Intelligent trip unit and fault detection method

Abstract

The application provides an intelligent tripping device and a fault detection method, and belongs to the technical field of circuit breaker accessories. The intelligent tripping device detects the shielding light signal of the moving iron core in the tripping module when the photoelectric sensor stop lever moves through the photoelectric sensor, generates an electric pulse signal, and sends the electric pulse signal to the control unit. The vibration sensor detects the vibration signal of the moving iron core in the tripping module in real time, and sends the vibration signal to the control unit. The broken line detection circuit detects the sampling voltage of the sampling resistor in the electromagnetic coil driving unit in real time, and sends the sampling voltage to the control unit. The control unit determines and outputs the fault information of the tripping module according to the electric pulse signal, the vibration signal and the sampling voltage. The application can simultaneously meet the electrical fault detection and mechanical fault detection requirements of the tripping device, so as to improve the accuracy and reliability of the tripping device fault detection result.

Description

Technical Field

[0001] This application relates to the field of circuit breaker accessory technology, and more specifically, to an intelligent tripping device and a fault detection method. Background Technology

[0002] Trip units are commonly used in air circuit breakers or molded case circuit breakers as auxiliary components, providing protection against short circuits, overloads, leakage current, undervoltage, and overvoltage to ensure stable operation. Electromagnetic trip units are frequently used in circuit breaker applications, primarily consisting of an electromagnetic coil, moving and stationary iron cores, a spring, and a magnetic yoke. However, if the trip unit fails to operate when energized, it will directly cause a circuit breaker failure. Therefore, an efficient method for detecting trip unit faults is urgently needed to maintain the operational stability of circuit breakers.

[0003] In related technologies, an input voltage detection circuit, an electromagnetic coil continuity detection circuit, and a communication module are typically deployed in an intelligent trip unit. The intelligent trip unit detects the input voltage of the intelligent trip unit through the input voltage detection circuit, detects the continuity status of the electromagnetic coil through the electromagnetic coil continuity detection circuit, and then feeds back the detection results to the circuit breaker through the communication module so that the circuit breaker can take corresponding actions.

[0004] However, the relevant technologies only support input voltage detection and electromagnetic coil continuity detection, which cannot meet the needs of electrical and mechanical fault detection of the trip unit. Summary of the Invention

[0005] The purpose of this application is to provide an intelligent tripping device and a fault detection method that can simultaneously meet the electrical and mechanical fault detection requirements of the tripping device, thereby improving the accuracy and reliability of the fault detection results.

[0006] The embodiments of this application are implemented as follows:

[0007] A first aspect of this application provides an intelligent tripping device, which includes a tripping module, a photoelectric sensor, and a control module. The tripping module includes a photoelectric sensor stop, an electromagnetic coil, and a moving iron core. The control module includes a control unit, a vibration sensor, a wire breakage detection circuit, and an electromagnetic coil drive unit.

[0008] The electromagnetic coil is connected to the output terminal of the electromagnetic coil drive unit, the input terminal of the electromagnetic coil drive unit is connected to the control unit, and the sampling terminal of the electromagnetic coil drive unit is connected to the input terminal of the wire breakage detection circuit.

[0009] The output terminals of the wire breakage detection circuit, the photoelectric sensor, and the vibration sensor are all connected to the control unit.

[0010] The photoelectric sensor is used to detect the light signal blocked by the photoelectric sensor stop rod when it moves, generate an electrical pulse signal, and send the electrical pulse signal to the control unit.

[0011] The vibration sensor is used to detect the vibration signal of the moving iron core in the trip module in real time and send the vibration signal to the control unit;

[0012] The open circuit is used to detect the sampling voltage of the sampling resistor in the electromagnetic coil drive unit in real time and send the sampling voltage to the control unit.

[0013] The control unit determines and outputs fault information of the trip module based on electrical pulse signals, vibration signals, and sampled voltage.

[0014] One possible implementation is that the electromagnetic coil driving unit includes: a coil control circuit, which includes: an N-type metal-oxide-semiconductor transistor and a sampling resistor;

[0015] The gate of the N-type metal-oxide-semiconductor transistor is connected to the control unit, the drain of the N-type metal-oxide-semiconductor transistor is connected to the electromagnetic coil, the source of the N-type metal-oxide-semiconductor transistor is connected to one end of the sampling resistor, one end of the sampling resistor is also connected to the open circuit detection circuit, and the other end of the sampling resistor is grounded. The sampling resistor converts the coil current of the electromagnetic coil into a sampling voltage, and the open circuit detection circuit detects the sampling voltage through the sampling resistor.

[0016] In one possible implementation, the control module further includes: an isolation communication unit;

[0017] The control unit is specifically used to send fault information to the circuit breaker via the isolation communication unit, so that the circuit breaker can issue corresponding alarm information based on the received fault information.

[0018] In one possible implementation, the control module further includes: a power supply unit and a voltage detection circuit, wherein the power supply unit includes: a rectifier circuit;

[0019] The input terminal of the power supply unit is used to connect to the power supply voltage, the output terminal of the power supply unit is connected to the input terminal of the voltage detection circuit, and the output terminal of the voltage detection circuit is connected to the control unit.

[0020] The power supply unit rectifies and steps down the power supply voltage through a rectifier circuit, and then uses the rectified and stepped-down power supply voltage to power the intelligent tripping device.

[0021] The voltage detection circuit is used to perform voltage division, tracking, and filtering on the power supply voltage output by the power supply unit, and then send the processed power supply voltage to the control unit.

[0022] A second aspect of this application provides a fault detection method, which is applied to a control unit in the intelligent tripping device described in the first aspect above, the method comprising:

[0023] Acquire the electrical pulse signal sent by the photoelectric sensor;

[0024] Acquire vibration signals sent by the vibration sensor;

[0025] Obtain the sampling voltage sent by the disconnection detection circuit;

[0026] Based on the electrical pulse signal, vibration signal, and sampled voltage, the fault information of the trip module is determined and output. The fault information includes electrical fault information and mechanical fault information.

[0027] One possible implementation involves determining and outputting fault information of the trip module based on electrical pulse signals, vibration signals, and sampled voltages, including:

[0028] Obtain the power supply voltage, the voltage drop of the rectifier circuit, the impedance of the electromagnetic coil, the on-resistance of the power devices in the electromagnetic coil drive unit, and the resistance value of the sampling resistor.

[0029] The current in the sampling resistor is determined based on the power supply voltage, the voltage drop of the rectifier circuit, the impedance of the electromagnetic coil, the on-resistance of the power device, and the resistance value of the sampling resistor.

[0030] The sampling voltage of the sampling resistor is determined based on the current and resistance of the sampling resistor.

[0031] Based on the current and sampling voltage of the sampling resistor, the impedance of the electromagnetic coil, and the conduction impedance of the power device, the electrical fault information of the trip module is determined and output. The electrical fault information includes: electromagnetic coil fault information and power device fault information. The electromagnetic coil fault information includes: electromagnetic coil open wire fault and electromagnetic coil insulation fault. The power device fault information includes: power device breakdown short circuit fault.

