Method and apparatus for failure diagnosis of switching device

Abstract

The application discloses a kind of failure diagnosis method and device of switching device.Therein, the method includes: based on the control loop of switching device is divided to the multiple functions of switching device, obtain multiple functional areas;Pre-set pulse signal wave is applied to switching device, and the working state of functional area is sequentially obtained according to the area position of multiple functional areas;Based on the working state of multiple functional areas, output diagnosis result.The application solves the technical problem of poor diagnosis effect in related art for diagnosing the failure of switching device.

Description

Fault diagnosis methods and devices for switching devices Technical Field

[0001] This invention relates to the field of high voltage testing, and more specifically, to a method and apparatus for fault diagnosis of switching devices. Background Technology

[0002] Switches with mechanical control circuits and electrical control circuits, such as high-voltage disconnect switches, play an important role in substation electrical systems. However, because these switching devices operate under high voltage, high current, and harsh outdoor environments for extended periods, they are prone to overheating and mechanical failures, resulting in a high failure rate. This seriously threatens the safe and stable operation of the power grid. Currently, there is a lack of effective detection and operation maintenance methods to monitor and diagnose these switching devices.

[0003] There is currently no effective solution to the above problems. Summary of the Invention

[0004] This invention provides a method and apparatus for fault diagnosis of switching devices, which at least solves the technical problem of poor diagnostic effect in fault diagnosis of switching devices in related technologies.

[0005] According to one aspect of the present invention, a fault diagnosis method for a switching device is provided, comprising: dividing the control circuit of the switching device based on multiple functions of the switching device to obtain multiple functional regions, wherein the control circuit includes at least a mechanical control circuit and an electrical control circuit, and the functional regions are used to characterize the circuit regions in the control circuit used to realize the corresponding functions; applying a preset pulse signal wave to the switching device, and sequentially acquiring the working state of the functional regions according to the regional positions of the multiple functional regions; and outputting a diagnostic result based on the working state of the multiple functional regions, wherein the diagnostic result is used to characterize whether the switching device has a fault.

[0006] Optionally, the functional area includes at least: a signal receiving area, a transmission control area, an operating mechanism area, and an electrical interlocking area, wherein the preset pulse signal wave passes through the functional area in the following order: signal receiving area, transmission control area, operating mechanism area, and electrical interlocking area.

[0007] Optionally, the operating states of the functional areas are obtained sequentially according to their regional locations, including: in response to the signal receiving area receiving a preset pulse signal wave, obtaining a first operating state of the signal receiving area, wherein the first operating state is used to characterize whether the switching device performs a preset action, and the preset action is determined by the type of the preset pulse signal wave; in response to the transmission control area receiving a preset pulse signal wave, obtaining a second operating state of the switching device, wherein the second operating state is used to characterize whether the opening and closing of the switching device is in a preset position, and the preset position is determined by the type of the preset pulse signal wave; in response to the operating mechanism area receiving a preset pulse signal wave, obtaining a third operating state of the switching device, wherein the third operating state is used to characterize whether the switching device initiates the opening and closing action; and in response to the electrical interlock area receiving a preset pulse signal wave, obtaining a fourth operating state of the switching device, wherein the fourth operating state is used to characterize whether the switching device operates according to a preset circuit logic.

[0008] Optionally, in response to receiving a preset pulse signal wave in the operating mechanism area, a third operating state of the switching device is obtained, including: performing an operation simulation on the switching device based on multiple preset voltages to obtain multiple third operating states of the switching device.

[0009] Optionally, the method further includes: in response to multiple third operating states where the switching device initiates opening and closing actions and the switching device does not pause during the operation, determining that the operating mechanism area is normal; in response to any one of the multiple third operating states where the switching device does not initiate opening and closing actions, or the switching device pauses during the operation, determining that the operating mechanism area is abnormal.

[0010] Optionally, the method further includes: determining that the signal receiving area is normal in response to the first operating state of the switching device performing an operating action; and determining that the signal receiving area is abnormal in response to the first operating state of the switching device not performing an operating action.

[0011] Optionally, the method further includes: determining that the transmission control area is normal in response to the second operating state being that the opening or closing is in a preset position; and determining that the transmission control area is abnormal in response to the second operating state being that the opening or closing is not in a preset position.

[0012] Optionally, the method further includes: determining that the electrical interlocking area is normal in response to the fourth operating state where the switching device operates according to the preset circuit logic; and determining that the electrical interlocking area is abnormal in response to the fourth operating state where the switching device does not operate according to the preset circuit logic.

[0013] Optionally, based on the operating status of multiple functional regions, a diagnostic result is output, including: in response to the normal operating status of multiple functional regions, a normal diagnostic result is output, wherein the normal diagnostic result is used to characterize the switching device as normal; in response to the abnormal operating status of any one of the multiple functional regions, a fault diagnostic result is output, wherein the fault diagnostic result includes at least the information corresponding to any one functional region.

