Line fault detection method and device, storage medium and electronic equipment

Abstract

The invention discloses a line fault detection method and device, a storage medium and electronic equipment. The method comprises the steps of detecting a reference current value and a load current value in a control circuit of a circuit breaker device when the circuit breaker device connected with a load line is in an open state; under the condition that the reference current value is smaller than the load current value, it is determined that the load line has a short-circuit fault, and the circuit breaker device is controlled to continue to be in the switching-off state; and under the condition that the reference current value is greater than the load current value, controlling the circuit breaker device to be in a closed state, detecting the circuit state of the load circuit in real time, and controlling the opening and closing of the circuit breaker device according to the circuit state. The technical problem of blind reclosing caused by misjudgment of a line fault due to the fact that a related circuit breaker device cannot detect the type of the line fault is solved.

Description

Technical Field

[0001] The present application relates to the field of electrical control technology, and in particular to a line fault detection method and device, a storage medium, and an electronic device. Background Art

[0002] With the rapid development of social economy, in order to reduce the losses caused by power outages and enhance the transient stability of the power system, electricity-using places such as industry and residence usually add traditional circuit breakers with automatic reclosing function. And the main principle of this traditional circuit breaker is to add an electric operating mechanism to the traditional residual current operated circuit breaker to realize the reclosing function, but its function is still at the level of automatic reclosing operation under abnormal residual current fault, so it can only meet the general requirements of automatic circuit recovery and improvement of power grid power supply continuity. Therefore, when dealing with permanent line faults, traditional circuit breakers still try to reclose, which not only affects the stability of the power system, but also may increase the risk of equipment damage. Especially after the power supply line suffers a short-circuit shock, the traditional circuit breaker lacks the ability to effectively prevent reclosing to the faulty line, which greatly reduces the system safety and power supply continuity.

[0003] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0004] The embodiments of the present application provide a line fault detection method and device, a storage medium, and an electronic device to at least solve the technical problem of blindly reclosing the circuit breaker due to misjudgment of the line fault because the relevant circuit breaker device cannot detect the line fault type.

[0005] According to one aspect of an embodiment of the present application, a line fault detection method is provided, comprising: when a circuit breaker device connected to a load line is in an open state, detecting a reference current value and a load current value in a control circuit of the circuit breaker device; when the reference current value is not greater than the load current value, determining that a short circuit fault exists in the load line, and controlling the circuit breaker device to continue to be in an open state; when the reference current value is greater than the load current value, controlling the circuit breaker device to be in a closed state, detecting the circuit state of the load line in real time, and controlling the opening and closing of the circuit breaker device according to the circuit state.

[0006] Optionally, the control circuit of the circuit breaker device includes: a first circuit and a second circuit, wherein the first circuit includes an input live wire, a first resistor, a first relay, a first diode, an optocoupler, a second relay and an input neutral wire connected in sequence, and the second circuit includes an input live wire, a first resistor, a first relay, a second diode, a third diode, a second resistor, a third relay, a third resistor, a load neutral wire, and an input neutral wire connected in sequence, wherein the reference current value is the current value flowing through the first circuit when the second circuit is not conducting; and the load current value is the current value flowing through the first circuit when the second circuit is conducting.

[0007] Optionally, the control loop of the circuit breaker device also includes: a fourth relay deployed between the input live wire and the load live wire, and a fifth relay deployed between the input neutral wire and the load neutral wire, wherein controlling the circuit breaker device to continue to be in the open state includes: controlling the third relay and the fourth relay to open so that the circuit breaker device continues to be in the open state; controlling the circuit breaker device to be in the closed state includes: controlling the third relay and the fourth relay to close so that the circuit breaker device is in the closed state.

[0008] Optionally, the circuit state of the load line is detected in real time, and the opening and closing of the circuit breaker device is controlled according to the circuit state, including: using a preset detection device to detect the circuit state of the load line in real time, wherein the detection device includes at least one of the following: a residual current transformer, a current transformer, and a voltage transformer, and the circuit state includes: a normal state or a fault state; when the circuit state is in a fault state, the circuit breaker device is controlled to be in an open state; when the circuit state is in a normal state, the circuit breaker device is controlled to be in a closed state.

[0009] Optionally, a preset detection device is used to detect the circuit state of the load line in real time, including: using a residual current transformer to detect the residual current value of the load line in real time, wherein the two ends of the residual current transformer are respectively connected to the input live wire and the input neutral wire in the control circuit of the circuit breaker device; when the residual current value is greater than a preset first threshold value, it is determined that the load line is in a fault state and the abnormal type of the load line is a leakage fault; when the residual current value is not greater than the first threshold value, it is determined that the load line is in a normal state.

[0010] Optionally, a preset detection device is used to detect the circuit status of the load line in real time, including: using a current transformer to detect the real-time current value of the load line in real time, wherein the current transformer is connected to the input live wire in the control circuit of the circuit breaker device; when the real-time current value is greater than a preset second threshold value, it is determined that the load line is in a fault state and the abnormal type of the load line is a short circuit fault; when the real-time current value is not greater than the second threshold value, it is determined that the load line is in a normal state.

