switch stop position are mainly aimed at different circuit breaker control commands (including opening / closing, tripping commands, etc.), controlling the movement state of the drive motor to control the circuit breaker switch state.

[0062] Step S12: Acquire the ambient temperature and generate an ambient state judgment result according to a preset temperature threshold.

[0063] The ambient temperature is compared with the preset temperature threshold. When the ambient temperature is higher than or equal to the preset temperature threshold, the ambient state is determined to be a normal temperature environment. When the ambient temperature is lower than the preset temperature threshold, the ambient state is determined to be a low temperature environment. The preset temperature threshold needs to be set according to the temperature range in which different circuit breakers can work normally. This preset low temperature threshold is a preset value that is comprehensively considered based on the motor load characteristics and changes in mechanical structure force, and is not limited here.

[0064] Step S13: Determine whether the control device has received the circuit breaker control command, and generate a working status result of the control device.

[0065] Step S14: Control the circuit breaker switch state according to the bus power failure flag, the circuit breaker switch opening and closing state, the circuit breaker switch stop position, the environmental state, the circuit breaker control command and the control device working state result.

[0066] Determine whether the control device has received the circuit breaker control command and generate the working status result of the control device. When the control device receives the circuit breaker control command, it is necessary to determine whether the grid bus flag is the first grid bus flag or the second grid bus flag (that is, when the control device is executing the circuit breaker control command, the grid bus suddenly loses power or does not lose power, and the state of the grid bus corresponds to different grid bus flags), and then select different action logics according to different grid bus flags and environmental states. The action logic includes different circuit breaker switch opening and closing states, circuit breaker switch stop positions, and circuit breaker control commands to control the circuit breaker switch state. When the control device does not receive the circuit breaker control command, it continues to scan to determine whether the control device has received the circuit breaker control command so as to receive the circuit breaker control command in time.

[0067] In a specific embodiment, if Figure 6 As shown, the control method of the circuit breaker also includes:

[0068] Step S21: When the grid bus flag is the first grid bus flag, the environmental state is low temperature and the control device receives a circuit breaker control command, detect whether the grid bus is powered off and generate a grid bus detection result; when the grid bus flag is the second grid bus flag, the environmental state is low temperature, and the control device receives a circuit breaker control command, execute the first low temperature action command.

[0069] Step S22: When the power grid bus is not out of power, execute the first low-temperature action command; when the power grid bus is out of power, execute the second low-temperature action command.

[0070] The first grid bus flag indicates that when the circuit breaker executes the circuit breaker control command, the grid bus is powered off (first grid bus state); the second grid bus flag indicates that when the circuit breaker executes the circuit breaker control command, the grid bus is not powered off (first grid bus state).

[0071] When the control device is executing the circuit breaker control command, the power grid bus suddenly loses power or does not lose power, and the state of the power grid bus corresponds to different power grid bus flags. When the power grid bus suddenly loses power, it is necessary to detect whether the power grid bus is powered on again, and then execute different circuit breaker action commands according to different environmental conditions.

[0072] Figure 7 In the process, firstly, the control circuit (single-chip microcomputer) is powered on and initialized, and at the same time, the bus power failure flag is read, the ambient temperature is collected, the circuit breaker opening and closing instructions are identified, and the grid bus voltage status is detected. According to the above detection, collection, identification and other results, it is divided into the following situations: ① In a low-temperature environment, the grid bus is powered off and then powered on, and the first low-temperature action command is executed (that is, the unfinished action is continued). ② In a low-temperature environment, the grid bus is powered off and then powered on, and the second low-temperature action command is executed (that is, the unfinished action is not executed). ③ In a normal temperature environment, the grid bus is powered off, and the normal temperature action command is executed (that is, normal opening and closing). ④ In a normal temperature environment, the grid bus is not powered off, and the normal temperature action command is executed (that is, normal opening and closing). ⑤ In a normal temperature environment, the grid bus is not powered off, and the first low-temperature action command is executed (that is, the unfinished action is continued).

[0073] In a specific embodiment, the circuit breaker control method further includes:

[0074] According to the power grid bus detection result, the power grid bus flag is updated.

