Fault detection module and method of air circuit breaker and electrical equipment

Abstract

The invention provides a fault detection module and method of an air circuit breaker and electrical equipment. The module comprises a detection port, a first diode, a first isolation unit and a processing module, the detection port comprises a first access pin and a second access pin and is used for connecting any two phases of the output end of the air circuit breaker; the anode of the first diode is connected with the first access pin of the detection port, and the cathode of the first diode is connected with the anode input end of the first isolation unit; a second access pin of the detection port is connected with a negative electrode input end of the first isolation unit, and an output end of the first isolation unit is connected with the processing module; the processing module is used for judging whether the air circuit breaker breaks down or not based on the signal sent by the first isolation unit. According to the fault detection module, real-time fault detection of the air circuit breaker can be realized only through the isolator and the diode, so that the fault detection cost of the air circuit breaker is reduced on the premise of ensuring the fault detection accuracy of the air circuit breaker.

Description

Technical Field

[0001] The present invention relates to the technical field of air circuit breakers, and in particular to a fault detection module, method and electrical equipment for an air circuit breaker. Background Art

[0002] Air Circuit Breaker (ACB) is a protective device used in power systems. Its main function is to protect electrical equipment from faults such as overload, short circuit and undervoltage by cutting off the circuit.

[0003] At present, the fault detection method for the fuses at both ends of the battery is usually: using the auxiliary contacts of the air circuit breaker to lead the output signal of the air circuit breaker to the signal light on the panel for fault indication. However, due to the high cost of the device, this method is currently only used in large air circuit breakers. Summary of the invention

[0004] The embodiments of the present invention provide a fault detection module, method and electrical equipment for an air circuit breaker to solve the problem of high fault detection cost for an air circuit breaker.

[0005] In a first aspect, an embodiment of the present invention provides a fault detection module for an air circuit breaker, comprising: a detection port, a first diode, a first isolation unit, and a processing module;

[0006] The detection port includes a first access pin and a second access pin, which are used to connect any two phases of the output end of the air circuit breaker; the positive electrode of the first diode is connected to the first access pin of the detection port, and the negative electrode of the first diode is connected to the positive input end of the first isolation unit; the second access pin of the detection port is connected to the negative input end of the first isolation unit, and the output end of the first isolation unit is connected to the processing module;

[0007] The processing module is used to determine whether the air circuit breaker fails based on the signal sent by the first isolation unit.

[0008] In a second aspect, an embodiment of the present invention provides a fault detection method for an air circuit breaker, which is applied to the fault detection module of the air circuit breaker as described in the first aspect above, and the method includes:

[0009] Acquire a signal sent by the first isolation unit and a mains power signal;

[0010] If the mains signal is normal and it is detected that the signal sent by the first isolation unit is a pulse signal, it is determined that the air circuit breaker is normal;

[0011] If the mains power signal is normal and it is detected that the signal sent by the first isolation unit is not a pulse signal, it is determined that the air circuit breaker fails.

[0012] In a third aspect, an embodiment of the present invention provides an electrical device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the method described in any possible implementation of the first aspect are implemented.

[0013] The embodiment of the present invention provides a fault detection module, method and electrical equipment for an air circuit breaker, the module comprising: a detection port, a first diode, a first isolation unit and a processing module; the detection port comprises a first access pin and a second access pin, which are used to connect any two phases of the output end of the air circuit breaker; the positive electrode of the first diode is connected to the first access pin of the detection port, and the negative electrode of the first diode is connected to the positive input end of the first isolation unit; the second access pin of the detection port is connected to the negative input end of the first isolation unit, and the output end of the first isolation unit is connected to the processing module; the processing module is used to determine whether the air circuit breaker has a fault based on the signal sent by the first isolation unit. The above-mentioned fault detection module can realize real-time fault detection of the air circuit breaker through the isolator and the diode, thereby reducing the cost of air circuit breaker fault detection while ensuring the accuracy of air circuit breaker fault detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 is a structural schematic diagram of a fault detection module of an air circuit breaker provided in an embodiment of the present invention;