[0011] Optionally, a preset detection device is used to detect the circuit status of the load line in real time, including: using a voltage transformer to detect the real-time voltage value of the load line in real time, wherein the two ends of the voltage transformer are respectively connected to the input live wire and the input neutral wire in the control circuit of the circuit breaker device; when the real-time voltage value is higher than a preset high-voltage threshold value or the real-time voltage value is lower than a preset low-voltage threshold value, it is determined that the load line is in a fault state and the abnormal type of the load line is a high-voltage fault or a low-voltage fault; when the real-time voltage value is not higher than the high-voltage threshold value and the real-time voltage value is not lower than the low-voltage threshold value, it is determined that the load line is in a normal state.

[0012] According to another aspect of an embodiment of the present application, a line fault detection device is also provided, including: a detection module, used to detect a reference current value and a load current value in a control circuit of a circuit breaker device connected to a load line in an open state; a first control module, used to determine that a short circuit fault exists in the load line when the reference current value is not greater than the load current value, and to control the circuit breaker device to continue to be in an open state; a second control module, used to control the circuit breaker device to be in a closed state when the reference current value is greater than the load current value, and to detect the circuit state of the load line in real time, and to control the opening and closing of the circuit breaker device according to the circuit state.

[0013] According to another aspect of an embodiment of the present application, a non-volatile storage medium is further provided, the non-volatile storage medium including a stored computer program, wherein the device where the non-volatile storage medium is located executes the above-mentioned line fault detection method by running the computer program.

[0014] According to another aspect of an embodiment of the present application, an electronic device is further provided. The electronic device includes: a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to execute the above-mentioned line fault detection method through the computer program.

[0015] In the embodiment of the present application, the control module detects the reference current value and the load current value in the control circuit of the circuit breaker device when the circuit breaker device is open, and according to the magnitude relationship between the reference current value and the load current value, realizes the state detection of the load line before the circuit breaker device is closed, so as to avoid the instantaneous opening and closing of the circuit breaker due to the line fault, which affects the stability of the power system. At the same time, when the circuit breaker device is closed, the circuit state of the load line is continuously detected to intelligently control the opening and closing of the electrical switch according to the circuit state, so that the load line can safely close the electrical switch in the absence of faults, effectively avoiding the occurrence of dangerous accidents, or automatically and quickly open the circuit breaker device when there is a fault in the load line, so as to ensure the safety of the load line and effectively improve the stability and safety of the power system. The purpose of automatically executing the reclosing and monitoring the circuit state in real time, and effectively improving the stability and safety of the power system under the premise of ensuring the safety of the line is achieved. And then the technical problem of blindly reclosing due to misjudgment of the line fault caused by the inability of the relevant circuit breaker device to detect the line fault type is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 is a flow chart of an optional line fault detection method according to an embodiment of the present application;

[0018] Figure 2 is a structural schematic diagram of a control circuit of an optional circuit breaker device according to an embodiment of the present application;

[0019] Figure 3 is a schematic diagram of an optional leakage fault detection in an embodiment of the present application;

[0020] Figure 4 is a schematic diagram of an optional overcurrent fault detection in an embodiment of the present application;

[0021] Figure 5 is a schematic diagram of an optional high and low voltage fault detection in an embodiment of the present application;

[0022] Figure 6 is a flow chart of an optional line fault detection according to an embodiment of the present application;

[0023] Figure 7 is a structural schematic diagram of an optional line fault detection device according to an embodiment of the present application;

[0024] Figure 8It is a schematic diagram of the structure of an optional electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] In addition, the relevant information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for display, data for analysis, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties. For example, an interface is set up between this system and the relevant user or organization. Before obtaining relevant information, it is necessary to send an acquisition request to the aforementioned user or organization through the interface, and obtain relevant information after receiving the consent information fed back by the aforementioned user or organization.

[0028] In order to better understand the embodiments of the present application, the technical terms involved in the embodiments of the present application are explained as follows:

[0029] Relay: Also known as an electrical switch, it is an electrical control device. When the change of the input quantity (excitation quantity) reaches the specified requirement, it causes the controlled quantity to undergo a predetermined step change in the electrical output circuit. It has an interactive relationship between the control system (also known as the input circuit) and the controlled system (also known as the output circuit). It is usually used in automated control circuits. It is actually an "automatic switch" that uses a small current to control the operation of a large current. Therefore, it plays the role of automatic adjustment, safety protection, and circuit conversion in the circuit.

[0030] Optocoupler (OC), also known as optical isolator or photoelectric isolator, is a group of devices that use light as a medium to transmit electrical signals. Its function is to maintain good isolation between the input and output of electrical signals at ordinary times, and to allow the electrical signals to be transmitted through the isolation layer when necessary.

