Fault monitoring method and system for power distribution cabinet

Abstract

The invention relates to the technical field of fault monitoring, in particular to a fault monitoring method and system for a power distribution cabinet. A power distribution cabinet environment classification module obtains power distribution cabinet environment parameters, calculates power distribution cabinet environment influence tendency parameters according to the power distribution cabinet environment parameters, and divides environment influence categories; the strategy selection unit selects a power distribution cabinet fault monitoring strategy according to the environmental influence category, including obtaining vibration signals in the operation process of each device and the gas concentration in the power distribution cabinet, extracting a feature abnormal interval, and determining whether the power distribution cabinet has a fault; or the current value in the power distribution cabinet is acquired in real time, a monitoring strategy is selected according to the current value, and whether the power distribution cabinet has a fault is judged, the influence of the environment on operation of the power distribution cabinet and the influence of the environment on the accuracy of data acquisition in the operation process of the power distribution cabinet are considered, and therefore the reliability of power distribution cabinet fault monitoring is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fault monitoring, and in particular to a fault monitoring method and system for a power distribution cabinet. Background Art

[0002] As a key part of the power system, the distribution cabinet undertakes the important task of power distribution and supply. The progress and development of the power system is directly related to people's quality of life. Therefore, the safe operation of the distribution cabinet is crucial to ensure the stability of the power system.

[0003] Chinese Patent Publication No.: CN118889684A A fault monitoring system for a power distribution cabinet includes: a data acquisition module, which is used to collect the working condition information of the power distribution cabinet, wherein the working condition information at least includes: partial discharge information inside the power distribution cabinet, voltage information of the power distribution cabinet, temperature information of the cable, current information of the power distribution cabinet, and temperature and humidity information inside the power distribution cabinet; a data processing module, which interacts with the data acquisition module, and the data processing module is used to receive the working condition information and generate prompt information based on the working condition information, and the prompt information is used to characterize whether the working condition parameters of the power distribution cabinet are normal. The above-mentioned monitoring system can comprehensively monitor the various data of the power distribution cabinet and promptly discover the faults of the power distribution cabinet, thereby improving the safety performance of the power distribution cabinet.

[0004] However, in the prior art, the impact of the environment on the operation of the distribution cabinet and the impact of the environment on the accuracy of data obtained during the operation of the distribution cabinet are not considered, resulting in low reliability of fault monitoring of the distribution cabinet.

[0005] Therefore, there is an urgent need for a fault monitoring method and system for a distribution cabinet, which can consider the impact of the environment on the operation of the distribution cabinet, as well as the impact of the environment on the accuracy of data obtained during the operation of the distribution cabinet, so as to improve the reliability of fault monitoring of the distribution cabinet. Summary of the invention

[0006] The purpose of the present invention is to provide a fault monitoring method and system for a distribution cabinet, which can take into account the impact of the environment on the operation of the distribution cabinet, and the impact of the environment on the accuracy of data obtained during the operation of the distribution cabinet, thereby improving the reliability of fault monitoring of the distribution cabinet.

[0007] In one aspect, the present invention provides a fault monitoring system for a power distribution cabinet, comprising:

[0008] The data acquisition module includes a vibration acquisition unit arranged on a plurality of devices in the power distribution cabinet to acquire vibration signals of each of the devices during operation, wherein the plurality of devices include a circuit breaker, a capacitor, and a current transformer, a gas concentration acquisition unit arranged in the power distribution cabinet to acquire gas concentration in the power distribution cabinet, and an image acquisition unit arranged in the power distribution cabinet to acquire images in the power distribution cabinet;

[0009] The distribution cabinet environment classification module is used to obtain the distribution cabinet environment parameters, including wind speed, temperature and humidity, calculate the distribution cabinet environment impact tendency parameters according to the distribution cabinet environment parameters, and classify the environmental impact categories;

[0010] A host computer, connected to each of the data acquisition modules and the distribution cabinet environment classification module, includes a strategy selection unit and a display unit;

[0011] The strategy selection unit is used to select a distribution cabinet fault monitoring strategy according to the environmental impact category, including:

[0012] Obtain the vibration signal during the operation of each of the devices and the gas concentration in the power distribution cabinet, extract the characteristic abnormal interval, and determine whether there is a fault in the power distribution cabinet;

[0013] Or, obtain the current value in the distribution cabinet in real time, and select a monitoring strategy based on the current value, including obtaining the gas concentration in the distribution cabinet and the image in the distribution cabinet to determine whether there is a fault in the distribution cabinet, or perform signal separation processing on the vibration signal through digital filtering, and determine whether there is a fault in the distribution cabinet based on the separated vibration signal;

[0014] The display unit is used to display the determination result of the strategy selection unit.

