A method and system for monitoring current status of circuit breaker in ultra-high voltage converter station

Abstract

The present application provides a method and system for monitoring the current status of a circuit breaker in an ultra-high voltage converter station. The method comprises: obtaining a current signal from the current sensor, the current signal being used to indicate the current value at the opening and closing coil during a primary opening process of the circuit breaker; generating a first current waveform according to the current signal; obtaining a target moving length of the moving iron core and a weight of the moving iron core; obtaining a second current waveform according to the target moving length and the weight, the second current waveform being a current waveform at the opening and closing coil corresponding to a primary opening process of the circuit breaker under the target moving length and the weight; and determining the fault type of the moving iron core according to the first current waveform and the second current waveform, the fault type including a moving iron core deformation fault or a moving iron core movement fault. This can improve the accuracy and efficiency of fault detection of circuit breakers.

Description

Technical Field

[0001] The present application relates to the field of power equipment detection, and specifically to a method and system for monitoring the current status of a circuit breaker in an ultra-high voltage converter station. Background Art

[0002] High-voltage circuit breakers are used to disconnect or connect circuits in power systems to protect equipment and personnel in the event of a fault or maintenance. They are commonly used in high-voltage power systems, such as transmission lines, substations, and industrial power systems. If a circuit breaker failure is not promptly monitored and detected, it can cause a prolonged power outage and significant losses. Currently, when a high-voltage circuit breaker failure is detected, the detection accuracy is low and the fault type cannot be directly determined. This prevents power companies from performing timely and accurate maintenance, resulting in unnecessary downtime or equipment replacement. Summary of the Invention

[0003] The embodiments of the present application provide a method and system for monitoring the current status of a circuit breaker in an ultra-high voltage converter station, so as to accurately identify the fault type of the circuit breaker and improve the accuracy and efficiency of fault detection of the circuit breaker.

[0004] In a first aspect, an embodiment of the present application provides a method for monitoring the current state of a UHV converter station circuit breaker, which is applied to a current monitoring device of a UHV converter station circuit breaker current state monitoring system. The UHV converter station circuit breaker current state monitoring system includes the current monitoring device, a circuit breaker, and a current sensor. The circuit breaker includes an opening and closing coil and a moving iron core. The moving iron core is moved by an electromagnetic force generated by the opening and closing coil to control the opening or closing of the circuit breaker. The current sensor is connected to the opening and closing coil. The method includes:

[0005] Acquire a current signal from the current sensor, wherein the current signal is used to indicate a current value at the opening and closing coil during a primary opening process of the circuit breaker;

[0006] generating a first current waveform diagram according to the current signal;

[0007] Obtaining a target moving length of the moving iron core and a weight of the moving iron core;

[0008] acquiring a second current waveform diagram according to the target moving length and the weight, wherein the second current waveform diagram is a current waveform diagram at the opening and closing coil corresponding to one opening process of the circuit breaker under the target moving length and the weight;

[0009] The fault type of the moving iron core is determined according to the first current waveform diagram and the second current waveform diagram, where the fault type includes a moving iron core deformation fault or a moving iron core movement fault.

[0010] In a second aspect, an embodiment of the present application provides a current state monitoring system for a UHV converter station circuit breaker, comprising a current monitoring device, a circuit breaker, and a current sensor. The circuit breaker comprises an opening and closing coil and a moving iron core. The moving iron core is moved by an electromagnetic force generated by the opening and closing coil to control the opening or closing of the circuit breaker. The current sensor is connected to the opening and closing coil, wherein:

[0011] The current monitoring device is configured to perform the operations performed by the current monitoring device in the first aspect above;

[0012] The current sensor is configured to perform the operation performed by the current sensor in the first aspect above;

[0013] The circuit breaker is used to perform the operations performed by the circuit breaker in the first aspect.