[0031] Diode: An electronic device made of semiconductor materials (silicon, selenium, germanium, etc.). It has two electrodes: positive electrode (also called anode) and negative electrode (also called cathode). Generally, when a forward voltage is applied between the two electrodes of a diode, the diode is turned on; when a reverse voltage is applied, the diode is turned off. Therefore, a diode has unidirectional conductivity, and the conduction and cutoff of a diode are equivalent to the on and off of a switch.

[0032] Resistor: Also known as resistor, it refers to all electronic or electrical components used to generate resistance. The operation of resistors follows Ohm's law, and its resistance value is defined as the quotient obtained by dividing its voltage by its current.

[0033] Microcontroller Unit (MCU): Also known as a single chip microcomputer or single chip microcomputer, it is a CPU that appropriately reduces the frequency and specifications of the central processing unit (CPU), and integrates memory, timer, USB (Universal Serial Bus), A / D (Analog-to-Digital) conversion, UART (Universal Asynchronous Receiver / Transmitter), PLC (Programmable Logic Controller), DMA (Direct Memory Access) and other peripheral interfaces, and even LCD driver circuits on a single chip to form a chip-level computer, which can be used for different combination controls for different applications. MCUs can be seen in mobile phones, PC peripherals, remote controls, automotive electronics, industrial stepper motors, and robot arm control.

[0034] Residual Current Operated Circuit-Breaker (RCCB) is a mechanical switch used to connect, carry and disconnect current under normal working conditions, and disconnect the contacts when the residual current reaches a specified value under specified conditions. Therefore, when a person is electrocuted or the leakage current of the power grid exceeds the specified value, the residual current operated circuit breaker can quickly cut off the faulty power supply in a very short time to protect the safety of people and electricity use.

[0035] Circuit Breaker: refers to a switch device that can close, carry and disconnect the current under normal circuit conditions and close, carry and disconnect the current under abnormal circuit conditions within a specified time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. Since the boundary between high and low voltage is relatively vague, those above 3kV are generally called high-voltage electrical appliances.

[0036] Example 1

[0037] According to an embodiment of the present application, an embodiment of a line fault detection method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0038] Figure 1 is a flow chart of an optional line fault detection method according to an embodiment of the present application, such as Figure 2 As shown, the method at least includes steps S102-S106, wherein:

[0039] Step S102: When the circuit breaker device connected to the load line is in an open state, a reference current value and a load current value in a control circuit of the circuit breaker device are detected.

[0040] In the technical solution provided in step S102, generally, in order to ensure the normal operation of the circuit, relevant personnel will periodically perform fault detection on the load line. Once the load line has circuit abnormalities at the current moment, such as overcurrent, leakage, high or low voltage, etc., in order to protect the safety of the back-end line, the circuit breaker device immediately connected to the load line is usually placed in an open state, that is, the circuit breaker is opened. A reclosing time is pre-set according to the control module, and when the closing time set by the circuit breaker device starts, a pre-closing detection is performed. The purpose of the detection is to ensure whether the load line is currently in a normal state or a fault state. If the detection is passed, the closing operation can be performed, otherwise continue to wait until the next pre-closing detection. Therefore, the above step S102 can be understood as periodically detecting the reference current value and the load current value in the control circuit of the circuit breaker device when the circuit breaker device connected to the load line is in an open state.

[0041] To this end, the embodiment of the present application proposes that the control module (MCU) with a built-in single-chip microcomputer can detect the reference current value and the load current value of the first loop in the control circuit of the circuit breaker device, and compare the magnitude relationship between the two current values ​​to determine the circuit state of the load line before the circuit breaker device is closed. Among them, the reference current value is the current value of the loop between the input live wire and the input neutral wire, and the load current value is the current value of the loop after the load is added between the input live wire and the input neutral wire.

[0042] As an optional implementation, the control circuit of the circuit breaker device includes: a first loop and a second loop, wherein the first loop includes an input live wire, a first resistor, a first relay, a first diode, an optical coupler, a second relay and an input neutral wire connected in sequence, so the detection loop detects the current value directly from the input live wire to the input neutral wire, and at this time there is no current path through the load in the circuit. The second loop includes an input live wire, a first resistor, a first relay, a second diode, a third diode, a second resistor, a third relay, a second resistor, a load neutral wire, and an input neutral wire connected in sequence, and although the starting point and the end point are the input live wire and the input neutral wire as in the first loop, the introduction of a new load resistor (i.e., the second resistor) changes the internal structure of the detection circuit (i.e., the difference in the participating components and the current path), thereby affecting the current path and magnitude flowing through the optical coupler.

[0043] Therefore, the above-mentioned reference current value can be understood as the current value flowing through the first loop when the second loop is not conducting; and the above-mentioned load current value can be understood as the current value flowing through the first loop when the second loop is conducting.