[0032] When the sampling voltage of the sampling resistor reaches the preset value, the mechanical fault information of the trip module is determined and output based on the vibration signal and electrical pulse signal.

[0033] One possible implementation involves determining the current in the sampling resistor based on the power supply voltage, the voltage drop across the rectifier circuit, the impedance of the electromagnetic coil, the on-resistance of the power device, and the resistance value of the sampling resistor. This includes:

[0034] Calculate the voltage difference between the power supply voltage and the voltage drop across the rectifier circuit;

[0035] Calculate the first sum between the impedance of the electromagnetic coil and the on-resistance of the power device;

[0036] Calculate the second sum between the first sum and the resistance value of the sampling resistor;

[0037] Calculate the quotient of the voltage difference and the second sum;

[0038] The current in the sampling resistor is determined by the quotient of the voltage difference and the second sum.

[0039] One possible implementation involves determining and outputting electrical fault information of the trip module based on the current and sampling voltage of the sampling resistor, the impedance of the electromagnetic coil, and the on-resistance of the power device, including:

[0040] If the current through the sampling resistor is 0 and the sampling voltage through the sampling resistor is 0, then it is determined that there is an open circuit fault in the electromagnetic coil of the trip module.

[0041] If the impedance of the electromagnetic coil decreases and the sampling voltage of the sampling resistor increases, it is determined that there is an insulation fault in the electromagnetic coil of the trip module.

[0042] If the on-resistance of the power device decreases and the sampling voltage of the sampling resistor increases slightly or remains unchanged, it is determined that there is a short-circuit fault in the power device in the trip module.

[0043] One possible implementation involves determining and outputting mechanical fault information of the trip module based on vibration and electrical pulse signals, including:

[0044] The motion information of the moving iron core is determined based on the electrical pulse signal;

[0045] Determine the motion intensity of the moving iron core based on the vibration signal;

[0046] Based on the motion information of the moving iron core, the motion intensity of the moving iron core, and the preset vibration signal, the mechanical fault information of the trip module is determined and output.

[0047] One possible implementation involves determining the motion intensity of the moving iron core based on vibration signals, including:

[0048] The vibration signal is converted into a frequency domain signal and then into a time-frequency domain signal. The vibration signal includes a time domain signal.

[0049] Feature extraction is performed on time-domain signals, frequency-domain signals, and time-frequency-domain signals to obtain the corresponding time-domain features, frequency-domain features, and time-frequency-domain features;

[0050] The motion intensity of the moving iron core is determined based on its time-domain characteristics, frequency-domain characteristics, and time-frequency-domain characteristics.

[0051] A third aspect of this application provides a computer device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the fault detection method described in the second aspect is implemented when the computer program is executed by the processor.

[0052] A fourth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the fault detection method described in the second aspect above.

[0053] The beneficial effects of the embodiments of this application include:

[0054] This application provides an intelligent tripping device, which comprises a tripping module, a photoelectric sensor, and a control module. The tripping module includes a photoelectric sensor stop, an electromagnetic coil, and a moving iron core. The control module includes a control unit, a vibration sensor, a wire breakage detection circuit, and an electromagnetic coil drive unit. The photoelectric sensor detects the light signal blocked by the photoelectric sensor stop in the tripping module when it moves, generates a corresponding electrical pulse signal, and sends it to the control unit. The vibration sensor detects the vibration signal of the moving iron core in the tripping module in real time and sends it to the control unit. The wire breakage detection circuit detects the sampling voltage of the sampling resistor in the electromagnetic coil drive unit in real time and sends the sampling voltage to the control unit. The control unit determines the mechanical fault information of the tripping module based on the vibration signal and the electrical pulse signal, and determines the electrical fault information of the tripping module based on the sampling voltage. This simultaneously satisfies the electrical and mechanical fault detection requirements of the tripping device, thereby improving the accuracy and reliability of the fault detection results. Attached Figure Description

[0055] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0056] Figure 1 A cross-sectional view of an intelligent tripping device provided in an embodiment of this application;

[0057] Figure 2 This is a schematic diagram of the structure of the first intelligent tripping device provided in the embodiments of this application;

[0058] Figure 3 A coil control circuit diagram provided for an embodiment of this application;

[0059] Figure 4 This is a schematic diagram of the structure of the second intelligent tripping device provided in the embodiments of this application;

[0060] Figure 5 This is a standby schematic diagram of an intelligent tripping device provided in an embodiment of this application;

[0061] Figure 6 This is a schematic diagram of the operation of an intelligent tripping device provided in an embodiment of this application;

[0062] Figure 7 A schematic diagram of a photoelectric waveform provided in an embodiment of this application;

[0063] Figure 8 A flowchart of the first fault detection method provided in the embodiments of this application;

[0064] Figure 9 A flowchart of the second fault detection method provided in the embodiments of this application;

[0065] Figure 10 A flowchart of the third fault detection method provided in the embodiments of this application;

[0066] Figure 11 A flowchart of the fourth fault detection method provided in the embodiments of this application;

[0067] Figure 12 A flowchart of the fifth fault detection method provided in the embodiments of this application;

[0068] Figure 13 This is a schematic diagram of the structure of a computer device provided in an embodiment of this application.

[0069] Figure descriptions: 10: Intelligent tripping device; 101: Tripping module; 1011: Photoelectric sensor stop bar; 1012: Electromagnetic coil; 1013: Moving iron core; 102: Control module; 1021: Control unit; 1022: Vibration sensor; 1023: Wire breakage detection circuit; 1024: Electromagnetic coil drive unit; 241: Coil control circuit; 2411: N-type metal-oxide-semiconductor transistor; 2412: Sampling resistor; 1025: Power supply unit; 251: Rectifier circuit; 1026: Voltage detection circuit; 1027: Isolation communication unit; 103: Photoelectric sensor. Detailed Implementation

[0070] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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 application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0071] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0072] Currently, intelligent trip units often incorporate input voltage detection circuits, electromagnetic coil continuity detection circuits, and communication modules. The intelligent trip unit detects its input voltage via the input voltage detection circuit, detects the continuity of the electromagnetic coil via the electromagnetic coil continuity detection circuit, and then feeds the detection results back to the circuit breaker via the communication module. The circuit breaker then implements corresponding response strategies based on the received detection results. However, this approach only supports input voltage detection and electromagnetic coil continuity detection, which cannot meet the needs of intelligent trip units for both electrical and mechanical fault detection.

[0073] To address this, this application provides an intelligent tripping device. A photoelectric sensor detects in real-time the light signal blocked by the photoelectric sensor lever in the tripping module when it moves, generating a corresponding electrical pulse signal and sending it to the control unit. A vibration sensor detects in real-time the vibration signal of the moving iron core in the tripping module and sends it to the control unit. A wire breakage detection circuit detects in real-time the sampling voltage of the sampling resistor in the electromagnetic coil drive unit and sends this sampling voltage to the control unit. The control unit determines the mechanical fault information of the tripping module based on the vibration signal and the electrical pulse signal, and determines the electrical fault information of the tripping module based on the sampling voltage. This simultaneously satisfies the electrical and mechanical fault detection requirements of the tripping device, thereby improving the accuracy and reliability of the fault detection results.