[0014] It can be seen that in this embodiment, the current monitoring device first obtains the current signal from the current sensor, and the current signal is used to indicate the current value at the opening and closing coil during the single opening process of the circuit breaker, and then generates a first current waveform diagram based on the current signal, and then obtains the target moving length of the moving iron core and the weight of the moving iron core, and then obtains the second current waveform diagram based on the target moving length and the weight, and the second current waveform diagram is the current waveform diagram at the opening and closing coil corresponding to the single opening process of the circuit breaker under the target moving length and the weight, and finally, the fault type of the moving iron core is determined based on the first current waveform diagram and the second current waveform diagram, and the fault type includes a moving iron core deformation fault or a moving iron core movement fault.

[0015] The UHV converter station circuit breaker current status monitoring system of this solution realizes the function of circuit breaker fault monitoring and circuit breaker fault type identification based on the analysis of current waveform, thereby improving the accuracy and efficiency of circuit breaker fault detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 This is a schematic diagram of the composition of a UHV converter station circuit breaker current status monitoring system provided by an embodiment of the present application;

[0018] Figure 21 is a schematic structural diagram of a current monitoring device provided in an embodiment of the present application;

[0019] Figure 3 This is a schematic structural diagram of a circuit breaker provided in an embodiment of the present application;

[0020] Figure 4 This is a flow chart of a method for monitoring the current status of a circuit breaker in a UHV converter station provided in an embodiment of the present application;

[0021] Figure 5 is a schematic diagram of a first current waveform diagram provided in an embodiment of the present application;

[0022] Figure 6 is a schematic diagram of a combined current waveform provided in an embodiment of the present application;

[0023] Figure 7 This is a schematic diagram of another combined current waveform provided in an embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] The terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish between different objects, not to describe a particular order. Furthermore, the terms "including," "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or elements is not limited to the listed steps or elements but may optionally include steps or elements not listed, or may optionally include other steps or elements inherent to the process, method, product, or apparatus.

[0026] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0027] Statement: The data obtained in this plan are all from legal channels and used for legal purposes.

[0028] Currently, when a high-voltage circuit breaker fault is detected, the fault type cannot be directly determined due to low detection accuracy. This prevents power companies from performing timely and accurate maintenance, resulting in unnecessary downtime or equipment replacement.

[0029] In response to the above problems, an embodiment of the present application provides a method and system for monitoring the current status of a circuit breaker in a UHV converter station. The embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0030] See also Figure 1 , Figure 1 The present invention provides a schematic diagram of the components of a UHV converter station circuit breaker current state monitoring system. The UHV converter station circuit breaker current state monitoring system 10 includes a current monitoring device 101, a current sensor 102, and a circuit breaker 103. The current sensor 102 is connected to the current monitoring device 101 and the circuit breaker 103, respectively, and is configured to obtain the current value at the circuit breaker 103 and transmit the obtained current to the current monitoring device 101. The current monitoring device generates a current waveform based on the obtained current value and analyzes the current waveform to determine whether the circuit breaker 103 is faulty and the type of fault.

[0031] See also Figure 2 , Figure 2 1 is a schematic diagram of the structure of a current monitoring device provided in an embodiment of the present application. The current monitoring device 101 includes a processor 120, a memory 130, a communication interface 140, and one or more programs 131, wherein the one or more programs 131 are stored in the above-mentioned memory 130 and are configured to be executed by the above-mentioned processor 120, and the one or more programs 131 include instructions for executing any step in the following method embodiment. In a specific implementation, the processor 120 is used to execute any step performed by the current monitoring device in the following method embodiment, and when performing data transmission such as sending, the communication interface 140 can be optionally called to complete the corresponding operation.

[0032] See also Figure 3 , Figure 3 This is a schematic diagram of the structure of a circuit breaker provided in an embodiment of the present application. The circuit breaker 103 includes a tripping coil, a moving iron core, and a stationary iron core. The moving iron core is moved by the electromagnetic force generated by the tripping coil to control the opening or closing of the circuit breaker. Specifically, when the moving iron core moves upward a distance x, reaching its maximum travel position, the circuit breaker completes a tripping process. Specifically, the current sensor 102 captures the current value at the tripping coil during each tripping process of the circuit breaker 103.

