Fault detection module, method and electrical device for air circuit breaker

Abstract

The application provides a fault detection module, method and electrical equipment of 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, and is used for connecting any two phases of an output end of the air circuit breaker; a positive electrode of the first diode is connected with the first access pin of the detection port, and a negative electrode of the first diode is connected with a positive electrode input end of the first isolation unit; the 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; and the processing module is used for judging whether the air circuit breaker has a fault based on a 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 only an isolator and a diode, thereby reducing the cost of fault detection of the air circuit breaker under the premise of ensuring the accuracy of fault detection of the air circuit breaker.

Description

Technical Field

[0001] This invention relates to the field of air circuit breaker technology, and in particular to a fault detection module, method and electrical equipment for an air circuit breaker. Background Technology

[0002] An 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 disconnecting the circuit.

[0003] Currently, the common method for detecting faults in the fuses at both ends of a battery is to use the auxiliary contacts of the air circuit breaker to lead the output signal of the air circuit breaker to the indicator light on the panel for fault indication. However, due to the high cost of the components, this method is currently only used in large air circuit breakers. Summary of the Invention

[0004] This invention provides a fault detection module, method, and electrical equipment for air circuit breakers to solve the problem of high cost of fault detection for air circuit breakers.

[0005] In a first aspect, embodiments of the present invention provide 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, used to connect any two phases of the air circuit breaker output; the positive terminal of the first diode is connected to the first access pin of the detection port, and the negative terminal of the first diode is connected to the positive input terminal of the first isolation unit; the second access pin of the detection port is connected to the negative input terminal of the first isolation unit, and the output terminal of the first isolation unit is connected to the processing module.

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

[0008] In a second aspect, embodiments of the present invention provide a fault detection method for an air circuit breaker, applied to the fault detection module of the air circuit breaker as described in the first aspect above, the method comprising:

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

[0010] If the mains power signal is normal and the signal sent by the first isolation unit is detected to be a pulse signal, then the air circuit breaker is determined to be normal.

[0011] If the mains power signal is normal and the signal sent by the first isolation unit is not a pulse signal, then the air circuit breaker is determined to be faulty.

[0012] Thirdly, embodiments of the present invention provide an electrical device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method as described in any possible implementation of the first aspect above.

[0013] This invention provides a fault detection module, method, and electrical device for an air circuit breaker. The module includes 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, used to connect any two phases of the air circuit breaker's output. The anode of the first diode is connected to the first access pin of the detection port, and the cathode of the first diode is connected to the positive input terminal of the first isolation unit. The second access pin of the detection port is connected to the negative input terminal of the first isolation unit, and the output terminal of the first isolation unit is connected to the processing module. The processing module is used to determine whether the air circuit breaker has malfunctioned based on the signal sent by the first isolation unit. This fault detection module enables real-time fault detection of the air circuit breaker through the isolator and diode, thereby reducing the cost of air circuit breaker fault detection while ensuring accuracy. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

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

[0017] Figure 3 This is a flowchart illustrating the implementation of the fault detection method for an air circuit breaker provided in this embodiment of the invention.

[0018] Figure 4 This is a schematic diagram of the electrical equipment provided in an embodiment of the present invention. Detailed Implementation

[0019] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0021] In existing technology, fault detection of large air circuit breakers typically utilizes the auxiliary contacts of the air switch. Specifically, the auxiliary contacts are used to synchronously output the open and close signals of the air circuit breaker. Installed inside the auxiliary contacts is a microswitch with three terminals led out by wires: F11, F12, and F14. When the air circuit breaker is in the open state, F11 and F12 are closed; when the air circuit breaker is in the closed state, F11 and F14 are closed. The auxiliary contacts can connect the output signal to the indicator lights on the panel to indicate the open / closed state of the switch.

[0022] The above-mentioned method for detecting air circuit breaker faults through auxiliary contacts is 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 Figure 1 The diagram shows a structural schematic of the fault detection module of the 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, used to connect any two phases of the output terminal of the air circuit breaker; the positive terminal of the first diode D5 is connected to the first access pin of the detection port CN1, and the negative terminal of the first diode D5 is connected to the positive input terminal of the first isolation unit 10; the second access pin of the detection port CN1 is connected to the negative input terminal of the first isolation unit 10, and the output terminal 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 has malfunctioned 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 A and B of the air circuit breaker. When the voltage signal between the output phases A and B 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 a high-level signal to the processing module 20. When the voltage signal between the output phases A and B 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 a low-level signal to the processing module 20. The processing module 20 will receive a pulse signal of a fixed frequency.

