Transformer fault judgment method and device based on monitoring of concentration of dissolved gas in oil, terminal equipment and storage medium

Abstract

The invention discloses a transformer fault judgment method and device based on dissolved gas concentration monitoring in oil, terminal equipment and a storage medium, and belongs to the technical field of transformer fault judgment. The method comprises the following steps: acquiring current air humidity, dissolved gas concentration, electric power load, operating temperature and historical dissolved gas concentration data; calculating a historical dissolved gas concentration growth index and a current operation state influence coefficient, and then calculating a current gas concentration detection threshold value; comparing the current dissolved gas concentration with the current gas concentration detection threshold value, and judging whether the to-be-detected transformer has an operation fault or not according to the comparison result of the gas concentration detection threshold value. Through the implementation of the method and the device, the problem that in the prior art, a fixed gas concentration threshold value cannot adapt to the dynamic change of the operation state of the transformer, so that the operation fault condition of the transformer is misjudged can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer fault judgment, and in particular to a transformer fault judgment method, device, terminal equipment and storage medium based on dissolved gas concentration monitoring in oil. Background Art

[0002] The dissolved gas monitoring method is used to monitor and analyze the composition and concentration of dissolved gases in transformer insulating oil to evaluate the operating status of the equipment, diagnose potential faults and predict equipment life. It is an important technical means to ensure the safe operation of equipment and prevent accidents.

[0003] In existing technology, a fixed gas concentration threshold is typically used to compare the separated gas concentration. This comparison is then used to determine whether the gas concentration in the transformer exceeds the specified limit, and further to determine whether the transformer has an operational fault. However, in practice, the transformer's operating state can affect the gas concentration. In this case, a fixed threshold cannot adapt to the dynamic changes in the transformer's operating state. Consequently, the fault diagnosis results obtained using this fixed threshold are less accurate, leading to misjudgments of transformer operational faults. Summary of the Invention

[0004] The present invention provides a transformer fault diagnosis method, apparatus, terminal device, and storage medium based on dissolved gas concentration monitoring in oil. This method addresses the existing problem that, because the transformer's operating state affects the gas concentration value in actual situations, a fixed gas concentration threshold cannot adapt to the dynamic changes in the transformer's operating state. This reduces the accuracy of the fault diagnosis results obtained using this fixed threshold, leading to misjudgments of transformer operating faults.

[0005] An embodiment of the present invention provides a transformer fault diagnosis method based on monitoring of dissolved gas concentration in oil, comprising:

[0006] Obtain the current air humidity, the current dissolved gas concentration of the transformer to be tested, the current electric power load of the transformer to be tested, the current operating temperature of the transformer to be tested, and the historical dissolved gas concentration data of the transformer to be tested;

[0007] Based on the above historical dissolved gas concentration data, the historical dissolved gas concentration growth index is calculated;

[0008] Calculate the current operating state impact coefficient based on the preset operating years impact index, the air humidity, the electric power load, the operating temperature, and the historical dissolved gas concentration growth index;

[0009] Determine the current gas concentration detection threshold based on the current operating state influence coefficient and the preset gas concentration detection threshold;

[0010] The current dissolved gas concentration is compared with the current gas concentration detection threshold, and based on the comparison result of the gas concentration detection threshold, it is determined whether the transformer to be tested has an operating fault.

[0011] Furthermore, the historical dissolved gas concentration growth index is calculated based on the historical dissolved gas concentration data, including:

[0012] Obtain the total number of historical concentration detections corresponding to the above historical dissolved gas concentration data; wherein each historical dissolved gas concentration corresponds to one historical concentration detection number;

[0013] Based on the above historical dissolved gas concentration data, the average historical dissolved gas concentration is calculated;

[0014] From the above historical dissolved gas concentration data, the maximum historical dissolved gas concentration is extracted;

[0015] The above-mentioned historical dissolved gas concentration growth index is calculated based on the above-mentioned total historical concentration detection times, the above-mentioned average historical dissolved gas concentration and the above-mentioned maximum historical dissolved gas concentration.

[0016] Furthermore, the above-mentioned determination of the current gas concentration detection threshold value based on the current operating state influence coefficient and the preset gas concentration detection threshold value includes:

[0017] If the current operating state influence coefficient is less than the preset minimum influence coefficient threshold, or greater than the preset maximum influence coefficient threshold, the current gas concentration detection threshold is calculated according to the threshold calculation formula, the current operating state influence coefficient, and the preset gas concentration detection threshold; otherwise, the preset gas concentration detection threshold is used as the current gas concentration detection threshold;

[0018] The above threshold calculation formula is:

[0019]

[0020] Where, v a Indicates the gas concentration detection threshold at the ath concentration detection, yz y Indicates the preset gas concentration detection threshold, f c Represents the preset adjustment coefficient comparison table function, f c (w a ) means that when the operating state influence coefficient is w a The adjustment coefficient when , w1 represents the preset minimum influence coefficient threshold, and w2 represents the preset maximum influence coefficient threshold.