[0033] See also Figure 4 , Figure 4The present invention provides a flow chart of a method for monitoring the current state of a UHV converter station circuit breaker provided in an embodiment of the present invention. The method is applied to a current monitoring device of a UHV converter station circuit breaker current state monitoring system, and includes the following steps.

[0034] S401: Acquire a current signal from the current sensor.

[0035] The current signal is used to indicate the current value at the opening and closing coil during a primary opening process of the circuit breaker. The current signal includes the current value and time, meaning that the current value at the opening and closing coil at each moment can be obtained based on the current signal. During a primary opening process, the moment the opening process begins is the moment the opening and closing coil is energized.

[0036] S402: Generate a first current waveform diagram according to the current signal.

[0037] Among them, such as Figure 5 As shown, Figure 5 This is a schematic diagram of a first current waveform diagram provided in an embodiment of the present application. The current monitoring device can plot the current waveform at the opening and closing coil during a single opening process based on the acquired current signal to obtain a first current waveform diagram. Based on this first current waveform diagram, the current value at the opening and closing coil at each moment during the single opening process can be obtained.

[0038] S403: Obtain a target moving length of the moving iron core and a weight of the moving iron core.

[0039] Among them, such as Figure 3 In the circuit breaker shown, the moving iron core moves upward based on the magnetic force of the opening and closing coils. The movable distance of the moving iron core in the circuit breaker is the target moving length, which is given by Figure 3 It can be seen that the target moving length is Figure 3 The X shown in .

[0040] S404: Obtain a second current waveform according to the target moving length and the weight.

[0041] The second current waveform diagram is a current waveform diagram at the opening and closing coil corresponding to one opening process of the circuit breaker under the target moving length and the weight.

[0042] S405: Determine a fault type of the moving iron core according to the first current waveform diagram and the second current waveform diagram.

[0043] Among them, the fault type includes a moving iron core deformation fault or a moving iron core movement fault. When the moving iron core has a deformation fault, the target movement length of the moving iron core will change. When the moving iron core has a movement fault, the movement of the moving iron core will be hindered, and a greater force will be required to move the moving iron core to the farthest position. That is, it can be similar to the weight change of the moving iron core. Therefore, when the target movement length of the moving iron core changes or the weight changes, the corresponding current waveform will change. Based on the first current waveform and the second current waveform, it can be analyzed whether the circuit breaker is faulty and the corresponding fault type.

[0044] It can be seen that in this embodiment, the current monitoring device first obtains the current signal from the current sensor, and the current signal is used to indicate the current value at the opening and closing coil during the one-time opening process of the circuit breaker. Then, a first current waveform is generated according to the current signal, and then the target moving length of the moving iron core and the weight of the moving iron core are obtained. Then, a second current waveform is obtained according to the target moving length and the weight. The second current waveform is the current waveform at the opening and closing coil corresponding to the one-time opening process of the circuit breaker under the target moving length and the weight. Finally, the fault type of the moving iron core is determined according to the first current waveform and the second current waveform, and the fault type includes a moving iron core deformation fault or a moving iron core movement fault. The UHV converter station circuit breaker current state monitoring system of this scheme realizes the function of circuit breaker fault monitoring and circuit breaker fault type identification based on the analysis of the current waveform, thereby improving the accuracy and detection efficiency of circuit breaker fault detection.