[0015] The distribution cabinet environment classification module calculates the distribution cabinet environment impact tendency parameter according to the distribution cabinet environment parameter.

[0016] Obtain environmental parameters of the power distribution cabinet;

[0017] The difference between the calculated wind speed and the standard wind speed threshold is recorded as the wind speed deviation, the absolute value of the difference between the calculated temperature and the standard temperature threshold is recorded as the temperature deviation, and the absolute value of the difference between the calculated humidity and the standard humidity threshold is recorded as the humidity deviation;

[0018] The ratio of the wind speed deviation to the standard wind speed threshold is recorded as the wind speed influence tendency parameter, the ratio of the temperature deviation to the standard temperature threshold is recorded as the temperature influence tendency parameter, and the ratio of the humidity deviation to the standard humidity threshold is recorded as the humidity influence tendency parameter;

[0019] The wind speed influence tendency parameter, temperature influence tendency parameter and humidity influence tendency parameter are weightedly summed to obtain the distribution cabinet environment influence tendency parameter.

[0020] The distribution cabinet environment classification module divides the environmental impact categories.

[0021] Compare the distribution cabinet environmental impact tendency parameter with the preset distribution cabinet environmental impact tendency parameter comparison threshold,

[0022] If the distribution cabinet environmental impact tendency parameter is less than the preset distribution cabinet environmental impact tendency parameter comparison threshold, the environmental impact category is classified as a weak tendency environmental impact category;

[0023] If the distribution cabinet environmental impact tendency parameter is greater than or equal to the preset distribution cabinet environmental impact tendency parameter comparison threshold, the environmental impact category is classified as a strong tendency environmental impact category.

[0024] The strategy selection unit is used to select a distribution cabinet fault monitoring strategy according to the environmental impact category, wherein:

[0025] If the environmental impact category is a weak tendency environmental impact category, the vibration signal during the operation of each of the devices and the gas concentration in the distribution cabinet are obtained, the characteristic abnormal interval is extracted, and it is determined whether there is a fault in the distribution cabinet;

[0026] If the environmental impact category is a strong tendency environmental impact category, the current value in the distribution cabinet is obtained in real time, and a monitoring strategy is selected based on the current value, including obtaining the gas concentration in the distribution cabinet and the image inside the distribution cabinet to determine whether there is a fault in the distribution cabinet, or performing signal separation processing on the vibration signal through digital filtering, and determining whether there is a fault in the distribution cabinet based on the separated vibration signal.

[0027] The strategy selects the unit to extract the characteristic abnormal interval,

[0028] Obtain the vibration signal during the operation of each of the devices and the gas concentration in the distribution cabinet,

[0029] If the first preset condition is met, a preset time interval segment containing the amplitude change value of the vibration signal is extracted or a preset time interval segment containing the gas concentration change value is extracted, and the preset time interval segment is a characteristic abnormal interval;

[0030] The first preset condition is that the vibration signal amplitude change value is greater than a preset amplitude change value threshold, or the gas concentration change is greater than a preset gas concentration change threshold.

[0031] The strategy selection unit determines whether there is a fault in the power distribution cabinet.

[0032] Obtain the vibration signal amplitude within the characteristic abnormal range and the gas concentration in the distribution cabinet within the characteristic abnormal range.

[0033] Compare the vibration signal amplitude with the preset amplitude comparison threshold, and compare the gas concentration in the distribution cabinet with the preset gas concentration comparison threshold.

[0034] If the amplitude of the vibration signal is greater than a preset amplitude comparison threshold, or the gas concentration in the distribution cabinet is greater than a preset gas concentration comparison threshold, it is determined that the distribution cabinet is faulty.

[0035] The strategy selection unit selects a monitoring strategy according to the current value.

[0036] Compare the current value with the preset current value comparison threshold,

[0037] If the current value is greater than the preset current value comparison threshold, the vibration signal is separated by digital filtering, and it is determined whether the power distribution cabinet is faulty based on the separated vibration signal;

[0038] If the current value is less than or equal to the preset current value comparison threshold, the gas concentration in the distribution cabinet and the image inside the distribution cabinet are obtained to determine whether there is a fault in the distribution cabinet.

[0039] The strategy selection unit obtains the gas concentration in the distribution cabinet and the image in the distribution cabinet to determine whether there is a fault in the distribution cabinet.