[0074] The intelligent tripping device and fault detection method provided in the embodiments of this application will be explained in detail below with reference to the accompanying drawings.

[0075] Figure 1 See the cross-sectional view of an intelligent tripping device provided in this application. Figure 1The intelligent tripping device provided in this application includes: an electromagnetic coil 1, a moving iron core 2, a photoelectric sensor 3, a magnetic yoke 4, a control module 5, a photoelectric sensor stop bar 6, and a magnetic yoke cover plate 7. The electromagnetic coil 1, the moving iron core 2, the magnetic yoke 4, the photoelectric sensor stop bar 6, and the magnetic yoke cover plate 7 are all structural parts of the tripping device. The enameled wire tap of the electromagnetic coil 1 is welded to the control module. The photoelectric sensor 3 is installed at the bottom of the magnetic yoke 4 inside the tripping device. The control module 5 is installed inside the tripping device and fixed to the plastic housing of the tripping device by screws, so that the control module 5 and the various hardware structures of the tripping module establish a hardware connection relationship.

[0076] It is worth noting that the failures of intelligent trip units are mainly divided into two types: electrical failures and mechanical failures. Electrical faults in intelligent trip units mainly include: damaged electromagnetic coil insulation, poor electromagnetic coil contact, short circuit of electromagnetic coil turns, burnt-out electromagnetic coil wires, and abnormal electromagnetic coil drive circuits. Although electrical faults mainly present changes in electrical characteristics, most of them are indirectly caused by mechanical faults. For example, when mechanically jammed, the electromagnetic coil may burn out due to prolonged energization, or the electromagnetic coil may overheat due to prolonged energization, leading to the detachment of the external insulation and short circuit of the electromagnetic coil turns. Mechanical faults in intelligent trip units mainly include: screw jamming on the guide rod, loose magnetic yoke cover plate, increased stroke of the moving iron core, and mechanism jamming. Screw jamming is a slow and gradual process. When the intelligent trip unit has been used for a long time, the screws may rust, causing them to jam. When the moving iron core and the stationary iron core are closed, the impact force on the magnetic yoke cover plate is large, which can cause the magnetic yoke cover plate to loosen. After many impacts, the screws locking the mechanism may loosen, which can also cause the magnetic yoke cover plate to loosen. In addition, excessive tripping of the intelligent trip unit can lead to an increased distance between the moving iron core and the stationary iron core, which in turn increases the stroke of the moving iron core; mechanism jamming is often caused by jamming of the linkage mechanism connected to the guide rod, which in turn leads to the circuit breaker refusing to operate.

[0077] Figure 2 See the structural schematic diagram of the first intelligent tripping device provided in this application. Figure 2 The intelligent tripping device 10 provided in this application embodiment includes: a tripping module 101, a photoelectric sensor 103, and a control module 102. The tripping module 101 includes: a photoelectric sensor stop bar 1011, an electromagnetic coil 1012, and a moving iron core 1013. The control module 102 includes: a control unit 1021, a vibration sensor 1022, a wire breakage detection circuit 1023, and an electromagnetic coil drive unit 1024.

[0078] The electromagnetic coil 1012 is connected to the output terminal of the electromagnetic coil drive unit 1024, the input terminal of the electromagnetic coil drive unit 1024 is connected to the control unit 1021, and the sampling terminal of the electromagnetic coil drive unit 1024 is connected to the input terminal of the wire breakage detection circuit 1023.

[0079] Optionally, the input terminal of the electromagnetic coil drive unit 1024 is connected to the control unit 1021, and the output terminal of the electromagnetic coil drive unit 1024 is connected to the electromagnetic coil 1012. Under the control of the control unit 1021, the electromagnetic coil drive unit 1024 provides drive current to the electromagnetic coil 1012 in the trip module 101.

[0080] Optionally, the sampling terminal of the electromagnetic coil driving unit 1024 is connected to the input terminal of the wire breakage detection circuit 1023, and the electromagnetic coil driving unit 1024 transmits the sampled voltage to the wire breakage detection circuit 1023.

[0081] Optionally, the electromagnetic coil drive unit 1024 is used to convert the control voltage sent by the control unit 1021 to the electromagnetic coil 1012 in the trip module 101 into a drive signal for the electromagnetic coil 1012. The electromagnetic coil drive unit 1024 applies the converted drive signal to the electromagnetic coil 1012 in the trip module 101, providing a drive signal and drive energy for the operation of the electromagnetic coil 1012, thereby realizing the control of the operation of the trip module 101.

[0082] Optionally, the electromagnetic coil drive unit 1024 includes a power device that controls the on / off state of the electromagnetic coil 1012. The power device is connected in series with the electromagnetic coil 1012 in the trip module 101. When the power device is turned on, the coil current of the electromagnetic coil 1012 in the trip module 101 flows through the power device, and the electromagnetic force generated by the electromagnetic coil 1012 drives the moving iron core 1013 in the trip module 101 to move.

[0083] The output terminals of the wire breakage detection circuit 1023, the photoelectric sensor 103, and the vibration sensor 1022 are all connected to the control unit 1021.

[0084] The photoelectric sensor 103 is used to detect the light signal blocked by the photoelectric sensor stop bar 1011 on the moving iron core 1013 when it moves, generate an electrical pulse signal, and send the electrical pulse signal to the control unit 1021.

[0085] Optionally, when the trip module 101 is not activated, the moving iron core 1013 in the trip module 101 does not change position, and the photoelectric sensor stop 1011 is also not activated. The output level of the photoelectric sensor 103 can be either high or low. When the trip module 101 is activated, the moving iron core 1013 in the trip module 101 is displaced and activated under the electromagnetic force of the electromagnetic coil 1012. The photoelectric sensor stop 1011 enters the interior of the photoelectric sensor 103, and the electrical pulse signal output by the photoelectric sensor 103 will be reversed, such as the high level output by the photoelectric sensor 103 becoming low, or the low level output by the photoelectric sensor 103 becoming high.

[0086] It is worth noting that for some holding-type shunt trip units or holding-type closed trip units, the moving iron core will remain in the position after the moving iron core has been displaced after the trip is activated. At this time, the electrical pulse signal output by the photoelectric sensor is opposite to the electrical pulse signal output by the trip module when it has not been activated.

[0087] Optionally, the photoelectric sensor 103 is connected to the control module 102 via a lead wire through a sensor interface. The photoelectric sensor 103 monitors the movement of the photoelectric sensor stop bar 1011 to obtain the movement and position changes of the moving iron core 1013 in the trip module 101.

[0088] The vibration sensor 1022 is used to detect the vibration signal of the moving iron core 1013 in the trip module 101 in real time and send the vibration signal to the control unit 1021.

[0089] Optionally, when the moving iron core 1013 in the trip module 101 moves, the vibration signal caused by the movement of the moving iron core 1013 is identified by the vibration sensor 1022. The vibration sensor 1022 converts the identified vibration signal into an electrical signal and transmits the converted electrical signal to the control unit 1021. The control unit 1021 analyzes the electrical signal transmitted by the vibration sensor 1022 to determine the action of the moving iron core 1013 in the trip module 101. The control unit 1021 determines whether there is a mechanical fault in the trip module 101 based on the electrical signal corresponding to the vibration signal of the moving iron core 1013.