[0075] The embodiment of the present invention sets the first grid bus state (grid bus flag) to the first grid bus flag or the second grid bus flag according to the second grid bus state (grid bus detection result), so that the control device controls the circuit breaker switching state according to the subsequent circuit breaker control command and the grid bus flag.

[0076] In a specific embodiment, the circuit breaker control method further includes:

[0077] When the grid bus flag is the first grid bus flag, the environmental state is normal temperature, and a circuit breaker control command is received, the normal temperature action command is executed; when the grid bus flag is the second grid bus flag, the environmental state is normal temperature, and the control device receives a circuit breaker control command, the normal temperature action command is executed.

[0078] In a specific embodiment, if Figure 8 As shown in the figure, the process of executing the normal temperature action command includes:

[0079] Step S31: filtering the normal temperature action command to determine whether the filtered normal temperature action command is valid.

[0080] Step S32: When the filtered normal temperature action command is valid, the signal valid flag is set; when the filtered normal temperature action command is invalid, the signal valid flag is cleared.

[0081] In order to prevent interference from the working environment of the circuit breaker, when the control device issues a normal temperature action command, it is necessary to filter the normal temperature action command and determine whether the filtered normal temperature action command is valid. At the same time, when the action command is valid, the signal valid flag is set, and when the action command is invalid, the signal valid flag is cleared to prevent the control device from misjudging the environmental state as a normal temperature environment in a low temperature environment, thereby avoiding damage to the hardware.

[0082] Step S33: Determine whether the current working mode is the automatic mode.

[0083] In the embodiment of the present invention, the control device is provided with two working modules, namely, an automatic module and a manual mode. Different action logics and mechanisms are selected for different working modes so as to improve the environmental adaptability of the circuit breaker.

[0084] Step S34: When the current working mode is the automatic mode, the circuit breaker switch state is controlled by controlling the rotation state of the drive motor according to the circuit breaker control command.

[0085] In the embodiment of the present invention, for different circuit breaker control commands (including: circuit breaker opening command, circuit breaker closing command and circuit breaker tripping command, etc.), the drive motor is controlled to rotate forward, reverse, brake or coast, etc., to control the circuit breaker switch to stay in different positions (including: closing position, opening position, reset position, non-closing position, etc.).

[0086] In a specific embodiment, if Fig. 9 As shown, the process of executing the first low temperature action command includes:

[0087] S41: Acquire the opening and closing status of the circuit breaker switch and the stop position of the circuit breaker switch.

[0088] S42: Controlling the switch state of the circuit breaker by controlling the rotation state of the drive motor according to the circuit breaker control command.

[0089] The first low-temperature action command is an action command issued by the control device when the first power grid bus state is power outage and the second power grid bus state is power on again, that is, when the circuit breaker executes the circuit breaker control command, the power grid bus suddenly loses power and then powers on again, then the circuit breaker control command that has not been completed by the circuit breaker will continue to be executed. For example: when the circuit breaker executes the circuit breaker closing command, the power grid bus suddenly loses power, the circuit breaker switch does not stay in the closing position, and after a period of time, the power grid bus is powered on again, at this time the control device will determine whether the circuit breaker closing command is received, and then determine the environmental state and detect whether the power grid bus is powered on again. When the environmental state is detected to be a low-temperature state and the power grid bus is powered on again, the unfinished circuit breaker closing command will continue to be executed, that is, the first low-temperature action command; when the environmental state is detected to be a low-temperature state and the power grid bus has not been powered on again, the circuit breaker is controlled not to act, that is, the second low-temperature action command.

[0090] In a specific embodiment, if Fig.10 As shown, the process of controlling the switch state of the circuit breaker by controlling the rotation state of the driving motor according to the circuit breaker control command includes:

[0091] Step S51: Identify whether the circuit breaker control command is a circuit breaker closing command, a circuit breaker opening command, or a circuit breaker tripping command.

[0092] Step S52: when the circuit breaker control command is a circuit breaker closing command, the current circuit breaker switch opening and closing state is obtained, and it is determined whether the current circuit breaker switch opening and closing state is the circuit breaker opening state.

[0093] Step S53: When the current circuit breaker switch opening and closing state is the circuit breaker opening state, the drive motor is controlled to rotate forward, and during the rotation of the drive motor, the circuit breaker switch position is obtained in real time, and it is determined whether the circuit breaker switch reaches the closing position.