[0045] In a possible embodiment, before determining the fault type of the moving iron core according to the first current waveform graph and the second current waveform graph, the method further includes: obtaining a reference inflection point of the first current waveform graph, the reference inflection point being used to indicate a point at which the current in the first current waveform graph suddenly changes, obtaining a first reference inflection point and a second reference inflection point according to a time corresponding to the reference inflection point, and the time corresponding to the first reference inflection point being earlier than the second reference inflection point; obtaining a standard inflection point of the second current waveform graph, the standard inflection point being used to indicate a point at which the current in the second current waveform graph suddenly changes, obtaining a first standard inflection point and a second standard inflection point according to a time corresponding to the standard inflection point, and the time corresponding to the first standard inflection point being earlier than the second standard inflection point; determining whether the time corresponding to the second reference inflection point is later than the time corresponding to the second standard inflection point; if earlier than or equal to the time corresponding to the second reference inflection point, determining that the moving iron core does not have the moving iron core deformation fault or the moving iron core movement fault; if later than the time corresponding to the second reference inflection point, determining the fault type of the moving iron core according to the first current waveform graph and the second current waveform graph.

[0046] Among them, such as Figure 5 As shown, Figure 5 This is a schematic diagram of the first current waveform provided in an embodiment of the present application. Figure 5 Point A shown in the figure is the first reference inflection point, and point B is the second reference inflection point. During a tripping process, when the tripping and closing coil is energized, as the current of the tripping and closing coil increases, the electromagnetic force on the moving iron core will also increase, and the moving iron core will begin to move. Due to the movement of the moving iron core, a back electromotive force will appear, which will hinder the increase in the current of the tripping and closing coil. Therefore, as the moving iron core moves, the current of the coil will begin to decrease. At this time, a point of current mutation will appear in the first current waveform, which is the first reference inflection point. After the moving iron core continues to move the target moving distance, the moving iron core moves to the farthest position. At this time, the movement speed of the moving iron core drops to 0, the back electromotive force disappears, and the current of the tripping and closing coil will begin to increase again. At this time, a second point of current mutation will appear in the first current waveform, which is the second reference inflection point. Similarly, the first standard inflection point and the second standard inflection point in the second current waveform have the same physical meaning as the first reference inflection point and the second reference inflection point, respectively, and will not be repeated here.

[0047] In a specific implementation, when a moving iron core deformation fault occurs, the target movement distance of the moving iron core is increased, thereby increasing the time it takes for the moving iron core to reach its farthest position, i.e., the second reference inflection point will be later than the first reference inflection point. When a moving iron core movement fault occurs, the impeded movement of the moving iron core will cause the acceleration of the moving iron core to decrease, increasing the time it takes for the moving iron core to reach its farthest position, i.e., the second reference inflection point will also be later than the first reference inflection point. Therefore, the presence of a moving iron core deformation fault or a moving iron core movement fault can be determined based on the time of the second reference inflection point compared to the first reference inflection point.

[0048] It can be seen that in this embodiment, based on the time sequence of the second reference inflection point and the second standard inflection point, the situation where there is no movable iron core deformation fault or movable iron core movement fault can be directly excluded, which can improve the efficiency of circuit breaker fault detection.

[0049] In a possible embodiment, determining the fault type of the moving iron core based on the first current waveform diagram and the second current waveform diagram includes: determining the time difference between the time corresponding to the first reference inflection point and the time corresponding to the first standard inflection point; when the time difference is greater than zero, determining that the fault type of the moving iron core is the moving iron core movement fault; when the time difference is less than zero, determining the fault type of the moving iron core based on the second standard inflection point and the second reference inflection point.