[0016] Figure 2 1 is a circuit diagram of a fault detection module of an air circuit breaker provided in an embodiment of the present invention;

[0017] Figure 3 is a flow chart of an implementation of a fault detection method for an air circuit breaker provided by an embodiment of the present invention;

[0018] Figure 4 Schematic diagram of an electrical device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0021] In the prior art, the auxiliary contacts of the air switch are usually used for fault detection of large air circuit breakers. Specifically, the auxiliary contacts are used to synchronously output the opening and closing signals of the air circuit breaker. Installed inside the auxiliary contacts is a micro switch, and three connectors are led out with wires: F11, F12, and F14. When the air circuit breaker is in the open state, F11 and F12 are connected, and when the air circuit breaker is in the closed state, F11 and F14 are connected. The auxiliary contacts can connect the output signal to the signal light on the panel to indicate the opening and closing state of the switch.

[0022] The above method of detecting air circuit breaker faults through auxiliary contacts is relatively costly and is usually only applied to large air circuit breakers. In order to solve the problem of high cost of air circuit breaker fault detection, this embodiment provides an air circuit breaker fault detection module.

[0023] See also Figure 1 , which shows a schematic structural diagram of a fault detection module of an air circuit breaker provided in an embodiment of the present invention, including: a detection port CN1, a first diode D5, a first isolation unit 10 and a processing module 20;

[0024] The detection port CN1 includes a first access pin and a second access pin, which are used to connect any two phases of the output end of the air circuit breaker; the positive electrode of the first diode D5 is connected to the first access pin of the detection port CN1, and the negative electrode of the first diode D5 is connected to the positive input end of the first isolation unit 10; the second access pin of the detection port CN1 is connected to the negative input end of the first isolation unit 10, and the output end of the first isolation unit 10 is connected to the processing module 20;

[0025] The processing module 20 is used to determine whether the air circuit breaker fails based on the signal sent by the first isolation unit 10.

[0026] In this embodiment, when the first access pin of the detection port CN1 is connected to the output phase A of the air circuit breaker and the second access pin is connected to the output phase B of the air circuit breaker, if the air circuit breaker is normal, a positive and negative pulse signal will be output between the output phases AB of the air circuit breaker. When the voltage signal between the output phases AB of the air circuit breaker is positive, the first diode D5 is turned on, and the first isolation unit 10 isolates the signal and sends the high-level signal to the processing module 20. When the voltage signal between the output phases AB of the air circuit breaker is negative, the first diode D5 is turned off, and the first isolation unit 10 isolates the signal and sends the low-level signal to the processing module 20. The processing module 20 receives a pulse signal with a fixed frequency.

[0027] When the air circuit breaker fails, for example, the air circuit breaker trips during normal operation, there is no voltage between the AB phases of the air circuit breaker, a low-level signal is output, the first diode D5 is turned on, and the first isolation unit 10 isolates the signal and sends the low-level signal to the processing module 20, and the processing module 20 receives a continuous high-level signal. As another embodiment, the first isolation unit 10 may also output a low-level signal to the processing module 20 after receiving the low-level signal. When the processing module 20 detects a continuous high-level signal or a low-level signal during the normal operation of the air circuit breaker, it is determined that the air circuit breaker fails.

[0028] In this embodiment, the first isolation unit 10 may be a pulse transformer isolation circuit, a relay isolation circuit, or the like.

[0029] It can be seen from the above embodiments that the processing module 20 provided in this embodiment can determine whether the air circuit breaker fails based on the signal characteristics sent by the first isolation unit 10, thereby realizing real-time fault detection of the air circuit breaker and improving the accuracy and convenience of air circuit breaker fault detection.