[0094] In the embodiment of the present invention, the circuit breaker control command is divided into a circuit breaker closing command, a circuit breaker opening command, or a circuit breaker tripping command. However, when the control device receives the circuit breaker control command, the circuit breaker switch state does not necessarily stay at the corresponding closing position, opening position, and non-closing position. Therefore, it is necessary to control the drive motor to rotate forward, reverse, or brake according to the circuit breaker control command, the current circuit breaker switch closing and opening state, and the circuit breaker switch stop position. The circuit breaker switch can stay at the accurate position after the drive motor reaches the accurate closing and opening angles.

[0095] Step S54: When the circuit breaker switch reaches the closing position, the drive motor is controlled to rotate forward for a first preset time, the drive motor is controlled to brake for a second preset time, and then the drive motor is controlled to reverse, the circuit breaker switch position is obtained in real time, and it is determined whether the circuit breaker switch reaches the reset position.

[0096] Step S55: When the circuit breaker switch reaches the reset position, the driving motor is controlled to brake for a third preset time, and then the circuit breaker is controlled to enter a low power consumption state.

[0097] When the circuit breaker control command is a circuit breaker closing command and the circuit breaker switch is in the circuit breaker opening state, the drive motor is controlled to rotate forward. During the forward rotation of the drive motor, the circuit breaker switch position is scanned in real time to obtain the circuit breaker switch position. When the circuit breaker switch stays in the circuit breaker closing position, the drive motor is controlled to rotate forward for a first preset time to enhance the contact reliability of the circuit breaker switch structure. Then, the drive motor is controlled to brake for a second preset time to release the energy stored in the drive motor. Then, the drive motor is controlled to reverse, the circuit breaker switch position is obtained in real time, and it is determined whether the circuit breaker switch reaches the reset position. When the circuit breaker switch reaches the reset position, the drive motor is controlled to brake urgently for a third preset time, and then the circuit breaker enters a low power consumption state.

[0098] When the circuit breaker control command is a circuit breaker closing command, and the circuit breaker switch opening and closing state is the circuit breaker closing state (ie, the circuit breaker switch stays in the closing position), after the circuit breaker is controlled not to operate for a fourth preset time, the circuit breaker is controlled to enter a low power consumption state.

[0099] Similarly, when the circuit breaker control command is a circuit breaker opening command and the circuit breaker switch is in the circuit breaker closing state, the drive motor is controlled to reverse. During the reversal of the drive motor, the circuit breaker switch position is scanned in real time to obtain the circuit breaker switch position. When the circuit breaker switch stays in the circuit breaker opening position, the drive motor is controlled to reverse for a first preset time to enhance the contact reliability of the circuit breaker switch structure. Then, the drive motor is controlled to brake for a second preset time to release the energy stored in the drive motor. Then, the drive motor is controlled to rotate forward, the circuit breaker switch position is obtained in real time, and it is determined whether the circuit breaker switch reaches the reset position. When the circuit breaker switch reaches the reset position, the drive motor is controlled to brake urgently for a third preset time, and then the circuit breaker enters a low power consumption state.

[0100] When the circuit breaker control command is a circuit breaker opening command, and the circuit breaker switch opening and closing state is the circuit breaker opening state (ie, the circuit breaker switch stays in the closing position), after the circuit breaker is controlled not to operate for a fourth preset time, the circuit breaker is controlled to enter a low power consumption state.

[0101] In a specific embodiment, if Fig.11 As shown, the process of controlling the switch state of the circuit breaker by controlling the rotation state of the drive motor according to the circuit breaker control command also includes:

[0102] Step S61: when the circuit breaker control command is a circuit breaker trip command, and the circuit breaker switch opening and closing state is the circuit breaker opening state, it is determined whether the circuit breaker switch stay position is in a closing disallowed position or a reset position.

[0103] Step S62: When the circuit breaker switch stays at the position where closing is not allowed, the circuit breaker is controlled not to operate for a fourth preset time, and then the circuit breaker is controlled to enter a low power consumption state; when the circuit breaker switch stays at the reset position, the driving motor is controlled to reverse to control the circuit breaker switch to stay at the position where closing is not allowed.