[0090] The open circuit 1023 is used to detect the sampling voltage of the sampling resistor 2412 in the electromagnetic coil drive unit 1024 in real time and send the sampling voltage to the control unit 1021.

[0091] Optionally, the electromagnetic coil driving unit 1024 includes a sampling resistor 2412, which is used to convert the coil current output by the electromagnetic coil 1012 into a corresponding sampling voltage. The open circuit 1023 is connected to the sampling resistor 2412 in the electromagnetic coil driving unit 1024. The open circuit 1023 collects the terminal voltage of the sampling resistor 2412 and sends the collected terminal voltage as a sampling voltage to the control unit 1021.

[0092] The control unit 1021 determines and outputs fault information of the trip module 101 based on the electrical pulse signal, vibration signal and sampling voltage.

[0093] Optionally, the control unit 1021 determines the fault information of the trip module 101 based on the electrical pulse signal transmitted by the photoelectric sensor 103, the vibration signal transmitted by the vibration sensor 1022, and the sampling level transmitted by the wire breakage detection circuit 1023. The fault information is used to indicate the type of fault present in the trip module 101.

[0094] In this embodiment, an intelligent tripping device is composed of a tripping module, a photoelectric sensor, and a control module. The tripping module includes a photoelectric sensor stop, an electromagnetic coil, and a moving iron core. The control module includes a control unit, a vibration sensor, a wire breakage detection circuit, and an electromagnetic coil drive unit. The photoelectric sensor detects the light signal blocked by the photoelectric sensor stop in the tripping module when it moves, generates a corresponding electrical pulse signal, and sends it to the control unit. The vibration sensor detects the vibration signal of the moving iron core in the tripping module in real time and sends it to the control unit. The wire breakage detection circuit detects the sampling voltage of the sampling resistor in the electromagnetic coil drive unit in real time and sends the sampling voltage to the control unit. The control unit determines the mechanical fault information of the tripping module based on the vibration signal and the electrical pulse signal, and determines the electrical fault information of the tripping module based on the sampling voltage. This simultaneously satisfies the electrical and mechanical fault detection requirements of the tripping device, thereby improving the accuracy and reliability of the fault detection results.

[0095] In one alternative implementation, see [link to implementation details]. Figure 3 The electromagnetic coil drive unit 1024 in the intelligent tripping device 10 provided in this application embodiment includes: a coil control circuit 241, wherein the coil control circuit 241 includes: an N-type metal oxide semiconductor transistor 2411 and a sampling resistor 2412.

[0096] It is worth noting that the power device in the electromagnetic coil drive unit 1024 is implemented by an N-type metal-oxide-semiconductor transistor 2411. When the N-type metal-oxide-semiconductor transistor 2411 is turned on, the coil current of the electromagnetic coil 1012 is transmitted to the sampling resistor 2412 through the N-type metal-oxide-semiconductor transistor 2411. The sampling resistor 2412 converts the coil current of the electromagnetic coil 1012 into a sampling voltage.

[0097] In addition, the power device in the electromagnetic coil drive unit 1024 is mainly used to control the connection and disconnection between the electromagnetic coil 1012 in the trip module 101 and the drive power supply. The power device in the electromagnetic coil drive unit 1024 can be implemented by metal oxide semiconductor transistors, transistors, silicon controlled rectifiers, insulated gate bipolar transistors, and coil drive chips, etc. This application takes the N-type metal oxide semiconductor transistor 2411 as an example of the power device in the electromagnetic coil drive unit 1024, but it does not mean that the power device in the electromagnetic coil drive unit 1024 can only be the N-type metal oxide semiconductor transistor 2411. This application does not make any specific limitation in this regard.

[0098] The gate of the N-type metal-oxide-semiconductor transistor 2411 is connected to the control unit 1021, the drain of the N-type metal-oxide-semiconductor transistor 2411 is connected to the electromagnetic coil 1012, the source of the N-type metal-oxide-semiconductor transistor 2411 is connected to one end of the sampling resistor 2412, one end of the sampling resistor 2412 is also connected to the open circuit detection circuit 1023, and the other end of the sampling resistor 2412 is grounded. The sampling resistor 2412 converts the coil current of the electromagnetic coil 1012 into a sampling voltage, and the open circuit detection circuit 1023 detects the sampling voltage through the sampling resistor 2412.

[0099] Optionally, the sampling voltage is used to indicate the voltage signal obtained by the sampling resistor 2412 converting the coil current flowing through the electromagnetic coil 1012. The open circuit detection circuit 1023 obtains the sampling voltage of the sampling resistor 2412, performs signal following processing and filtering processing on the sampling voltage, and sends the processed sampling voltage to the control unit 1021. The control unit 1021 determines the electrical fault of the trip module 101 based on the sampling voltage.

[0100] It is worth noting that the purpose of the open circuit 1023 in performing signal following processing on the sampled voltage is to enable the analog-to-digital converter of the control unit 1021 to transform the input impedance of the sampled voltage.

[0101] In one alternative implementation, see [link to implementation details]. Figure 4 The control module 102 in the intelligent tripping device 10 provided in this application embodiment further includes: an isolation communication unit 1027.

[0102] Optionally, the isolation communication unit 1027 is used to realize communication between the intelligent tripping device 10 and the external circuit breaker. The intelligent tripping device 10 can send the actual operating status and fault information of the tripping module 101 to the external circuit breaker through the isolation communication unit 1027. The external circuit breaker can also send control commands to the intelligent tripping device 10 through the isolation communication unit 1027 to control the operating status of the tripping module 101, so that the tripping module 101 can perform opening and closing tripping actions.

[0103] Optionally, the isolated communication unit 1027 can support both isolated CAN communication mode and isolated 485 communication mode, etc. This application does not make specific limitations in this regard.

[0104] The control unit 1021 is specifically used to send fault information to the circuit breaker via the isolation communication unit 1027, so that the circuit breaker can issue corresponding alarm information based on the received fault information.

[0105] Optionally, the fault information is used to indicate the type of fault present in the trip module 101. After receiving the fault information sent by the control unit 1021, the circuit breaker issues a corresponding alarm message. The alarm message is used to alert the user what type of fault is currently present in the trip module 101, such as jamming, sticking, electromagnetic coil insulation, etc. The alarm message corresponds to the fault information.

[0106] In one alternative implementation, see [link to implementation details]. Figure 4 The control module 102 in the intelligent tripping device 10 provided in this application embodiment further includes: a power supply unit 1025 and a voltage detection circuit 1026. The power supply unit 1025 includes: a rectifier circuit 251.

[0107] Optionally, the power supply unit 1025 includes a rectifier circuit 251, which can be implemented by a rectifier diode or a rectifier bridge. This application does not specifically limit the implementation of the rectifier circuit 251.

