Transformer status monitoring method, device, terminal equipment and storage medium

Abstract

The present invention discloses a transformer condition monitoring method, apparatus, terminal device, and storage medium. The method comprises: obtaining current measured values of internal parameters of a transformer under test, a load value of a load, and parameter values of various external environmental parameters; projecting the measured values, load values, and various parameter values into a spatial rectangular coordinate system to obtain a plurality of first projection points; projecting historical measured values of internal parameters, historical load values, and historical parameter values of various external environmental parameters of the transformer under different fault coefficients into the spatial rectangular coordinate system to obtain a plurality of second projection points; selecting a reference projection point corresponding to the first projection point; analyzing the current fault condition of the transformer under test based on the fault coefficients corresponding to the reference projection points, and generating corresponding alarm information when a fault occurs in the transformer under test. The present invention can improve the accuracy of transformer condition monitoring.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer monitoring, and in particular to a transformer state monitoring method, apparatus, terminal equipment and storage medium. Background Art

[0002] Transformers are core equipment in power grids, and their operating status is directly related to the safe operation of equipment and systems. However, power transformer failures still occur during operation, causing equipment accidents, casualties, and property damage. Therefore, power transformer status monitoring and troubleshooting are particularly important to ensure the safe operation of the power grid and are the core content of power grid equipment operation and management.

[0003] The current existing transformer status monitoring method generally uses deployed sensors to collect the real-time internal operating parameters of the transformer, such as the transformer's input and output voltage, current or transformer oil temperature, and obtain the current load size of the transformer. The corresponding alarm threshold is matched according to the current load size, and then the collected real-time internal operating parameter value is compared with the matched alarm threshold. When the real-time internal operating parameter value exceeds the alarm threshold, it is determined that the transformer has a fault and an alarm is issued.

[0004] This transformer condition monitoring method only considers the internal operating parameters of the transformer. The transformer monitoring results can be obtained simply by comparing the real-time collected internal operating parameter values with the set alarm threshold. However, in actual applications, external environmental factors such as temperature, humidity, and dust in the transformer's environment will affect the sensor's acquisition accuracy or the transformer's internal parameters. For example, the measurement accuracy of some sensors may decrease under high temperature conditions, resulting in measurement errors, affecting the accurate monitoring of the transformer's condition; or excessive humidity may cause inaccurate test data. For example, when measuring insulation resistance, high humidity will increase the leakage current on the insulation surface, thereby causing the measured insulation resistance value to be low, affecting the judgment of the transformer's insulation condition. This method does not take into account the influence of external environmental factors, making the transformer condition monitoring results prone to errors, leading to false alarms or untimely identification of transformer faults. Summary of the Invention

[0005] The present invention provides a transformer status monitoring method, apparatus, terminal device and storage medium to solve the technical problem that existing transformer status detection methods do not take into account the influence of external environmental factors, making the transformer status monitoring results prone to errors, leading to false alarms or untimely transformer fault identification.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a transformer status monitoring method, comprising:

[0007] Obtaining the measured values of the current internal parameters of the transformer under test, the load value, and the parameter values of various external environmental parameters; wherein the measured values include: voltage, current or oil temperature; the parameter values include: temperature, humidity and dust content;

[0008] Establishing a corresponding first spatial rectangular coordinate system with the external environmental parameter as the X-axis, the internal parameter as the Y-axis, and the load as the Z-axis, and projecting the measurement value, the load value, and each parameter value into the first spatial rectangular coordinate system to obtain a plurality of first projection points corresponding to each external environmental parameter;

[0009] Obtain historical measurement values of historical internal parameters, historical load values, and historical parameter values of each historical external environmental parameter of the transformer under different fault coefficients, establish a corresponding second spatial rectangular coordinate system with the historical external environmental parameter as the X-axis, the historical internal parameter as the Y-axis, and the historical load as the Z-axis, and project the historical measurement values, historical load values, and each historical parameter value into the second spatial rectangular coordinate system to obtain a plurality of second projection points corresponding to each historical external environmental parameter under different fault coefficients;

[0010] Superimposing the first rectangular coordinate system and the second rectangular coordinate system, for each first projection point corresponding to an external environment parameter, selecting a second projection point with the shortest distance to the corresponding first projection point and having the same historical external environment parameter as the type of the external environment parameter as the reference projection point corresponding to the external environment parameter;

[0011] Obtain the fault coefficient corresponding to each reference projection point, analyze the current fault condition of the transformer to be tested based on each fault coefficient, and generate corresponding alarm information when the transformer to be tested fails.

[0012] As a preferred solution, the current fault condition of the transformer to be tested is obtained according to the analysis of each fault coefficient, and corresponding alarm information is generated when a fault occurs in the transformer to be tested, including:

[0013] Obtaining weight coefficients corresponding to the external environmental parameters, and calculating a total fault coefficient corresponding to the transformer to be tested based on the fault coefficients corresponding to the reference projection points of the external environmental parameters and the weight coefficients;

[0014] The total fault coefficient is compared with a preset fault coefficient threshold. When the total fault coefficient is greater than the fault coefficient threshold, it is determined that the transformer to be tested has a fault and a corresponding alarm message is generated. When the total fault coefficient is not greater than the fault coefficient threshold, it is determined that the transformer to be tested has no fault.