[0014] According to another aspect of the present invention, a fault diagnosis device is also provided, comprising: a region division module, used to divide the control loop of the switching device based on multiple functions of the switching device to obtain multiple functional regions, wherein the control loop includes at least a mechanical control loop and an electrical control loop, and the functional regions are used to characterize the loop regions in the control loop used to realize the corresponding functions; a state acquisition module, used to apply a preset pulse signal wave to the switching device and sequentially acquire the working state of the functional regions according to the regional positions of the multiple functional regions; and a result output module, used to output fault diagnosis results based on the working states of the multiple functional regions.

[0015] Optionally, the functional area includes at least: a signal receiving area, a transmission control area, an operating mechanism area, and an electrical interlocking area, wherein the preset pulse signal wave passes through the functional area in the following order: signal receiving area, transmission control area, operating mechanism area, and electrical interlocking area.

[0016] Optionally, the status acquisition module includes: a first acquisition unit, configured to acquire a first operating state of the signal receiving area in response to receiving a preset pulse signal wave in the signal receiving area, wherein the first operating state is used to characterize whether the switching device performs a preset action, and the preset action is determined by the type of the preset pulse signal wave; a second acquisition unit, configured to acquire a second operating state of the switching device in response to receiving a preset pulse signal wave in the transmission control area, wherein the second operating state is used to characterize whether the opening and closing of the switching device is in a preset position, and the preset position is determined by the type of the preset pulse signal wave; a third acquisition unit, configured to acquire a third operating state of the switching device in response to receiving a preset pulse signal wave in the operating mechanism area, wherein the third operating state is used to characterize whether the switching device initiates the opening and closing action; and a fourth acquisition unit, configured to acquire a fourth operating state of the switching device in response to receiving a preset pulse signal wave in the electrical interlock area, wherein the fourth operating state is used to characterize whether the switching device operates according to a preset circuit logic.

[0017] Optionally, the third acquisition unit is also used to: perform operational simulation of the switching device based on multiple preset voltages, and acquire multiple third operating states of the switching device.

[0018] Optionally, the device further includes: a first determining module, used to determine that the operating mechanism area is normal in response to multiple third operating states in which the switching device initiates opening and closing actions, and the switching device does not pause during the operation; and a second determining module, used to determine that the operating mechanism area is abnormal in response to any one of the multiple third operating states in which the switching device does not initiate opening and closing actions, or the switching device pauses during the operation.

[0019] Optionally, the device further includes: a third determining module, configured to determine that the signal receiving area is normal in response to the first operating state being that the switching device performs an operating action; and a fourth determining module, configured to determine that the signal receiving area is abnormal in response to the first operating state being that the switching device does not perform an operating action.

[0020] Optionally, the device further includes: a fifth determining module, used to determine that the transmission control area is normal in response to the second operating state being that the opening and closing are in the preset position; and a sixth determining module, used to determine that the transmission control area is abnormal in response to the second operating state being that the opening and closing are not in the preset position.

[0021] Optionally, the result output module includes: a first output module, used to output a normal diagnostic result in response to the normal operating status of multiple functional areas, wherein the normal diagnostic result is used to characterize the switching device as normal; and a second output module, used to output a fault diagnostic result in response to the abnormal operating status of any one of the multiple functional areas, wherein the fault diagnostic result includes at least the information corresponding to any one functional area.

[0022] According to another aspect of the present invention, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein, when the program is running, it controls the device where the computer-readable storage medium is located to execute the fault diagnosis method of the above-described method embodiments.

[0023] According to another aspect of the present invention, a processor is also provided, which is used to run a program, wherein the program executes the fault diagnosis method of the above-described method embodiments.

[0024] In this embodiment of the invention, the control circuit of the switching device is divided into multiple functional regions based on the multiple functions of the switching device. A preset pulse signal wave is applied to the switching device, and the working state of the functional regions is obtained sequentially according to their regional positions. Based on the working state of the multiple functional regions, diagnostic results are output. By dividing the control circuit of the switching device into regions, fault diagnosis is performed on each functional region in sequence according to the working order of the regions, and finally, the fault diagnosis result is output to pinpoint the cause of the fault. This effectively reduces the difficulty of fault diagnosis of the mechanical control circuit and electrical control circuit of the switching device, and solves the technical problem of poor diagnostic effect of fault diagnosis of switching devices in related technologies. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0026] Figure 1 is a flowchart illustrating a fault diagnosis method for a switching device according to this embodiment;

[0027] Figure 2 is a schematic diagram of the mechanism structure of a disconnecting switch according to this embodiment;

[0028] Figure 3 is a schematic diagram of a loop control principle according to this embodiment;

[0029] Figure 4 is a schematic diagram illustrating the functional area division of a disconnector switch according to this embodiment;

[0030] Figure 5 is a schematic diagram illustrating a functional area transmission pulse signal sequence according to this embodiment.

