A condition monitoring method, apparatus and storage medium

Abstract

A condition monitoring method, apparatus, and storage medium relate to the field of circuit detection technology, addressing the technical problem of the inability to accurately monitor the operating status of capacitors manually. The method includes: after determining the three-phase current imbalance and the rate of change of the three-phase current imbalance of the capacitor to be monitored, determining that the operating status of the capacitor to be monitored is abnormal when the three-phase current imbalance and the rate of change of the three-phase current imbalance meet preset conditions. This application can avoid the problems of missed detections and false detections caused by manual inspection, improving the accuracy of monitoring the operating status of capacitors.

Description

Technical Field

[0001] This application belongs to the field of circuit detection technology, and in particular relates to a state monitoring method, device and storage medium. Background Technology

[0002] Currently, in low-voltage power supply and distribution systems, multiple capacitors are typically installed on the power busbar on the low-voltage side of the power transformer to compensate for reactive power and improve power supply quality.

[0003] However, these capacitors have a limited lifespan, and with continuous use, they are prone to deformation, leakage, and even explosions. Related technologies primarily rely on regular manual inspections of the power room where these capacitors operate to check for leaks, deformation, or other problems, and to eliminate potential safety hazards.

[0004] However, this method of relying on manual inspection makes the safety detection of capacitors depend on the professional skills and conscientiousness of the personnel. As a result, the management platform of the low-voltage power supply and distribution system cannot detect problems such as capacitor leakage and deformation in a timely manner, and it is easy to miss or misdetect, which greatly affects the safe operation of the power room. Summary of the Invention

[0005] This application provides a condition monitoring method, apparatus, and storage medium to solve the problem that manual monitoring of the operating status of capacitors is not possible.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] Firstly, a condition monitoring method is provided. This condition monitoring method is executed by a condition monitoring device and includes: after determining the three-phase current imbalance degree and the rate of change of the three-phase current imbalance degree of the capacitor to be monitored, determining that the operating state of the capacitor to be monitored is abnormal when the three-phase current imbalance degree and the rate of change of the three-phase current imbalance degree meet preset conditions.

[0008] Optionally, the aforementioned preset conditions include: the three-phase current imbalance is greater than a first threshold, and the rate of change of the three-phase current imbalance is greater than a second threshold; the three-phase current imbalance is greater than the first threshold, and the rate of change of the three-phase current imbalance is less than or equal to the second threshold; and the three-phase current imbalance is less than or equal to the first threshold, and the rate of change of the three-phase current imbalance is greater than the second threshold.

[0009] Optionally, the condition monitoring method further includes: determining the operating state of the capacitor to be monitored as normal when the three-phase current imbalance is less than or equal to a first threshold and the rate of change of the three-phase current imbalance is less than or equal to a second threshold.

[0010] Optionally, the state monitoring method further includes: acquiring multiple sample current information. Each sample current information is the three-phase current information of a sample capacitor when it transitions from a normal state to an abnormal state. Multiple sample imbalances and their rates of change are determined corresponding to the multiple sample current information. Specifically, each sample imbalance corresponds to one sample current information, and each sample current information also corresponds to one rate of change of the sample imbalance. A first threshold and a second threshold are determined based on the multiple sample imbalances and their rates of change.

[0011] Optionally, the aforementioned first threshold is the product of a preset coefficient and the average of the imbalance degrees of multiple samples. The aforementioned second threshold is the product of a preset coefficient and the average of the rates of change of the imbalance degrees of multiple samples.

[0012] Alternatively, the aforementioned first threshold can be the minimum of the multiple sample imbalances. The aforementioned second threshold can be the minimum of the multiple sample imbalance rates.

[0013] Optionally, the status monitoring method may also include: outputting alarm information corresponding to the abnormal status.

[0014] Secondly, a condition monitoring device is provided, comprising: a first determining unit and a second determining unit. The first determining unit is used to determine the three-phase current imbalance and the rate of change of the three-phase current imbalance of the capacitor to be monitored. The second determining unit is further used to determine that the operating state of the capacitor to be monitored is an abnormal state when the three-phase current imbalance and the rate of change of the three-phase current imbalance meet preset conditions.

[0015] Optionally, the aforementioned preset conditions include: the three-phase current imbalance is greater than a first threshold, and the rate of change of the three-phase current imbalance is greater than a second threshold; the three-phase current imbalance is greater than the first threshold, and the rate of change of the three-phase current imbalance is less than or equal to the second threshold; and the three-phase current imbalance is less than or equal to the first threshold, and the rate of change of the three-phase current imbalance is greater than the second threshold.

[0016] Optionally, the second determining unit is also used to determine the operating state of the capacitor to be monitored as normal when the three-phase current imbalance is less than or equal to the first threshold and the rate of change of the three-phase current imbalance is less than or equal to the second threshold.