[0015] As a preferred solution, before obtaining the measured values of the current internal parameters of the transformer to be tested, the load value of the load, and the parameter values of each external environmental parameter, the method further includes:

[0016] Obtaining several initial external environment parameters;

[0017] For each initial external environmental parameter, obtaining an initial measured value of the internal parameter of the transformer and an initial parameter value of the corresponding initial external environmental parameter under different load values, and calculating a correlation coefficient between the initial parameter value and the initial measured value;

[0018] The correlation coefficient is compared with a preset correlation coefficient threshold. When the correlation coefficient is greater than the correlation coefficient threshold, the corresponding initial external environment parameter is used as the external environment parameter, and the weight coefficient corresponding to each external environment parameter is determined according to the size of the correlation coefficient corresponding to each external environment parameter.

[0019] As a preferred solution, the calculating of the correlation coefficient between the initial parameter value and the initial measurement value includes:

[0020] Calculating the change in the initial measurement value of the corresponding internal parameter between each adjacent detection moment of the initial external environmental parameter;

[0021] Each of the changes is averaged to obtain a corresponding average change, and the average change is compared with a preset change threshold, and then the correlation coefficient between the initial parameter value corresponding to the initial external environment parameter and the initial measurement value of the internal parameter is determined based on the comparison result.

[0022] As a preferred solution, after obtaining the current fault condition of the transformer to be tested according to the fault coefficient analysis and generating corresponding alarm information when the transformer to be tested fails, the method further includes:

[0023] When a fault occurs in the transformer to be tested, the fault type corresponding to the transformer to be tested is analyzed based on the measured values of the current internal parameters of the transformer to be tested, the load value of the load, and the parameter values of various external environmental parameters. Then, based on the fault type and the total fault coefficient of the transformer to be tested, a corresponding fault handling solution is matched for the transformer to be tested.

[0024] As a preferred solution, the analysis of the fault type corresponding to the transformer to be tested based on the measured values of the current internal parameters of the transformer to be tested, the load value of the load, and the parameter values of various external environmental parameters includes:

[0025] For each external environmental parameter, obtain a standard parameter value of the external environmental parameter and a standard measured value of the internal parameter of a normal transformer corresponding to the load value, and generate a curve graph between the standard parameter value and the standard measured value with the external environmental parameter as the X-axis and the internal parameter as the Y-axis;

[0026] In the curve graph, obtaining a standard measurement value corresponding to each parameter value, comparing the standard measurement value with the measurement value, and obtaining a difference between the standard measurement value and the measurement value;

[0027] Taking the external environmental parameter with the largest difference between the standard measurement value and the measurement value as the target external environmental parameter, and obtaining several fault types corresponding to the target external environmental parameter;

[0028] Extracting, based on the internal parameter fault values of the transformer corresponding to each of the fault types, internal parameter fault features of each of the internal parameter fault values, and extracting a current internal parameter feature corresponding to the measured value of the current internal parameter of the transformer to be tested, comparing the current internal parameter feature with each of the internal parameter fault features, and then selecting, based on the comparison result, the internal parameter fault feature that is most similar to the current internal parameter feature as a target internal parameter fault feature;

[0029] The fault type corresponding to the target internal parameter fault characteristic is used as the fault type of the transformer to be tested.

[0030] As a preferred solution, matching a corresponding fault handling solution for the transformer to be tested according to the fault type and the total fault coefficient of the transformer to be tested includes:

[0031] According to the fault type, obtaining several fault handling solutions corresponding to the fault type from a preset database;

[0032] Obtaining the implementation time, implementation cost, and implementation effect of each of the fault handling solutions, and analyzing and obtaining a priority coefficient of each of the fault handling solutions based on the implementation time, implementation cost, and implementation effect;

[0033] A corresponding fault handling solution is selected for the transformer to be tested according to the priority coefficients of the fault handling solutions and the total fault coefficient of the transformer to be tested.

[0034] Based on the above embodiment, another embodiment of the present invention provides a transformer state monitoring device, comprising: a parameter value acquisition module, a first space rectangular coordinate system construction module, a second space rectangular coordinate system construction module, a reference projection point selection module, and a transformer fault analysis module;

[0035] The parameter value acquisition module is used to obtain the measured values of the current internal parameters of the transformer to be tested, the load value of the load, and the parameter values of various external environmental parameters; wherein the measured values include: voltage, current or oil temperature; the parameter values include: temperature, humidity and dust content;

[0036] The first spatial rectangular coordinate system construction module is configured to establish a corresponding first spatial rectangular coordinate system with the external environmental parameter as the X-axis, the internal parameter as the Y-axis, and the load as the Z-axis, and project the measurement value, the load value, and each parameter value into the first spatial rectangular coordinate system to obtain a plurality of first projection points corresponding to each external environmental parameter;

[0037] The second spatial rectangular coordinate system construction module is used to obtain historical measurement values of historical internal parameters, historical load values of historical loads, and historical parameter values of various historical external environmental parameters of the transformer under different fault coefficients, establish a corresponding second spatial rectangular coordinate system with the historical external environmental parameters as the X-axis, the historical internal parameters as the Y-axis, and the historical load as the Z-axis, and project the historical measurement values, historical load values, and various historical parameter values into the second spatial rectangular coordinate system to obtain a plurality of second projection points corresponding to various historical external environmental parameters under different fault coefficients;

[0038] The reference projection point selection module is configured to superimpose the first rectangular space coordinate system and the second rectangular space coordinate system, and for each first projection point corresponding to an external environment parameter, select a second projection point having the shortest distance to the corresponding first projection point and having the same historical external environment parameter as the type of the external environment parameter as the reference projection point corresponding to the external environment parameter;

[0039] The transformer fault analysis module is used to obtain the fault coefficient corresponding to each reference projection point, obtain the current fault condition of the transformer to be tested based on the analysis of each fault coefficient, and generate corresponding alarm information when the transformer to be tested fails.