[0050] Among them, when the time of the second reference inflection point is later than the time of the second standard inflection point, it means that there is a moving iron core deformation fault or a moving iron core movement fault. At this time, it is necessary to judge the fault type based on the first standard inflection point and the first reference inflection point. Since the moving iron core is hindered from moving, the reaction force that needs to be overcome when the moving iron core moves increases, which delays the time when the moving iron core starts to move. Therefore, if the time difference is greater than zero, it means that the time of the first reference inflection point is later than the time of the first standard inflection point, and the fault type can be directly determined to be an iron core movement fault. For example Figure 6 As shown, Figure 6 This is a schematic diagram of a combined current waveform provided in an embodiment of the present application. Figure 6 The black line represents the current waveform in the second current waveform diagram, and the blue line represents the current waveform in the first current waveform diagram. Figure 6 It can be seen that the time of the second reference inflection point is later than the time of the second standard inflection point, and the time of the first reference inflection point is later than the time of the first standard inflection point. Therefore, it can be determined that the circuit breaker corresponding to the first current waveform diagram has a moving iron core movement fault.

[0051] It can be seen that in this embodiment, whether the circuit breaker has a moving iron core movement fault is determined based on the time sequence of the first reference inflection point and the first standard inflection point, which improves the accuracy of monitoring the circuit breaker fault and improves the detection efficiency.

[0052] In a possible embodiment, determining the fault type of the moving iron core based on the second standard inflection point and the second reference inflection point includes: obtaining a first current value corresponding to the second standard inflection point and a second current value corresponding to the second reference inflection point; determining whether the first current value is greater than the second current value; and if so, determining that the fault type of the moving iron core is the moving iron core deformation fault.

[0053] Among them, since a short circuit in the opening and closing coil may also cause the time for the moving iron core to move to the farthest position to be delayed, when determining whether the moving iron core has a moving iron core deformation fault, it is also necessary to further determine the current value at the opening and closing coil when the moving iron core moves to the farthest position. When the current value at the second reference inflection point is less than the current value at the second standard inflection point, it is determined that the moving iron core has a moving iron core deformation fault. For example Figure 7 As shown, Figure 7 This is a schematic diagram of another combined current waveform provided in an embodiment of the present application. Figure 7 The black line represents the current waveform in the second current waveform diagram, and the red line represents the current waveform in the first current waveform diagram. Figure 7It can be seen that at this time, the time of the second reference inflection point is later than the time of the second standard inflection point, and the time of the first reference inflection point is earlier than the time of the first standard inflection point, and the current value at the second reference inflection point is smaller than the current value at the second standard inflection point. Therefore, it can be judged that the circuit breaker corresponding to the first current waveform diagram has a moving iron core movement fault.

[0054] It can be seen that in this embodiment, determining whether there is a moving iron core movement fault based on the reference inflection point, the standard inflection point, and the current values ​​corresponding to the second reference inflection point and the second standard inflection point can improve the accuracy of judging the circuit breaker fault type.

[0055] In a possible embodiment, before determining that the fault type of the moving iron core is the moving iron core movement fault, the method also includes: obtaining a first current value corresponding to the second standard inflection point and a second current value corresponding to the second reference inflection point; determining whether the first current value is greater than the second current value; if so, determining that the fault type of the moving iron core is the moving iron core movement fault.

[0056] Among them, when there is a moving iron core movement failure, the moving iron core movement is blocked, and the electromagnetic force to overcome the reaction force and start moving will also increase accordingly, so the current required will also increase. Therefore, before determining that there is a moving iron core movement failure, it is also possible to determine whether the current value of the opening and closing coil increases when the moving iron core moves to the farthest distance. If the current value increases, it is determined that there is a moving iron core movement failure. For example Figure 6 As shown, the current value corresponding to the second reference inflection point is higher than the current value corresponding to the first reference inflection point.

[0057] It can be seen that in this embodiment, determining whether there is a moving iron core movement fault based on the current values ​​of the second reference inflection point and the second standard inflection point again can improve the accuracy of determining the circuit breaker fault type.

[0058] In a possible embodiment, before obtaining the standard inflection point of the second current waveform, the method further includes: obtaining a time point in the second current waveform indicating the moment when the circuit breaker is powered on; determining the time point as an initial time; and aligning the second current waveform with the first current waveform according to the initial time.