[0017] Optionally, the state monitoring device further includes: an acquisition unit. The acquisition unit is used to acquire multiple sample current information. One sample current information is the three-phase current information of a sample capacitor when it changes from a normal state to an abnormal state. The second determination unit is further used to determine multiple sample imbalances and multiple rates of change of sample imbalances corresponding to the multiple sample current information acquired by the acquisition unit. Wherein, one sample imbalance corresponds to one sample current information, and one sample current information also corresponds to one rate of change of sample imbalance. The first determination unit is further used to determine a first threshold and a second threshold based on the multiple sample imbalances and the multiple rates of change of sample imbalances.

[0018] Optionally, the first determining unit is specifically used for: the aforementioned first threshold being the product of a preset coefficient and the average of multiple sample imbalances; and the aforementioned second threshold being the product of a preset coefficient and the average of the rates of change of multiple sample imbalances.

[0019] Alternatively, the aforementioned first threshold can be the minimum of the multiple sample imbalances. The aforementioned second threshold can be the minimum of the multiple sample imbalance rates.

[0020] Optionally, the status monitoring device further includes an output unit. The output unit is used to output alarm information corresponding to the abnormal status.

[0021] Thirdly, a state monitoring device is provided, including a memory and a processor; the memory is used to store computer execution instructions, and the processor is connected to the memory via a bus; when the state monitoring device is running, the processor executes the computer execution instructions stored in the memory to cause the state monitoring device to perform the state monitoring method as described in the first aspect.

[0022] The status monitoring device can be a network device or a component of a network device, such as a chip system within the network device. This chip system supports the network device in implementing the functions involved in the first aspect and any of its possible implementations, such as receiving, determining, and routing the data and / or information involved in the aforementioned data processing method. The chip system includes a chip, but may also include other discrete devices or circuit structures.

[0023] Fourthly, a computer-readable storage medium is provided, characterized in that the computer-readable storage medium includes computer-executable instructions, which, when executed on a computer, cause the computer to perform the state monitoring method as described in the first aspect.

[0024] It should be noted that the aforementioned computer instructions may be stored, in whole or in part, on the first computer-readable storage medium. The first computer-readable storage medium may be packaged together with the processor of the state monitoring device, or it may be packaged separately from the processor of the state monitoring device; this application does not impose any limitations on this.

[0025] In this application, the name of the aforementioned status monitoring device does not limit the device or functional module itself. In actual implementation, these devices or functional modules may appear under other names. As long as the function of each device or functional module is similar to that of this application, it falls within the scope of the claims of this application and its equivalents.

[0026] These or other aspects of this application will become more readily apparent in the following description.

[0027] The technical solution provided in this application brings at least the following beneficial effects:

[0028] Based on any of the above aspects, in this application, after determining the three-phase current imbalance degree and the rate of change of the three-phase current imbalance degree of the capacitor to be monitored, the operating state of the capacitor to be monitored can be determined to be abnormal when the three-phase current imbalance degree and the rate of change of the three-phase current imbalance degree meet preset conditions. Compared with the conventional method of relying on manual inspection, in the embodiments provided in this application, the state detection device can acquire the operating information of the capacitor in real time, and combine the two indicators of three-phase current imbalance degree and the rate of change of the three-phase current imbalance degree to judge the operating state of the capacitor, achieving the effect of timely and accurate monitoring of the operating state of the capacitor, and avoiding the problems of missed detection and false detection caused by manual inspection. Therefore, this application can improve the accuracy of monitoring the operating state of the capacitor. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a condition monitoring system provided in an embodiment of this application;

[0030] Figure 2 This is a schematic diagram of the hardware structure of the status monitoring device provided in the embodiments of this application;

[0031] Figure 3 A flowchart illustrating a state monitoring method provided in this application embodiment. Figure 1 ;

[0032] Figure 4 A flowchart illustrating a state monitoring method provided in this application embodiment. Figure 2 ;

[0033] Figure 5 A flowchart illustrating a state monitoring method provided in this application embodiment. Figure 3 ;

[0034] Figure 6 A flowchart illustrating a state monitoring method provided in this application embodiment. Figure 4 ;

[0035] Figure 7 A flowchart illustrating a state monitoring method provided in this application embodiment. Figure 5 ;

[0036] Figure 8 This is a schematic diagram of the structure of a status monitoring device provided in an embodiment of this application. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0038] It should be noted that in the embodiments of this application, the words "exemplary" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of the words "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0039] To facilitate a clear description of the technical solutions of the embodiments of this application, the terms "first" and "second" are used in the embodiments of this application to distinguish the same or similar items with essentially the same function and effect. Those skilled in the art can understand that the terms "first" and "second" are not intended to limit the quantity or execution order.

[0040] Furthermore, the terms "comprising" and "having" in the embodiments, claims, and drawings of this application are not exclusive. For example, a process, method, system, product, or device that includes a series of steps or modules is not limited to the listed steps or modules, but may also include steps or modules not listed.