[0108] It is worth noting that the rectifier circuit 251 can be used for both AC and DC circuits. When the rectifier circuit 251 is used for DC circuits, it can achieve the function of reversing the polarity.

[0109] The input terminal of the power supply unit 1025 is used to connect to the power supply voltage, the output terminal of the power supply unit 1025 is connected to the input terminal of the voltage detection circuit 1026, and the output terminal of the voltage detection circuit 1026 is connected to the control unit 1021.

[0110] Optionally, the power supply unit 1025 is used to connect to the power supply voltage and supply power to the entire intelligent tripping device 10 based on the power supply voltage. The voltage detection circuit 1026 is used to acquire the power supply voltage output by the power supply unit 1025 in real time and transmit the acquired power supply voltage to the control unit 1021.

[0111] The power supply unit 1025 rectifies and steps down the power supply voltage via the rectifier circuit 251, and supplies power to the intelligent tripping device 10 through the rectified and stepped-down power supply voltage.

[0112] Optionally, the power supply unit 1025 rectifies and steps down the power supply voltage via the rectifier circuit 251 to eliminate harmonic interference signals in the power supply voltage, and provides power to the intelligent tripping device 10 based on the stable power supply voltage after rectification and step-down processing.

[0113] The voltage detection circuit 1026 is used to perform voltage division, tracking and filtering on the power supply voltage output by the power supply unit 1025, and send the processed power supply voltage to the control unit 1021.

[0114] Optionally, the voltage detection circuit 1026 includes a voltage divider module and an operational amplifier module. The voltage divider module is usually implemented by voltage divider resistors, and the operational amplifier module is usually implemented by operational amplifiers. This application does not make specific limitations on this.

[0115] Optionally, the voltage detection circuit 1026 divides the power supply voltage output by the power supply unit 1025 via a voltage divider module. The voltage detection circuit 1026 performs follow-up processing and filtering on the divided power supply voltage via an operational amplifier module, and sends the processed power supply voltage to the control unit 1021. The control unit 1021 samples the power supply voltage via an internally integrated analog-to-digital converter.

[0116] It is worth noting that the analog-to-digital converter integrated inside the control unit 1021 can convert continuous power supply voltage into discrete digital signals to achieve power supply voltage signal tracking.

[0117] Optionally, the voltage detection circuit 1026 is mainly used to detect the real-time control voltage of the trip module 101, and to determine the tripping action that the trip module 101 should theoretically perform based on the real-time control voltage input to the trip module 101.

[0118] In one optional embodiment, the control module 102 comprises a control unit 1021, a power supply unit 1025, a voltage detection circuit 1026, a vibration sensor 1022, an electromagnetic coil drive unit 1024, an isolation communication unit 1027, and a wire breakage detection circuit 1023. The control module 102 detects the control voltage input to the trip module 101 via the voltage detection circuit 1026, detects the vibration signal of the moving iron core 1013 in the trip module 101 via the vibration sensor 1022, determines the position change information of the moving iron core 1013 in the trip module 101 via the electrical pulse signal transmitted by the external photoelectric sensor 103, and obtains the coil current of the electromagnetic coil 1012 in the trip module 101 via the electromagnetic coil drive unit 1024 and the wire breakage detection circuit 1023. Based on the control voltage of the trip module 101, the vibration signal and position change information of the moving iron core 1013 in the trip module 101, and the coil current of the electromagnetic coil 1012 in the trip module 101, the control module 102 realizes functions such as judging the action threshold of the trip module 101, fault detection and fault diagnosis, and transmits the fault detection result of the trip module 101 to the external circuit breaker via the isolation communication unit 1027. The circuit breaker makes corresponding alarms based on the received fault detection results.

[0119] Figure 5 See the standby schematic diagram of an intelligent tripping device provided in this application. Figure 5 When the intelligent tripping device provided in this application embodiment is not in standby mode, the photoelectric sensor stop 6 does not extend into the photoelectric sensor 3, the spring 9 is not stretched or compressed, the spring guide rod 8 does not move, and the moving iron core 2 does not generate displacement.

[0120] Figure 6 See the schematic diagram of an intelligent tripping device provided in this application. Figure 6 When the intelligent tripping device provided in this application embodiment is working, the photoelectric sensor guide rod 6 extends into the photoelectric sensor 3, and the moving iron core 2 moves, causing a change in position.

[0121] Figure 7 A schematic diagram of a photoelectric waveform provided in this application is shown below. Figure 7 In the intelligent tripping device 10 provided in this application embodiment, when the tripping module 101 moves, the photoelectric sensor 103 generates... Figure 7 The photoelectric waveform shown.

[0122] Figure 8 A flowchart of a fault detection method provided in this application is shown. This method can be applied to the control unit in an intelligent tripping device. See [link to flowchart application]. Figure 8 This application provides a fault detection method, including:

[0123] S801, Acquire the electrical pulse signal sent by the photoelectric sensor.

[0124] Optionally, the photoelectric sensor is used to capture in real time the light blocking effect of the photoelectric sensor stop bar on the moving iron core caused by the movement of the photoelectric sensor stop bar under the action of electromagnetic force. The photoelectric sensor generates a corresponding electrical pulse signal based on the light blocking signal of the moving iron core by the photoelectric sensor stop bar, and sends the electrical pulse signal to the control unit through the sensor interface.

[0125] S802 acquires the vibration signal sent by the vibration sensor.

[0126] Optionally, the vibration sensor can be implemented by a triaxial vibration sensor. The vibration sensor is installed in a position close to the moving iron core in the trip module to ensure that the vibration sensor can capture the vibration signal caused by the movement of the moving iron core. The control unit obtains the vibration signal of the moving iron core from the vibration sensor in real time.

[0127] S803 acquires the sampling voltage sent by the disconnection detection circuit.

[0128] Optionally, the disconnection detection circuit acquires the terminal voltage of the sampling resistor in the electromagnetic coil drive unit in real time, and transmits the terminal voltage of the sampling resistor as the sampling voltage of the electromagnetic coil to the control unit.

[0129] Based on the electrical pulse signal, vibration signal, and sampled voltage, S804 determines and outputs the fault information of the trip module, including electrical fault information and mechanical fault information.

[0130] Optionally, the fault information of the trip module is used to indicate the fault type of the trip module. The fault information of the trip module includes electrical fault information and mechanical fault information. The electrical fault information is used to indicate that the electromagnetic coil in the trip module is malfunctioning, and the mechanical fault information is used to indicate the structural fault of each electronic component in the trip module.

[0131] In one possible implementation, see [link to relevant documentation]. Figure 9 The specific operation of step S804 can be as follows:

[0132] S901, obtain the power supply voltage, the voltage drop of the rectifier circuit, the impedance of the electromagnetic coil, the on-resistance of the power devices in the electromagnetic coil drive unit, and the resistance value of the sampling resistor.

[0133] Optionally, the power supply voltage can be measured by the control unit and voltage detection circuit in the control module. The power supply voltage can be represented by U and is used to indicate the supply voltage provided by the power supply to the electromagnetic coil in the trip module.