[0031] Figure 6 is a schematic diagram of a detailed diagnostic method for a switching device according to this embodiment;

[0032] Figure 7 is a structural block diagram of a fault diagnosis device for a switching device according to an embodiment of the present invention. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0035] Because switching devices, such as high-voltage disconnect switches, have an open structure and poor sealing of their conductive circuits and transmission mechanisms, they are easily damaged by rust, dirt, and deformation after being exposed to wind and sun for a long time. This can lead to a series of mechanical and electrical faults, such as incomplete opening and closing, jamming, loose contacts, overheating contacts, and drive circuit failures.

[0036] Because research on contact heating of switching devices began relatively early, researchers have conducted simulation analyses of temperature field distributions under different structural parameters, developing a contact monitoring system based on temperature sensors. By analyzing the impact of factors such as component corrosion and wear, and poor contact in conductive circuits on the temperature characteristics of disconnecting switches, a contact temperature monitoring solution has been provided. However, current research on fault identification methods for the control circuits and electrical control circuits of switching devices is limited. Existing solutions cannot effectively diagnose faults in switching devices. Therefore, conducting research on fault diagnosis of control circuits of switching devices is of great significance for improving the intelligence level of switching equipment, proposing targeted maintenance strategies, and enhancing operation and maintenance capabilities.

[0037] Example 1

[0038] According to an embodiment of the present invention, a method embodiment for fault diagnosis of switching devices is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0039] Figure 1 is a flowchart of a fault diagnosis method for a switching device according to this embodiment. As shown in Figure 1, the method includes the following steps:

[0040] Step S102: Based on the multiple functions of the switching device, the control loop of the switching device is divided to obtain multiple functional regions.

[0041] The control loop includes at least a mechanical control loop and an electrical control loop, and the functional area is used to characterize the loop area in the control loop used to achieve the corresponding function.

[0042] The aforementioned switching devices refer to switching devices that can be used in the electrical system of a substation. They generally have two parts: a mechanical control circuit and an electrical control circuit, such as high-voltage disconnect switches and circuit breakers. The following example is a high-voltage disconnect switch.

[0043] Currently, the causes of disconnector switch failures are mainly concentrated in two aspects: one is the mechanism control circuit, such as operating mechanism control circuit failure, mechanism jamming, unqualified process, secondary circuit problems; the other is the electrical control circuit error, which causes the tripping command signal to be unable to be transmitted correctly.

[0044] First, let's analyze the reasons related to the mechanism's control loop:

[0045] Figure 2 is a schematic diagram of the mechanism structure of a disconnecting switch according to this embodiment. As shown in Figure 2, the disconnecting switch is equipped with an electric operating mechanism, which consists of a motor 201, a transmission mechanism 202, a limit switch 203, an auxiliary switch 204, etc. The motor drives the worm gear and worm wheel to rotate through a pair of spur gears. The worm wheel is connected to the output shaft of the mechanism by a key for output. When the switch is in the open / closed position, the mechanism uses a cam mounted on the output shaft to compress the limit switch and cut off the power to the motor.

[0046] The following two factors may contribute to the failure of the disconnecting switch due to problems with the mechanism control circuit:

[0047] (1) Limit switch cuts off motor circuit power in advance

[0048] The abnormality occurred at the initial opening position, with a large remaining travel distance from the opening end point. Therefore, there was no issue with the limit switch cutting off the power when the circuit was in the opening position, and on-site inspection of the limit switch contacts showed no abnormalities.

[0049] (2) Mechanical faults such as internal transmission jamming in the electric mechanism

[0050] After the electric operation fails, the manual opening and closing mechanism is flexible and without jamming in the transmission part. When the mechanism has a mechanical failure, it will burn out the motor or cause the motor power circuit breaker to trip.

[0051] Then, the reasons for the electrical control circuit method are analyzed:

[0052] Figure 3 is a schematic diagram of a loop control principle according to this embodiment. As shown in Figure 3, the closing circuit consists of a micro switch CK1 and a contactor KM1. When the disconnecting switch is in the open position, CK1 is closed. At this time, a closing signal is given, and KM1 is energized. Its normally open contact closes, causing KM1 to self-hold and causing the motor to rotate forward to drive the closing mechanism. The normally closed contact of KM1 opens, locking the open circuit. After closing, CK1 is opened, causing KM1 to lose power and disconnecting the closing circuit.

[0053] The tripping circuit consists of a microswitch CK2 and a contactor KM2. When the disconnecting switch is in the closed position, CK2 closes. A tripping signal is then given, energizing KM2. Its normally open contact closes, causing KM2 to self-hold and reversing the motor to drive the tripping mechanism. KM2's normally closed contact opens, locking the closing circuit. After tripping, CK2 disconnects, de-energizing KM2 and cutting off the tripping circuit.