[0041] In related technologies, the main reliance is on manual, periodic inspections of the power room where these capacitors are operating to determine if there are any problems such as capacitor leakage or deformation, and to eliminate potential safety hazards.

[0042] However, this method of relying on manual inspection makes the safety detection of capacitors depend on the professional skills and conscientiousness of the personnel. As a result, the management platform of the low-voltage power supply and distribution system cannot detect problems such as capacitor leakage and deformation in a timely manner, and it is easy to miss or misdetect, which greatly affects the safe operation of the power room.

[0043] To address the aforementioned problems, this application provides a state monitoring method. After determining the three-phase current imbalance and the rate of change of the three-phase current imbalance of the capacitor to be monitored, the method can determine that the operating state of the capacitor to be monitored is abnormal when the three-phase current imbalance and the rate of change of the three-phase current imbalance meet preset conditions. Compared to the conventional method that relies on manual inspection, the state detection device provided in this application can acquire the capacitor's operating information in real time and combine the two indicators of three-phase current imbalance and the rate of change of the three-phase current imbalance to determine the capacitor's operating state. This achieves timely and accurate monitoring of the capacitor's operating state, avoiding problems such as missed detections and false detections caused by manual inspection. Therefore, this application can improve the accuracy of monitoring the operating state of capacitors.

[0044] This condition monitoring method is applicable to condition monitoring systems. Figure 1 One structure of this condition monitoring system is shown. For example... Figure 1 As shown, the condition monitoring system 100 includes: a condition monitoring device 101, a transmission device 102, multiple data acquisition devices 103, and multiple capacitors 104 to be monitored. The condition monitoring device 101 and the transmission device 102 are communicatively connected. The transmission device 102 is communicatively connected to each of the multiple data acquisition devices 103. Each data acquisition device 103 is connected to one capacitor 104 to be monitored.

[0045] In practical applications, the status monitoring device 101 can communicate with multiple transmission devices 102.

[0046] For ease of understanding, this application uses the communication connection between a status monitoring device 101 and a transmission device 102 as an example for illustration.

[0047] Figure 1 The capacitor 104 under monitoring is a component that stores electrical charge and energy, and is mainly used in circuits for tuning, bypassing, coupling, and filtering. Multiple capacitors 104 under monitoring can form one or more reactive power compensation cabinets for reactive power compensation in low-voltage power supply and distribution systems.

[0048] It is easy to understand that, Figure 1The multiple capacitors 104 to be monitored can also be multiple sample capacitors, so that the condition monitoring device 101 can determine parameters such as the three-phase current imbalance and the rate of change of the three-phase current imbalance when the capacitors 104 to be monitored fail.

[0049] Figure 1 The acquisition device 103 is a detection device. This detection device can be a multi-functional instrument, such as a current transformer. The acquisition device 103 is generally installed on the output side of the capacitor 104 to be monitored, that is, connected to the capacitor 104 to be monitored via a power line. It is used to convert the three-phase capacitive current of the capacitor 104 to be monitored into an electrical signal, and to send the electrical signal to the transmission device 102 in a communication message.

[0050] Figure 1 The transmission device 102 can be a communication device (e.g., a terminal) deployed in a power room where multiple capacitors 104 to be monitored are operating. It is mainly used to receive and parse communication messages carrying electrical signals sent by multiple acquisition devices 103, and send these electrical signals to the status monitoring device 101.

[0051] Optionally, the status monitoring device 101 may be configured with functional modules such as a processing module, a storage module, a display module, and an alarm module. The processing module can be used to parse communication messages carrying electrical signals sent by multiple acquisition devices 103 and identify the corresponding three-phase capacitor currents. The storage module can be used to store the three-phase capacitor currents corresponding to these electrical signals. The display module can be used to display the three-phase capacitor currents corresponding to these electrical signals. The alarm module can be used to output alarm information corresponding to the operating status of the monitored capacitor 104.

[0052] Optional, Figure 1 The status monitoring device 101 can be a terminal, a server, or other electronic devices used to monitor the operating status of the capacitor.

[0053] When the status monitoring device 101 is a terminal, both the status monitoring device 101 and the transmission device 102 can be devices that provide voice and / or data connectivity to the user, handheld devices with wireless connectivity, or other processing devices connected to a wireless modem. The wireless terminal can communicate with one or more core networks via a radio access network (RAN). The wireless terminal can be a mobile terminal, such as a computer with a mobile terminal, or a portable, pocket-sized, handheld, or computer-embedded mobile device that exchanges voice and / or data with the radio access network, such as a mobile phone, tablet computer, laptop computer, netbook, or personal digital assistant (PDA). This application embodiment does not impose any limitations on this.

[0054] When the status monitoring device 101 is a server, the server can be a single server or a server cluster consisting of multiple servers. In some embodiments, the server cluster can also be a distributed cluster. This application embodiment does not impose any limitations in this regard.