[0040] Compare the image inside the power distribution cabinet with the operating image of the standard power distribution cabinet to obtain the similarity value.

[0041] If the gas concentration in the power distribution cabinet is greater than a preset gas concentration comparison threshold, or the similarity value is less than a preset similarity value comparison threshold, it is determined that there is a fault in the power distribution cabinet.

[0042] The strategy selection unit performs signal separation processing on the vibration signal through digital filtering, and determines whether there is a fault in the power distribution cabinet according to the separated vibration signal.

[0043] The vibration signals of the equipment are separated and processed by digital filtering during operation.

[0044] Get the vibration signal after separation and processing,

[0045] If the amplitude of the vibration signal during the operation of the equipment is greater than the preset amplitude comparison threshold, it is determined that there is a fault in the distribution cabinet.

[0046] In another aspect, the present invention provides a fault monitoring method for a power distribution cabinet, comprising:

[0047] Step S1, collecting vibration signals during the operation of several devices in the distribution cabinet, the several devices including circuit breakers, capacitors and current transformers, collecting gas concentration in the distribution cabinet, and obtaining an image in the distribution cabinet;

[0048] Step S2, obtaining the environmental parameters of the power distribution cabinet, the environmental parameters including wind speed, temperature and humidity, calculating the environmental impact tendency parameters of the power distribution cabinet according to the environmental parameters of the power distribution cabinet, and dividing the environmental impact categories;

[0049] Step S3, selecting a distribution cabinet fault monitoring strategy according to the environmental impact category, including:

[0050] Obtain the vibration signal during the operation of each of the devices and the gas concentration in the power distribution cabinet, extract the characteristic abnormal interval, and determine whether there is a fault in the power distribution cabinet;

[0051] Or, obtain the current value in the distribution cabinet in real time, and select a monitoring strategy based on the current value, including obtaining the gas concentration in the distribution cabinet and the image in the distribution cabinet to determine whether there is a fault in the distribution cabinet, or perform signal separation processing on the vibration signal through digital filtering, and determine whether there is a fault in the distribution cabinet based on the separated vibration signal;

[0052] Step S4, displaying the determination result.

[0053] The beneficial effects of the present invention are:

[0054] The present invention provides a fault monitoring method and system for a distribution cabinet, which obtains environmental parameters of the distribution cabinet to calculate the environmental impact tendency parameters of the distribution cabinet, divides the environmental impact categories, and a strategy selection unit selects a distribution cabinet fault monitoring strategy according to the environmental impact categories, thereby adopting different strategies for fault monitoring of the distribution cabinet and improving the reliability of fault monitoring of the distribution cabinet.

[0055] Furthermore, the distribution cabinet environment classification module of the present invention calculates the distribution cabinet environment impact tendency parameters based on the distribution cabinet environment parameters. In actual situations, environmental factors will affect the operation of the distribution cabinet. Wind speed, temperature and humidity are important influencing parameters that affect the operation of the distribution cabinet. By calculating the distribution cabinet environment impact tendency parameters based on wind speed, temperature and humidity, the stability of the distribution cabinet operation can be characterized to a certain extent, thereby adopting different strategies for the fault monitoring of the distribution cabinet and improving the reliability of the distribution cabinet fault monitoring.

[0056] Furthermore, the strategy selection unit of the present invention obtains the vibration signal during the operation of each of the above-mentioned devices and the gas concentration in the distribution cabinet, extracts the characteristic abnormal interval, and determines whether there is a fault in the distribution cabinet. The distribution cabinet may fail due to equipment aging, equipment corrosion and other reasons during the operation of the equipment. The vibration signal of each device during operation and the gas concentration in the distribution cabinet are important characterization parameters for characterizing whether there is an abnormality in the equipment. When there is an abnormality in the equipment, the vibration signal during the operation of the equipment is also abnormal accordingly. Therefore, by obtaining the vibration signal of each device during operation and the gas concentration in the distribution cabinet, it is possible to monitor whether there is a fault in the distribution cabinet, thereby ensuring the reliability of the monitoring results while making the monitoring relatively simple.