[0040] Based on the above embodiments, another embodiment of the present invention provides an electronic device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, the transformer state monitoring method described in the above embodiments of the invention is implemented.

[0041] Based on the above embodiment, another embodiment of the present invention provides a storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the transformer status monitoring method described in the above embodiment of the invention.

[0042] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0043] An embodiment of the present invention provides a transformer state monitoring method, which uses the external environmental parameters of the transformer as the X-axis, the internal parameters as the Y-axis, and the load as the Z-axis to establish a first spatial rectangular coordinate system, and projects the current measured values of the internal parameters of the transformer to be measured, the load value of the load, and the parameter value of the external environmental parameter into the first spatial rectangular coordinate system to obtain a plurality of first projection points corresponding to each external environmental parameter; uses the historical external environmental parameter as the X-axis, the historical internal parameter as the Y-axis, and the historical load as the Z-axis to establish a corresponding second spatial rectangular coordinate system, and projects the historical measured values of the historical internal parameters of the transformer under different fault coefficients, the historical load value of the historical load, and the historical parameter value of each historical external environmental parameter into the second spatial rectangular coordinate system to obtain a plurality of second projection points corresponding to each historical external environmental parameter under different fault coefficients;

[0044] Then, the first spatial rectangular coordinate system and the second spatial rectangular coordinate system are superimposed, and the second projection point with the shortest distance to the corresponding first projection point is selected as the reference projection point corresponding to the external environmental parameter; the fault coefficient corresponding to each reference projection point is obtained, and the current fault condition of the transformer to be tested is obtained according to each fault coefficient analysis to obtain the corresponding transformer fault coefficient, and then the current fault condition of the transformer to be tested is analyzed according to the fault coefficient.

[0045] The present invention comprehensively considers the influence of internal parameters and external environmental parameters on transformer status monitoring. Since the influence of external environmental parameters on internal parameter measurement is complex, it is impossible to establish a simple linear relationship between the external environmental parameters and the internal parameters. Therefore, the present invention establishes a first spatial rectangular coordinate system with the external environmental parameters as the X-axis, the internal parameters as the Y-axis, and the load as the Z-axis; then the current parameters of the transformer and historical data under different fault coefficients are projected into the spatial rectangular coordinate system, and in the spatial coordinate system, the first projection point of the current parameter of the transformer and the second projection point of the historical parameter under different fault coefficients are compared to match the fault coefficient corresponding to the transformer to be measured, and then the current fault condition of the transformer to be measured is analyzed according to the fault coefficient, thereby improving the transformer status monitoring accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a flow chart of a transformer status monitoring method provided by one embodiment of the present invention;

[0047] Figure 2 It is a structural diagram of a transformer status monitoring device provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0048] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0050] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relativity or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0051] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0052] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0053] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0054] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0055] Example 1

[0056] Please refer to Figure 1 , which is a flow chart of a transformer status monitoring method provided by one embodiment of the present invention, including the following specific steps:

[0057] S1. Obtaining the measured values of the current internal parameters of the transformer to be tested, the load value, and the parameter values of various external environmental parameters; wherein the measured values include: voltage, current or oil temperature; and the parameter values include: temperature, humidity, and dust content;

[0058] Preferably, before obtaining the measured values of the current internal parameters of the transformer to be tested, the load value of the load, and the parameter values of each external environmental parameter, it also includes: obtaining a number of initial external environmental parameters; for each initial external environmental parameter, obtaining the initial measured values of the internal parameters of the transformer under different load values and the initial parameter values of the corresponding initial external environmental parameters, and calculating the correlation coefficient between the initial parameter values and the initial measured values; comparing the correlation coefficient with a preset correlation coefficient threshold value, and when the correlation coefficient is greater than the correlation coefficient threshold value, using the corresponding initial external environmental parameter as the external environmental parameter, and determining the weight coefficient corresponding to each external environmental parameter according to the size of the correlation coefficient corresponding to each external environmental parameter.

[0059] Preferably, the calculation of the correlation coefficient between the initial parameter value and the initial measurement value includes: calculating the change in the initial measurement value of the corresponding internal parameter between each adjacent detection moment of the initial external environmental parameter; averaging each of the changes to obtain a corresponding average change, and comparing the average change with a preset change threshold, and then determining the correlation coefficient between the initial parameter value corresponding to the initial external environmental parameter and the initial measurement value of the internal parameter based on the comparison result. Schematically, the calculation formula of the correlation coefficient is: ; Wherein, C is the correlation coefficient, A is the average change, and B is the preset change threshold.