[0054] The following six factors may contribute to the incomplete opening and closing of disconnecting switches due to problems in the electrical control circuit:

[0055] (1) There are loose contacts or wiring in the control circuit. When the mechanism moves, it will disconnect from the loose contact due to vibration or other reasons, causing the contactor in the control circuit to be de-energized, which in turn causes the motor of the mechanism to be de-energized.

[0056] (2) If there is a loose connection in the motor circuit or the wiring is loose, the mechanism will disconnect from the loose contact point due to vibration or other reasons when it operates, causing the motor circuit to be de-energized. The contactor will continue to self-hold until the circuit breaker power supply is disconnected.

[0057] (3) The normally closed contacts of the trip limit switch CK2 and the manual interlock limit switch CK3, due to faults or loose wiring, are disconnected during operation, switching the control circuit and causing the motor to lose power.

[0058] (4) The contactor itself is faulty or has a loose connection, which causes the contactor to be unable to reliably self-hold during the operation of the mechanism, and the control circuit is disconnected, resulting in the motor being de-energized.

[0059] (5) The control voltage is unstable and the voltage on both sides of the contactor is low, which makes the contactor unable to self-hold and the motor power supply is cut off.

[0060] (6) When the disconnector is operated remotely, the pulse width of the opening and closing command and the time required for the contactor to close may not match. A verification test is required to test the pulse width of the opening and closing command and the time required for the contactor coil to be energized and the normally open contact to close.

[0061] In theory, abnormal operation of disconnect switches with control circuits generally includes abnormal remote or local transmission signal reception, abnormal transmission control circuit, abnormal disconnect switch operating mechanism, and abnormal electrical interlock. Therefore, in order to improve the diagnostic effect of fault diagnosis of switching devices, diagnosis can be carried out on both the mechanical control circuit and the electrical control circuit of the aforementioned switching devices.

[0062] In one optional embodiment, when diagnosing the fault in the control circuit of the switching device, the control circuit can be divided according to the multiple functions of the switching device to obtain multiple different functional areas.

[0063] Step S104: Apply a preset pulse signal wave to the switching device, and obtain the working status of the functional areas in sequence according to the regional positions of multiple functional areas.

[0064] In one optional embodiment, after dividing the control circuit of the switching device into multiple functional areas, the diagnostic system can send a pulse signal wave, such as a square pulse signal, to the control circuit, and sequentially obtain the working state of each functional area under the action of the pulse signal according to the order in which the pulse signal passes through multiple functional areas, and determine whether each functional area in the control circuit is normal based on the working state.

[0065] Step S106: Output diagnostic results based on the working status of multiple functional areas.

[0066] The diagnostic results are used to characterize whether the switching devices have malfunctioned.

[0067] In one optional embodiment, after obtaining the working status of all functional areas, the diagnostic system can diagnose whether a fault has occurred based on the working status of each functional area, and output the final diagnostic result based on the judgment result.

[0068] Optionally, based on the operating status of multiple functional regions, a diagnostic result is output, including: in response to the normal operating status of multiple functional regions, a normal diagnostic result is output, wherein the normal diagnostic result is used to characterize the switching device as normal; in response to the abnormal operating status of any one of the multiple functional regions, a fault diagnostic result is output, wherein the fault diagnostic result includes at least the information corresponding to any one functional region.

[0069] In one optional embodiment, if the diagnostic results for multiple functional areas are all normal, the diagnostic system can output a normal diagnostic result, that is, inform the staff that the control circuit of the switching device is currently without problems; if any one of the diagnostic results for multiple functional areas indicates that the functional area is faulty, the diagnostic system can output a fault diagnosis result, that is, inform the staff that the control circuit of the switching device is currently faulty, and the fault diagnosis result can also include specific faulty area information, such as area name, degree of damage, possible causes of damage, etc., to facilitate the staff in handling the faulty area.

[0070] Through the above steps, the control circuit of the switching device is divided into multiple functional areas based on the multiple functions of the switching device. A preset pulse signal wave is applied to the switching device, and the working status of the functional areas is obtained sequentially according to their regional positions. Based on the working status of multiple functional areas, the diagnostic results are output. By dividing the control circuit of the switching device into regions, fault diagnosis is performed on each functional area in sequence according to the working order of the regions, and finally the fault diagnosis results are output to pinpoint the cause of the fault. This effectively reduces the difficulty of fault diagnosis of the mechanical control circuit and electrical control circuit of the switching device, and solves the technical problem of poor diagnostic effect of fault diagnosis of switching devices in related technologies.

[0071] Optionally, the functional area includes at least: a signal receiving area, a transmission control area, an operating mechanism area, and an electrical interlocking area, wherein the preset pulse signal wave passes through the functional area in the following order: signal receiving area, transmission control area, operating mechanism area, and electrical interlocking area.