[0057] Furthermore, the strategy selection unit of the present invention performs signal separation processing on the vibration signal through digital filtering, and determines whether there is a fault in the distribution cabinet based on the separated vibration signal. In actual situations, there may be the influence of environmental factors such as strong winds or earthquakes, and the vibration signals of various equipment in the distribution cabinet during operation may be disturbed, resulting in the obtained vibration signals of various equipment in the distribution cabinet during operation unable to truly reflect the operation status of various equipment in the distribution cabinet. By adopting the digital filtering method to eliminate the influence of the environment on the vibration signals of each equipment, the reliability of distribution cabinet fault monitoring can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 is a structural diagram of a fault monitoring system for a power distribution cabinet in an embodiment of the present invention;

[0059] Figure 2 This is a structural diagram of the host computer in an embodiment of the present invention;

[0060] Figure 3 A logical decision diagram for classifying environmental impact categories in an embodiment of the present invention;

[0061] Figure 4 This is a step diagram of a fault monitoring method for a power distribution cabinet in an embodiment of the present invention. DETAILED DESCRIPTION

[0062] The technical solution of the present invention will be described clearly and completely below 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 the present invention.

[0063] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0064] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0066] like Figure 1-Figure 3 As shown, this embodiment provides a fault monitoring system for a power distribution cabinet, including:

[0067] The data acquisition module includes a vibration acquisition unit arranged on a plurality of devices in the power distribution cabinet to acquire vibration signals of each of the devices during operation, wherein the plurality of devices include a circuit breaker, a capacitor, and a current transformer, a gas concentration acquisition unit arranged in the power distribution cabinet to acquire gas concentration in the power distribution cabinet, and an image acquisition unit arranged in the power distribution cabinet to acquire images in the power distribution cabinet;

[0068] The distribution cabinet environment classification module is used to obtain the distribution cabinet environment parameters, including wind speed, temperature and humidity, calculate the distribution cabinet environment impact tendency parameters according to the distribution cabinet environment parameters, and classify the environmental impact categories;

[0069] A host computer, connected to each of the data acquisition modules and the distribution cabinet environment classification module, includes a strategy selection unit and a display unit;

[0070] The strategy selection unit is used to select a distribution cabinet fault monitoring strategy according to the environmental impact category, including:

[0071] Obtain the vibration signal during the operation of each of the devices and the gas concentration in the power distribution cabinet, extract the characteristic abnormal interval, and determine whether there is a fault in the power distribution cabinet;

[0072] Or, obtain the current value in the distribution cabinet in real time, and select a monitoring strategy based on the current value, including obtaining the gas concentration in the distribution cabinet and the image in the distribution cabinet to determine whether there is a fault in the distribution cabinet, or perform signal separation processing on the vibration signal through digital filtering, and determine whether there is a fault in the distribution cabinet based on the separated vibration signal;

[0073] The display unit is used to display the determination result of the strategy selection unit.

[0074] In this embodiment, the vibration acquisition unit may be a vibration sensor, the gas concentration acquisition unit may be a gas sensor, the gas sensor needs to obtain the gas concentrations of sulfur hexafluoride and ozone in the distribution cabinet, and the image acquisition unit may be an industrial CCD camera.

[0075] The distribution cabinet environment classification module calculates the distribution cabinet environment impact tendency parameter according to the distribution cabinet environment parameter.

[0076] Obtain environmental parameters of the power distribution cabinet;

[0077] The difference between the calculated wind speed and the standard wind speed threshold is recorded as the wind speed deviation, the absolute value of the difference between the calculated temperature and the standard temperature threshold is recorded as the temperature deviation, and the absolute value of the difference between the calculated humidity and the standard humidity threshold is recorded as the humidity deviation;

[0078] The ratio of the wind speed deviation to the standard wind speed threshold is recorded as the wind speed influence tendency parameter, the ratio of the temperature deviation to the standard temperature threshold is recorded as the temperature influence tendency parameter, and the ratio of the humidity deviation to the standard humidity threshold is recorded as the humidity influence tendency parameter;

[0079] The wind speed influence tendency parameter, temperature influence tendency parameter and humidity influence tendency parameter are weightedly summed to obtain the distribution cabinet environment influence tendency parameter.

[0080] In this embodiment, the standard wind speed threshold is selected within the range of [15.2 m / s, 17.2 m / s], the standard temperature threshold is selected within the range of [10° C., 20° C.], and the standard humidity threshold is selected within the range of [60%, 70%].

[0081] In this embodiment, the weight coefficient of the wind speed affecting the inclination parameter is 0.4, the weight coefficient of the temperature affecting the inclination parameter is 0.2, and the weight coefficient of the humidity affecting the inclination parameter is 0.4.

[0082] It can be understood that the environmental parameters are the wind speed, temperature and humidity of the external environment where the distribution cabinet is located.