[0134] Optionally, the voltage drop of the rectifier circuit is used to indicate the voltage drop of the power supply voltage caused by the rectifier circuit based on resistance or friction when the power supply unit rectifies and steps down the power supply voltage through the rectifier circuit. That is, the part of the power supply voltage that is reduced by the rectifier circuit. The voltage drop of the rectifier circuit can be represented by Ud.

[0135] Optionally, the impedance of the electromagnetic coil is determined by the material, number of turns, and length of the electromagnetic coil. The impedance of the electromagnetic coil can be measured and can be represented by Rc. The on-resistance of the power device in the electromagnetic coil drive unit is used to indicate the obstruction of the power device to the alternating current when it is turned on. The on-resistance of the power device in the electromagnetic coil drive unit can be measured and can be represented by Ron. The resistance value of the sampling resistor can be measured in advance and can be represented by Rs.

[0136] S902. Determine the current of the sampling resistor based on the power supply voltage, the voltage drop of the rectifier circuit, the impedance of the electromagnetic coil, the on-resistance of the power device, and the resistance value of the sampling resistor.

[0137] Optionally, the control unit calculates the real-time current of the sampling resistor based on the power supply voltage, the voltage drop of the rectifier circuit in the power supply unit, the impedance of the electromagnetic coil itself, the on-resistance of the power device, and the resistance value of the sampling resistor. The current of the sampling resistor can be represented by Is.

[0138] S903. Determine the sampling voltage of the sampling resistor based on the current and resistance value of the sampling resistor.

[0139] Optionally, the sampling voltage of the sampling resistor can be calculated based on the current and resistance of the sampling resistor.

[0140] S904. Based on the current and sampling voltage of the sampling resistor, the impedance of the electromagnetic coil, and the conduction impedance of the power device, determine and output the electrical fault information of the trip module. The electrical fault information includes: electromagnetic coil fault information and power device fault information. The electromagnetic coil fault information includes: electromagnetic coil open circuit fault and electromagnetic coil insulation fault. The power device fault information includes: power device breakdown short circuit fault.

[0141] Optionally, the control unit determines the electrical fault information of the tripping module based on the real-time current and sampling voltage of the sampling resistor, the impedance of the electromagnetic coil itself, and the conduction impedance of the power device. The electrical fault information includes electromagnetic coil fault information and power device fault information. The electromagnetic coil fault information is used to indicate that there is a circuit fault in the electromagnetic coil, and the power device fault information is used to indicate that there is a circuit fault in the power device.

[0142] Optionally, the electromagnetic coil fault information includes: electromagnetic coil open circuit fault and electromagnetic coil insulation fault. The electromagnetic coil open circuit fault is used to indicate that the electromagnetic coil in the tripping module has failed. The electromagnetic coil insulation fault is used to indicate that the insulation material of the electromagnetic coil is damaged, resulting in coil current leakage or coil open circuit, so that the coil current cannot flow normally through the electromagnetic coil.

[0143] Optionally, the power device fault information includes power device breakdown short-circuit fault. Power device breakdown short-circuit fault is used to indicate that the electric field strength between the plates of the power device exceeds the maximum electric field strength that the plate insulation material can withstand, causing the plate insulation material to lose its insulation ability and become a conductor, that is, the power device has experienced a breakdown short-circuit fault.

[0144] S905. When the sampling voltage of the sampling resistor reaches the preset value, the mechanical fault information of the trip module is determined and output based on the vibration signal and the electrical pulse signal.

[0145] Optionally, the preset value is used to indicate the normal voltage threshold of the converted voltage corresponding to the coil current of the electromagnetic coil in the trip module. When the trip module has a mechanical jamming fault, after the control unit sends the electromagnetic coil drive signal, the sampling voltage obtained by the disconnection detection circuit can reach the normal voltage threshold indicated by the preset value. However, due to the mechanical jamming of the trip module, the moving iron core in the trip module does not move, and the electrical pulse signal transmitted from the photoelectric sensor to the control unit does not change.

[0146] Optionally, when the moving iron core in the trip module becomes stuck due to material rust, although the sampling voltage obtained by the wire breakage detection circuit can reach the normal voltage threshold indicated by the preset value, the waveform of the electrical pulse signal output by the photoelectric sensor will change, and the pulse width of the electrical pulse signal will become longer or larger.

[0147] Optionally, when the trip module operates normally, the vibration sensor will collect the vibration signal generated by the movement of the moving iron core in the trip module under the electromagnetic force of the electromagnetic coil in real time. The intensity of the vibration signal collected by the vibration sensor is related to the magnitude of the coil current of the electromagnetic coil, the pulse width of the control signal of the electromagnetic coil, and the elastic force of the spring in the trip module.

[0148] Optionally, the waveforms of vibration signals collected by vibration sensors during normal operation of each device in the trip module are pre-acquired, and the waveform of the vibration signal under normal operation of the trip module is used as the standard vibration signal waveform. Based on the comparison between the waveform of the real-time vibration signal of the trip module and the standard vibration signal waveform, the mechanical fault of the trip module is determined.

[0149] Optionally, if the peak intensity of the vibration signal received by the vibration sensor is weaker than the peak intensity of the standard vibration signal waveform, then there is a jamming problem in the moving iron core of the trip module or the spring force in the trip module is weakened; if the magnetic yoke cover plate connection of the trip module is loose or the moving iron core is jammed, then compared with the waveform of the standard vibration signal, the peak intensity of the vibration signal received by the vibration sensor is weakened, and the waveform glitches and noise of the vibration signal will increase.

[0150] In one possible implementation, step S902 can specifically be:

[0151] Calculate the voltage difference between the power supply voltage and the voltage drop across the rectifier circuit;

[0152] Calculate the first sum between the impedance of the electromagnetic coil and the on-resistance of the power device;

[0153] Calculate the second sum between the first sum and the resistance value of the sampling resistor;

[0154] Calculate the quotient of the voltage difference and the second sum;

[0155] The current in the sampling resistor is determined by the quotient of the voltage difference and the second sum.

[0156] In one possible implementation, see [link to relevant documentation]. Figure 10 The specific operation of step S904 can be as follows:

[0157] S1001. If the current of the sampling resistor is equal to 0 and the sampling voltage of the sampling resistor is equal to 0, then it is determined that there is an electromagnetic coil open circuit fault in the trip module.

[0158] S1002. If the impedance of the electromagnetic coil decreases and the sampling voltage of the sampling resistor increases, then it is determined that there is an electromagnetic coil insulation fault in the trip module.

[0159] S1003. If the on-resistance of the power device decreases and the sampling voltage of the sampling resistor increases slightly or remains unchanged, then it is determined that there is a short-circuit fault in the power device in the trip module.

[0160] It is worth noting that the premise for the trip module to have a power device breakdown short circuit fault is that when the electromagnetic coil is not activated, the conduction impedance of the power device decreases, the sampling voltage of the sampling resistor increases slightly or remains unchanged, that is, the power device is abnormally conducting, which leads to the power device breakdown short circuit fault.