[0027] When an air circuit breaker malfunctions, for example, if it trips during normal operation, there is no voltage between phases A and B, resulting in a low-level output signal. The first diode D5 conducts, and the first isolation unit 10 isolates the signal before sending the low-level signal to the processing module 20. The processing module 20 then receives a continuous high-level signal. Alternatively, the first isolation unit 10 can also output a low-level signal to the processing module 20 after receiving the low-level signal. If the processing module 20 detects a continuous high-level or low-level signal during normal operation of the air circuit breaker, it determines that the air circuit breaker has malfunctioned.

[0028] In this embodiment, the first isolation unit 10 can be a pulse transformer isolation circuit, a relay isolation circuit, etc.

[0029] As can be seen from the above embodiments, the processing module 20 provided in this embodiment can determine whether the air circuit breaker has malfunctioned 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 fault detection of the air circuit breaker.

[0030] In one possible implementation, Figure 2 A circuit diagram of the fault detection module for an air circuit breaker is shown. (Refer to...) Figure 2 The first isolation unit 10 includes a first optocoupler IC1 and a second diode D1;

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

[0032] In one possible implementation, refer to Figure 2 The first isolation unit 10 also includes a third diode D9 and an output resistor R18;

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

[0034] Specifically, the first optocoupler IC1 can be an external circuit optocoupler, which consists of a light-emitting diode and a phototransistor. The positive terminal of the light-emitting diode is the positive input terminal of the first optocoupler IC1, and the negative terminal of the light-emitting diode is the negative input terminal of the first optocoupler IC1. The collector of the phototransistor is the positive output terminal of the first optocoupler IC1, and the emitter of the phototransistor is the negative output terminal of the first optocoupler IC1.

[0035] Specifically, the positive output terminal of the first optocoupler 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 one possible implementation, the fault detection module further includes a first resistor unit;

[0037] The first end of the first resistor unit is connected to the negative terminal of the first diode D5, and the second end of the first resistor unit is connected to the input terminal 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 optocoupler IC1 meets the device requirements.

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

[0040] In one possible implementation, refer to Figure 2 The first resistor 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. The second ends of the third resistor R5 and the second ends of the fourth resistor R9 are both connected to the second end of the first resistor unit.

[0042] In one possible implementation, the processing module 20 is specifically used for:

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

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

[0045] The processing module 20 is also used to generate a fault alarm signal when it is determined that the air circuit breaker has failed, and to send the fault alarm signal to the audible and visual 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 audible and visual alarm device. The audible and visual alarm device operates under a high level and stops operating under a low level, thereby reminding the user of a circuit breaker malfunction.

[0047] refer to Figure 3 , Figure 3 A flowchart illustrating a fault detection method for an air circuit breaker according to an embodiment of the present invention is shown. This method is applied to the fault detection module of the aforementioned air circuit breaker, and is described in detail below:

[0048] S101: Obtain the signal and mains power signal sent by the first isolation unit;

[0049] S102: If the mains power signal is normal and the signal sent by the first isolation unit is detected to be a pulse signal, then the air circuit breaker is determined to be normal.

[0050] S103: If the mains power signal is normal and the signal sent by the first isolation unit is not a pulse signal, then the air circuit breaker is determined to be faulty.

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

[0052] If a fault has already occurred in the power grid, the air circuit breaker will not be fault detected.

[0053] As can be seen from the above embodiments, this embodiment can accurately determine whether the air circuit breaker has failed based on signal characteristics through the fault detection module, and the components required in the fault detection module have low cost and wider applicability.

[0054] In one embodiment, the fault detection module for the air circuit breaker further 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. The remote electrical device contains a three-dimensional model of the power system. 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, displays the location of the faulty air circuit breaker, facilitating the quick location of the faulty air circuit breaker by staff and improving the efficiency of fault detection and resolution.

[0055] In this embodiment, the power system can be an energy storage system, a photovoltaic system, a power generation unit, or other system connected to the mains power grid.

[0056] It should be understood that the sequence number of each step in the above embodiments does not imply 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 embodiments of the present invention.

[0057] The following are device embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0058] This invention provides a fault detection device for air circuit breakers. For ease of explanation, only the parts related to this invention are shown, and are described in detail below:

[0059] The fault detection device for air circuit breakers includes:

[0060] The signal acquisition module is used to acquire the signals sent by the first isolation unit and the mains power signal;

[0061] The first judgment module is used to determine that the air circuit breaker is normal if the mains power 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 has malfunctioned if the mains power signal is normal and the signal sent by the first isolation unit is not a pulse signal.