[0055] Optional, Figure 1 The condition monitoring device 101 is typically deployed outside the power room where multiple monitored capacitors 104 operate. When the condition monitoring device 101 is deployed inside the power room where multiple monitored capacitors 104 operate, the condition monitoring device 101 can also be directly connected to multiple data acquisition devices 103. In this case, the condition monitoring system 100 may not include the transmission device 102.

[0056] like Figure 2 The diagram shown is a hardware structure schematic of a status monitoring device provided in an embodiment of this application. The status monitoring device includes a processor 21, a memory 22, a communication interface 23, and a bus 24. The processor 21, memory 22, and communication interface 23 are connected via the bus 24.

[0057] Processor 21 is the control center of the status monitoring device. It can be a single processor or a collective term for multiple processing elements. For example, processor 21 can be a general-purpose central processing unit (CPU) or other general-purpose processors. Among them, the general-purpose processor can be a microprocessor or any conventional processor.

[0058] As one embodiment, processor 21 may include one or more CPUs, for example Figure 2 CPU0 and CPU1 are shown in the diagram.

[0059] The memory 22 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but is not limited thereto.

[0060] In one possible implementation, the memory 22 can exist independently of the processor 21. The memory 22 can be connected to the processor 21 via a bus 24 and is used to store instructions or program code. When the processor 21 calls and executes the instructions or program code stored in the memory 22, it can implement the status monitoring method provided in the following embodiments of this application.

[0061] In another possible implementation, the memory 22 can also be integrated with the processor 21.

[0062] Communication interface 23 is used for the status monitoring device to connect with other devices via a communication network, such as Ethernet, wireless access network, or wireless local area network (WLAN). Communication interface 23 may include a receiving unit for receiving data and a transmitting unit for sending data.

[0063] Bus 24 can be an industry standard architecture (ISA) bus, a peripheral component interconnect (PCI) bus, or an extended industry standard architecture (EISA) bus, etc. This bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 2 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0064] It should be pointed out that, Figure 2 The structure shown does not constitute a limitation on the condition monitoring device, except Figure 2In addition to the components shown, the condition monitoring device may include more or fewer components than illustrated, or combine certain components, or have different component arrangements.

[0065] like Figure 3 The diagram shown is a flowchart illustrating a state monitoring method provided in an embodiment of this application. This state monitoring method is applied to... Figure 1 The condition monitoring system shown can be composed of Figure 1 The status monitoring device shown performs this operation. For example, the hardware implementation of this status monitoring device can refer to the foregoing. Figure 2 The relevant details are not elaborated here. In some optional implementations, the state monitoring device can also be implemented in software. The software structure for state monitoring can be referenced below. Figure 8 The relevant content will not be elaborated here.

[0066] Please refer to Figure 3 The status monitoring method provided in the embodiments of this application includes: S301-S302.

[0067] S301, The condition monitoring device determines the three-phase current imbalance and the rate of change of the three-phase current imbalance of the capacitor to be monitored.

[0068] Specifically, in combination Figure 1 During the operation of a monitored capacitor, a data acquisition device connected to the capacitor can acquire the three-phase capacitive current of the capacitor in real time or periodically, and convert the three-phase capacitive current into an electrical signal. Then, the data acquisition device can send a first communication message carrying the electrical signal, the acquisition time, and a device identifier to a transmission device. Correspondingly, the transmission device can receive and parse the first communication message sent by the data acquisition device, and send a second communication message carrying the electrical signal, the acquisition time, and a device identifier to the status monitoring device.

[0069] Accordingly, the status monitoring device can receive a second communication message from the transmission equipment and parse the second communication message to obtain the electrical signal, the acquisition time, and the device identifier. Then, the status monitoring device can determine the three-phase capacitor current corresponding to the electrical signal, and identify the capacitor to be monitored through the device identifier, thereby determining the three-phase capacitor current of the capacitor to be monitored at the acquisition time.

[0070] Next, the status monitoring device can determine the three-phase current imbalance and the rate of change of the three-phase current imbalance of the capacitor under monitoring at the time of acquisition based on the three-phase capacitance current of the capacitor under monitoring at the time of acquisition. The rate of change of the three-phase current imbalance can be used to represent the change in the three-phase current imbalance at the time of acquisition compared to the change in the three-phase current imbalance at the adjacent time of acquisition.

[0071] Optionally, the three-phase capacitance current and three-phase current imbalance of the capacitor to be monitored can satisfy the first formula. The first formula is:

[0072]

[0073] in, Let I be the three-phase current imbalance of the capacitor to be monitored at time t. t最大 Let be the maximum single-phase current among the three-phase capacitor currents of the capacitor to be monitored at time t. t最小 Let t be the minimum single-phase current among the three-phase capacitor currents of the capacitor to be monitored.

[0074] Optionally, the three-phase current imbalance and the rate of change of the three-phase current imbalance of the capacitor to be monitored can satisfy the second formula. The second formula is:

[0075]

[0076] Where, δ t Let t be the rate of change of the three-phase current imbalance of the capacitor to be monitored. Let t be the three-phase current imbalance of the capacitor to be monitored.