[0044] It should be explained that the input live wire in the first and second loops is a line with a higher voltage from the power system or power supply. Usually, the input live wire is connected to the positive pole or phase line of the power supply, and is responsible for providing power to the controlled electrical equipment or line. The input neutral wire is a line with a lower voltage from the power system or power supply, wherein, in the AC circuit, the neutral wire is used in conjunction with the live wire to form a current loop so that power can flow; and in the household circuit, the neutral wire is usually connected to the neutral point of the power supply. The output live wire is a line for the circuit breaker device to output power to the load line (such as electrical appliances, lighting equipment or other electrical components) at the rear end, wherein, when the circuit breaker is in a closed state, the output live wire and the input live wire form a complete path of current to supply power to the rear end load. The output neutral wire is a line that provides a current loop to the rear end load together with the output live wire, and is usually at the same potential as the input neutral wire, wherein, in normal power transmission, the current flows out from the input live wire, passes through the rear end load device or line, and then returns to the input neutral wire through the output neutral wire, forming a closed circuit.

[0045] In addition, the control loop of the circuit breaker device also includes: a fourth relay deployed between the input live wire and the load live wire, a fifth relay deployed between the input neutral wire and the load neutral wire, and a control module, wherein the control module is used to control the opening and closing of the first relay, the second relay, the third relay, the fourth relay and the fifth relay, that is, the control module can convert the electrical signal in the circuit into a control signal, and output a high level or a low level through the pin, and control the closing and opening of the relay through the driving chip, wherein the control module can independently control each relay.

[0046] Step S104: when the reference current value is not greater than the load current value, it is determined that a short circuit fault exists in the load line, and the circuit breaker device is controlled to continue to be in an open state.

[0047] In the above case, it indicates that under the short-circuit condition simulated inside the circuit breaker device, the current flowing through the second circuit increases, that is, there is a short-circuit fault in the load line. At this time, the control module controls the circuit breaker device to continue to be in the open state. Specifically, the control module can control the third relay and the fourth relay to open so that the circuit breaker device continues to be in the open state to prevent the short-circuit current from causing further damage to the power system.

[0048] Step S106, when the first current value is greater than the second current value, the circuit breaker device is controlled to be in a closed state, and the circuit state of the load line is detected, and the opening and closing of the circuit breaker device is controlled according to the circuit state.

[0049] In the above case, it indicates that under the short-circuit condition simulated inside the circuit breaker device, the current flowing through the second circuit does not increase abnormally, that is, the load line does not detect a short-circuit fault in the current state. In this case, the control module controls the circuit breaker device to be in a closed state. Specifically, the control module can control the third relay and the fourth relay to be closed so that the circuit breaker device is in a closed state, thereby connecting to the load line.

[0050] For example, Figure 2 is a schematic diagram of a control circuit of an optional circuit breaker device according to an embodiment of the present application, such as Figure 2 As shown. The control loop includes: control module MCU, relay K1 (i.e., the fourth relay), relay K2 (i.e., the fifth relay), relay K3 (i.e., the first relay), relay K4 (i.e., the second relay), relay K5 (i.e., the third relay), optical coupler U1, diode D1 (i.e., the second diode), diode D2 (i.e., the third diode), diode D3 (i.e., the first diode), resistor R1 (i.e., the first resistor), resistor R2 (i.e., the second resistor), resistor R3 (i.e., the third resistor), resistor R4 (one end of which is grounded GND, which is used to properly adjust the current flowing through the optical coupler U1 to prevent the optical coupler from being damaged due to excessive current, and can also suppress noise in the circuit and improve the signal-to-noise ratio of the signal).

[0051] Therefore, in the above Figure 2 In the control circuit shown, the specific steps of detecting the first current value of the first loop and the second current value of the second loop include:

[0052] First, relay K3 and relay K4 are closed, and relay K5 does not work. At this time, after the current flows out from the input live wire and passes through resistors R1 and K3, two loops will be formed, among which: the first loop is relay D3->optical coupler U1->relay K4->input neutral wire; the second loop is diode D1->diode D2->resistor R2->relay K5->load live wire->load neutral wire->input neutral wire (when the load output line is short-circuited, the live wire and neutral wire are turned on, and this loop will be formed). At this time, the output end of the optocoupler U1 of the first loop can be converted into a corresponding electrical signal according to the size of the input electrical signal, and the control module collects the electrical signal value Val1 (i.e., the first current value).

[0053] Then, continue to close the relay K5. At this time, the second circuit becomes diode D1->diode D2->resistor R2->relay K5->resistor R3->load neutral line->input neutral line. And as the distribution of current in the circuit changes, the electrical signal at the output end of the optocoupler U1 of the first circuit will also change, and the control module will collect the electrical signal value Val2 (i.e., the second current value).

[0054] Finally, disconnect relay K3, relay K4, and relay K5, and perform a comparative analysis of the above two electrical signal values. Among them: if Val1 < Val2, it indicates that there is a short circuit in the load line, and the closing operation is not performed, that is, the circuit breaker device is controlled to remain in the open state; if Val1 > Val2, it indicates that there is no short circuit in the load line, and the closing operation can be performed.