[0063] As can be seen from the above embodiments, the fault detection device for air circuit breakers provided in this embodiment can accurately determine whether an air circuit breaker has malfunctioned based on signal characteristics through the fault detection module, and the components required in the fault detection module have lower costs and wider applicability.

[0064] Figure 4 This is a schematic diagram of the electrical equipment provided in an embodiment of the present invention. Figure 4 As shown, the electrical device 4 in this embodiment includes a processor 40 and a memory 41. The memory 41 stores a computer program 42, and the processor 40 calls and runs the computer program 42 stored in the memory 41 to execute the steps in the above embodiments of the fault detection method for various air circuit breakers, for example... Figure 3 The steps S101 to S103 are shown. 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-described device embodiments.

[0065] For example, 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 complete the present invention. The one or more modules / units may be a series of computer program instruction segments capable of performing a specific function, which 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 understand that... Figure 4 This is merely an example of electrical device 4 and does not constitute a limitation on electrical device 4. It may include more or fewer components than shown, or combine certain components, or different components. For example, the electrical device may also include input / 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 (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), 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.

[0068] The memory 41 can 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 can also be an external storage device of the electrical device 4, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc., equipped on the electrical device 4. Furthermore, the memory 41 can include both internal storage units and external storage devices 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 can also be used to temporarily store data that has been output or will be output.

[0069] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to 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 embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0070] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0071] Those skilled in the art will recognize that the units and algorithm steps of the various examples 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 implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0072] In the embodiments provided by this 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 merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0073] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0074] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0075] If the integrated module / unit is implemented as 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, all or part of the processes in the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the above-described air circuit breaker fault detection method embodiments. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content contained in the computer-readable medium may be appropriately added to or subtracted from the content as required by the legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium may not include electrical carrier signals and telecommunication signals.

[0076] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A fault detection module for an air circuit breaker, characterized in that, include: Detection port, first diode, first isolation unit, and processing module; The detection port includes a first access pin and a second access pin, used to connect any two phases of the air circuit breaker output; the positive terminal of the first diode is connected to the first access pin of the detection port, and the negative terminal of the first diode is connected to the positive input terminal of the first isolation unit; the second access pin of the detection port is connected to the negative input terminal of the first isolation unit, and the output terminal of the first isolation unit is connected to the processing module. The processing module is used to determine whether the air circuit breaker has malfunctioned based on the signal sent by the first isolation unit; The first isolation unit includes a first optocoupler and a second diode; The positive input terminal of the first optocoupler is connected to the negative terminal of the first diode and the negative terminal of the second diode, respectively; the negative input terminal of the first optocoupler is connected to the positive terminal of the second diode and the second access pin of the detection port, respectively; the positive output terminal of the first optocoupler is connected to the first pin of the first input terminal of the processing module; the negative output terminal of the first optocoupler is connected to the second pin of the first input terminal of the processing module. The first isolation unit also includes a third diode and an output resistor; The positive terminal of the third diode is connected to the negative output terminal of the first optocoupler, the negative terminal of the third diode is connected to the positive output terminal of the first optocoupler, and the positive output terminal of the first optocoupler is connected to the first pin of the first input terminal of the processing module through the output resistor. The fault detection module also includes a first resistor unit; The first end of the first resistor unit is connected to the negative terminal of the first diode, and the second end of the first resistor unit is connected to the positive input terminal of the first isolation unit. The processing module is specifically used for: Based on the signals sent by the first isolation unit and the mains power signal, it is determined whether the air circuit breaker has malfunctioned.

2. The fault detection module for an air circuit breaker according to claim 1, 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. The second ends of the third resistor and the fourth resistor are both connected to the second end of the first resistor unit.

3. The fault detection module for an 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 has failed, and to send the fault alarm signal to the audible and visual alarm device.

4. A fault detection method for an air circuit breaker, characterized in that, The method, applied to a fault detection module for an air circuit breaker as described in any one of claims 1 to 3, comprises: Acquire the signals sent by the first isolation unit and the mains power signal; If the mains power signal is normal and the signal sent by the first isolation unit is detected to be a pulse signal, then the air circuit breaker is determined to be normal. If the mains power signal is normal and the signal sent by the first isolation unit is not a pulse signal, then the air circuit breaker is determined to be faulty.

5. An electrical device, characterized in that, It includes a processor and a memory, the memory being used to store computer programs, and the processor being used to call and run the computer programs stored in the memory to execute the fault detection method for an air circuit breaker as described in claim 4.

6. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the fault detection method for the air circuit breaker as described in claim 4 above.

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