[0030] In one possible implementation, Figure 2 shows a circuit diagram of a fault detection module of an air circuit breaker, refer to Figure 2 , the first isolation unit 10 includes a first photocoupler IC1 and a second diode D1;

[0031] The positive input terminal of the first photocoupler IC1 is connected to the cathode of the first diode D5 and the cathode of the second diode D1 respectively; the negative input terminal of the first photocoupler IC1 is connected to the anode of the second diode D1 and the second access pin of the detection port CN1 respectively; the positive output terminal of the first photocoupler IC1 is connected to the first pin of the first input terminal of the processing module 20; and the negative output terminal of the first photocoupler IC1 is connected to the second pin of the first input terminal of the processing module 20.

[0032] In one possible implementation, reference Figure 2 , the first isolation unit 10 further includes a third diode D9 and an output resistor R18;

[0033] The anode of the third diode D9 is connected to the cathode output terminal of the first photocoupler IC1, the cathode of the third diode D9 is connected to the anode output terminal of the first photocoupler IC1, and the anode output terminal of the first photocoupler IC1 is connected to the first input terminal first pin of the processing module 20 through the output resistor R18.

[0034] Specifically, the first photocoupler IC1 can be an external circuit photocoupler, which is composed of a light emitting diode and a phototransistor, and the anode of the light emitting diode is the positive input terminal of the first photocoupler IC1, and the cathode of the light emitting diode is the negative input terminal of the first photocoupler IC1; the collector of the phototransistor is the positive output terminal of the first photocoupler IC1, and the emitter of the phototransistor is the negative output terminal of the first photocoupler IC1.

[0035] Specifically, the positive output terminal of the first photocoupler IC1 is connected to the first pin of the first input terminal CN3 of the processing module 20 through the output resistor R18.

[0036] In a possible implementation manner, the fault detection module further includes a first resistance unit;

[0037] A first end of the first resistance unit is connected to the cathode of the first diode D5 , and a second end of the first resistance unit is connected to the input end of the first isolation unit 10 .

[0038] In this embodiment, the input voltage signal is divided by the first resistor unit so that the voltage signal input to the first photocoupler IC1 meets the device requirement.

[0039] Specifically, the first resistor unit may include a plurality of resistors connected in series.

[0040] In one possible implementation, reference Figure 2 , the first resistance unit includes a first resistor R6, a second resistor R10, a third resistor R5 and a fourth resistor R9;

[0041] The first end of the first resistor R6 and the first end of the second resistor R10 are respectively connected to the first end of the first resistor unit, the second end of the first resistor R6 is connected to the first end of the third resistor R5, the second end of the second resistor R10 is connected to the first end of the fourth resistor R9, and the second end of the third resistor R5 and the second end of the fourth resistor R9 are both connected to the second end of the first resistor unit.

[0042] In a possible implementation manner, the processing module 20 is specifically used to:

[0043] Based on the signal sent by the first isolation unit 10 and the mains signal, it is determined whether the air circuit breaker fails.

[0044] In a possible implementation, the fault detection module further includes an audible and visual alarm device;

[0045] The processing module 20 is further configured to generate a fault alarm signal when determining that the air circuit breaker fails, and send the fault alarm signal to the sound and light alarm device.

[0046] In this embodiment, when the processing module 20 detects a continuous high-level signal or a low-level signal, it outputs a high-level signal to the sound and light alarm device. The sound and light alarm device works at a high level and stops working at a low level, thereby reminding the user that the circuit breaker is faulty.

[0047] refer to Figure 3 , Figure 3 A schematic flow chart of a fault detection method for an air circuit breaker provided by an embodiment of the present invention is shown. The method is applied to the fault detection module of the air circuit breaker, and is described in detail as follows:

[0048] S101: Acquire a signal sent by a first isolation unit and a mains power signal;

[0049] S102: If the mains power signal is normal and it is detected that the signal sent by the first isolation unit is a pulse signal, it is determined that the air circuit breaker is normal;

[0050] S103: If the mains power signal is normal and it is detected that the signal sent by the first isolation unit is not a pulse signal, it is determined that the air circuit breaker fails.