[0104] When the circuit breaker control command is a circuit breaker trip command, the circuit breaker switch opening and closing state is the circuit breaker opening state, and the circuit breaker switch stay position is at a position that does not allow closing (i.e., a trip position), the circuit breaker is controlled not to operate for a fourth preset time, and the circuit breaker enters a low power consumption state; and when the circuit breaker control command is a circuit breaker trip command, the circuit breaker switch opening and closing state is the circuit breaker opening state, and the circuit breaker switch stay position is at a reset position, the drive motor is controlled to reverse, and the circuit breaker switch stay position is scanned in real time to obtain the circuit breaker switch stay position, until the circuit breaker switch position stays at a position that does not allow closing, and the drive motor stops moving.

[0105] Step S63: When the circuit breaker switch opening and closing state is the circuit breaker closing state, the circuit breaker switch is controlled to stay in the non-closing position by controlling the driving motor to reverse.

[0106] Similarly, when the circuit breaker control command is a circuit breaker trip command and the circuit breaker switch opening and closing state is the circuit breaker closing state (i.e., the closing position), the drive motor is controlled to reverse, and at the same time, the circuit breaker switch stop position is continuously scanned to obtain the circuit breaker switch stop position during the reversal process of the drive motor until the circuit breaker switch position stays at the position that does not allow closing, and the drive motor stops moving.

[0107] In a specific embodiment, if Fig.12 As shown, the process of executing the normal temperature action command also includes:

[0108] Step S71: when the current working mode is the manual mode and the circuit breaker control command is a circuit breaker closing command, determine whether the circuit breaker opening and closing state is the circuit breaker opening state, and determine whether the circuit breaker switch stay position is in a position that does not allow closing.

[0109] Step S72: When the circuit breaker opening and closing state is the circuit breaker opening state, and the circuit breaker switch stays in the position where closing is not allowed, the circuit breaker switch is controlled to stay in the reset position by controlling the drive motor to rotate forward, and then the drive motor is controlled to brake for a third preset time, and then the circuit breaker is controlled to enter a low power consumption state.

[0110] When the working state of the control device is manual mode, the circuit breaker control command is a closing command, the circuit breaker opening and closing state is the circuit breaker opening state (the circuit breaker switch stays in the opening position), the drive motor is controlled to rotate forward, and while the drive motor rotates forward, the circuit breaker switch stay position is continuously scanned and obtained until the circuit breaker switch stays in the reset position, and then the drive motor is controlled to emergency brake for a third preset time to control the circuit breaker to enter a low power consumption state.

[0111] Step S73: When the circuit breaker opening and closing state is the circuit breaker closing state, the circuit breaker switch is controlled to stay in the reset position by controlling the driving motor to reverse, and then the driving motor is controlled to brake for a third preset time, and then the circuit breaker is controlled to enter a low power consumption state.

[0112] When the working state of the control device is manual mode, the circuit breaker control command is a closing command, the circuit breaker opening and closing state is the circuit breaker closing state (the circuit breaker switch stays in the closing position), the drive motor is controlled to reverse, and while the drive motor is reversed, the circuit breaker switch stay position is continuously scanned to obtain until the circuit breaker switch stays in the reset position, and then the drive motor is controlled to emergency brake for a third preset time to control the circuit breaker to enter a low power consumption state.

[0113] In a specific embodiment, for a circuit breaker working in a low temperature environment, low temperature action compensation will be started. Specifically, when the control device receives a closing command and needs to close the circuit, the load of the driving motor increases at low temperatures, the mechanical structure force increases, the capacitor is reduced, and other factors cause the load capacity of the power supply circuit to decrease, the output voltage of the power supply circuit decreases, and the voltage obtained by the motor decreases, resulting in a decrease in the speed. If the driving time at normal temperature is used, the circuit breaker will not be able to reach the optimal position of the mechanical structure or will fail to close, open, or trip directly. Therefore, in this case, the closing, opening, and tripping times will be compensated (the closing time includes: the forward rotation duration of the driving motor, the reverse rotation duration of the driving motor, and the braking duration of the driving motor, etc.) to ensure that it can also reach the optimal closing position of the mechanical structure.

