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

Abstract

The invention discloses a transformer state monitoring method and device, terminal equipment and a storage medium. The method comprises the steps of obtaining a measured value of a current internal parameter of a to-be-measured transformer, a load value of a load and a parameter value of each external environment parameter; projecting the measured value, the load value and each parameter value into a space rectangular coordinate system to obtain a plurality of first projection points; projecting historical measured values of historical internal parameters, historical load values of historical loads and historical parameter values of historical external environment parameters of the transformer under different fault coefficients into a space rectangular coordinate system to obtain a plurality of second projection points; selecting a reference projection point corresponding to the first projection point; and according to the fault coefficient corresponding to each reference projection point, analyzing to obtain the current fault condition of the to-be-detected transformer, and when the to-be-detected transformer has a fault, generating corresponding alarm information. According to the invention, the accuracy of transformer state monitoring can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer monitoring, and in particular to a transformer state monitoring method, device, 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 sometimes during operation, which can cause equipment accidents, resulting in casualties and property losses. Therefore, power transformer status monitoring and troubleshooting are particularly important to ensure the safe operation of power grids, and are the core content of power grid equipment operation and management.

[0003] The existing transformer status monitoring method generally collects the real-time internal operating parameters of the transformer, such as the input and output voltage, current or transformer oil temperature of the transformer, through the deployment of sensors, and obtains the current load size of the transformer, matches the corresponding alarm threshold according to the current load size, and then compares the collected real-time internal operating parameter value with the matched alarm threshold. When the real-time internal operating parameter value exceeds the alarm threshold, it is determined that the transformer is faulty and an alarm is issued.

[0004] In this transformer status monitoring method, only the internal operating parameters of the transformer are taken into account, and the monitoring results of the transformer can be obtained by simply comparing the internal operating parameter values ​​collected in real time with the set alarm threshold. However, in actual applications, external environmental factors such as temperature, humidity, and dust in the transformer environment will affect the acquisition accuracy of the sensor or the internal parameters of the transformer. 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 status; 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 making the measured insulation resistance value low, affecting the judgment of the transformer insulation condition. The above method does not take into account the influence of external environmental factors, making the transformer status monitoring results prone to errors, resulting in false alarms or untimely identification of transformer faults. Summary of the invention

[0005] The present invention provides a transformer state monitoring method, device, terminal equipment and storage medium to solve the technical problem that the existing transformer state detection method does not take into account the influence of external environmental factors, which makes the transformer state monitoring result 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 state monitoring method, comprising: 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 various external environmental parameters; wherein the measured values ​​include: voltage, current or oil temperature; the parameter values ​​include: temperature, humidity and dust content; Taking the external environment 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 measurement value, the load value, and each parameter value are projected into the first spatial rectangular coordinate system to obtain a plurality of first projection points corresponding to each external environment 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; The first rectangular coordinate system in space and the second rectangular coordinate system in space are superimposed, and for each first projection point corresponding to an external environment parameter, a second projection point having the shortest distance to the corresponding first projection point and having a historical external environment parameter consistent with the type of the external environment parameter is selected as a reference projection point corresponding to the external environment 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 the analysis of each fault coefficient, and corresponding alarm information is generated when the transformer to be tested fails.

[0007] 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 the transformer to be tested fails, including: Obtaining weight coefficients corresponding to each external environmental parameter, and calculating a total fault coefficient corresponding to the transformer to be tested according to the fault coefficients corresponding to the reference projection points of each external environmental parameter 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.

[0008] 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, it also includes: Obtaining several initial external environment parameters; For each initial external environmental parameter, obtaining an initial measured value of an 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.

[0009] As a preferred solution, the calculating 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; The change amounts are averaged to obtain a corresponding average change amount, and the average change amount is compared with a preset change amount 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 according to the comparison result.

[0010] 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, it also includes: When the transformer under test fails, 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. Then, according to the fault type and the total fault coefficient of the transformer under test, the corresponding fault handling solution is matched for the transformer under test.

[0011] As a preferred solution, 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, 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, a standard measurement value corresponding to each of the parameter values ​​is obtained, and the standard measurement value is compared with the measurement value to obtain 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; According to the internal parameter fault value of the transformer corresponding to each of the fault types, the internal parameter fault feature of each of the internal parameter fault values ​​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 of the internal parameter fault features, 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 characteristic is used as the fault type of the transformer to be tested.

[0012] 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: According to the fault type, obtaining several fault handling solutions corresponding to the fault type in a preset database; Obtaining the implementation time, implementation cost and implementation effect of each of the fault handling solutions, and analyzing and obtaining the priority coefficient of each of the fault handling solutions according to the implementation time, implementation cost and implementation effect; According to the order of the priority coefficients of the fault handling solutions and the total fault coefficient of the transformer to be tested, a corresponding fault handling solution is selected for the transformer to be tested.