[0077] Understandably, the second formula is used to represent the... Differentiate the time parameter t.

[0078] Optionally, the acquisition time can be used to indicate the moment when the acquisition device acquires the three-phase capacitive current of the capacitor to be monitored.

[0079] Optionally, the equipment identification can be determined by information such as the production date and serial number of the capacitor to be monitored, which is used to uniquely identify the identity information and installation location of the capacitor to be monitored, so that staff can promptly carry out testing and maintenance of the capacitor to be monitored based on the equipment identification.

[0080] S302. When the three-phase current imbalance and the rate of change of the three-phase current imbalance meet the preset conditions, the condition monitoring device determines that the operating state of the capacitor to be monitored is abnormal.

[0081] Specifically, after determining the three-phase current imbalance and the rate of change of the three-phase current imbalance of the capacitor under test, in order to accurately determine the operating state of the capacitor under test, the condition monitoring device can compare the three-phase current imbalance with a first threshold and compare the rate of change of the three-phase current imbalance with a second threshold. When the three-phase current imbalance and the rate of change of the three-phase current imbalance meet preset conditions, the condition monitoring device can determine that the operating state of the capacitor under test is abnormal.

[0082] The preset conditions include: the three-phase current imbalance is greater than a first threshold and the rate of change of the three-phase current imbalance is greater than a second threshold; the three-phase current imbalance is greater than the first threshold and the rate of change of the three-phase current imbalance is less than or equal to the second threshold; and the three-phase current imbalance is less than or equal to the first threshold and the rate of change of the three-phase current imbalance is greater than the second threshold.

[0083] In this way, when the three-phase current imbalance is greater than the first threshold, or when the rate of change of the three-phase current imbalance is greater than the second threshold, the condition monitoring device can determine that the three-phase current imbalance and the rate of change of the three-phase current imbalance meet the preset conditions, thereby accurately determining that the operating state of the capacitor to be monitored is abnormal.

[0084] Optionally, the first threshold can be used to represent the upper limit of the three-phase current imbalance under safe operation of the capacitor under monitoring. The first threshold can be determined based on the critical value of the three-phase current imbalance when the sample capacitor fails. Alternatively, the first threshold can also be set manually based on experience. This application does not limit this.

[0085] Optionally, the second threshold can be used to represent the upper limit of the rate of change of the three-phase current imbalance under safe operation of the capacitor under monitoring. The second threshold can be determined based on the critical value of the rate of change of the three-phase current imbalance when the sample capacitor fails. Alternatively, the second threshold can also be set manually based on experience. This application does not limit this.

[0086] In one possible implementation, when the three-phase current imbalance and the rate of change of the three-phase current imbalance do not meet preset conditions, based on Figure 3 The illustrated method embodiment provides a possible implementation, such as... Figure 4 As shown, it includes: S401.

[0087] S401. When the three-phase current imbalance is less than or equal to the first threshold and the rate of change of the three-phase current imbalance is less than or equal to the second threshold, the condition monitoring device determines that the operating state of the capacitor to be monitored is normal.

[0088] Specifically, after comparing the three-phase current imbalance with the first threshold and the rate of change of the three-phase current imbalance with the second threshold, when the three-phase current imbalance is less than or equal to the first threshold and the rate of change of the three-phase current imbalance is less than or equal to the second threshold, the condition monitoring device can determine that the operating state of the capacitor to be monitored is normal, thereby reducing the possibility of false detection.

[0089] In one possible implementation, to reasonably set the first threshold and the second threshold, this embodiment provides a possible implementation method, such as... Figure 5 As shown, it includes: S501-S503.

[0090] S501, the condition monitoring device acquires multiple sample current information.

[0091] Specifically, in combination Figure 1 In a condition monitoring system, multiple capacitors under monitoring can also be considered as multiple sample capacitors. In this case, the condition monitoring device can acquire the three-phase capacitive current of each sample capacitor at multiple sample times and store it in a configured storage module. Next, the condition monitoring device can determine the candidate unbalance and the rate of change of the candidate unbalance for each sample capacitor at multiple sample times, and plot the candidate unbalance curve and the rate of change curve of the candidate unbalance for each sample capacitor.

[0092] Next, when a candidate imbalance curve of a sample capacitor exhibits abrupt changes or fluctuations, or when the rate of change curve of a candidate imbalance of a sample capacitor exhibits abrupt changes or fluctuations, the status monitoring device can send an alert email to the staff's mailbox via its configured alarm module. Correspondingly, staff can receive the alert email through terminals or other devices and become aware of the abnormality in that sample capacitor, thus enabling them to promptly investigate whether the sample capacitor has any faults such as leakage or deformation.