[0060] Specifically, during the status monitoring process of the transformer, since external environmental factors such as temperature, humidity, and dust in the environment where the transformer is located will affect the acquisition accuracy of the sensor or the internal parameters of the transformer, if only the internal parameters of the transformer collected by the sensor are considered to judge the fault condition of the transformer, errors are likely to occur. Therefore, the present invention comprehensively considers the internal parameters and external environmental parameters of the transformer, compares the measured values of the current internal parameters and the parameter values of the external environmental parameters collected by the transformer to be tested with the historical values of the transformer under different fault coefficients, obtains the corresponding transformer fault coefficient, and then analyzes the current fault condition of the transformer to be tested based on the fault coefficient, thereby improving the status monitoring accuracy of the transformer. Specifically, the transformer status monitoring method described in the present invention specifically includes the following steps:

[0061] 1. Selection of external environment parameters:

[0062] First, obtain the initial external environmental parameters in the transformer's environment that may affect the transformer's condition monitoring. Then analyze the degree of influence of each initial external environmental parameter on the transformer's internal parameter measurement value. The initial external environmental parameters with a greater degree of influence are the important external environmental parameters, which are used as the transformer's external environmental parameters. In the subsequent transformer condition monitoring process, only the parameter values corresponding to these screened external environmental parameters need to be collected to monitor the transformer's condition. The screening process of external environmental parameters is as follows:

[0063] (1) Obtaining initial external environmental parameters that may affect transformer condition monitoring;

[0064] (2) For each initial external environmental parameter, obtain the initial measurement value of the internal parameter of the transformer under different load values and the initial parameter value of the corresponding initial external environmental parameter; calculate the change of the initial measurement value of the corresponding internal parameter between each adjacent detection moment of the initial external environmental parameter; average each of the changes to obtain a corresponding average change, and compare the average change with a preset change threshold, and then determine the correlation coefficient between the initial parameter value corresponding to the initial external environmental parameter and the initial measurement value of the internal parameter based on the comparison result;

[0065] The correlation coefficient reflects the impact of the initial external environmental parameter on the internal parameter. The greater the change in the initial measured value of the corresponding internal parameter between adjacent detection moments of the initial external environmental parameter, the greater the impact of the change in the initial external environmental parameter on the internal parameter, and the greater the correlation between the initial external environmental parameter and the internal parameter. The change in the internal parameter between each adjacent detection moment of the initial external environmental parameter is then averaged, and the resulting average change is compared with a preset change threshold to assess the degree of influence of each initial external environmental parameter on the internal parameter, which is represented by the correlation coefficient.

[0066] (3) Comparing the correlation coefficient with a preset correlation coefficient threshold value; when the correlation coefficient is greater than the correlation coefficient threshold value, taking the corresponding initial external environment parameter as the external environment parameter, and determining the weight coefficient corresponding to each external environment parameter according to the size of the correlation coefficient corresponding to each external environment parameter.

[0067] The larger the correlation coefficient, the greater the impact of the initial external environmental parameters on the internal parameters. By screening the correlation coefficient, the initial external environmental parameters that have a greater impact on the internal parameters are selected as the external environmental parameters that need to be focused on. They are used as the external environmental parameters in the transformer data acquisition process. In the subsequent transformer status monitoring process, the parameter values of the external environmental parameters are collected. A comprehensive analysis is performed based on the parameter values and the measured values of the internal parameters of the transformer to obtain the fault condition of the transformer.

[0068] 2. Data collection of the transformer to be tested:

[0069] Obtain the measured values of the current internal parameters of the transformer to be tested, the load value of the load, and the parameter values of various external environmental parameters; wherein the measured values include: voltage, current or oil temperature; the parameter values include: temperature, humidity and dust content.

[0070] S2. Establish a corresponding first spatial rectangular coordinate system with the external environmental parameter as the X-axis, the internal parameter as the Y-axis, and the load as the Z-axis, and project the measurement value, load value, and each parameter value into the first spatial rectangular coordinate system to obtain a plurality of first projection points corresponding to each external environmental parameter;

[0071] 3. Construction of the first space rectangular coordinate system:

[0072] With the external environmental parameter as the X-axis, the internal parameter as the Y-axis, and the load as the Z-axis, a corresponding first spatial rectangular coordinate system is established, and the measured values of the current internal parameters of the transformer to be tested, the load value of the load, and the parameter values of each external environmental parameter are projected into the first spatial rectangular coordinate system to obtain several first projection points corresponding to each external environmental parameter.

[0073] In the comprehensive analysis process of external environmental parameters and internal parameters, because external environmental parameters may affect the acquisition accuracy of the sensor, or may cause the measured values of the internal parameters of the transformer to deviate from the actual values, the influence of external environmental parameters on the internal parameters of the transformer is multifaceted and complex, and it is impossible to use a simple linear model or nonlinear model to fit the relationship between the external environmental parameters and the internal parameters, and then correct the measured values of the internal parameters of the transformer. To address this problem, the present invention does not need to fit the relationship between the external environmental parameters and the internal parameters. It directly compares the measured values of the current internal parameters collected by the transformer to be tested and the parameter values of the external environmental parameters with the historical values of the transformer under different fault coefficients to obtain the corresponding transformer fault coefficient. Then, based on the fault coefficient, the current fault condition of the transformer to be tested can be analyzed.

[0074] First, with the external environmental parameter as the X-axis, the internal parameter as the Y-axis, and the load as the Z-axis, a corresponding first spatial rectangular coordinate system is established, and the collected measured values of the current internal parameters of the transformer to be tested, the parameter values of the external environmental parameters, and the corresponding load values are projected into the first spatial rectangular coordinate system to obtain a plurality of first projection points, wherein the X coordinate of each first projection point is the parameter value of one of the external environmental parameters, the Y coordinate is the measured value of the current internal parameter of the transformer, and the Z coordinate is the load value of the current load, and all first projection points are in the same xoy plane of the first spatial rectangular coordinate system. It should be noted that when projecting different types of external environmental parameters into the first spatial rectangular coordinate system, for different types of external environmental parameters, after removing the dimension of the collected parameter values, they are projected into the first spatial rectangular coordinate system according to the dimensionless values.