[0051] In this embodiment, the processor obtains the AC power signal. If the AC power signal is not faulty, that is, no undervoltage, overload, short circuit or other faults occur, it is determined whether the air circuit breaker is faulty. If the signal sent by the first isolation unit is a pulse signal of a fixed frequency, the air circuit breaker is determined to be normal. If the signal sent by the first isolation unit is a continuous high-level signal or a low-level signal, it is determined that the air circuit breaker has been disconnected, that is, a fault has occurred.

[0052] If a fault has occurred in the power grid, no fault detection is performed on the air circuit breaker.

[0053] It can be seen from the above embodiments that this embodiment can accurately determine whether an air circuit breaker fails based on signal characteristics through the fault detection module, and the components required in the fault detection module are low in cost and have wider adaptability.

[0054] In one embodiment, the fault detection module of the air circuit breaker also includes a remote electrical device and a remote communication module; the processor is electrically connected to the remote electrical device through the remote communication module, and sends an air circuit breaker fault alarm signal to the remote electrical device. A three-dimensional model of the power system is constructed in the remote electrical device. The air circuit breaker fault alarm signal is used to highlight the faulty air circuit breaker in the three-dimensional model of the power system, and based on the identity information and corresponding location information of the air circuit breaker stored in the remote electrical device, the location of the faulty air circuit breaker is displayed, so as to facilitate the staff to quickly locate the faulty air circuit breaker and improve the fault detection and resolution efficiency of the air circuit breaker.

[0055] In this embodiment, the power system may be a system connected to the mains, such as an energy storage system, a photovoltaic system, and a power generator set.

[0056] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0057] The following is an embodiment of the device of the present invention. For details not described in detail therein, reference may be made to the corresponding method embodiment described above.

[0058] The embodiment of the present invention provides a fault detection device for an air circuit breaker. For ease of description, only the parts related to the embodiment of the present invention are shown, which are described in detail as follows:

[0059] The fault detection device of the air circuit breaker includes:

[0060] A signal acquisition module, used to acquire the signal sent by the first isolation unit and the mains signal;

[0061] A first judgment module, configured to judge that the air circuit breaker is normal if the mains signal is normal and the signal sent by the first isolation unit is detected to be a pulse signal;

[0062] The second judgment module is used to determine that the air circuit breaker fails if the mains signal is normal and it is detected that the signal sent by the first isolation unit is not a pulse signal.

[0063] It can be seen from the above embodiments that the fault detection device for air circuit breaker provided in this embodiment can accurately determine whether the air circuit breaker has a fault based on signal characteristics through the fault detection module, and the components required in the fault detection module are low in cost and have wider adaptability.

[0064] Figure 4 Schematic diagram of an electrical device provided by an embodiment of the present invention. Figure 4 As shown, the electrical device 4 of this embodiment includes: a processor 40 and a memory 41. The memory 41 is used to store a computer program 42, and the processor 40 is used to call and run the computer program 42 stored in the memory 41 to perform the steps in the above-mentioned various air circuit breaker fault detection method embodiments, such as Figure 3 Alternatively, the processor 40 is used to call and run the computer program 42 stored in the memory 41 to implement the functions of each module / unit in the above-mentioned device embodiments.

[0065] Exemplarily, the computer program 42 may be divided into one or more modules / units, which are stored in the memory 41 and executed by the processor 40 to implement the present invention. The one or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, which are used to describe the execution process of the computer program 42 in the electrical device 4.

[0066] The electrical device 4 may include, but is not limited to, a processor 40 and a memory 41. Those skilled in the art will appreciate that Figure 4 It is only an example of the electrical device 4 and does not constitute a limitation of the electrical device 4. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components. For example, the electrical device may also include input and output devices, network access devices, buses, etc.

[0067] The processor 40 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0068] The memory 41 may be an internal storage unit of the electrical device 4, such as a hard disk or memory of the electrical device 4. The memory 41 may also be an external storage device of the electrical device 4, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. equipped on the electrical device 4. Further, the memory 41 may also include both an internal storage unit and an external storage device of the electrical device 4. The memory 41 is used to store the computer program and other programs and data required by the electrical device. The memory 41 may also be used to temporarily store data that has been output or is to be output.