[0072] The aforementioned signal receiving area can refer to the circuit area in the switching device used to receive local (near-control) and remote (remote-control) opening and closing signals;

[0073] The aforementioned transmission control area can refer to the circuit area in the switching device used to control the start and stop of the forward and reverse rotation of the motor through relays and contactors, thereby realizing the opening and closing functions;

[0074] The aforementioned operating mechanism area can refer to the circuit area in the switching device used to realize the forward and reverse rotation of the motor, which is the electrical control circuit board.

[0075] The aforementioned electrical interlocking area can refer to the circuit area in the switching device used to realize the forward and reverse interlocking of the motor and avoid the simultaneous occurrence of control logic errors in forward and reverse transmission.

[0076] Generally, the control circuit of a switching device includes at least four functional areas, namely the signal receiving area, the transmission control area, the operating mechanism area, and the electrical interlocking area, but is not limited to these.

[0077] Figure 4 is a schematic diagram of the functional area division of a disconnector switch according to this embodiment. As shown in Figure 4, different functions of the disconnector switch correspond to different areas in its control circuit. Area ① corresponds to the signal receiving function of the disconnector switch, which is the signal receiving area mentioned above. Area ② corresponds to the signal transmission function of the disconnector switch, which is the signal transmission area mentioned above. Area ③ corresponds to the mechanism control function of the disconnector switch, which is the operating mechanism area mentioned above. Area ④ corresponds to the circuit logic execution area of ​​the disconnector switch, which is the electrical interlocking area mentioned above.

[0078] Generally, when a switching device receives the aforementioned preset pulse signal, the signal passes through the four functional areas in the following order: signal receiving area, transmission control area, operating mechanism area, and electrical interlocking area.

[0079] Figure 5 is a schematic diagram of the sequence of pulse signals transmitted in a functional area according to this embodiment. As shown in Figure 5, when the pulse signal passes through the control loop, it is first transmitted to the signal receiving area in the loop, then to the transmission control area in the loop, then to the operating mechanism area in the loop, and finally to the electrical interlocking area in the loop.

[0080] Optionally, the operating states of the functional areas are obtained sequentially according to their regional locations, including: in response to the signal receiving area receiving a preset pulse signal wave, obtaining a first operating state of the signal receiving area, wherein the first operating state is used to characterize whether the switching device performs a preset action, and the preset action is determined by the type of the preset pulse signal wave; in response to the transmission control area receiving a preset pulse signal wave, obtaining a second operating state of the switching device, wherein the second operating state is used to characterize whether the opening and closing of the switching device is in a preset position, and the preset position is determined by the type of the preset pulse signal wave; in response to the operating mechanism area receiving a preset pulse signal wave, obtaining a third operating state of the switching device, wherein the third operating state is used to characterize whether the switching device initiates the opening and closing action; and in response to the electrical interlock area receiving a preset pulse signal wave, obtaining a fourth operating state of the switching device, wherein the fourth operating state is used to characterize whether the switching device operates according to a preset circuit logic.

[0081] In one optional embodiment, when the pulse signal is transmitted to the signal receiving area, the diagnostic system can obtain the current first working state of the signal receiving area and determine whether the switching device has performed a preset action under the action of the pulse signal, such as whether the switching device has performed a tripping or closing operation.

[0082] In one optional embodiment, when the pulse signal is transmitted to the transmission control area, the diagnostic system can obtain the current second working state of the transmission control area and determine whether the preset action performed by the switching device is in place under the action of the pulse signal, that is, whether the opening and closing of the switching device is controlled to run to the preset position.

[0083] For example, as shown in Figure 5, if the drive control area receives a tripping circuit signal, when the current flows through coil LC1 from bottom to top, the motor will reverse, realizing the tripping operation. Under normal circumstances, the power switch ZK is in the closed state. When the tripping circuit signal receiving part receives the tripping pulse signal, the SA contact closes, the CK2 contact closes, the relay KM2 is energized, and all contactors controlled by KM2 will change their original open / closed state. Therefore, the diagnostic system can send a tripping pulse signal to the control circuit of the switching device. After the pulse signal is transmitted to the drive control area, the diagnostic system can determine whether the open / closed state of each contactor in the circuit is consistent with the normal situation.

[0084] In one optional embodiment, the preset action and preset position can be determined by the specific type of the pulse signal. For example, if the pulse signal is a tripping signal, the preset action can refer to the switching device performing a tripping operation, and the preset position can refer to the tripping port.

[0085] In one optional embodiment, when the pulse signal is transmitted to the operating mechanism area, the diagnostic system can obtain the current third operating state of the operating mechanism area and determine whether the switching device can perform the action of starting the opening and closing of the circuit under the action of the pulse signal.