[0075] S3. Obtain historical measurement values of historical internal parameters, historical load values, and historical parameter values of each historical external environmental parameter of the transformer under different fault coefficients, establish a corresponding second spatial rectangular coordinate system with the historical external environmental parameter as the X-axis, the historical internal parameter as the Y-axis, and the historical load as the Z-axis, and project the historical measurement values, historical load values, and each historical parameter value into the second spatial rectangular coordinate system to obtain a plurality of second projection points corresponding to each historical external environmental parameter under different fault coefficients;

[0076] 4. Construction of the second space rectangular coordinate system:

[0077] With the historical external environmental parameters as the X-axis, the historical internal parameters as the Y-axis, and the historical load as the Z-axis, a corresponding second spatial rectangular coordinate system is established, and then the historical measurement values of the historical internal parameters, historical parameter values of the historical external environmental parameters, and corresponding historical load values of the transformer with known different fault levels (the fault coefficient is used to indicate the fault level of the transformer, and the larger the fault coefficient, the higher the fault level of the transformer) are projected into the second spatial rectangular coordinate system to obtain several second projection points. Under the same fault coefficient, the transformer has several historical parameter values, one historical measurement value, and one load value. Schematically, the relationship between the fault coefficient and the fault level of the transformer is: ;in, is the fault degree of the transformer, is the failure coefficient, is a natural number greater than 1;

[0078] S4. Superimpose the first spatial rectangular coordinate system and the second spatial rectangular coordinate system. For each first projection point corresponding to an external environment parameter, select a second projection point with the shortest distance to the corresponding first projection point and whose historical external environment parameters are consistent with the type of the external environment parameter as a reference projection point corresponding to the external environment parameter.

[0079] 5. Selection of reference projection points:

[0080] The first spatial rectangular coordinate system and the second spatial rectangular coordinate system are superimposed. For each first projection point (each first projection point corresponds to a parameter value of a different external environment parameter), the second projection point with the shortest distance to the first projection point and whose historical external environment parameters are consistent with the type of the external environment parameters is selected as the reference projection point corresponding to the external environment parameter.

[0081] S5. Obtain the fault coefficient corresponding to each reference projection point, analyze and obtain the current fault condition of the transformer to be tested based on each fault coefficient, and generate corresponding alarm information when the transformer to be tested fails.

[0082] Preferably, the current fault condition of the transformer to be tested is obtained according to the analysis of each fault coefficient, and corresponding alarm information is generated when the transformer to be tested fails, including: obtaining the weight coefficient corresponding to each external environmental parameter, and calculating the total fault coefficient corresponding to the transformer to be tested according to the fault coefficient corresponding to the reference projection point of each external environmental parameter and the weight coefficient; comparing the total fault coefficient with a preset fault coefficient threshold value, when the total fault coefficient is greater than the fault coefficient threshold value, determining that the transformer to be tested fails and generating corresponding alarm information, and when the total fault coefficient is not greater than the fault coefficient threshold value, determining that the transformer to be tested does not fail.

[0083] 6. Analysis of the fault condition of the transformer to be tested:

[0084] Since the second projection point is the projection point of the historical measurement values of the internal parameters of the transformer with a known fault condition (expressed by the fault coefficient), the historical load value of the load, and the historical parameter values of various external environmental parameters, when the distance between the second projection point and the first projection point is the smallest, that is, the closest, it means that the fault condition of the first projection point and the fault condition of the second projection point are closest, and the fault coefficient of the transformer corresponding to the second projection point can be used as the fault coefficient of the transformer to be tested.

[0085] Because there are multiple first projection points (each corresponding to an external environmental parameter), a weight coefficient corresponding to each external environmental parameter is obtained (the weight coefficient reflects the degree of influence of the external environmental parameter on the measured value of the transformer's internal parameter). Based on the fault coefficient corresponding to the reference projection point of each external environmental parameter and the weight coefficient, a total fault coefficient corresponding to the transformer under test is calculated. The total fault coefficient reflects the degree of fault of the transformer under test. A higher total fault coefficient indicates a higher degree of fault of the transformer under test. When the total fault coefficient is not greater than a preset fault coefficient threshold, the fault degree of the transformer under test is determined to be low. When the total fault coefficient is greater than the fault coefficient threshold, the transformer under test is determined to be faulty and a corresponding alarm is generated.

[0086] Preferably, after obtaining the current fault condition of the transformer to be tested according to the analysis of each of the fault coefficients and generating corresponding alarm information when the transformer to be tested fails, it also includes: when the transformer to be tested fails, according to the measured values of the current internal parameters of the transformer to be tested, the load value of the load and the parameter values of each external environmental parameter, analyzing and obtaining the fault type corresponding to the transformer to be tested, and then matching the corresponding fault handling solution for the transformer to be tested according to the fault type and the total fault coefficient of the transformer to be tested.