[0021] Furthermore, judging whether the transformer under test has an operating fault based on the comparison result of the gas concentration detection threshold value includes:

[0022] If the current dissolved gas concentration is less than the current gas concentration detection threshold, it is determined that there is no operating fault in the transformer to be tested;

[0023] Otherwise, it is determined that the transformer under test has an operating fault.

[0024] Based on the above method embodiment, the present invention provides a corresponding device embodiment;

[0025] The present invention provides a transformer fault judgment device based on monitoring of dissolved gas concentration in oil, comprising:

[0026] Data acquisition module, historical dissolved gas concentration growth index calculation module, operation status influence coefficient calculation module, gas concentration detection threshold calculation module and transformer fault judgment module;

[0027] The data acquisition module is used to obtain the current air humidity, the current dissolved gas concentration of the transformer to be tested, the current electric power load of the transformer to be tested, the current operating temperature of the transformer to be tested, and the historical dissolved gas concentration data of the transformer to be tested;

[0028] The historical dissolved gas concentration growth index calculation module is used to calculate the historical dissolved gas concentration growth index based on the historical dissolved gas concentration data;

[0029] The operating state influence coefficient calculation module is used to calculate the current operating state influence coefficient based on the preset operating years influence index, the air humidity, the electric power load, the operating temperature and the historical dissolved gas concentration growth index;

[0030] The gas concentration detection threshold calculation module is used to determine the current gas concentration detection threshold based on the current operating state influence coefficient and the preset gas concentration detection threshold;

[0031] The transformer fault judgment module is used to compare the current dissolved gas concentration with the current gas concentration detection threshold, and judge whether the transformer to be tested has an operating fault based on the comparison result of the gas concentration detection threshold.

[0032] Furthermore, the above-mentioned historical dissolved gas concentration growth index calculation module includes:

[0033] Total historical concentration detection times acquisition unit, average historical dissolved gas concentration calculation unit, maximum historical dissolved gas concentration extraction unit, data calculation unit;

[0034] The total historical concentration detection times acquisition unit is used to acquire the total historical concentration detection times corresponding to the historical dissolved gas concentration data; wherein each historical dissolved gas concentration corresponds to one historical concentration detection times;

[0035] The above-mentioned average historical dissolved gas concentration calculation unit is used to calculate the average historical dissolved gas concentration based on the above-mentioned historical dissolved gas concentration data;

[0036] The maximum historical dissolved gas concentration extraction unit is used to extract the maximum historical dissolved gas concentration from the historical dissolved gas concentration data;

[0037] The data calculation unit is used to calculate the historical dissolved gas concentration growth index based on the total number of historical concentration detection times, the average historical dissolved gas concentration and the maximum historical dissolved gas concentration.

[0038] Furthermore, the gas concentration detection threshold calculation module includes:

[0039] an operating state influence coefficient comparison unit, configured to calculate the current gas concentration detection threshold according to a threshold calculation formula, the current operating state influence coefficient, and the preset gas concentration detection threshold if the current operating state influence coefficient is less than a preset minimum influence coefficient threshold, or greater than a preset maximum influence coefficient threshold; otherwise, use the preset gas concentration detection threshold as the current gas concentration detection threshold;

[0040] The above threshold calculation formula is:

[0041]

[0042] Where, v a Indicates the gas concentration detection threshold at the ath concentration detection, yz y Indicates the preset gas concentration detection threshold, f c Represents the preset adjustment coefficient comparison table function, f c (w a ) means that when the operating state influence coefficient is w a The adjustment coefficient when , w1 represents the preset minimum impact coefficient threshold, and w2 represents the preset maximum impact coefficient threshold.

[0043] Furthermore, the transformer fault judgment module includes:

[0044] The dissolved gas concentration comparison unit is used to determine that the transformer under test does not have an operating fault if the current dissolved gas concentration is less than the current gas concentration detection threshold; otherwise, determine that the transformer under test has an operating fault.

[0045] Based on the above method embodiment, the present invention provides a corresponding terminal device embodiment;

[0046] The present invention provides a terminal device, including 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, it implements the transformer fault judgment method based on dissolved gas concentration monitoring in oil described in any embodiment of the present invention.

[0047] Based on the above method embodiment, the present invention provides a storage medium embodiment;

[0048] The present invention provides a storage medium comprising 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 method for determining a transformer fault based on monitoring dissolved gas concentration in oil according to any one of the embodiments of the present invention is implemented.