[0055] Furthermore, after the circuit breaker device is closed, the control module continues to detect the circuit state of the load line in real time to evaluate the safety of the load line. If an abnormal circuit state is found during subsequent real-time detection, the circuit breaker device will immediately trip and disconnect the circuit to protect the safety of the power system and the load line; conversely, if a normal circuit state is found during subsequent real-time detection, the circuit breaker device will remain in the closed state to ensure continuous power supply.

[0056] As an alternative implementation, in the embodiment of the present application, the control module can further manage the load line after closing according to the following steps: use a preset detection device to detect the circuit state of the load line in real time. Among them, the detection device includes but is not limited to: residual current transformers, current transformers, voltage transformers, etc.; when the circuit state is in a fault state, control the circuit breaker device to be in the open state; when the circuit state is in a normal state, control the circuit breaker device to be in the closed state.

[0057] That is to say, during the continuous power supply process on the load line, the control module can Figure 3 continuously monitor the circuit state on the load line according to the shown process and decide the opening and closing of the circuit breaker device connected to the load line according to the circuit state, where:

[0058] When a circuit fails at a certain moment, at this time, in order to protect the subsequent lines, the control module immediately performs an opening operation on the circuit breaker device and performs a pre-closing detection on the load line before the preset closing time. If the inspection is passed, the circuit breaker device is closed; otherwise, it continues to wait for the next pre-closing detection on the load line before the next closing time. It should be noted that if the pre-closing detection of the load line fails to pass the detection for multiple consecutive times (i.e., the set number of detections), it is considered that there is a serious fault in the load line. At this time, the circuit breaker device will no longer perform pre-closing detection and closing operations. In this case, it is necessary to manually confirm the line recovery and the reclosing switch reset before re-closing.

[0059] If the circuit does not fail at a certain moment, the control module continues to control the circuit breaker device to be in the closed state, continues to detect the circuit state of the load line in real time, and controls the opening and closing of the circuit breaker device according to the circuit state.

[0060] Optionally, the control module can use a residual current transformer to detect the residual current value of the load line in real time, wherein the two ends of the residual current transformer are respectively connected to the input live wire and the input neutral wire in the control circuit of the circuit breaker device; when the residual current value is greater than a preset first threshold value, it is determined that the load line is in a fault state and the abnormal type of the load line is a leakage fault; when the residual current value is not greater than the first threshold value, it is determined that the load line is in a normal state.

[0061] Specifically, Figure 3 is a schematic diagram of an optional leakage fault detection in an embodiment of the present application. Figure 3 As shown. The residual current transformer is inserted into the input line (i.e., the input neutral line and the input live line) to detect the residual current value, with the corresponding current signal; then the rectifier filter circuit is connected to shape the current signal, and the rectified signal is divided into two paths. One path is connected to the control module to collect the real-time leakage ADC (Analog-to-Digital Converter) signal value, and compared with the set threshold (such as 30mA). When the leakage ADC signal value exceeds the threshold, the trip operation is performed; the other path is connected to the comparator to compare with the set leakage value. If it exceeds the set leakage value, an interrupt signal is output to the interrupt input port of the control module, and the control module performs a trip operation. Both of the above methods can realize leakage protection for the load line.

[0062] Optionally, the control module can use a current transformer to detect the real-time current value of the load line in real time, wherein the current transformer is connected to the input live wire in the control circuit of the circuit breaker device; when the real-time current value is greater than a preset second threshold value, it is determined that the load line is in a fault state and the abnormal type of the load line is a short circuit fault; when the real-time current value is not greater than the second threshold value, it is determined that the load line is in a normal state.

[0063] Specifically, Figure 4 is a schematic diagram of an optional overcurrent fault detection in an embodiment of the present application, Figure 4 As shown. Use a current transformer to insert into the input live wire to detect the current to obtain the corresponding current signal; then connect to the rectifier filter circuit to shape the current signal, and the shaped signal is divided into two paths. One path is connected to the control module to collect the real-time current signal ADC value, and compare it with the set maximum current threshold (such as 10A). When the signal value exceeds the current threshold, the switch is disconnected; the other path is connected to the comparator to compare with the set large current value. If it exceeds the set value, an interrupt signal is output to the interrupt input port of the control module, and the control module performs a switch disconnection operation. Both of the above methods can realize overcurrent protection of the load line.

[0064] Optionally, the control module can use a voltage transformer to detect the real-time voltage value of the load line in real time, wherein the two ends of the voltage transformer are respectively connected to the input live wire and the input neutral wire in the control circuit of the circuit breaker device; when the real-time voltage value is higher than a preset high-voltage threshold value or the real-time voltage value is lower than a preset low-voltage threshold value, it is determined that the load line is in a fault state and the abnormal type of the load line is a high-voltage fault or a low-voltage fault; when the real-time voltage value is not higher than the high-voltage threshold value and the real-time voltage value is not lower than the low-voltage threshold value, it is determined that the load line is in a normal state.