[0161] For example, when the power supply of the intelligent trip device is a DC power supply, the control unit detects that the input power voltage of the intelligent trip device is U, the voltage detection circuit detects that the voltage drop of the rectifier circuit in the power supply unit is Ud, and the impedance of the electromagnetic coil is measured in advance as Rc, the on-resistance of the N-type metal-oxide-semiconductor transistor in the electromagnetic coil drive unit is Ron, and the resistance of the sampling resistor in the electromagnetic coil drive unit is Rs. Then, the current of the sampling resistor is Is = (U - Ud) / (Rc + Ron + Rs); if the power supply of the intelligent trip device is an AC power supply, then the current of the sampling resistor is Is = 0.9U / (Rc +Ron+Rs); The sampling voltage Us of the sampling resistor = Rs*Is = Rs*(U-Ud) / (Rc+Ron+Rs); When the trip module has an electromagnetic coil open circuit fault, the current Is of the sampling resistor is 0, and the sampling voltage Us of the sampling resistor is approximately 0; When the trip module has an electromagnetic coil insulation fault, the impedance Rc of the electromagnetic coil will decrease, and the sampling voltage Us of the sampling resistor will increase; When the intelligent trip device has a power device breakdown short circuit fault, the conduction impedance Ron of the power device will decrease. Since the conduction impedance of the power device itself is small, the sampling voltage Us of the sampling resistor remains basically unchanged.

[0162] In summary, the control unit can determine the electrical fault information of the intelligent tripping device based on the sampling voltage of the sampling resistor in the electromagnetic coil drive power supply.

[0163] In one possible implementation, see [link to relevant documentation]. Figure 11 The specific operation of step S905 can be as follows:

[0164] S1101. Determine the motion information of the moving iron core based on the electrical pulse signal.

[0165] Optionally, the motion information of the moving iron core in the tripping module can be determined based on the electrical pulse signal transmitted by the photoelectric sensor. The motion information of the moving iron core is used to indicate the action of the moving iron core under the electromagnetic force of the electromagnetic coil.

[0166] S1102. Determine the motion intensity of the moving iron core based on the vibration signal.

[0167] Optionally, the motion intensity of the moving iron core is used to indicate the amplitude and force of the movement of the moving iron core in the trip module under the electromagnetic force of the electromagnetic coil. When there is a mechanical fault in the trip module, the frequency, amplitude, and phase of the vibration signal caused by the moving iron core will change.

[0168] S1103. Based on the motion information of the moving iron core, the motion intensity of the moving iron core, and the preset vibration signal, determine and output the mechanical fault information of the trip module.

[0169] Optionally, a preset vibration signal is used to indicate the vibration signal caused by the moving iron core under normal operating conditions of the trip module. Based on the comparison results between the motion information and motion intensity of the moving iron core and the frequency, amplitude, phase, and other characteristics of the vibration signal indicated by the preset vibration signal, the mechanical fault type of the trip module is determined.

[0170] In one possible implementation, see [link to relevant documentation]. Figure 12 The specific operation of step S1102 can be as follows:

[0171] S1201. Convert the vibration signal into a frequency domain signal and then into a time-frequency domain signal. The vibration signal includes a frequency domain signal.

[0172] Optionally, the vibration signal acquired by the vibration sensor can be preprocessed, i.e., the vibration signal of the acquired moving iron core can be subjected to noise reduction operations such as denoising, filtering, and normalization to improve the quality and accuracy of the vibration signal. The vibration signal is a time-domain signal, which indicates an analog signal in the time dimension and represents the process of vibration signal changing over time.

[0173] Optionally, the vibration signal is converted into a frequency domain signal based on Fourier transform. The vibration signal is used to indicate the analog signal generated when the moving iron core moves, and the frequency domain signal is used to indicate the frequency characteristics of the vibration signal, so as to facilitate the analysis of the vibration signal through the spectral characteristics. Alternatively, the vibration signal is converted into a time-frequency domain signal based on wavelet transform. The time-frequency domain signal is used to indicate the vibration signal in both the time dimension and the frequency dimension.

[0174] S1202. Extract features from the time-domain signal, frequency-domain signal, and time-frequency-domain signal to obtain the time-domain features, frequency-domain features, and time-frequency-domain features of the vibration signal.

[0175] Optionally, feature extraction of the time-domain signal can yield the time-domain features of the vibration signal, which are used to indicate the mean, variance, peak value, and other characteristics of the vibration signal relative to the time axis. Feature extraction of the frequency-domain signal can yield the frequency-domain features of the vibration signal, which are used to indicate the spectrum, power density, and other characteristics of the vibration signal. Feature extraction of the time-frequency-domain signal can yield the time-frequency-domain features, which are used to indicate the wavelet transform coefficients and other characteristics of the vibration signal.

[0176] S1203. Determine the motion strength of the moving iron core based on the time domain characteristics, frequency domain characteristics, and time-frequency domain characteristics.

[0177] Optionally, the motion intensity of the moving iron core in the trip module is determined based on the time-domain characteristics, frequency-domain characteristics, and time-frequency-domain characteristics of the vibration signal. The motion intensity of the moving iron core is used to indicate data such as the motion force and motion amplitude of the moving iron core in the trip module.

[0178] It is worth noting that, based on the characteristics of the fault types of the tripping module, appropriate features are selected from the time-domain, frequency-domain, and time-frequency-domain features of the vibration signal for spectral analysis.

[0179] For example, when the trip module has mechanical faults such as jamming or sticking, the vibration signal waveform caused by the moving iron core will contain abnormal impact or harmonic components; when the trip module has mechanical faults such as loose magnetic yoke cover, the vibration signal caused by the moving iron core will exhibit low-frequency fluctuations; when the trip module has mechanical faults such as spring failure, the amplitude of the vibration signal caused by the moving iron core will decrease and the frequency will shift.

[0180] As an optional implementation, a large amount of vibration signal data from normal operation and fault operation of the trip module is collected. A fault diagnosis model is trained based on the collected vibration signal data and deployed in the intelligent trip device. The fault diagnosis model determines the fault type of the intelligent trip device based on its real-time vibration data, and the circuit breaker issues corresponding alarm information based on the fault type. Furthermore, the fault diagnosis model is regularly updated and optimized to adapt to improvements in the trip module and to adjust the positions of the vibration and photoelectric sensors in real time based on the data generated during the operation of the intelligent trip device, thereby improving the accuracy and reliability of data acquisition by the intelligent trip device.

[0181] The following describes the equipment and computer-readable storage medium used to implement the fault detection method provided in this application. The specific implementation process and technical effects are described above and will not be repeated below.

[0182] Figure 13 This is a schematic diagram of the structure of a computer device provided in an embodiment of this application. See also... Figure 13 The computer device includes a memory 1301 and a processor 1302. The memory 1301 stores a computer program that can run on the processor 1302. When the processor 1302 executes the computer program, it implements the steps in any of the above method embodiments.

[0183] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, can implement the steps in the various method embodiments described above.

[0184] Optionally, this application also provides a program product, such as a computer-readable storage medium, including a program that, when executed by a processor, performs an embodiment of any of the fault detection methods described above.

[0185] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in the form of hardware plus software functional units.