[0087] Preferably, the method of analyzing and obtaining the fault type corresponding to the transformer to be tested based on the measured values of the current internal parameters of the transformer to be tested, the load value of the load, and the parameter values of each external environmental parameter includes: for each external environmental parameter, obtaining the standard parameter value of the external environmental parameter of a normal transformer corresponding to the load value and the standard measured value of the internal parameter, taking the external environmental parameter as the X-axis and the internal parameter as the Y-axis, generating a curve graph between the standard parameter value and the standard measured value; in the curve graph, obtaining the standard measured value corresponding to each parameter value, comparing the standard measured value with the measured value, and obtaining the difference between the standard measured value and the measured value; comparing the standard measured value with the measured value The external environmental parameter with the largest difference from the measured value is taken as the target external environmental parameter, and several fault types corresponding to the target external environmental parameter are obtained; according to the internal parameter fault value of the transformer corresponding to each fault type, the internal parameter fault feature of each internal parameter fault value is extracted, and the current internal parameter feature corresponding to the measured value of the current internal parameter of the transformer to be tested is extracted, and the current internal parameter feature is compared with each internal parameter fault feature, and then according to the comparison result, the internal parameter fault feature that is most similar to the current internal parameter feature is selected as the target internal parameter fault feature; the fault type corresponding to the target internal parameter fault feature is used as the fault type of the transformer to be tested.

[0088] Preferably, matching a corresponding fault handling scheme for the transformer to be tested according to the fault type and the total fault coefficient of the transformer to be tested includes: obtaining several fault handling schemes corresponding to the fault type from a preset database according to the fault type; obtaining the implementation time, implementation cost and implementation effect of each of the fault handling schemes, and analyzing and obtaining the priority coefficient of each of the fault handling schemes according to the implementation time, implementation cost and implementation effect; and selecting a corresponding fault handling scheme for the transformer to be tested according to the size ranking of the priority coefficients of each fault handling scheme and the total fault coefficient of the transformer to be tested.

[0089] 6. Analysis of fault types of the transformer to be tested:

[0090] When a fault occurs in the transformer under test, the fault type corresponding to the transformer under test is analyzed based on the measured values of the current internal parameters of the transformer under test, the load value of the load, and the parameter values of various external environmental parameters. The specific analysis process is as follows:

[0091] (1) For each external environmental parameter, obtain a standard parameter value of the external environmental parameter and a standard measured value of the internal parameter of a normal transformer corresponding to the load value, and generate a curve graph between the standard parameter value and the standard measured value with the external environmental parameter as the X-axis and the internal parameter as the Y-axis.

[0092] (2) In the curve graph, obtain the standard measurement value corresponding to each parameter value, compare the standard measurement value with the measurement value, and obtain the difference between the standard measurement value and the measurement value. The larger the difference, the greater the impact of the external environmental parameter on the internal parameter measurement value. Then, the external environmental parameter with the largest difference between the standard measurement value and the measurement value is used as the target external environmental parameter (i.e., the external environmental parameter with the largest impact on the internal parameter measurement value), and obtain several possible fault types of the transformer under the influence of the target external environmental parameter.

[0093] (3) According to the internal parameter fault value of the transformer corresponding to each of the fault types, the internal parameter fault characteristics of each of the internal parameter fault values are extracted, and the current internal parameter characteristics corresponding to the measured value of the current internal parameter of the transformer to be tested are extracted, and the current internal parameter characteristics are compared with each of the internal parameter fault characteristics. Then, based on the comparison result, the internal parameter fault characteristic that is most similar to the current internal parameter characteristic is selected as the target internal parameter fault characteristic; the fault type corresponding to the target internal parameter fault characteristic is used as the fault type of the transformer to be tested.

[0094] After identifying the fault type of the transformer to be tested, several fault handling solutions corresponding to the fault type are obtained from a preset database; the implementation time, implementation cost and implementation effect of each fault handling solution are obtained, and the priority coefficient of each fault handling solution is analyzed based on the implementation time, implementation cost and implementation effect; according to the size ranking of the priority coefficients of each fault handling solution and the total fault coefficient of the transformer to be tested, a corresponding fault handling solution is selected for the transformer to be tested.

[0095] Example 2

[0096] Please refer to Figure 2 , is a schematic structural diagram of a transformer condition monitoring device provided by an embodiment of the present invention, the device comprising: a parameter value acquisition module, a first space rectangular coordinate system construction module, a second space rectangular coordinate system construction module, a reference projection point selection module, and a transformer fault analysis module;

[0097] The parameter value acquisition module is used to obtain the measured values of the current internal parameters of the transformer to be tested, the load value of the load, and the parameter values of various external environmental parameters; wherein the measured values include: voltage, current or oil temperature; the parameter values include: temperature, humidity and dust content;

[0098] The first spatial rectangular coordinate system construction module is configured to establish a corresponding first spatial rectangular coordinate system with the external environmental parameter as the X-axis, the internal parameter as the Y-axis, and the load as the Z-axis, and project the measurement value, the load value, and each parameter value into the first spatial rectangular coordinate system to obtain a plurality of first projection points corresponding to each external environmental parameter;

[0099] The second spatial rectangular coordinate system construction module is used to obtain historical measurement values of historical internal parameters, historical load values of historical loads, and historical parameter values of various historical external environmental parameters of the transformer under different fault coefficients, establish a corresponding second spatial rectangular coordinate system with the historical external environmental parameters as the X-axis, the historical internal parameters as the Y-axis, and the historical load as the Z-axis, and project the historical measurement values, historical load values, and various historical parameter values into the second spatial rectangular coordinate system to obtain a plurality of second projection points corresponding to various historical external environmental parameters under different fault coefficients;

[0100] The reference projection point selection module is configured to superimpose the first rectangular space coordinate system and the second rectangular space coordinate system, and for each first projection point corresponding to an external environment parameter, select a second projection point having the shortest distance to the corresponding first projection point and having the same historical external environment parameter as the type of the external environment parameter as the reference projection point corresponding to the external environment parameter;

[0101] The transformer fault analysis module is used to obtain the fault coefficient corresponding to each reference projection point, obtain the current fault condition of the transformer to be tested based on the analysis of each fault coefficient, and generate corresponding alarm information when the transformer to be tested fails.