[0086] In one optional embodiment, when the pulse signal is transmitted to the electrical interlocking area, the diagnostic system can obtain the current fourth working state of the electrical interlocking area and determine whether the switching device can work according to the preset circuit logic under the action of the pulse signal, such as opening and closing the circuit according to the preset circuit logic when the electrical interlocking is satisfied.

[0087] Optionally, in response to receiving a preset pulse signal wave in the operating mechanism area, a third operating state of the switching device is obtained, including: performing an operation simulation on the switching device based on multiple preset voltages to obtain multiple third operating states of the switching device.

[0088] In one optional embodiment, when obtaining the third operating state of the switching device and determining whether the operating mechanism area is normal, multiple pulse signals under different preset voltages can be selected to perform multiple operation simulations on the operating mechanism area to improve the accuracy of determining whether the operating mechanism has a problem.

[0089] In one alternative embodiment, the aforementioned multiple preset voltages may be 85%, 100%, or 110% of the rated voltage, but are not limited thereto.

[0090] Optionally, the method further includes: in response to multiple third operating states where the switching device initiates opening and closing actions and the switching device does not pause during the operation, determining that the operating mechanism area is normal; in response to any one of the multiple third operating states where the switching device does not initiate opening and closing actions, or the switching device pauses during the operation, determining that the operating mechanism area is abnormal.

[0091] In one optional embodiment, if all the acquired third operating states indicate that the switching device has initiated the opening and closing action, and there is no jamming during the operation, and the switching device can complete the opening and closing action under the action of external electrical signals, then the above-mentioned operating mechanism area can be considered normal; if any one of the acquired third operating states indicates that the switching device has not initiated the opening and closing action, or there is no jamming during the operation, then the above-mentioned operating mechanism area can be considered abnormal.

[0092] Optionally, the method further includes: determining that the signal receiving area is normal in response to the first operating state of the switching device performing an operating action; and determining that the signal receiving area is abnormal in response to the first operating state of the switching device not performing an operating action.

[0093] In one optional embodiment, if the first operating state is that the switching device has performed a preset operating action, then the signal receiving area can be considered normal; if the first operating state is that the switching device has not performed an operating action, then the signal receiving area can be considered abnormal.

[0094] For example, if the current pulse signal is a tripping signal, the diagnostic system can determine whether the moving contact of the switching device has moved away from the stationary contact by a preset distance, such as 1 cm. If it has, it means that the above-mentioned working action has been performed and the signal receiving area is normal; if it has not, it means that the above-mentioned working action has not been performed and the signal receiving area is abnormal.

[0095] Optionally, the method further includes: determining that the transmission control area is normal in response to the second operating state being that the opening or closing is in a preset position; and determining that the transmission control area is abnormal in response to the second operating state being that the opening or closing is not in a preset position.

[0096] In one optional embodiment, if the obtained second operating state is that the opening and closing of the switching device is controlled to run to a preset position, then the above-mentioned transmission control area can be considered normal; if the obtained second operating state is that the opening and closing of the switching device is not controlled to run to the preset position, then the above-mentioned transmission control area can be considered abnormal.

[0097] Continuing with Figure 5 as an example, if KM2 is energized, the motor reverses and begins the tripping operation, and completes the tripping operation after a period of time, then the transmission area is normal. If, after a period of time, relay KM2 loses power abnormally, causing all closed KM2 contactors to open, the motor stops running immediately before reaching its travel limit. If KM2 is energized again, the motor control power cannot be connected because the KM2 contactors at nodes 33 and 34 are already open. SA is the tripping signal switch, which immediately disconnects upon receiving the tripping pulse signal and remains in the normally open state. The motor remains stopped and cannot be restored, indicating that there is an abnormality in the transmission control area.

[0098] Optionally, the method further includes: determining that the electrical interlocking area is normal in response to the fourth operating state where the switching device operates according to the preset circuit logic; and determining that the electrical interlocking area is abnormal in response to the fourth operating state where the switching device does not operate according to the preset circuit logic.

[0099] In one optional embodiment, if the obtained fourth operating state is that the switching device operates according to the preset circuit logic, for example, the switching device can normally perform the opening and closing operation when the electrical interlocking conditions are met, or when the conditions are not met one by one, then the above-mentioned electrical interlocking area can be considered normal; if the obtained fourth operating state is that the switching device does not operate according to the preset circuit logic, then the above-mentioned electrical interlocking area can be considered abnormal.

[0100] To facilitate understanding of the entire fault diagnosis method for switching devices described above, Figure 6 is a schematic diagram of a detailed diagnostic method for switching devices according to this embodiment. As shown in Figure 6, when diagnosing faults in switching devices, the control loop can first be divided into multiple different functional areas according to its function. Then, the diagnostic system can send a preset pulse signal wave to the switching device to sequentially determine the working status of multiple functional areas, that is, to sequentially determine whether the working status of the signal receiving area, the transmission control area, the operating mechanism area, and the electrical interlocking area is normal. If a fault occurs in any functional area, the diagnosis is stopped and the fault diagnosis result is output; if no fault occurs in any functional area, a normal diagnosis result is output.