[0186] The integrated units implemented as software functional units described above can be stored in a computer-readable storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute certain steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0187] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0188] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An intelligent tripping device, characterized in that, The intelligent tripping device includes: a tripping module, a photoelectric sensor, and a control module. The tripping module includes: a photoelectric sensor stop bar, an electromagnetic coil, and a moving iron core. The control module includes: a control unit, a vibration sensor, a wire breakage detection circuit, and an electromagnetic coil drive unit. The electromagnetic coil is connected to the output terminal of the electromagnetic coil driving unit, the input terminal of the electromagnetic coil driving unit is connected to the control unit, and the sampling terminal of the electromagnetic coil driving unit is connected to the input terminal of the wire breakage detection circuit. The output terminals of the wire breakage detection circuit, the photoelectric sensor, and the vibration sensor are all connected to the control unit. The photoelectric sensor is used to detect the light signal blocked by the photoelectric sensor stop bar on the moving iron core when the photoelectric sensor stop bar moves, generate an electrical pulse signal, and send the electrical pulse signal to the control unit; The vibration sensor is used to detect the vibration signal of the moving iron core in the tripping module in real time and send the vibration signal to the control unit; The open circuit is used to detect the sampling voltage of the sampling resistor in the electromagnetic coil drive unit in real time, and send the sampling voltage to the control unit. The control unit determines and outputs the fault information of the tripping module based on the electrical pulse signal, the vibration signal, and the sampled voltage.

2. The intelligent tripping device according to claim 1, characterized in that, The electromagnetic coil driving unit includes: a coil control circuit, which includes: an N-type metal-oxide-semiconductor transistor and a sampling resistor; The gate of the N-type metal-oxide-semiconductor transistor is connected to the control unit, the drain of the N-type metal-oxide-semiconductor transistor is connected to the electromagnetic coil, the source of the N-type metal-oxide-semiconductor transistor is connected to one end of the sampling resistor, one end of the sampling resistor is also connected to the open circuit detection circuit, and the other end of the sampling resistor is grounded. The sampling resistor converts the coil current of the electromagnetic coil into a sampling voltage, and the open circuit detection circuit detects the sampling voltage via the sampling resistor.

3. The intelligent tripping device according to claim 1, characterized in that, The control module further includes: an isolation communication unit; The control unit is specifically used to send the fault information to the circuit breaker via the isolation communication unit, so that the circuit breaker can issue corresponding alarm information based on the received fault information.

4. The intelligent tripping device according to claim 1, characterized in that, The control module further includes a power supply unit and a voltage detection circuit, wherein the power supply unit includes a rectifier circuit. The input terminal of the power supply unit is used to connect to the power supply voltage, the output terminal of the power supply unit is connected to the input terminal of the voltage detection circuit, and the output terminal of the voltage detection circuit is connected to the control unit. The power supply unit rectifies and steps down the power supply voltage via the rectifier circuit, and supplies power to the intelligent tripping device through the rectified and stepped-down power supply voltage. The voltage detection circuit is used to perform voltage division, tracking, and filtering on the power supply voltage output by the power supply unit, and then send the processed power supply voltage to the control unit.

5. A fault detection method, characterized in that, The method, applied to the control unit in the intelligent tripping device according to any one of claims 1-4, comprises: Acquire the electrical pulse signal sent by the photoelectric sensor; Acquire the vibration signal sent by the vibration sensor; Obtain the sampling voltage sent by the disconnection detection circuit; Based on the electrical pulse signal, the vibration signal, and the sampling voltage, the fault information of the tripping module is determined and output, including electrical fault information and mechanical fault information.

6. The fault detection method according to claim 5, characterized in that, The step of determining and outputting fault information of the tripping module based on the electrical pulse signal, the vibration signal, and the sampled voltage includes: The power supply voltage, the voltage drop of the rectifier circuit, the impedance of the electromagnetic coil, the on-resistance of the power devices in the electromagnetic coil drive unit, and the resistance value of the sampling resistor are obtained. The current in the sampling resistor is determined based on the power supply voltage, the voltage drop of the rectifier circuit, the impedance of the electromagnetic coil, the on-resistance of the power device, and the resistance value of the sampling resistor. The sampling voltage of the sampling resistor is determined based on the current of the sampling resistor and the resistance value of the sampling resistor; Based on the current and sampling voltage of the sampling resistor, the impedance of the electromagnetic coil, and the conduction impedance of the power device, the electrical fault information of the tripping module is determined and output. The electrical fault information includes: electromagnetic coil fault information and power device fault information. The electromagnetic coil fault information includes: electromagnetic coil open circuit fault and electromagnetic coil insulation fault. The power device fault information includes: power device breakdown short circuit fault. When the sampling voltage of the sampling resistor reaches a preset value, the mechanical fault information of the tripping module is determined and output based on the vibration signal and the electrical pulse signal.

7. The fault detection method according to claim 6, characterized in that, The step of determining the current of the sampling resistor based on the power supply voltage, the voltage drop of the rectifier circuit, the impedance of the electromagnetic coil, the on-resistance of the power device, and the resistance value of the sampling resistor includes: Calculate the voltage difference between the power supply voltage and the voltage drop of the rectifier circuit; Calculate the first sum between the impedance of the electromagnetic coil and the on-resistance of the power device; Calculate a second sum between the first sum and the resistance value of the sampling resistor; Calculate the quotient of the voltage difference and the second sum; The current in the sampling resistor is determined based on the quotient of the voltage difference and the second sum.

8. The fault detection method according to claim 6, characterized in that, The step of determining and outputting the electrical fault information of the tripping module based on the current and sampling voltage of the sampling resistor, the impedance of the electromagnetic coil, and the on-resistance of the power device includes: If the current of the sampling resistor is equal to 0 and the sampling voltage of the sampling resistor is equal to 0, then it is determined that the tripping module has an electromagnetic coil open circuit fault. If the impedance of the electromagnetic coil decreases and the sampling voltage of the sampling resistor increases, then it is determined that there is an electromagnetic coil insulation fault in the tripping module. If the on-resistance of the power device decreases and the sampling voltage of the sampling resistor increases slightly or remains unchanged, it is determined that the trip module has a power device breakdown short circuit fault.

9. The fault detection method according to claim 6, characterized in that, The step of determining and outputting the mechanical fault information of the tripping module based on the vibration signal and the electrical pulse signal includes: The motion information of the moving iron core is determined based on the electrical pulse signal; The motion intensity of the moving iron core is determined based on the vibration signal. Based on the motion information of the moving iron core, the motion intensity of the moving iron core, and the preset vibration signal, the mechanical fault information of the tripping module is determined and output.

10. The fault detection method according to claim 9, characterized in that, Determining the motion intensity of the moving iron core based on the vibration signal includes: The vibration signal is converted into a frequency domain signal and then into a time-frequency domain signal, wherein the vibration signal includes a time domain signal; Feature extraction is performed on the time-domain signal, the frequency-domain signal, and the time-frequency-domain signal to obtain corresponding time-domain features, frequency-domain features, and time-frequency-domain features; The motion intensity of the moving iron core is determined based on the time-domain characteristics, the frequency-domain characteristics, and the time-frequency-domain characteristics.

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