[0083] Specifically, the distribution cabinet environment classification module of the present invention calculates the distribution cabinet environment impact tendency parameters based on the distribution cabinet environment parameters. In actual situations, environmental factors will affect the operation of the distribution cabinet. Wind speed, temperature and humidity are important influencing parameters that affect the operation of the distribution cabinet. By calculating the distribution cabinet environment impact tendency parameters based on wind speed, temperature and humidity, the stability of the distribution cabinet operation can be characterized to a certain extent, thereby adopting different strategies for the fault monitoring of the distribution cabinet and improving the reliability of the distribution cabinet fault monitoring.

[0084] The distribution cabinet environment classification module divides the environmental impact categories.

[0085] Compare the distribution cabinet environmental impact tendency parameter with the preset distribution cabinet environmental impact tendency parameter comparison threshold,

[0086] If the distribution cabinet environmental impact tendency parameter is less than the preset distribution cabinet environmental impact tendency parameter comparison threshold, the environmental impact category is classified as a weak tendency environmental impact category;

[0087] If the distribution cabinet environmental impact tendency parameter is greater than or equal to the preset distribution cabinet environmental impact tendency parameter comparison threshold, the environmental impact category is classified as a strong tendency environmental impact category.

[0088] In this embodiment, the preset distribution cabinet environment impact tendency parameter comparison threshold is selected within the range of [0.3, 0.5].

[0089] The strategy selection unit is used to select a distribution cabinet fault monitoring strategy according to the environmental impact category, wherein:

[0090] If the environmental impact category is a weak tendency environmental impact category, the vibration signal during the operation of each of the devices and the gas concentration in the distribution cabinet are obtained, the characteristic abnormal interval is extracted, and it is determined whether there is a fault in the distribution cabinet;

[0091] If the environmental impact category is a strong tendency environmental impact category, the current value in the distribution cabinet is obtained in real time, and a monitoring strategy is selected based on the current value, including obtaining the gas concentration in the distribution cabinet and the image inside the distribution cabinet to determine whether there is a fault in the distribution cabinet, or performing signal separation processing on the vibration signal through digital filtering, and determining whether there is a fault in the distribution cabinet based on the separated vibration signal.

[0092] The strategy selects the unit to extract the characteristic abnormal interval,

[0093] Obtain the vibration signal during the operation of each of the devices and the gas concentration in the distribution cabinet,

[0094] If the first preset condition is met, a preset time interval segment containing the amplitude change value of the vibration signal is extracted or a preset time interval segment containing the gas concentration change value is extracted, and the preset time interval segment is a characteristic abnormal interval;

[0095] The first preset condition is that the vibration signal amplitude change value is greater than a preset amplitude change value threshold, or the gas concentration change is greater than a preset gas concentration change threshold.

[0096] In this embodiment, the vibration signals of each device in the distribution cabinet without faults during operation are obtained in advance, the amplitude change value of each vibration signal is obtained, the average amplitude change value fe of each device is obtained, the amplitude change value threshold fb0=a×fe is preset, a is the amplitude change coefficient, 1.2<a<1.3, and the preset gas concentration change threshold vb0 is selected within the range of [0.05ppm, 0.15ppm].

[0097] In this embodiment, the preset time interval is selected within the range of [5min, 10min].

[0098] It can be understood that when the vibration signal amplitude change value is greater than the preset amplitude change value threshold, or the gas concentration change is greater than the preset gas concentration change threshold, the time period in which the vibration signal amplitude change value is located is extracted, or the time period in which the gas concentration change value is located is extracted. For example, the vibration signal amplitude change value is at 12:05, and the preset time interval is 10 minutes, then the characteristic abnormality interval is 12:00-12:10.

[0099] The strategy selection unit determines whether there is a fault in the power distribution cabinet.

[0100] Obtain the vibration signal amplitude within the characteristic abnormal range and the gas concentration in the distribution cabinet within the characteristic abnormal range.

[0101] Compare the vibration signal amplitude with the preset amplitude comparison threshold, and compare the gas concentration in the distribution cabinet with the preset gas concentration comparison threshold.

[0102] If the amplitude of the vibration signal is greater than a preset amplitude comparison threshold, or the gas concentration in the distribution cabinet is greater than a preset gas concentration comparison threshold, it is determined that the distribution cabinet is faulty.

[0103] In this embodiment, the vibration signals of each device during the operation of the distribution cabinet when it is operating without fault are obtained in advance, the maximum amplitude fmax of the vibration signal during the operation of each device is obtained, the amplitude comparison threshold f0=b×fmax is preset, b is the amplitude coefficient, 1<b<1.2, and the preset gas concentration comparison threshold v0 includes a preset ozone gas concentration comparison threshold selected within the range of [0.15ppm, 0.25ppm], and a preset sulfur hexafluoride gas concentration comparison threshold selected within the range of [950ppm, 1050ppm].