[0013] On the basis of the above embodiment, another embodiment of the present invention provides a transformer state monitoring device, including: 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; 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 used to establish a corresponding first spatial rectangular coordinate system with the external environment 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 environment parameter; The second spatial rectangular coordinate system construction module is used to obtain historical measurement values ​​of historical internal parameters of the transformer under different fault coefficients, historical load values ​​of historical loads, and historical parameter values ​​of various historical external environmental parameters, and 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 number of second projection points corresponding to various historical external environmental parameters under different fault coefficients; The reference projection point selection module is used to superimpose the first spatial rectangular coordinate system and the second spatial rectangular coordinate system, and 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 parameter is consistent with 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, obtain the current fault condition of the transformer to be tested according to the analysis of each fault coefficient, and generate corresponding alarm information when the transformer to be tested fails.

[0014] 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, and when the processor executes the computer program, the transformer state monitoring method described in the above invention embodiment is implemented.

[0015] 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 state monitoring method described in the above invention embodiment.

[0016] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: 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 tested, 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 parameters as the X-axis, the historical internal parameters 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 values ​​of the historical load, and the historical parameter values ​​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; 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 the analysis of each fault coefficient 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.

[0017] The present invention comprehensively considers the influence of internal parameters and external environmental parameters on transformer state 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 the 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 parameters of the transformer and the second projection point of the historical parameters under different fault coefficients are compared to match the fault coefficient corresponding to the transformer to be tested, and then the current fault condition of the transformer to be tested is analyzed according to the fault coefficient, thereby improving the transformer state monitoring accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flowchart of a transformer state monitoring method provided by an embodiment of the present invention; Figure 2 It is a structural schematic diagram of a transformer status monitoring device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are 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 creative work are within the scope of protection of this application.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0021] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relativity or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0022] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0023] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0024] 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).

[0025] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0026] Embodiment 1 Please refer to Figure 1 , is a flow chart of a transformer state monitoring method provided by an embodiment of the present invention, comprising the following specific steps: S1. 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; 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, when the correlation coefficient is greater than the correlation coefficient threshold, 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.

[0027] 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 environment 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 environment parameter and the initial measurement value of the internal parameter according to 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.

[0028] Specifically, in the process of transformer status monitoring, since external environmental factors such as temperature, humidity, dust, etc. in the environment where the transformer is located will affect the sensor's acquisition accuracy or the transformer's internal parameters, if only the transformer's internal parameters collected by the sensor are considered to judge the transformer's fault condition, errors are prone to occur. Therefore, the present invention comprehensively considers the transformer's internal parameters and external environmental parameters, 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, and 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 transformer's status monitoring accuracy. Specifically, the transformer status monitoring method described in the present invention specifically includes the following steps: 1. Selection of external environment parameters: First, obtain the initial external environmental parameters in the transformer environment that may affect the transformer status monitoring, and then analyze the degree of influence of each initial external environmental parameter on the measured value of the transformer internal parameter. The initial external environmental parameters with a greater degree of influence are important external environmental parameters, which are used as the external environmental parameters of the transformer. In the subsequent transformer status monitoring process, it is only necessary to collect the parameter values ​​corresponding to these screened external environmental parameters to monitor the transformer status. The screening process of external environmental parameters is as follows: (1) Obtaining initial external environmental parameters that may affect transformer condition monitoring; (2) For each initial external environmental parameter, obtain an initial measurement value of the internal parameter of the transformer under different load values ​​and an 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; The correlation coefficient reflects the influence of the initial external environment parameter on the internal parameter. The greater the change in the initial measurement value of the corresponding internal parameter between adjacent detection moments of the initial external environment parameter, the greater the influence of the change in the initial external environment parameter on the internal parameter, and the greater the correlation between the initial external environment parameter and the internal parameter. Then, the change in the internal parameter between each adjacent detection moment of the initial external environment parameter is averaged, and the average change is compared with the preset change threshold to evaluate the influence of each initial external environment parameter on the internal parameter, and the influence is represented by the correlation coefficient.

[0029] (3) comparing the correlation coefficient with a preset correlation coefficient threshold; when the correlation coefficient is greater than the correlation coefficient threshold, 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.

[0030] The larger the correlation coefficient is, the greater the influence of the initial external environmental parameters on the internal parameters is. By screening the correlation coefficient, the initial external environmental parameters that have a greater influence on the internal parameters are selected as the external environmental parameters that need to be focused on, and 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, and 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.

[0031] 2. Data collection of the transformer to be tested: 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 amount.

[0032] S2, establishing a corresponding first spatial rectangular coordinate system with the external environment 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 environment parameter; 3. Construction of the 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, 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 a plurality of first projection points corresponding to each external environmental parameter.