[0102] It should be noted that the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed across multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. In addition, in the drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art can understand and implement the present invention without inventive effort.

[0103] Those skilled in the art will clearly understand that for the sake of convenience and brevity, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0104] Example 3

[0105] Accordingly, an embodiment of the present invention provides an electronic device, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the transformer state monitoring method described in the above embodiment of the invention when executing the computer program.

[0106] The electronic device may be a computing device such as a desktop computer, a notebook computer, a PDA, a cloud server, etc. The device may include, but is not limited to, a processor and a memory.

[0107] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor. The processor is the control center of the device and connects various parts of the entire device using various interfaces and lines.

[0108] Example 4

[0109] Accordingly, an embodiment of the present invention provides a storage medium, which includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the transformer state monitoring method described in the above embodiment of the invention.

[0110] The memory can be used to store the computer program. The processor implements the various functions of the device by running or executing the computer program stored in the memory and accessing the data stored in the memory. The memory may mainly include a program storage area and a data storage area. The program storage area may store an operating system, at least one application required for a function, etc.; the data storage area may store data created based on the use of the mobile phone, etc. In addition, the memory may include high-speed random access memory and non-volatile memory, such as a hard disk, internal memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0111] The storage medium is a computer-readable storage medium, and the computer program is stored in the computer-readable storage medium. When executed by a processor, the computer program can implement the steps of each of the above-mentioned method embodiments. The computer program includes computer program code, which can be in source code form, object code form, executable file, or some intermediate form. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal, and software distribution medium. It should be noted that the content of the computer-readable medium can be appropriately increased or decreased based on the requirements of legislation and patent practice within a jurisdiction. For example, in some jurisdictions, based on legislation and patent practice, computer-readable media does not include electric carrier signals and telecommunication signals.

[0112] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A transformer status monitoring method, characterized in that: include: Obtaining the measured values of the current internal parameters of the transformer under test, the load value, and the parameter values of various external environmental parameters; wherein the measured values include: voltage, current or oil temperature; the parameter values include: temperature, humidity and dust content; Establishing a corresponding first spatial rectangular coordinate system with the external environmental parameter as the X-axis, the internal parameter as the Y-axis, and the load as the Z-axis, and projecting the measurement value, the load value, and each parameter value into the first spatial rectangular coordinate system to obtain a plurality of first projection points corresponding to each external environmental parameter; Obtain historical measurement values of historical internal parameters, historical load values, and historical parameter values of each historical external environmental parameter of the transformer under different fault coefficients, establish a corresponding second spatial rectangular coordinate system with the historical external environmental parameter as the X-axis, the historical internal parameter as the Y-axis, and the historical load as the Z-axis, and project the historical measurement values, historical load values, and each historical parameter value into the second spatial rectangular coordinate system to obtain a plurality of second projection points corresponding to each historical external environmental parameter under different fault coefficients; Superimposing the first rectangular coordinate system and the second rectangular coordinate system, for each first projection point corresponding to an external environment parameter, selecting a second projection point with the shortest distance to the corresponding first projection point and having the same historical external environment parameter as the type of the external environment parameter as the reference projection point corresponding to the external environment parameter; Obtaining a fault coefficient corresponding to each reference projection point, analyzing the current fault condition of the transformer to be tested based on each fault coefficient, and generating corresponding alarm information when a fault occurs in the transformer to be tested; The method of obtaining the current fault condition of the transformer to be tested according to the fault coefficient analysis and generating corresponding alarm information when the transformer to be tested fails includes: Obtaining weight coefficients corresponding to the external environmental parameters, and calculating a total fault coefficient corresponding to the transformer to be tested based on the fault coefficients corresponding to the reference projection points of the external environmental parameters and the weight coefficients; The total fault coefficient is compared with a preset fault coefficient threshold. When the total fault coefficient is greater than the fault coefficient threshold, it is determined that the transformer to be tested has a fault and a corresponding alarm message is generated. When the total fault coefficient is not greater than the fault coefficient threshold, it is determined that the transformer to be tested has no fault.

2. The transformer status monitoring method according to claim 1, wherein: Before obtaining the measured values of the current internal parameters of the transformer under test, the load value of the load, and the parameter values of various external environmental parameters, the following is also included: Obtaining several initial external environment parameters; For each initial external environmental parameter, obtaining an initial measured value of the internal parameter of the transformer and an initial parameter value of the corresponding initial external environmental parameter under different load values, and calculating a correlation coefficient between the initial parameter value and the initial measured value; The correlation coefficient is compared with a preset correlation coefficient threshold. When the correlation coefficient is greater than the correlation coefficient threshold, the corresponding initial external environment parameter is used as the external environment parameter, and the weight coefficient corresponding to each external environment parameter is determined according to the size of the correlation coefficient corresponding to each external environment parameter.

3. The transformer status monitoring method according to claim 2, wherein: The calculating the correlation coefficient between the initial parameter value and the initial measurement value includes: Calculating a change in an initial measurement value of a corresponding internal parameter between each adjacent detection moment of the initial external environmental parameter; Each of the changes is averaged to obtain a corresponding average change, and the average change is compared with a preset change threshold, and then the correlation coefficient between the initial parameter value corresponding to the initial external environment parameter and the initial measurement value of the internal parameter is determined based on the comparison result.