[0093] Next, when a fault such as leakage or deformation is confirmed in a sample capacitor, the operator can input a confirmation message through the input module of the condition monitoring device, indicating that the abnormal situation is a fault. Correspondingly, the condition monitoring device receives this confirmation message, thus determining that the sample capacitor has changed from a normal state to an abnormal state, and identifies the three-phase capacitor current at the time of the abnormal situation as a sample current information. In this way, the condition monitoring device can acquire multiple sample current information by continuously monitoring the operating status of multiple sample capacitors.

[0094] One sample current information is the three-phase current information of a sample capacitor when it changes from a normal state to an abnormal state.

[0095] Optionally, the method by which the condition monitoring device acquires the three-phase capacitive current of each sample capacitor at multiple sample times can refer to the method in S301 for the condition monitoring device to determine the three-phase capacitive current of a capacitor to be monitored at the acquisition time. This will not be elaborated further here.

[0096] Optionally, multiple sample times can be multiple consecutive times.

[0097] Optionally, the status monitoring device may be equipped with an input module. This input module may be a keyboard, touch screen, etc.

[0098] S502, The condition monitoring device determines the unbalance of multiple samples and the rate of change of the unbalance of multiple samples corresponding to multiple sample current information.

[0099] Specifically, after acquiring multiple sample current information, the state monitoring device can determine multiple candidate unbalance degrees corresponding one-to-one with the multiple sample current information as multiple sample unbalance degrees corresponding one-to-one with the multiple sample current information, and determine the rate of change of the multiple candidate unbalance degrees corresponding one-to-one with the multiple sample current information as the rate of change of the multiple sample unbalance degrees corresponding one-to-one with the multiple sample current information, thereby determining the critical threshold of multiple sample capacitors when a fault occurs.

[0100] In this system, one sample imbalance corresponds to one sample current information. A sample current information also corresponds to the rate of change of one sample imbalance.

[0101] S503, the state monitoring device determines a first threshold and a second threshold based on the imbalance of multiple samples and the rate of change of the imbalance of multiple samples.

[0102] The first threshold is the product of a preset coefficient and the average of the imbalance degrees of multiple samples. The second threshold is the product of the preset coefficient and the average of the rates of change of the imbalance degrees of multiple samples.

[0103] Alternatively, the first threshold can be the minimum of the imbalance values ​​among multiple samples. The second threshold can be the minimum of the rates of change of the imbalance values ​​among multiple samples.

[0104] Specifically, the state monitoring device determines the first threshold and the second threshold based on the imbalance of multiple samples and the rate of change of the imbalance of multiple samples in the following ways, including but not limited to the following two methods.

[0105] The first method is:

[0106] The state monitoring device can first determine the average value of the imbalance of multiple samples and the average value of the rate of change of the imbalance of multiple samples, then determine the first threshold by multiplying the average value of the imbalance of multiple samples and a preset coefficient, and determine the second threshold by multiplying the average value of the rate of change of the imbalance of multiple samples and a preset coefficient.

[0107] Optionally, to improve the operational safety of the power room where the monitored capacitor operates, the preset coefficient can be a value greater than 0 and less than 1, so that the status monitoring device can confirm the abnormal state of the monitored capacitor before a fault occurs based on the first threshold and the second threshold. For example, the preset coefficient can be 0.9.

[0108] The second method is:

[0109] The state monitoring device can first sort the imbalance of multiple samples and the rate of change of the imbalance of multiple samples in ascending order, then determine the minimum value among the imbalance of multiple samples as the first threshold, and the minimum value among the rate of change of the imbalance of multiple samples as the second threshold.

[0110] In this way, the condition monitoring device can identify the abnormal state of the capacitor under monitoring before the capacitor fails, based on the first threshold and the second threshold.

[0111] In one possible implementation, in S503 above, when the state monitoring device determines the first threshold and the second threshold based on the imbalance of multiple samples and the rate of change of the imbalance of multiple samples, it is based on... Figure 5 The illustrated method embodiment provides a possible implementation, such as... Figure 6 As shown, it includes: S601-S602.

[0112] S601, the state monitoring device determines the average value of the imbalance of multiple samples as the target imbalance, and the average value of the rate of change of the imbalance of multiple samples as the rate of change of the target imbalance.

[0113] S602, The condition monitoring device determines the product of the target imbalance degree and the preset coefficient as the first threshold, and the product of the rate of change of the target imbalance degree and the preset coefficient as the second threshold.

[0114] In one possible approach, after determining that the operating state of the capacitor to be monitored is abnormal, based on Figure 3 The illustrated method embodiment provides a possible implementation, such as... Figure 7 As shown, it includes: S701.

[0115] S701, The status monitoring device outputs alarm information corresponding to the abnormal status.

[0116] Specifically, once the operating status of the capacitor to be monitored is determined to be abnormal, the status monitoring device can output alarm information corresponding to the abnormal status, thereby promptly reminding staff to repair or replace the capacitor to be monitored in order to eliminate potential safety hazards.

[0117] Optionally, the status monitoring device may output alarm information corresponding to abnormal states by sending emails to pre-stored staff email addresses, sounding alarm bells, or displaying the alarm information on a display device configured on the status monitoring device. This application embodiment does not limit this method.