[0065] Specifically, Figure 5 is a schematic diagram of an optional high and low voltage fault detection in an embodiment of the present application, Figure 5 As shown. The voltage transformer is inserted into the input line (i.e., the input neutral line and the input live line) to detect the voltage between the input lines and obtain the corresponding mutual inductance voltage signal; then the rectifier and filter circuit is connected to shape the mutual inductance voltage signal, and the shaped voltage signal ADC value is collected in the control module and compared with the set high-voltage threshold and low-voltage threshold. When the voltage signal ADC value is higher than the high-voltage threshold or the voltage signal ADC value is lower than the low-voltage threshold, the switch is opened to achieve high-voltage protection and low-voltage protection for the load line.

[0066] It should be noted that the control module can use one or more of the above-mentioned residual current transformer, current transformer, and voltage transformer to perform status detection on the load line. This application does not impose specific restrictions on the selection items and usage order of the detection equipment, which can be set according to the actual application scenario.

[0067] For example, Figure 6 is a flow chart of an optional line fault detection according to an embodiment of the present application, such as Figure 6 As shown. Among them:

[0068] Step 1: The control module detects the short-circuit state of the load line at the current moment (i.e., detects whether a short-circuit fault occurs in the load line). If the load line is not in a short-circuit state, the second step is executed; otherwise, the fourth step is executed;

[0069] Step 2: The control module continues to detect the leakage state of the load line at the current moment (i.e., detects whether a leakage fault occurs in the load line). If the load line is not in a leakage state, the third step is executed; otherwise, the fourth step is executed.

[0070] Step 3: The control module continues to detect the high and low voltage states of the load line at the current moment (i.e., detects whether the load line has a high and low voltage fault). If the load line is not in a high and low voltage state, the sixth step is executed; otherwise, the fourth step is executed.

[0071] Step 4: The control module determines whether the load line is in the above-mentioned fault state (i.e., short circuit state, leakage state, high or low voltage state) within the preset detection times. If so, the fifth step is executed; otherwise, the first step is continued:

[0072] Step 5: The control module determines that a permanent fault has occurred in the load line, and controls the circuit breaker device to no longer perform pre-closing detection and closing operations, and manually confirms whether the load line has recovered and resets the circuit breaker device before reclosing;

[0073] Step 6: The control module controls the circuit breaker device connected to the load line to be in a closed state (i.e., the circuit breaker device is closed);

[0074] Step 7: After closing the switch, the control module detects the short-circuit state of the load line after closing the switch, wherein, if the load line is not in the short-circuit state, the eighth step is executed; otherwise, the tenth step is executed;

[0075] Step 8: After closing the switch, the control module detects the leakage state of the load line after closing the switch, wherein, if the load line is not in the leakage state, the ninth step is executed; otherwise, the tenth step is executed;

[0076] Step 9: After closing the switch, the control module detects the high and low voltage states of the load line after closing the switch, wherein, if the load line is not in the high and low voltage states, the sixth step is executed; otherwise, the tenth step is executed;

[0077] Step 10: The control module controls the circuit breaker device connected to the load line to be in an open state (ie, performs an opening operation on the circuit breaker device).

[0078] Based on the scheme defined by the above steps S102 to S106, it can be known that in the embodiment, the control module detects the reference current value and the load current value in the control circuit of the circuit breaker device in the open state, and according to the magnitude relationship between the reference current value and the load current value, realizes the state detection of the load line before the circuit breaker device is closed, so as to avoid the instantaneous opening and closing of the circuit breaker due to the line fault, which affects the stability of the power system. In addition, when the circuit breaker device is closed, the circuit state of the load line is continuously detected to intelligently determine whether there is a fault in the load line, the type of fault (such as short circuit fault, leakage fault, high and low voltage fault, etc.) and the duration of the fault (instantaneous, permanent), so as to ensure the safe closing of the electrical switch of the load line in the absence of faults, and effectively avoid the occurrence of dangerous accidents. At the same time, even if the line fails when it is connected, the control module can automatically and quickly open the circuit breaker device to ensure the safety of the load line and effectively improve the stability and safety of the power system.

[0079] Example 2

[0080] Based on Embodiment 1 of the present application, an embodiment of a line fault detection device is also provided, and the line fault detection method of the above embodiment is executed when the device is running. Figure 7 is a schematic structural diagram of an optional line fault detection device according to an embodiment of the present application, such as Figure 7 As shown, the line fault detection device at least includes a detection module 72, a first control module 74 and a second control module 76, wherein:

[0081] A detection module 72, used for detecting a reference current value and a load current value in a control circuit of the circuit breaker device when the circuit breaker device connected to the load line is in an open state;

[0082] The first control module 74 is used to determine that there is a short circuit fault in the load line when the reference current value is not greater than the load current value, and control the circuit breaker device to continue to be in an open state;

[0083] The second control module 76 is used to control the circuit breaker device to be in a closed state when the reference current value is greater than the load current value, and to detect the circuit state of the load line in real time, and control the opening and closing of the circuit breaker device according to the circuit state.

[0084] It should be noted that the various modules in the above-mentioned line fault detection device can be program modules (for example, a set of program instructions that implement a certain specific function) or hardware modules. For the latter, it can be expressed in the following forms, but is not limited to this: the expression form of each of the above-mentioned modules is a processor, or the functions of each of the above-mentioned modules are implemented by a processor.