[0059] Since accurate time is required to determine whether a circuit breaker is faulty and, if so, the fault type, when a fault occurs, the timing of the first and second current waveforms must be aligned when analyzing them. Specifically, the initial timing of the two current waveforms is determined to be the moment when power is applied to the opening and closing coils.

[0060] It can be seen that in this embodiment, determining the moment when the opening and closing coil is energized as the initial event of the first current waveform diagram and the second current waveform diagram can improve the accuracy of judging the type of circuit breaker fault and realize a comprehensive analysis of the current changes in a single opening process.

[0061] In a possible embodiment, after determining that the fault type of the moving iron core is the moving iron core deformation fault, the method further includes: determining that in the first current waveform diagram, the waveform curve between the first reference inflection point and the second reference inflection point is a first target curve; obtaining a first slope of the first target curve; determining that in the second current waveform diagram, the waveform curve between the first standard point and the second standard inflection point is a second target curve; obtaining a second slope of the second target curve; and determining the degree of deformation of the moving iron core based on the first slope and the second slope.

[0062] Among them, such as Figure 7 As shown, when there is a deformation fault of the moving iron core, the time when the moving iron core starts to move is advanced and the current value increases, and the time when the moving iron core moves to the farthest position is delayed and the current value decreases. Therefore, when there is a deformation fault of the moving iron core, the slope of the first target curve will change significantly, so the degree of deformation can be directly judged based on the slope. The slope of the first target curve can be directly determined based on the coordinate value of the first reference inflection point and the coordinate value of the second reference inflection point. After obtaining the degree of deformation, a prompt message can be output when the degree of deformation is greater than a preset value. The prompt message is used to instruct the power company to replace the circuit breaker. When the degree of deformation is less than the preset value, a second prompt message can be output. The second prompt message includes a maintenance plan, that is, informing the power company to maintain the circuit breaker based on different degrees of deformation to reduce the possibility of power outages and extend the life of the circuit breaker, such as maintaining the environment in which the circuit breaker is located.

[0063] It can be seen that in this embodiment, determining the deformation degree of the moving iron core based on the slope of the first target curve can improve the efficiency of determining the deformation degree while ensuring the accuracy of the judgment of the deformation degree.

[0064] In a possible embodiment, determining the degree of deformation of the moving iron core based on the first slope and the second slope includes: determining the difference between the second slope and the first slope to obtain a target slope difference; determining the degree of deformation of the moving iron core based on the target slope difference, wherein the greater the target slope difference, the greater the degree of deformation.

[0065] Among them, when the deformation degree of the moving iron core is greater, the moving iron core will move a greater distance, so the corresponding time when the moving iron core starts to move will be advanced and the corresponding current will increase, and the time when the moving iron core moves to the farthest position will be delayed, and the current will decrease. Therefore, the greater the deformation degree, the smaller the current corresponding slope is relative to the target slope. The slope difference corresponding to different pre-set deformation degrees can be obtained, and then the corresponding deformation degree can be determined based on the currently obtained target slope difference.

[0066] It can be seen that in this embodiment, the deformation degree of the moving iron core is determined according to the difference between the first slope and the second slope, which can simply and quickly determine the deformation degree and improve the efficiency of detecting the fault of the moving iron core.

[0067] In a possible embodiment, after determining that the fault type of the moving iron core is the moving iron core deformation fault, the method further includes: obtaining a first time difference based on the time corresponding to the first reference inflection point and the time corresponding to the second reference inflection point; obtaining a second time difference based on the time corresponding to the first standard inflection point and the time corresponding to the second standard inflection point; determining a current moving length based on the target moving length, the first time difference and the second time difference; and determining a degree of deformation of the moving iron core based on the current moving length and the target moving length.