[0118] In this embodiment, after determining the three-phase current imbalance and the rate of change of the three-phase current imbalance of the capacitor to be monitored, the operating state of the capacitor to be monitored can be determined to be abnormal when the three-phase current imbalance and the rate of change of the three-phase current imbalance meet preset conditions. Compared with the conventional method of relying on manual inspection, in the embodiment provided by this application, the state detection device can acquire the operating information of the capacitor in real time and judge the operating state of the capacitor by combining the two indicators of three-phase current imbalance and the rate of change of the three-phase current imbalance. This achieves the effect of timely and accurate monitoring of the operating state of the capacitor, avoiding the problems of missed detection and false detection caused by manual inspection. Therefore, this application can improve the accuracy of monitoring the operating state of the capacitor.

[0119] The foregoing mainly describes the solutions provided by the embodiments of this application from a methodological perspective. To achieve the above functions, it includes corresponding hardware structures and / or software modules for executing each function. Those skilled in the art should readily recognize that, based on the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0120] This application embodiment can divide the status monitoring device into functional modules according to the above method example. For example, each function can be divided into its own functional module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware or as a software functional module. Optionally, the module division in this application embodiment is illustrative and only represents one logical functional division; other division methods may be used in actual implementation.

[0121] like Figure 8 The diagram shown is a structural schematic of a condition monitoring device provided in an embodiment of this application. This condition monitoring device can be used to perform actions such as... Figures 3 to 7 The status monitoring method shown. Figure 8 The condition monitoring device shown belongs to a condition monitoring system that includes a condition monitoring device, a transmission device, multiple acquisition devices, and multiple capacitors to be monitored. The condition monitoring device includes: a first determination unit 801 and a second determination unit 802.

[0122] The first determining unit 801 is used to determine the three-phase current imbalance and the rate of change of the three-phase current imbalance of the capacitor to be monitored. For example, combined with Figure 3The first determining unit 801 can be used to execute S301.

[0123] The second determining unit 802 is also used to determine the operating state of the capacitor to be monitored as abnormal when the three-phase current imbalance and the rate of change of the three-phase current imbalance meet preset conditions. For example, combined with Figure 3 The second determining unit 802 can be used to execute S302.

[0124] Optionally, the aforementioned preset conditions include: the three-phase current imbalance is greater than a first threshold, and the rate of change of the three-phase current imbalance is greater than a second threshold; the three-phase current imbalance is greater than the first threshold, and the rate of change of the three-phase current imbalance is less than or equal to the second threshold; and the three-phase current imbalance is less than or equal to the first threshold, and the rate of change of the three-phase current imbalance is greater than the second threshold.

[0125] Optionally, the second determining unit 802 is further configured to determine the operating state of the capacitor to be monitored as normal when the three-phase current imbalance is less than or equal to a first threshold and the rate of change of the three-phase current imbalance is less than or equal to a second threshold. For example, in combination with Figure 4 The second determining unit 802 can be used to execute S401.

[0126] Optionally, the state monitoring device further includes an acquisition unit 803. The acquisition unit 803 is used to acquire multiple sample current information. Each sample current information is the three-phase current information of a sample capacitor when it transitions from a normal state to an abnormal state. For example, combined with... Figure 5 The acquisition unit 803 can be used to execute S501.

[0127] The first determining unit 801 is further configured to determine multiple sample imbalances and multiple rates of change of sample imbalances corresponding to the multiple sample current information acquired by the acquiring unit 803. Specifically, one sample imbalance corresponds to one sample current information, and one sample current information also corresponds to one rate of change of sample imbalance. For example, combined with... Figure 5 The first determining unit 801 can be used to execute S502.

[0128] The first determining unit 801 is further configured to determine a first threshold and a second threshold based on the imbalance of multiple samples and the rate of change of the imbalance of multiple samples. For example, combining Figure 5 The first determining unit 801 can be used to execute S503.

[0129] Optionally, the aforementioned first threshold is the product of a preset coefficient and the average of the imbalance degrees of multiple samples. The aforementioned second threshold is the product of a preset coefficient and the average of the rates of change of the imbalance degrees of multiple samples.

[0130] Alternatively, the aforementioned first threshold can be the minimum of the multiple sample imbalances. The aforementioned second threshold can be the minimum of the multiple sample imbalance rates.

[0131] Optionally, the status monitoring device further includes an output unit 804. The output unit 804 is used to output alarm information corresponding to the abnormal status. For example, in conjunction with... Figure 7 The output unit 804 can be used to execute S701.

[0132] Those skilled in the art will recognize that, in one or more of the examples above, the functions described in this application can be implemented using hardware, software, firmware, or any combination thereof. When implemented in software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or code on a computer-readable medium. Computer-readable media include computer-readable storage media and communication media, wherein communication media include any medium that facilitates the transmission of a computer program from one place to another. Storage media can be any available medium accessible to a general-purpose or special-purpose computer.