[0033] In the comprehensive analysis process of external environmental parameters and internal parameters, because the 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 the 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. In response to this problem, the present invention does not need to fit the relationship between the external environmental parameters and the internal parameters, and 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, and then analyzes the current fault condition of the transformer to be tested according to the fault coefficient.

[0034] First, with the external environment 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 environment parameters, and the corresponding load values ​​are projected into the first spatial rectangular coordinate system to obtain a number of first projection points, each of which has an X coordinate of one of the external environment parameters, a Y coordinate of the current measured value of the internal parameter of the transformer, and a Z coordinate of the current load value, and all the 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 environment parameters into the first spatial rectangular coordinate system, for different types of external environment parameters, after removing the dimension of the collected parameter value, the value after removing the dimension is projected into the first spatial rectangular coordinate system.

[0035] S3, obtaining 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, taking 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, establishing a corresponding second spatial rectangular coordinate system, and projecting the historical measurement values, historical load values, and various historical parameter values ​​into the second spatial rectangular coordinate system, to obtain a number of second projection points corresponding to various historical external environmental parameters under different fault coefficients; 4. Construction of the second space 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, a corresponding second spatial rectangular coordinate system is established, and then the historical measured values ​​of the historical internal parameters of the transformer with different known fault degrees (the fault coefficient is used to indicate the fault degree of the transformer, and the larger the fault coefficient, the higher the fault degree of the transformer) and the historical parameter values ​​of the historical external environmental parameters and the corresponding historical load values ​​are projected into the second spatial rectangular coordinate system to obtain a number of second projection points. Under the same fault coefficient, the transformer has several historical parameter values, a historical measurement value, and a load value. Schematically, the relationship between the fault coefficient and the fault degree of the transformer is: ;in, is the fault degree of the transformer, is the failure coefficient, is a natural number greater than 1; S4, superimposing the first spatial rectangular coordinate system and the second spatial rectangular coordinate system, and 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 a historical external environment parameter consistent with the type of the external environment parameter as a reference projection point corresponding to the external environment parameter; 5. Selection of reference projection points: The first spatial rectangular coordinate system and the second spatial rectangular coordinate system are superimposed, and 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.

[0036] S5. Obtain the fault coefficient corresponding to each reference projection point, analyze the current fault condition of the transformer to be tested according to each fault coefficient, and generate corresponding alarm information when the transformer to be tested fails.

[0037] 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, when the total fault coefficient is greater than the fault coefficient threshold, 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, determining that the transformer to be tested does not fail.

[0038] 6. Fault analysis of the transformer to be tested: 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 each external environmental parameter, 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.

[0039] Because there are multiple first projection points (each projection point corresponds to an external environmental parameter), the 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 internal parameter of the transformer), and the total fault coefficient corresponding to the transformer to be tested is calculated according to the fault coefficient corresponding to the reference projection point of each external environmental parameter and the weight coefficient. The total fault coefficient reflects the degree of fault of the transformer to be tested. The higher the total fault coefficient, the higher the degree of fault of the transformer to be tested. When the total fault coefficient is not greater than the preset fault coefficient threshold, it is determined that the fault degree of the transformer to be tested is low. 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 generates corresponding alarm information.

[0040] 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, analyzing and obtaining the fault type corresponding to the transformer to be tested 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 various external environmental parameters, 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.

[0041] 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 of the parameter values, 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 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, and then according to 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 taken as the fault type of the transformer to be tested.

[0042] 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, according to the fault type, several fault handling schemes corresponding to the fault type in a preset database; 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.

[0043] 6. Analysis of fault types of the transformer to be tested: When a fault occurs in the transformer under test, the fault type corresponding to the transformer under test is analyzed according to 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: (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.

[0044] (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.

[0045] (3) According to the internal parameter fault values ​​of the transformer corresponding to each of the fault types, the internal parameter fault features of each of the internal parameter fault values ​​are extracted, and the current internal parameter features corresponding to the measured values ​​of the current internal parameters of the transformer to be tested are extracted, and the current internal parameter features are compared with the internal parameter fault features, and then according to the comparison results, 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.

[0046] 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 according to 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.

[0047] Embodiment 2 Please refer to Figure 2 , is a schematic diagram of the structure of a transformer state 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; 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 used to establish a corresponding first spatial rectangular coordinate system with the external environment 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 environment parameter; The second spatial rectangular coordinate system construction module is used to obtain historical measurement values ​​of historical internal parameters of the transformer under different fault coefficients, historical load values ​​of historical loads, and historical parameter values ​​of various historical external environmental parameters, and 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 number of second projection points corresponding to various historical external environmental parameters under different fault coefficients; The reference projection point selection module is used to superimpose the first spatial rectangular coordinate system and the second spatial rectangular coordinate system, and 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 parameter is consistent with 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, obtain the current fault condition of the transformer to be tested according to the analysis of each fault coefficient, and generate corresponding alarm information when the transformer to be tested fails.