[0068] Among them, since the greater the deformation of the moving iron core, the greater the moving distance of the moving iron core will be, the time from the start of the moving iron core movement to the maximum distance will be increased. At this time, it can be obtained that when the time difference is larger, it means that the moving iron core has moved a longer distance, and the corresponding deformation of the moving iron core is greater. The acceleration of the moving iron core can be determined based on the target movement length and the second time difference, and then the current movement length can be determined based on the acceleration and the first time difference. The difference between the current movement length and the target movement length can indicate the deformation degree of the moving iron core.

[0069] It can be seen that in this embodiment, the deformation degree is determined based on the current moving length of the moving iron core, which can improve the efficiency and accuracy of detecting the fault of the moving iron core.

[0070] The above embodiments can be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via wired or wireless means. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that contains one or more available media sets. The available medium can be a magnetic medium (for example, a floppy disk, a hard disk, a tape), an optical medium (for example, a DVD), or a semiconductor medium. The semiconductor medium can be a solid-state drive.

[0071] An embodiment of the present application also provides a computer storage medium, wherein the computer storage medium stores a computer program for electronic data exchange, and the computer program enables a computer to execute part or all of the steps of any method described in the above method embodiments, and the above computer includes an electronic device.

[0072] The present application also provides a computer program product comprising a non-transitory computer-readable storage medium storing a computer program, wherein the computer program is operable to cause a computer to perform some or all of the steps of any of the methods described in the above method embodiments. The computer program product may be a software installation package, and the computer may comprise an electronic device.

[0073] It should be noted that for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that this application is not limited by the order of the actions described, because according to this application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by this application.

[0074] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0075] In the several embodiments provided in this application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the above-mentioned units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical or other forms.

[0076] The units described above as separate components may or may not be physically separate, and 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 these units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0077] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0078] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application, 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, which is stored in a memory and includes a number of instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to execute all or part of the steps of the above-mentioned methods of each embodiment of the present application. The aforementioned memory includes: various media that can store program codes, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk.

[0079] Those skilled in the art will appreciate that all or part of the steps in the various methods of the above embodiments can be completed by instructing related hardware through a program. The program can be stored in a computer-readable memory, and the memory can include: a flash drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0080] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for those skilled in the art, according to the idea of ​​the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for monitoring the current status of a circuit breaker in a UHV converter station, characterized in that: A current monitoring device applied to a current state monitoring system for a UHV converter station circuit breaker, the UHV converter station circuit breaker current state monitoring system comprising the current monitoring device, a circuit breaker, and a current sensor, the circuit breaker comprising an opening and closing coil and a moving iron core, the moving iron core being moved by an electromagnetic force generated by the opening and closing coil to control the opening or closing of the circuit breaker, the current sensor being connected to the opening and closing coil, and the method comprising: Acquire a current signal from the current sensor, wherein the current signal is used to indicate a current value at the opening and closing coil during a primary opening process of the circuit breaker; generating a first current waveform diagram according to the current signal; Obtaining a target moving length of the moving iron core and a weight of the moving iron core; acquiring a second current waveform diagram according to the target moving length and the weight, wherein the second current waveform diagram is a current waveform diagram at the opening and closing coil corresponding to one opening process of the circuit breaker under the target moving length and the weight; determining a fault type of the moving iron core according to the first current waveform diagram and the second current waveform diagram, the fault type including a moving iron core deformation fault or a moving iron core movement fault; Before determining the fault type of the moving iron core according to the first current waveform diagram and the second current waveform diagram, the method further includes: Obtaining a reference inflection point of the first current waveform, the reference inflection point being used to indicate a point at which the current suddenly changes in the first current waveform, and obtaining a first reference inflection point and a second reference inflection point based on a time corresponding to the reference inflection point, wherein the time corresponding to the first reference inflection point is earlier than the time corresponding to the second reference inflection point; Obtaining a standard inflection point of the second current waveform, the standard inflection point being used to indicate a point at which the current in the second current waveform changes suddenly, and obtaining a first standard inflection point and a second standard inflection point based on a time corresponding to the standard inflection point, wherein the time corresponding to the first standard inflection point is earlier than that corresponding to the second standard inflection point; determining whether a time corresponding to the second reference inflection point is later than a time corresponding to the second standard inflection point; If it is earlier than or equal to the time corresponding to the second reference inflection point, it is determined that the movable iron core does not have the movable iron core deformation fault or the movable iron core movement fault; If it is later than the time corresponding to the second reference inflection point, the fault type of the moving iron core is determined according to the first current waveform diagram and the second current waveform diagram.