[0101] Example 2

[0102] According to another aspect of the embodiments of the present invention, corresponding to the embodiments of the fault diagnosis method for switching devices described above, this specification also provides a fault diagnosis device for switching devices. Please refer to FIG7, which is a structural block diagram of a fault diagnosis device for switching devices according to an embodiment of the present invention. The device includes: a region division module 702, used to divide the control loop of the switching device based on multiple functions of the switching device to obtain multiple functional regions, wherein the control loop includes at least a mechanical control loop and an electrical control loop, and the functional regions are used to characterize the loop regions in the control loop used to realize the corresponding functions; a state acquisition module 704, used to apply a preset pulse signal wave to the switching device and sequentially acquire the working state of the functional regions according to the regional positions of the multiple functional regions; and a result output module 706, used to output fault diagnosis results based on the working states of the multiple functional regions.

[0103] Optionally, the functional area includes at least: a signal receiving area, a transmission control area, an operating mechanism area, and an electrical interlocking area, wherein the preset pulse signal wave passes through the functional area in the following order: signal receiving area, transmission control area, operating mechanism area, and electrical interlocking area.

[0104] Optionally, the status acquisition module 704 includes: a first acquisition unit, configured to acquire a first operating state of the signal receiving area in response to receiving a preset pulse signal wave in the signal receiving area, wherein the first operating state is used to characterize whether the switching device performs a preset action, and the preset action is determined by the type of the preset pulse signal wave; a second acquisition unit, configured to acquire a second operating state of the switching device in response to receiving a preset pulse signal wave in the transmission control area, wherein the second operating state is used to characterize whether the opening and closing of the switching device is in a preset position, and the preset position is determined by the type of the preset pulse signal wave; a third acquisition unit, configured to acquire a third operating state of the switching device in response to receiving a preset pulse signal wave in the operating mechanism area, wherein the third operating state is used to characterize whether the switching device initiates the opening and closing action; and a fourth acquisition unit, configured to acquire a fourth operating state of the switching device in response to receiving a preset pulse signal wave in the electrical interlock area, wherein the fourth operating state is used to characterize whether the switching device operates according to a preset circuit logic.

[0105] Optionally, the third acquisition unit is also used to: perform operational simulation of the switching device based on multiple preset voltages, and acquire multiple third operating states of the switching device.

[0106] Optionally, the device further includes: a first determining module, used to determine that the operating mechanism area is normal in response to multiple third operating states in which the switching device initiates opening and closing actions, and the switching device does not pause during the operation; and a second determining module, used to determine that the operating mechanism area is abnormal in response to any one of the multiple third operating states in which the switching device does not initiate opening and closing actions, or the switching device pauses during the operation.

[0107] Optionally, the device further includes: a third determining module, configured to determine that the signal receiving area is normal in response to the first operating state being that the switching device performs an operating action; and a fourth determining module, configured to determine that the signal receiving area is abnormal in response to the first operating state being that the switching device does not perform an operating action.

[0108] Optionally, the device further includes: a fifth determining module, used to determine that the transmission control area is normal in response to the second operating state being that the opening and closing are in the preset position; and a sixth determining module, used to determine that the transmission control area is abnormal in response to the second operating state being that the opening and closing are not in the preset position.

[0109] Optionally, the result output module 706 includes: a first output module, used to output a normal diagnostic result in response to the normal operating status of multiple functional areas, wherein the normal diagnostic result is used to characterize the switching device as normal; and a second output module, used to output a fault diagnostic result in response to the abnormal operating status of any one of the multiple functional areas, wherein the fault diagnostic result includes at least the information corresponding to any one functional area.

[0110] Example 3

[0111] According to another aspect of the present invention, a computer-readable storage medium is also provided, the computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform the fault diagnosis method of the switching device described in the above method embodiment.

[0112] Example 4

[0113] According to another aspect of the present invention, a processor is also provided, which is used to run a program, wherein the program executes the fault diagnosis method for the switching device described in the above method embodiments.

[0114] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0115] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0116] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be 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 displayed or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between units or modules may be electrical or other forms.

[0117] 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 units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0118] 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.