[0104] Specifically, the strategy selection unit of the present invention obtains the vibration signal during the operation of each of the devices and the gas concentration in the distribution cabinet, extracts the characteristic abnormal interval, and determines whether there is a fault in the distribution cabinet. The distribution cabinet may fail due to equipment aging, equipment corrosion and other reasons during the operation of the equipment. The vibration signal of each device during operation and the gas concentration in the distribution cabinet are important characterization parameters for characterizing whether there is an abnormality in the equipment. When there is an abnormality in the equipment, the vibration signal during the operation of the equipment is also abnormal accordingly. Therefore, by obtaining the vibration signal of each device during operation and the gas concentration in the distribution cabinet, it is possible to monitor whether there is a fault in the distribution cabinet, while ensuring the reliability of the monitoring results while making the monitoring relatively simple.

[0105] The strategy selection unit selects a monitoring strategy according to the current value.

[0106] Compare the current value with the preset current value comparison threshold,

[0107] If the current value is greater than the preset current value comparison threshold, the vibration signal is separated by digital filtering, and it is determined whether the power distribution cabinet is faulty based on the separated vibration signal;

[0108] If the current value is less than or equal to the preset current value comparison threshold, the gas concentration in the distribution cabinet and the image inside the distribution cabinet are obtained to determine whether there is a fault in the distribution cabinet.

[0109] In this embodiment, the preset current value comparison threshold is selected within the range of [30kA, 40kA].

[0110] In this embodiment, a band-stop filter is used to eliminate the influence of the vibration signal of the environment on the vibration signal of each device.

[0111] The strategy selection unit obtains the gas concentration in the distribution cabinet and the image in the distribution cabinet to determine whether there is a fault in the distribution cabinet.

[0112] Compare the image inside the power distribution cabinet with the operating image of the standard power distribution cabinet to obtain the similarity value.

[0113] If the gas concentration in the power distribution cabinet is greater than a preset gas concentration comparison threshold, or the similarity value is less than a preset similarity value comparison threshold, it is determined that there is a fault in the power distribution cabinet.

[0114] In this embodiment, image analysis software is used to obtain similarity values ​​between the image inside the distribution cabinet and the standard distribution cabinet operation image. The image analysis software may be matlab, and the standard distribution cabinet operation image is a pre-obtained image of a distribution cabinet in trouble-free operation.

[0115] In this embodiment, the preset similarity value comparison threshold is selected within the range of [98%, 100%].

[0116] The strategy selection unit performs signal separation processing on the vibration signal through digital filtering, and determines whether there is a fault in the power distribution cabinet according to the separated vibration signal.

[0117] The vibration signals of the equipment are separated and processed by digital filtering during operation.

[0118] Get the vibration signal after separation and processing,

[0119] If the amplitude of the vibration signal during the operation of the equipment is greater than the preset amplitude comparison threshold, it is determined that there is a fault in the distribution cabinet.

[0120] Specifically, the strategy selection unit of the present invention performs signal separation processing on the vibration signal through digital filtering, and determines whether there is a fault in the distribution cabinet based on the separated vibration signal. In actual situations, there may be the influence of environmental factors such as strong winds or earthquakes, and the vibration signals of various equipment in the distribution cabinet during operation may be interfered with, resulting in the obtained vibration signals of various equipment in the distribution cabinet during operation. The equipment cannot truly reflect the operation status of each equipment in the distribution cabinet. By using the digital filtering method to eliminate the influence of the environment on the vibration signals of each device, the reliability of fault monitoring in the distribution cabinet can be improved.

[0121] like Figure 4 As shown, the present invention provides a fault monitoring method for a power distribution cabinet, comprising:

[0122] Step S1, collecting vibration signals during the operation of several devices in the distribution cabinet, the several devices including circuit breakers, capacitors and current transformers, collecting gas concentration in the distribution cabinet, and obtaining an image in the distribution cabinet;

[0123] Step S2, obtaining the environmental parameters of the power distribution cabinet, the environmental parameters including wind speed, temperature and humidity, calculating the environmental impact tendency parameters of the power distribution cabinet according to the environmental parameters of the power distribution cabinet, and dividing the environmental impact categories;

[0124] Step S3, selecting a distribution cabinet fault monitoring strategy according to the environmental impact category, including:

[0125] Obtain the vibration signal during the operation of each of the devices and the gas concentration in the power distribution cabinet, extract the characteristic abnormal interval, and determine whether there is a fault in the power distribution cabinet;

[0126] Or, obtain the current value in the distribution cabinet in real time, and select a monitoring strategy based on the current value, including obtaining the gas concentration in the distribution cabinet and the image in the distribution cabinet to determine whether there is a fault in the distribution cabinet, or perform signal separation processing on the vibration signal through digital filtering, and determine whether there is a fault in the distribution cabinet based on the separated vibration signal;

[0127] Step S4, displaying the determination result.