[0069] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0070] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0071] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0072] In the embodiments provided by the present invention, it should be understood that the disclosed devices / electrical equipment and methods can be implemented in other ways. For example, the device / electrical equipment embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as 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 devices or units, which can be electrical, mechanical or other forms.

[0073] 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 on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0074] In addition, each functional unit in each embodiment of the present invention 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.

[0075] If the integrated module / 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 present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned air circuit breaker fault detection method embodiments can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practices in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practices, computer-readable media does not include electrical carrier signals and telecommunication signals.

[0076] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A fault detection module for an air circuit breaker, characterized in that: include: A detection port, a first diode, a first isolation unit and a processing module; The detection port includes a first access pin and a second access pin, which are used to connect any two phases of the output end of the air circuit breaker; the positive electrode of the first diode is connected to the first access pin of the detection port, and the negative electrode of the first diode is connected to the positive input end of the first isolation unit; the second access pin of the detection port is connected to the negative input end of the first isolation unit, and the output end of the first isolation unit is connected to the processing module; The processing module is used to determine whether the air circuit breaker fails based on the signal sent by the first isolation unit.

2. The fault detection module for air circuit breaker according to claim 1, characterized in that: The first isolation unit includes a first photocoupler and a second diode; The positive input end of the first photocoupler is connected to the negative electrode of the first diode and the negative electrode of the second diode respectively; the negative input end of the first photocoupler is connected to the positive electrode of the second diode and the second access pin of the detection port respectively; the positive output end of the first photocoupler is connected to the first pin of the first input end of the processing module; and the negative output end of the first photocoupler is connected to the second pin of the first input end of the processing module.

3. The fault detection module for air circuit breaker according to claim 2, characterized in that: The first isolation unit further includes a third diode and an output resistor; The anode of the third diode is connected to the cathode output terminal of the first photocoupler, the cathode of the third diode is connected to the cathode output terminal of the first photocoupler, and the cathode output terminal of the first photocoupler is connected to the first input terminal first pin of the processing module through the output resistor.

4. The fault detection module for air circuit breaker according to claim 1, characterized in that: The fault detection module also includes a first resistance unit; A first end of the first resistance unit is connected to the cathode of the first diode, and a second end of the first resistance unit is connected to the anode input end of the first isolation unit.

5. The fault detection module for air circuit breaker according to claim 4, characterized in that: The first resistor unit includes a first resistor, a second resistor, a third resistor and a fourth resistor; The first end of the first resistor and the first end of the second resistor are respectively connected to the first end of the first resistor unit, the second end of the first resistor is connected to the first end of the third resistor, the second end of the second resistor is connected to the first end of the fourth resistor, and the second end of the third resistor and the second end of the fourth resistor are both connected to the second end of the first resistor unit.

6. The fault detection module for air circuit breaker according to claim 1, characterized in that: The processing module is specifically used for: Based on the signal sent by the first isolation unit and the mains signal, it is determined whether the air circuit breaker fails.

7. The fault detection module for air circuit breaker according to claim 1, characterized in that: The fault detection module also includes an audible and visual alarm device; The processing module is also used to generate a fault alarm signal when it is determined that the air circuit breaker fails, and send the fault alarm signal to the sound and light alarm device.

8. A method for detecting a fault of an air circuit breaker, characterized in that: A fault detection module for an air circuit breaker according to any one of claims 1 to 7, the method comprising: Acquire a signal sent by the first isolation unit and a mains power signal; If the mains signal is normal and it is detected that the signal sent by the first isolation unit is a pulse signal, it is determined that the air circuit breaker is normal; If the mains power signal is normal and it is detected that the signal sent by the first isolation unit is not a pulse signal, it is determined that the air circuit breaker fails.

9. An electrical device, characterized in that: It comprises a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the fault detection method for an air circuit breaker as claimed in claim 8.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the fault detection method for an air circuit breaker as claimed in claim 8 are implemented.

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