[0119] If the integrated 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, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0120] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A fault diagnosis method for a switching device, characterized in that, The method includes: dividing the control circuit of the switching device into multiple functional regions based on its various functions, wherein the control circuit includes at least a mechanism control circuit and an electrical control circuit, and the functional regions are used to characterize the circuit regions in the control circuit used to implement corresponding functions; applying a preset pulse signal wave to the switching device, and sequentially acquiring the working state of the functional regions according to their respective regional positions; outputting a diagnostic result based on the working state of the multiple functional regions, wherein the diagnostic result is used to characterize whether the switching device has malfunctioned; wherein the functional regions include at least: a signal receiving region, a transmission control region, an operating mechanism region, and an electrical interlocking region, wherein the preset pulse signal wave passes through the functional regions in the following order: signal receiving region, transmission control region, operating mechanism region, electrical interlocking region; acquiring the working state of the functional regions according to their respective regional positions, including: response. Upon receiving the preset pulse signal wave in the signal receiving area, a first operating state of the signal receiving area is obtained, wherein the first operating state is used to characterize whether the switching device performs a preset action, the preset action being determined by the type of the preset pulse signal wave; in response to receiving the preset pulse signal wave in the transmission control area, a second operating state of the switching device is obtained, wherein the second operating state is used to characterize whether the opening and closing of the switching device is in a preset position, the preset position being determined by the type of the preset pulse signal wave; in response to receiving the preset pulse signal wave in the operating mechanism area, a third operating state of the switching device is obtained, wherein the third operating state is used to characterize whether the switching device initiates the opening and closing action; in response to receiving the preset pulse signal wave in the electrical interlock area, a fourth operating state of the switching device is obtained, wherein the fourth operating state is used to characterize whether the switching device operates according to a preset circuit logic.

2. The method according to claim 1, characterized in that, In response to the receiving of the preset pulse signal wave in the operating mechanism area, the third operating state of the switching device is obtained, including: performing an operation simulation on the switching device based on multiple preset voltages to obtain multiple third operating states of the switching device.

3. The method according to claim 2, characterized in that, The method further includes: in response to the plurality of third operating states all being the action of the switching device to initiate the opening and closing of the circuit breaker, and the switching device does not pause during the operation, determining that the operating mechanism area is normal; in response to any one of the plurality of third operating states being the action of the switching device not initiating the opening and closing of the circuit breaker, or the switching device pausing during the operation, determining that the operating mechanism area is abnormal.

4. The method according to claim 1, characterized in that, The method further includes: determining that the signal receiving area is normal in response to the first operating state in which the switching device performs an operating action; and determining that the signal receiving area is abnormal in response to the first operating state in which the switching device does not perform an operating action.

5. The method according to claim 1, characterized in that, The method further includes: in response to the second working state being that the opening and closing of the circuit breaker is in the preset position, determining that the transmission control area is normal; in response to the second working state being that the opening and closing of the circuit breaker is not in the preset position, determining that the transmission control area is abnormal.

6. The method according to claim 1, characterized in that, The method further includes: determining that the electrical interlocking area is normal in response to the fourth operating state in which the switching device operates according to the preset circuit logic; and determining that the electrical interlocking area is abnormal in response to the fourth operating state in which the switching device does not operate according to the preset circuit logic.

7. The method according to claim 1, characterized in that, Based on the operating status of the multiple functional areas, a diagnostic result is output, including: in response to the normal operating status of all multiple functional areas, a normal diagnostic result is output, wherein the normal diagnostic result is used to characterize the switching device as normal; in response to the abnormal operating status of any one of the multiple functional areas, a fault diagnostic result is output, wherein the fault diagnostic result includes at least the information corresponding to any one of the functional areas.

8. A fault diagnosis device, characterized in that, The device includes: a region division module, used to divide the control circuit of the switching device based on multiple functions of the switching device to obtain multiple functional regions, wherein the control circuit includes at least a mechanism control circuit and an electrical control circuit, and the functional regions are used to characterize the circuit regions in the control circuit used to realize the corresponding functions; a status acquisition module, used to apply a preset pulse signal wave to the switching device and acquire the working status of the functional regions in sequence according to the regional positions of the multiple functional regions; and a result output module, used to output a fault diagnosis result based on the working status of the multiple functional regions; wherein the functional regions include at least: a signal receiving region, a transmission control region, an operating mechanism region, and an electrical interlocking region, wherein the preset pulse signal wave passes through the functional regions in the following order: signal receiving region, transmission control region, operating mechanism region, and electrical interlocking region; the status acquisition module is also used to respond to the signal receiving region receiving... Upon receiving the preset pulse signal wave, the system acquires a first operating state of the signal receiving area, wherein the first operating state characterizes whether the switching device performs a preset action, the preset action being determined by the type of the preset pulse signal wave; in response to the transmission control area receiving the preset pulse signal wave, the system acquires a second operating state of the switching device, wherein the second operating state characterizes whether the opening and closing of the switching device is at a preset position, the preset position being determined by the type of the preset pulse signal wave; in response to the operating mechanism area receiving the preset pulse signal wave, the system acquires a third operating state of the switching device, wherein the third operating state characterizes whether the switching device initiates the opening and closing action; in response to the electrical interlock area receiving the preset pulse signal wave, the system acquires a fourth operating state of the switching device, wherein the fourth operating state characterizes whether the switching device operates according to preset circuit logic.

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