[0128] The modules involved in the embodiments described in this application may be implemented by software or hardware, and the modules described may also be set in a processor.

[0129] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the device, method and computer program product according to various embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based device that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0130] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A fault monitoring system for a power distribution cabinet, characterized in that: include: The data acquisition module includes a vibration acquisition unit arranged on a plurality of devices in the power distribution cabinet to acquire vibration signals of each of the devices during operation, wherein the plurality of devices include a circuit breaker, a capacitor, and a current transformer, a gas concentration acquisition unit arranged in the power distribution cabinet to acquire gas concentration in the power distribution cabinet, and an image acquisition unit arranged in the power distribution cabinet to acquire images in the power distribution cabinet; The distribution cabinet environment classification module is used to obtain the distribution cabinet environment parameters, including wind speed, temperature and humidity, calculate the distribution cabinet environment impact tendency parameters according to the distribution cabinet environment parameters, and classify the environmental impact categories; A host computer, connected to each of the data acquisition modules and the distribution cabinet environment classification module, includes a strategy selection unit and a display unit; The strategy selection unit is used to select a distribution cabinet fault monitoring strategy according to the environmental impact category, including: Obtain the vibration signal during the operation of each of the devices and the gas concentration in the power distribution cabinet, extract the characteristic abnormal interval, and determine whether there is a fault in the power distribution cabinet; Or, obtain the current value in the distribution cabinet in real time, and select a monitoring strategy based on the current value, including obtaining the gas concentration in the distribution cabinet and the image in the distribution cabinet to determine whether there is a fault in the distribution cabinet, or perform signal separation processing on the vibration signal through digital filtering, and determine whether there is a fault in the distribution cabinet based on the separated vibration signal; The display unit is used to display the determination result of the strategy selection unit.

2. The fault monitoring system for a power distribution cabinet according to claim 1, characterized in that: The distribution cabinet environment classification module calculates the distribution cabinet environment impact tendency parameter according to the distribution cabinet environment parameter. Obtain environmental parameters of the power distribution cabinet; The difference between the calculated wind speed and the standard wind speed threshold is recorded as the wind speed deviation, the absolute value of the difference between the calculated temperature and the standard temperature threshold is recorded as the temperature deviation, and the absolute value of the difference between the calculated humidity and the standard humidity threshold is recorded as the humidity deviation; The ratio of the wind speed deviation to the standard wind speed threshold is recorded as the wind speed influence tendency parameter, the ratio of the temperature deviation to the standard temperature threshold is recorded as the temperature influence tendency parameter, and the ratio of the humidity deviation to the standard humidity threshold is recorded as the humidity influence tendency parameter; The wind speed influence tendency parameter, temperature influence tendency parameter and humidity influence tendency parameter are weightedly summed to obtain the distribution cabinet environment influence tendency parameter.

3. The fault monitoring system for a power distribution cabinet according to claim 2, characterized in that: The distribution cabinet environment classification module divides the environmental impact categories. Compare the distribution cabinet environmental impact tendency parameter with the preset distribution cabinet environmental impact tendency parameter comparison threshold, If the distribution cabinet environmental impact tendency parameter is less than the preset distribution cabinet environmental impact tendency parameter comparison threshold, the environmental impact category is classified as a weak tendency environmental impact category; If the distribution cabinet environmental impact tendency parameter is greater than or equal to the preset distribution cabinet environmental impact tendency parameter comparison threshold, the environmental impact category is classified as a strong tendency environmental impact category.

4. The fault monitoring system for a power distribution cabinet according to claim 3, characterized in that: The strategy selection unit is used to select a distribution cabinet fault monitoring strategy according to the environmental impact category, wherein: If the environmental impact category is a weak tendency environmental impact category, the vibration signal during the operation of each of the devices and the gas concentration in the distribution cabinet are obtained, the characteristic abnormal interval is extracted, and it is determined whether there is a fault in the distribution cabinet; If the environmental impact category is a strong tendency environmental impact category, the current value in the distribution cabinet is obtained in real time, and a monitoring strategy is selected based on the current value, including obtaining the gas concentration in the distribution cabinet and the image inside the distribution cabinet to determine whether there is a fault in the distribution cabinet, or performing signal separation processing on the vibration signal through digital filtering, and determining whether there is a fault in the distribution cabinet based on the separated vibration signal.