[0114] The control method of the circuit breaker provided by the embodiment of the present invention determines whether the environmental state is a low temperature environment or a normal temperature environment after the control device receives the circuit breaker control command, and generates a low temperature action instruction or a normal temperature action instruction according to the power grid bus flag, the circuit breaker control command, the circuit breaker switch opening and closing state and the circuit breaker switch stop position, so as to realize the reliable operation of the circuit breaker in a wide temperature range; the automatic working mode and the manual working mode are set, and the circuit breaker is controlled to be in different states according to the circuit breaker opening control command, the circuit breaker closing control command and the circuit breaker tripping working command, thereby improving the adaptability and reliability of the circuit breaker.

[0115] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention.

Claims

1. A control device for a circuit breaker, It is characterized in that include: Bus voltage detection circuit, memory, control circuit, drive circuit, drive motor, power supply circuit, wherein: The bus voltage detection circuit is connected to the power grid to detect whether the power grid is out of power or restored, and to generate a power grid bus detection result; The memory is used to obtain and store the opening and closing status of the circuit breaker switch and the stop position of the circuit breaker switch, and update the power grid bus flag according to the power grid bus detection result; A control circuit is used to obtain a circuit breaker control command; obtain an ambient temperature, and generate an ambient state judgment result according to a preset temperature threshold; generate a corresponding circuit breaker action command according to the circuit breaker control command, the power grid bus detection result, the power grid bus flag bit and the ambient state judgment result; A drive circuit connected to the control circuit and the drive motor, used to control the movement state of the drive motor according to the circuit breaker action command, the opening and closing state of the circuit breaker switch and the circuit breaker switch stop position, so as to control the switch state of the circuit breaker; A power supply circuit, used to provide electric energy to the bus voltage detection circuit, memory, control circuit, drive circuit and drive motor; The control circuit includes: a single chip microcomputer with a temperature indicator; or a single chip microcomputer with an analog-to-digital conversion interface and a thermistor; When the grid bus flag is the first grid bus flag, the environment state is normal temperature, and a circuit breaker control command is received, the normal temperature action command is executed; when the grid bus flag is the second grid bus flag, the environment state is normal temperature, and the control device receives a circuit breaker control command, the normal temperature action command is executed; The process of executing the normal temperature action command includes: filtering the normal temperature action command to determine whether the filtered normal temperature action command is valid; when the filtered normal temperature action command is valid, setting a signal valid flag; when the filtered normal temperature action command is invalid, clearing the signal valid flag; determining whether the current working mode is the automatic mode; when the current working mode is the automatic mode, controlling the circuit breaker switch state by controlling the rotation state of the drive motor according to the circuit breaker control command.

2. A control method for a circuit breaker, It is characterized in that include: Obtain the power grid busbar flag position, circuit breaker switch opening and closing status, and circuit breaker switch stop position; Obtaining the ambient temperature and generating an ambient state judgment result according to a preset temperature threshold; Determine whether the control device has received the circuit breaker control command and generate a working status result of the control device; Control the circuit breaker switch status according to the power grid busbar flag position, circuit breaker switch opening and closing status, circuit breaker switch stop position, environmental status, circuit breaker control command and control device working status results; When the grid bus flag is the first grid bus flag, the environment state is normal temperature, and a circuit breaker control command is received, the normal temperature action command is executed; when the grid bus flag is the second grid bus flag, the environment state is normal temperature, and the control device receives a circuit breaker control command, the normal temperature action command is executed; The process of executing the normal temperature action command includes: filtering the normal temperature action command to determine whether the filtered normal temperature action command is valid; when the filtered normal temperature action command is valid, setting a signal valid flag; when the filtered normal temperature action command is invalid, clearing the signal valid flag; determining whether the current working mode is the automatic mode; when the current working mode is the automatic mode, controlling the circuit breaker switch state by controlling the rotation state of the drive motor according to the circuit breaker control command.

3. The circuit breaker control method according to claim 2, It is characterized in that When the grid bus flag is the first grid bus flag, the environmental state is low temperature and the control device receives a circuit breaker control command, it detects whether the grid bus is powered off and generates a grid bus detection result; when the grid bus flag is the second grid bus flag, the environmental state is low temperature, and the control device receives a circuit breaker control command, it executes a first low temperature action command; When the power grid bus is not out of power, the first low-temperature action command is executed; when the power grid bus is out of power, the second low-temperature action command is executed.