[0085] Example 3

[0086] According to an embodiment of the present application, a non-volatile storage medium is further provided, in which a program is stored, wherein when the program is running, the device where the non-volatile storage medium is located is controlled to execute the line fault detection method in Example 1.

[0087] Optionally, the device where the non-volatile storage medium is located implements the following steps by running the program: when the circuit breaker device connected to the load line is in an open state, detecting a reference current value and a load current value in a control circuit of the circuit breaker device; when the reference current value is not greater than the load current value, determining that a short circuit fault exists in the load line, and controlling the circuit breaker device to continue to be in an open state; when the reference current value is greater than the load current value, controlling the circuit breaker device to be in a closed state, detecting the circuit state of the load line in real time, and controlling the opening and closing of the circuit breaker device according to the circuit state.

[0088] According to an embodiment of the present application, a computer program product is further provided. The computer program product includes a stored computer program, wherein the line fault detection method in Embodiment 1 is implemented when the computer program is executed by a processor.

[0089] Optionally, the computer program executes the following steps: when a circuit breaker device connected to a load line is in an open state, detecting a reference current value and a load current value in a control circuit of the circuit breaker device; when the reference current value is not greater than the load current value, determining that a short circuit fault exists in the load line, and controlling the circuit breaker device to continue to be in an open state; when the reference current value is greater than the load current value, controlling the circuit breaker device to be in a closed state, detecting the circuit state of the load line in real time, and controlling the opening and closing of the circuit breaker device according to the circuit state.

[0090] According to an embodiment of the present application, a processor is further provided, which is used to run a program, wherein the line fault detection method in Example 1 is executed when the program is running.

[0091] Optionally, the following steps are executed when the program is running: when the circuit breaker device connected to the load line is in the open state, the reference current value and the load current value in the control circuit of the circuit breaker device are detected; when the reference current value is not greater than the load current value, it is determined that there is a short circuit fault in the load line, and the circuit breaker device is controlled to continue to be in the open state; when the reference current value is greater than the load current value, the circuit breaker device is controlled to be in the closed state, and the circuit state of the load line is detected in real time, and the opening and closing of the circuit breaker device is controlled according to the circuit state.

[0092] According to an embodiment of the present application, an electronic device is also provided, wherein the electronic device includes one or more processors; a memory for storing one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors are implemented to run the programs, wherein the program is configured to execute the line fault detection method in the above-mentioned embodiment 1 when running.

[0093] Optionally, the processor is configured to execute the following steps through a computer program: when a circuit breaker device connected to the load line is in an open state, detecting a reference current value and a load current value in a control circuit of the circuit breaker device; when the reference current value is not greater than the load current value, determining that a short circuit fault exists in the load line, and controlling the circuit breaker device to continue to be in an open state; when the reference current value is greater than the load current value, controlling the circuit breaker device to be in a closed state, detecting the circuit state of the load line in real time, and controlling the opening and closing of the circuit breaker device according to the circuit state.

[0094] As an optional implementation, the electronic device may be in the form of a mobile terminal, a computer terminal or a similar computing device. Figure 8 FIG. 1 shows a hardware structure block diagram of an electronic device for implementing a line fault detection method. Figure 8 As shown, the electronic device 80 may include one or more (802a, 802b, ..., 802n are used to illustrate) processors 802 (the processor 802 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory 804 for storing data, and a transmission device 806 for communication functions. In addition, it may also include: a display, an input / output interface (I / O interface), a universal serial bus (USB) port (which may be included as one of the ports of the BUS bus), a network interface, a power supply and / or a camera. It can be understood by those skilled in the art that Figure 8 The structure shown is only for illustration and does not limit the structure of the above electronic device. Figure 8 More or fewer components as shown, or with Figure 8 Different configurations are shown.

[0095] It should be noted that the one or more processors 802 and / or other data processing circuits described above may generally be referred to herein as "data processing circuits". The data processing circuits may be embodied in whole or in part as software, hardware, firmware, or any other combination thereof. In addition, the data processing circuit may be a single independent processing module, or may be incorporated in whole or in part into any of the other components in the electronic device 80. As described in the embodiments of the present application, the data processing circuit acts as a processor control (e.g., selection of a variable resistor terminal path connected to an interface).

[0096] The memory 804 can be used to store software programs and modules of application software, such as the program instructions / data storage device corresponding to the line fault detection method in the embodiment of the present application. The processor 802 executes various functional applications and data processing by running the software programs and modules stored in the memory 804, that is, to implement the vulnerability detection method of the above-mentioned application. The memory 804 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 804 may further include a memory remotely arranged relative to the processor 802, and these remote memories may be connected to the electronic device 80 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0097] The transmission device 806 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the electronic device 80. In one example, the transmission device 806 includes a network adapter (Network Interface Controller, NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 806 can be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0098] The display may be, for example, a touch screen liquid crystal display (LCD) that enables a user to interact with a user interface of the electronic device 80 .