5. The fault monitoring system for a power distribution cabinet according to claim 1, characterized in that: The strategy selects the unit to extract the characteristic abnormal interval, Obtain the vibration signal during the operation of each of the devices and the gas concentration in the distribution cabinet, If the first preset condition is met, a preset time interval segment containing the amplitude change value of the vibration signal is extracted or a preset time interval segment containing the gas concentration change value is extracted, and the preset time interval segment is a characteristic abnormal interval; The first preset condition is that the vibration signal amplitude change value is greater than a preset amplitude change value threshold, or the gas concentration change is greater than a preset gas concentration change threshold.

6. The fault monitoring system for a power distribution cabinet according to claim 5, characterized in that: The strategy selection unit determines whether there is a fault in the power distribution cabinet. Obtain the vibration signal amplitude within the characteristic abnormal range and the gas concentration in the distribution cabinet within the characteristic abnormal range. Compare the vibration signal amplitude with the preset amplitude comparison threshold, and compare the gas concentration in the distribution cabinet with the preset gas concentration comparison threshold. If the amplitude of the vibration signal is greater than a preset amplitude comparison threshold, or the gas concentration in the distribution cabinet is greater than a preset gas concentration comparison threshold, it is determined that the distribution cabinet is faulty.

7. The fault monitoring system for a power distribution cabinet according to claim 1, characterized in that: The strategy selection unit selects a monitoring strategy according to the current value. Compare the current value with the preset current value comparison threshold, If the current value is greater than the preset current value comparison threshold, the vibration signal is separated by digital filtering, and it is determined whether the power distribution cabinet is faulty based on the separated vibration signal; If the current value is less than or equal to the preset current value comparison threshold, the gas concentration in the distribution cabinet and the image inside the distribution cabinet are obtained to determine whether there is a fault in the distribution cabinet.

8. The fault monitoring system for a power distribution cabinet according to claim 1, characterized in that: The strategy selection unit obtains the gas concentration in the distribution cabinet and the image in the distribution cabinet to determine whether there is a fault in the distribution cabinet. Compare the image inside the power distribution cabinet with the operating image of the standard power distribution cabinet to obtain the similarity value. If the gas concentration in the power distribution cabinet is greater than a preset gas concentration comparison threshold, or the similarity value is less than a preset similarity value comparison threshold, it is determined that there is a fault in the power distribution cabinet.

9. The fault monitoring system for a power distribution cabinet according to claim 1, characterized in that: The strategy selection unit performs signal separation processing on the vibration signal through digital filtering, and determines whether there is a fault in the power distribution cabinet according to the separated vibration signal. The vibration signals of the equipment are separated and processed by digital filtering during operation. Get the vibration signal after separation and processing, If the amplitude of the vibration signal during the operation of the equipment is greater than the preset amplitude comparison threshold, it is determined that there is a fault in the distribution cabinet.

10. A fault monitoring method for a power distribution cabinet, characterized in that: The fault monitoring system for a power distribution cabinet according to any one of claims 1 to 9 is applied, and the fault monitoring method for a power distribution cabinet comprises: Step S1, collecting vibration signals during the operation of several devices in the distribution cabinet, the several devices including circuit breakers, capacitors and current transformers, collecting gas concentration in the distribution cabinet, and obtaining an image in the distribution cabinet; Step S2, obtaining the environmental parameters of the power distribution cabinet, the environmental parameters including wind speed, temperature and humidity, calculating the environmental impact tendency parameters of the power distribution cabinet according to the environmental parameters of the power distribution cabinet, and dividing the environmental impact categories; Step S3, selecting a distribution cabinet fault monitoring strategy according to the environmental impact category, including: Obtain the vibration signal during the operation of each of the devices and the gas concentration in the power distribution cabinet, extract the characteristic abnormal interval, and determine whether there is a fault in the power distribution cabinet; Or, obtain the current value in the distribution cabinet in real time, and select a monitoring strategy based on the current value, including obtaining the gas concentration in the distribution cabinet and the image in the distribution cabinet to determine whether there is a fault in the distribution cabinet, or perform signal separation processing on the vibration signal through digital filtering, and determine whether there is a fault in the distribution cabinet based on the separated vibration signal; Step S4, displaying the determination result.

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