2. The method according to claim 1, characterized in that The determining the fault type of the moving iron core according to the first current waveform diagram and the second current waveform diagram includes: Determine a time difference between a time corresponding to the first reference inflection point and a time corresponding to the first standard inflection point; When the time difference is greater than zero, determining that the fault type of the moving iron core is the moving iron core movement fault; When the time difference is less than zero, the fault type of the moving iron core is determined according to the second standard inflection point and the second reference inflection point.

3. The method according to claim 2, characterized in that The determining the fault type of the moving iron core according to the second standard inflection point and the second reference inflection point includes: Obtaining a first current value corresponding to the second standard inflection point and a second current value corresponding to the second reference inflection point; determining whether the first current value is greater than the second current value; If so, it is determined that the fault type of the moving iron core is a deformation fault of the moving iron core.

4. The method according to claim 2, characterized in that Before determining that the fault type of the moving iron core is the moving iron core movement fault, the method further includes: Obtaining a first current value corresponding to the second standard inflection point and a second current value corresponding to the second reference inflection point; determining whether the first current value is greater than the second current value; If so, it is determined that the fault type of the moving iron core is a moving iron core movement fault.

5. The method according to claim 1, wherein Before obtaining the standard inflection point of the second current waveform, the method further includes: Obtaining a time point in the second current waveform indicating the moment when the circuit breaker is powered on; Determining the time point as an initial time; The second current waveform is aligned with the first current waveform according to the initial time.

6. The method according to claim 3, characterized in that After determining that the fault type of the moving iron core is the moving iron core deformation fault, the method further includes: Determine, in the first current waveform graph, a waveform curve between the first reference inflection point and the second reference inflection point as a first target curve; obtaining a first slope of the first target curve; Determine, in the second current waveform graph, a waveform curve between the first standard inflection point and the second standard inflection point as a second target curve; obtaining a second slope of the second target curve; The deformation degree of the moving iron core is determined according to the first slope and the second slope.

7. The method according to claim 6, characterized in that The determining the deformation degree of the moving iron core according to the first slope and the second slope includes: determining a difference between the second slope and the first slope to obtain a target slope difference; The degree of deformation of the moving iron core is determined according to the difference in the target slopes. The greater the difference in the target slopes, the greater the degree of deformation.

8. The method according to claim 3, characterized in that After determining that the fault type of the moving iron core is the moving iron core deformation fault, the method further includes: Obtaining a first time difference according to the time corresponding to the first reference inflection point and the time corresponding to the second reference inflection point; Obtaining a second time difference according to the time corresponding to the first standard inflection point and the time corresponding to the second standard inflection point; determining a current movement length according to the target movement length, the first time difference, and the second time difference; The deformation degree of the moving iron core is determined according to the current moving length and the target moving length.

9. A UHV converter station circuit breaker current status monitoring system, characterized in that: It includes a current monitoring device, a circuit breaker and a current sensor. The circuit breaker includes an opening and closing coil and a moving iron core. The moving iron core is moved by the electromagnetic force generated by the opening and closing coil to control the opening or closing of the circuit breaker. The current sensor is connected to the opening and closing coil, wherein: The current monitoring device is configured to perform the operations performed by the current monitoring device in any one of claims 1 to 8; The current sensor is configured to perform the operation performed by the current sensor in any one of the methods of claims 1 to 8; The circuit breaker is configured to perform the operation performed by the circuit breaker in any one of the methods of claims 1-8.

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