[0048] It should be noted that the device embodiments described above are merely schematic, 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 on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the accompanying 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 may understand and implement it without paying any creative effort.

[0049] Those skilled in the art can 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.

[0050] Embodiment 3 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-mentioned embodiment of the invention when executing the computer program.

[0051] The electronic device may be a computing device such as a desktop computer, a notebook, a palm computer, a cloud server, etc. The device may include, but is not limited to, a processor and a memory.

[0052] 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) or 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, etc. The processor is the control center of the device, and various interfaces and lines are used to connect various parts of the entire device.

[0053] Embodiment 4 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.

[0054] The memory can be used to store the computer program, and the processor realizes various functions of the device by running or executing the computer program stored in the memory and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application required for a function, etc.; the data storage area can store data created according to the use of the mobile phone, etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (FlashCard), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0055] The storage medium is a computer-readable storage medium, and the computer program is stored in the computer-readable storage medium. When the computer program is executed by the processor, the steps of each method embodiment described above can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0056] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle 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 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; Taking the external environment 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 measurement value, the load value, and each parameter value are projected into the first spatial rectangular coordinate system to obtain a plurality of first projection points corresponding to each external environment 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; The first rectangular coordinate system in space and the second rectangular coordinate system in space are superimposed, and for each first projection point corresponding to an external environment parameter, a second projection point having the shortest distance to the corresponding first projection point and having a historical external environment parameter consistent with the type of the external environment parameter is selected as a reference projection point corresponding to the external environment 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 the analysis of each fault coefficient, and corresponding alarm information is generated when the transformer to be tested fails.

2. The transformer state monitoring method according to claim 1, characterized in that: 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 weight coefficients corresponding to each external environmental parameter, and calculating a total fault coefficient corresponding to the transformer to be tested according to the fault coefficients corresponding to the reference projection points of each external environmental parameter 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.

3. The transformer status monitoring method according to claim 2, characterized in that: 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 several initial external environment parameters; For each initial external environmental parameter, obtaining an initial measured value of an 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.

4. The transformer status monitoring method according to claim 3, characterized in that: The calculating the correlation coefficient between the initial parameter value and the initial measurement value comprises: Calculating the change in the initial measurement value of the corresponding internal parameter between each adjacent detection moment of the initial external environmental parameter; The change amounts are averaged to obtain a corresponding average change amount, and the average change amount is compared with a preset change amount 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 according to the comparison result.

5. The transformer status monitoring method according to claim 2, characterized in that: 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 the transformer under test fails, 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. Then, according to the fault type and the total fault coefficient of the transformer under test, the corresponding fault handling solution is matched for the transformer under test.

6. The transformer status monitoring method according to claim 5, characterized in that: 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, 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, a standard measurement value corresponding to each of the parameter values ​​is obtained, and the standard measurement value is compared with the measurement value to obtain 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; According to the internal parameter fault value of the transformer corresponding to each of the fault types, the internal parameter fault feature of each of the internal parameter fault values ​​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 of the internal parameter fault features, 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 characteristic is used as the fault type of the transformer to be tested.

7. The transformer state monitoring method according to claim 6, characterized in that: The matching of 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 in a preset database; Obtaining the implementation time, implementation cost and implementation effect of each of the fault handling solutions, and analyzing and obtaining the priority coefficient of each of the fault handling solutions according to the implementation time, implementation cost and implementation effect; According to the order of the priority coefficients of the fault handling solutions and the total fault coefficient of the transformer to be tested, a corresponding fault handling solution is selected for the transformer to be tested.

8. A transformer status monitoring device, characterized in that: include: 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; 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 used to establish a corresponding first spatial rectangular coordinate system with the external environment 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 environment parameter; The second spatial rectangular coordinate system construction module is used to obtain historical measurement values ​​of historical internal parameters of the transformer under different fault coefficients, historical load values ​​of historical loads, and historical parameter values ​​of various historical external environmental parameters, and 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 number of second projection points corresponding to various historical external environmental parameters under different fault coefficients; The reference projection point selection module is used to superimpose the first spatial rectangular coordinate system and the second spatial rectangular coordinate system, and 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 with a historical external environment parameter consistent with 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, obtain the current fault condition of the transformer to be tested according to the analysis of each fault coefficient, and generate corresponding alarm information when the transformer to be tested fails.

9. 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 state monitoring method according to any one of claims 1 to 7 when executing the computer program.

10. A storage medium, characterized in that: The storage medium includes a stored computer program, wherein when the computer program is executed, 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 7.

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