4. The transformer status monitoring method according to claim 1, wherein: After obtaining the current fault condition of the transformer to be tested according to the fault coefficient analysis and generating corresponding alarm information when the transformer to be tested fails, the method further includes: When a fault occurs in the transformer to be tested, the fault type corresponding to the transformer to be tested is analyzed based on the measured values of the current internal parameters of the transformer to be tested, the load value of the load, and the parameter values of various external environmental parameters. Then, based on the fault type and the total fault coefficient of the transformer to be tested, a corresponding fault handling solution is matched for the transformer to be tested.

5. The transformer status monitoring method according to claim 4, characterized in that: The analysis of the fault type corresponding to the transformer under test based on the measured values of the current internal parameters of the transformer under test, the load value of the load, and the parameter values of various external environmental parameters includes: For each external environmental parameter, obtain a standard parameter value of the external environmental parameter and a standard measured value of the internal parameter of a normal transformer corresponding to the load value, and generate a curve graph between the standard parameter value and the standard measured value with the external environmental parameter as the X-axis and the internal parameter as the Y-axis; In the curve graph, obtaining a standard measurement value corresponding to each parameter value, comparing the standard measurement value with the measurement value, and obtaining a difference between the standard measurement value and the measurement value; Taking the external environmental parameter with the largest difference between the standard measurement value and the measurement value as the target external environmental parameter, and obtaining several fault types corresponding to the target external environmental parameter; Extracting, based on the internal parameter fault values of the transformer corresponding to each of the fault types, internal parameter fault features of each of the internal parameter fault values, and extracting a current internal parameter feature corresponding to the measured value of the current internal parameter of the transformer to be tested, comparing the current internal parameter feature with each of the internal parameter fault features, and then selecting, based on the comparison result, the internal parameter fault feature that is most similar to the current internal parameter feature as a target internal parameter fault feature; The fault type corresponding to the target internal parameter fault characteristic is used as the fault type of the transformer to be tested.

6. The transformer status monitoring method according to claim 5, characterized in that: The step of matching a corresponding fault handling solution for the transformer to be tested according to the fault type and the total fault coefficient of the transformer to be tested includes: According to the fault type, obtaining several fault handling solutions corresponding to the fault type from a preset database; Obtaining the implementation time, implementation cost, and implementation effect of each of the fault handling solutions, and analyzing and obtaining a priority coefficient of each of the fault handling solutions based on the implementation time, implementation cost, and implementation effect; A corresponding fault handling solution is selected for the transformer to be tested according to the priority coefficients of the fault handling solutions and the total fault coefficient of the transformer to be tested.

7. A transformer status monitoring device, characterized in that: include: Parameter value acquisition module, first space rectangular coordinate system construction module, second space rectangular coordinate system construction module, reference projection point selection module and transformer fault analysis module; The parameter value acquisition module is used to obtain the measured values of the current internal parameters of the transformer to be tested, the load value of the load, and the parameter values of various external environmental parameters; wherein the measured values include: voltage, current or oil temperature; the parameter values include: temperature, humidity and dust content; The first spatial rectangular coordinate system construction module is configured to establish a corresponding first spatial rectangular coordinate system with the external environmental parameter as the X-axis, the internal parameter as the Y-axis, and the load as the Z-axis, and project the measurement value, the load value, and each parameter value into the first spatial rectangular coordinate system to obtain a plurality of first projection points corresponding to each external environmental parameter; The second spatial rectangular coordinate system construction module is used to obtain historical measurement values of historical internal parameters, historical load values of historical loads, and historical parameter values of various historical external environmental parameters of the transformer under different fault coefficients, establish a corresponding second spatial rectangular coordinate system with the historical external environmental parameters as the X-axis, the historical internal parameters as the Y-axis, and the historical load as the Z-axis, and project the historical measurement values, historical load values, and various historical parameter values into the second spatial rectangular coordinate system to obtain a plurality of second projection points corresponding to various historical external environmental parameters under different fault coefficients; The reference projection point selection module is configured to superimpose the first rectangular space coordinate system and the second rectangular space coordinate system, and for each first projection point corresponding to an external environment parameter, select a second projection point having the shortest distance to the corresponding first projection point and having the same historical external environment parameter as the type of the external environment parameter as the reference projection point corresponding to the external environment parameter; The transformer fault analysis module is used to obtain the fault coefficient corresponding to each reference projection point, analyze the current fault condition of the transformer under test based on each fault coefficient, and generate corresponding alarm information when the transformer under test fails; The method of obtaining the current fault condition of the transformer to be tested according to the fault coefficient analysis and generating corresponding alarm information when the transformer to be tested fails includes: Obtaining weight coefficients corresponding to the external environmental parameters, and calculating a total fault coefficient corresponding to the transformer to be tested based on the fault coefficients corresponding to the reference projection points of the external environmental parameters and the weight coefficients; The total fault coefficient is compared with a preset fault coefficient threshold. When the total fault coefficient is greater than the fault coefficient threshold, it is determined that the transformer to be tested has a fault and a corresponding alarm message is generated. When the total fault coefficient is not greater than the fault coefficient threshold, it is determined that the transformer to be tested has no fault.

8. A terminal device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the transformer condition monitoring method according to any one of claims 1 to 6 when executing the computer program.

9. A storage medium, characterized in that: The storage medium includes a stored computer program, wherein when the computer program is running, the device where the storage medium is located is controlled to execute the transformer state monitoring method according to any one of claims 1 to 6.

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