[0099] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0100] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0101] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0102] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed over multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0103] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0104] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the relevant technology or all or part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of each embodiment method of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc. Various media that can store program codes.

[0105] The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A line fault detection method, characterized in that: include: When a circuit breaker device connected to the load line is in an open state, detecting a reference current value and a load current value in a control circuit of the circuit breaker device; When the reference current value is not greater than the load current value, determining that a short circuit fault exists in the load line, and controlling the circuit breaker device to continue to be in an open state; When the reference current value is greater than the load current value, the circuit breaker device is controlled to be in a closed state, and the circuit state of the load line is detected in real time, and the opening and closing of the circuit breaker device is controlled according to the circuit state.

2. The method according to claim 1, characterized in that The control circuit of the circuit breaker device includes: a first circuit and a second circuit, wherein the first circuit includes an input live wire, a first resistor, a first relay, a first diode, an optical coupler, a second relay and an input neutral wire connected in sequence, and the second circuit includes the input live wire, the first resistor, the first relay, a second diode, a third diode, a second resistor, a third relay, a third resistor, a load neutral wire, and an input neutral wire connected in sequence, wherein: The reference current value is the current value flowing through the first loop when the second loop is not conducting; The load current value is a current value flowing through the first loop when the second loop is turned on.

3. The method according to claim 2, characterized in that The control loop of the circuit breaker device further includes: a fourth relay disposed between the input live wire and the load live wire, and a fifth relay disposed between the input neutral wire and the load neutral wire, wherein: Controlling the circuit breaker device to continue to be in the open state, comprising: controlling the third relay and the fourth relay to be turned on, so that the circuit breaker device continues to be in the open state; Controlling the circuit breaker device to be in a closed state includes: controlling the third relay and the fourth relay to close, so that the circuit breaker device is in a closed state.

4. The method according to claim 1, characterized in that: Real-time detection of the circuit state of the load line and control of the opening and closing of the circuit breaker device according to the circuit state include: Using a preset detection device to detect the circuit state of the load line in real time, wherein the detection device includes at least one of the following: a residual current transformer, a current transformer, and a voltage transformer, and the circuit state includes: a normal state or a fault state; When the circuit state is in the fault state, controlling the circuit breaker device to be in an open state; When the circuit state is in the normal state, the circuit breaker device is controlled to be in a closed state.

5. The method according to claim 4, characterized in that Using a preset detection device to detect the circuit state of the load line in real time includes: The residual current transformer is used to detect the residual current value of the load line in real time, wherein two ends of the residual current transformer are respectively connected to the input live wire and the input neutral wire in the control circuit of the circuit breaker device; In a case where the residual current value is greater than a preset first threshold value, determining that the load line is in the fault state and the abnormal type of the load line is a leakage fault; When the residual current value is not greater than the first threshold value, it is determined that the load line is in the normal state.

6. The method according to claim 4, characterized in that Using a preset detection device to detect the circuit state of the load line in real time includes: Utilizing the current transformer to detect the real-time current value of the load line in real time, wherein the current transformer is connected to the input live wire in the control circuit of the circuit breaker device; In the case where the real-time current value is greater than a preset second threshold value, determining that the load line is in the fault state and the abnormal type of the load line is a short circuit fault; When the real-time current value is not greater than the second threshold value, it is determined that the load line is in the normal state.

7. The method according to claim 4, characterized in that Using a preset detection device to detect the circuit state of the load line in real time includes: The voltage transformer is used to detect the real-time voltage value of the load line in real time, wherein two ends of the voltage transformer are respectively connected to the input live wire and the input neutral wire in the control circuit of the circuit breaker device; When the real-time voltage value is higher than a preset high-voltage threshold value or the real-time voltage value is lower than a preset low-voltage threshold value, it is determined that the load line is in the fault state and the abnormal type of the load line is a high-voltage fault or a low-voltage fault; When the real-time voltage value is not higher than the high voltage threshold value and the real-time voltage value is not lower than the low voltage threshold value, it is determined that the load line is in the normal state.

8. A line fault detection device, characterized in that: include: A detection module, used for detecting a reference current value and a load current value in a control circuit of a circuit breaker device connected to a load line when the circuit breaker device is in an open state; A first control module, configured to determine that a short circuit fault exists in the load line when the reference current value is not greater than the load current value, and to control the circuit breaker device to continue to be in an open state; The second control module is used to control the circuit breaker device to be in a closed state when the reference current value is greater than the load current value, and to detect the circuit state of the load line in real time, and control the opening and closing of the circuit breaker device according to the circuit state.

9. A non-volatile storage medium, characterized in that: The non-volatile storage medium stores a computer program, wherein the device where the non-volatile storage medium is located executes the line fault detection method according to any one of claims 1 to 7 by running the computer program.

10. An electronic device, characterized in that: include: A memory and a processor, wherein the processor is used to run a program stored in the memory, wherein the line fault detection method according to any one of claims 1 to 7 is executed when the program is run.

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