4. The circuit breaker control method according to claim 2, It is characterized in that Also includes: According to the power grid bus detection result, the power grid bus flag is updated.

5. The circuit breaker control method according to claim 3, It is characterized in that The process of executing the first low temperature action command includes: Obtain the opening and closing status of the circuit breaker switch and the stop position of the circuit breaker switch; Controlling the switch state of the circuit breaker by controlling the rotation state of the drive motor according to the circuit breaker control command; The executing the second low temperature action command is to control the circuit breaker not to act.

6. The circuit breaker control method according to claim 5, It is characterized in that The process of controlling the switch state of the circuit breaker by controlling the rotation state of the driving motor according to the circuit breaker control command includes: Identify that the circuit breaker control command is a circuit breaker closing command, a circuit breaker opening command, or a circuit breaker tripping command; When the circuit breaker control command is a circuit breaker closing command, the current circuit breaker switch opening and closing state is obtained, and it is determined whether the current circuit breaker switch opening and closing state is the circuit breaker opening state; When the current circuit breaker switch opening and closing state is the circuit breaker opening state, the drive motor is controlled to rotate forward, and during the rotation of the drive motor, the circuit breaker switch position is obtained in real time, and it is determined whether the circuit breaker switch reaches the closing position; When the circuit breaker switch reaches the closing position, the driving motor is controlled to rotate forward for a first preset time, the driving motor is controlled to brake for a second preset time, and then the driving motor is controlled to reverse, the circuit breaker switch position is obtained in real time, and it is determined whether the circuit breaker switch reaches the reset position; When the circuit breaker switch reaches the reset position, the driving motor is controlled to brake for a third preset time, and then the circuit breaker is controlled to enter a low power consumption state.

7. The circuit breaker control method according to claim 6, It is characterized in that The process of controlling the switch state of the circuit breaker by controlling the rotation state of the drive motor according to the circuit breaker control command also includes: When the circuit breaker control command is a circuit breaker closing command, and the circuit breaker switch opening and closing state is the circuit breaker closing state, after the circuit breaker is controlled to be inactive for a fourth preset time, the circuit breaker is controlled to enter a low power consumption state.

8. The circuit breaker control method according to claim 6, It is characterized in that The process of controlling the switch state of the circuit breaker by controlling the rotation state of the drive motor according to the circuit breaker control command also includes: When the circuit breaker control command is a circuit breaker trip command, and the circuit breaker switch opening and closing state is the circuit breaker opening state, determining whether the circuit breaker switch stay position is in a closing-not-allowed position, or a reset position; When the circuit breaker switch stays at the position where closing is not allowed, the circuit breaker is controlled to be inactive for a fourth preset time, and then the circuit breaker is controlled to enter a low power consumption state; when the circuit breaker switch stays at the reset position, the driving motor is controlled to reverse, so as to control the circuit breaker switch to stay at the position where closing is not allowed; When the circuit breaker switch is in the opening and closing state, the circuit breaker switch is controlled to stay in the non-closing position by controlling the driving motor to reverse.

9. The circuit breaker control method according to claim 2, It is characterized in that The process of executing the normal temperature action command also includes: When the current working mode is the manual mode and the circuit breaker control command is the circuit breaker closing command, it is determined whether the circuit breaker opening and closing state is the circuit breaker opening state, and whether the circuit breaker switch stop position is in the non-closing position; When the circuit breaker opening and closing state is the circuit breaker opening state, and the circuit breaker switch stays in the non-closing position, the circuit breaker switch is controlled to stay in the reset position by controlling the driving motor to rotate forward, and then the driving motor is controlled to brake for a third preset time, and then the circuit breaker is controlled to enter a low power consumption state; When the circuit breaker opening and closing state is the circuit breaker closing state, the circuit breaker switch is controlled to stay in the reset position by controlling the driving motor to reverse, and then the driving motor is controlled to brake for a third preset time, and then the circuit breaker is controlled to enter a low power consumption state.

10. The circuit breaker control method according to claim 3, It is characterized in that The first grid bus flag indicates that the grid bus is powered off when the circuit breaker executes the circuit breaker control command; the second grid bus flag indicates that the grid bus is not powered off when the circuit breaker executes the circuit breaker control command.

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