[0133] Through the above description of the embodiments, those skilled in the art can clearly understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0134] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and other division methods may exist in actual implementation. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms. Units described as separate components may or may not be physically separate; components shown as units may be one physical unit or multiple physical units, i.e., they may be located in one place or distributed in multiple different places. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0135] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A condition monitoring method characterized by, The state monitoring method is executed by a state monitoring device, and the state monitoring method comprises: determining the three-phase current imbalance degree and the change rate of the three-phase current imbalance degree of the capacitor to be monitored; the three-phase current imbalance degree is the ratio of the difference between the maximum value and the minimum value of the single-phase current at time t and the minimum value of the single-phase current; when the three-phase current imbalance degree and the change rate of the three-phase current imbalance degree meet the preset condition, determining that the running state of the capacitor to be monitored is an abnormal state; the preset condition includes that the three-phase current imbalance degree is less than or equal to a first threshold value, and the change rate of the three-phase current imbalance degree is greater than a second threshold value; obtaining a plurality of sample current information; one sample current information is the three-phase current information when one sample capacitor is converted from a normal state to the abnormal state; determining a plurality of sample imbalance degrees and a plurality of sample imbalance degree change rates corresponding to the plurality of sample current information; wherein one sample imbalance degree corresponds to one sample current information, and the one sample current information also corresponds to the change rate of the one sample imbalance degree; determining the first threshold value and the second threshold value according to the plurality of sample imbalance degrees and the plurality of sample imbalance degree change rates; the first threshold value is the product of a preset coefficient and the average value of the plurality of sample imbalance degrees; the second threshold value is the product of the preset coefficient and the average value of the plurality of sample imbalance degree change rates; or, the first threshold value is the minimum value of the plurality of sample imbalance degrees; the second threshold value is the minimum value of the plurality of sample imbalance degree change rates.

2. The condition monitoring method of claim 1, wherein, Further comprising: when the three-phase current imbalance degree is less than or equal to the first threshold value, and the change rate of the three-phase current imbalance degree is less than or equal to the second threshold value, determining that the running state of the capacitor to be monitored is a normal state.

3. The condition monitoring method according to any of claims 1-2, characterized by, Further comprising: outputting alarm information corresponding to the abnormal state.

4. A condition monitoring device characterised in that, Comprising: an acquisition unit, a first determination unit and a second determination unit; the first determination unit is configured to determine the three-phase current imbalance degree and the change rate of the three-phase current imbalance degree of the capacitor to be monitored; the three-phase current imbalance degree is the ratio of the difference between the maximum value and the minimum value of the single-phase current at time t and the minimum value of the single-phase current; the second determination unit is further configured to determine that the running state of the capacitor to be monitored is an abnormal state when the three-phase current imbalance degree and the change rate of the three-phase current imbalance degree meet the preset condition; the preset condition includes that the three-phase current imbalance degree is less than or equal to a first threshold value, and the change rate of the three-phase current imbalance degree is greater than a second threshold value; the acquisition unit is configured to obtain a plurality of sample current information; one sample current information is the three-phase current information when one sample capacitor is converted from a normal state to the abnormal state; the first determination unit is further configured to determine a plurality of sample imbalance degrees and a plurality of sample imbalance degree change rates corresponding to the plurality of sample current information obtained by the acquisition unit; wherein one sample imbalance degree corresponds to one sample current information, and the one sample current information also corresponds to the change rate of the one sample imbalance degree; The first determining unit is further configured to determine the first threshold and the second threshold according to the plurality of sample imbalance degrees and the plurality of sample imbalance degree change rates; The first threshold is a product of a preset coefficient and an average of the plurality of sample imbalance degrees; and the second threshold is a product of the preset coefficient and an average of the plurality of sample imbalance degree change rates. Alternatively, the first threshold is a minimum value of the plurality of sample imbalance degrees; and the second threshold is a minimum value of the plurality of sample imbalance degree change rates.

5. The state monitoring apparatus according to claim 4, wherein The second determining unit is further configured to determine that the running state of the capacitor to be monitored is a normal state when the three-phase current imbalance degree is less than or equal to the first threshold and the three-phase current imbalance degree change rate is less than or equal to the second threshold.

6. A condition monitoring apparatus according to any of claims 4-5, characterised in that, Further comprising: an output unit; The output unit is configured to output alarm information corresponding to the abnormal state.

7. A condition monitoring device, characterised in that, The state monitoring apparatus comprises a memory and a processor; the memory is configured to store computer execution instructions; the processor is connected to the memory through a bus; when the state monitoring apparatus is running, the processor executes the computer execution instructions stored in the memory, so that the state monitoring apparatus executes the state monitoring method according to any one of claims 1-3.

8. A computer-readable storage medium, characterized in that, The computer readable storage medium comprises computer execution instructions; when the computer execution instructions are running on a computer, the computer executes the state monitoring method according to any one of claims 1-3.

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