[0049] The embodiments of the present invention have the following beneficial effects:

[0050] The present invention provides a transformer fault judgment method, device, terminal equipment and storage medium based on dissolved gas concentration monitoring in oil. The method includes: obtaining the current air humidity, the current dissolved gas concentration of the transformer to be tested, the current electric power load of the transformer to be tested, the current operating temperature of the transformer to be tested, and the historical dissolved gas concentration data of the transformer to be tested; then, according to the historical dissolved gas concentration data, calculating the historical dissolved gas concentration growth index; then, according to the preset operating years impact index, the air humidity, the electric power load, the operating temperature and the historical dissolved gas concentration growth index, calculating the current operating state influence coefficient; then, according to the current operating state influence coefficient and the preset gas concentration detection threshold, determining the current gas concentration detection threshold; finally, comparing the current dissolved gas concentration with the current gas concentration detection threshold, and judging whether the transformer to be tested has an operating fault according to the comparison result of the gas concentration detection threshold. Therefore, the present invention first calculates the current operating state influence coefficient of the transformer to be tested to determine the influence of the current operating state of the transformer to be tested on the dissolved gas concentration. Then, based on the current operating state influence coefficient and the preset gas concentration detection threshold, the gas concentration detection threshold currently used for operating fault detection and judgment is further calculated and adjusted. Finally, based on the comparison result of this gas concentration detection threshold and the current dissolved gas concentration, the transformer operating fault judgment result obtained can improve the accuracy of the final fault judgment and reduce the possibility of misjudgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0052] Figure 1 The present invention provides a flowchart of a transformer fault diagnosis method based on monitoring of dissolved gas concentration in oil, provided by one embodiment of the present invention.

[0053] Figure 2 The figure is a schematic structural diagram of a transformer fault diagnosis device based on monitoring of dissolved gas concentration in oil provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0054] 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.

[0055] 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.

[0056] 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 relative importance 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 clearly and specifically defined.

[0057] 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.

[0058] 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.

[0059] 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).

[0060] 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.

[0061] See also Figure 1 In order to solve the problem in the prior art that the operating state of the transformer affects the gas concentration value under actual circumstances, resulting in the fixed gas concentration threshold being unable to adapt to the dynamic changes in the transformer operating state, which reduces the accuracy of the fault judgment result obtained using this fixed threshold, thereby causing misjudgment of the transformer operating fault condition. An embodiment of the present invention provides a transformer fault judgment method based on dissolved gas concentration monitoring in oil, comprising:

[0062] Step S101: obtaining the current air humidity, the current dissolved gas concentration of the transformer to be tested, the current electric power load of the transformer to be tested, the current operating temperature of the transformer to be tested, and the historical dissolved gas concentration data of the transformer to be tested;

[0063] Specifically, the historical dissolved gas concentration data includes historical dissolved gas concentrations obtained from several dissolved gas concentration detections in the past, starting from the last dissolved gas concentration detection.

[0064] Specifically, the dissolved gas concentration is the H2 concentration. The dissolved gas concentration is detected by sampling the dissolved gas from the bottom of the transformer's oil tank or using a dedicated sampling valve. Gas chromatography utilizes differences in the distribution coefficients of dissolved gases within the chromatographic column to separate and quantitatively analyze the sampled dissolved gas to determine the dissolved gas concentration. Therefore, this method can be used to determine the dissolved gas concentration at any number of detections.

[0065] Preferably, in the above-mentioned method for detecting dissolved gas concentration, the dissolved gas concentration is obtained based on gas chromatography, which has the advantages of high sensitivity, simple processing and low cost, and can improve the detection efficiency of dissolved gas concentration.

[0066] Step S102: Calculating a historical dissolved gas concentration growth index based on the historical dissolved gas concentration data;

[0067] In a preferred embodiment, the calculation of the historical dissolved gas concentration growth index based on the historical dissolved gas concentration data includes:

[0068] Obtain the total number of historical concentration detections corresponding to the above historical dissolved gas concentration data; wherein each historical dissolved gas concentration corresponds to one historical concentration detection number;

[0069] Based on the above historical dissolved gas concentration data, the average historical dissolved gas concentration is calculated;

[0070] From the above historical dissolved gas concentration data, the maximum historical dissolved gas concentration is extracted;

[0071] The above-mentioned historical dissolved gas concentration growth index is calculated based on the above-mentioned total historical concentration detection times, the above-mentioned average historical dissolved gas concentration and the above-mentioned maximum historical dissolved gas concentration.

[0072] Specifically, the historical dissolved gas concentration data is first used to generate a historical concentration change curve. Based on the historical concentration change curve, the historical dissolved gas concentration at each historical concentration test, the average historical dissolved gas concentration, the maximum historical dissolved gas concentration, and the total number of historical concentration tests, the historical dissolved gas concentration growth index is calculated. The historical dissolved gas concentration growth index is calculated using the following formula:

[0073]

[0074] Where k a represents the historical dissolved gas concentration growth index before the ath concentration detection, t1 represents the first historical concentration detection in the total number of historical concentration detections, t a represents the last historical concentration detection before the ath historical concentration detection, f(s) represents the historical concentration change curve, p a represents the total number of historical concentration detections before the ath concentration detection, i represents the i-th concentration detection, s i Indicates the historical dissolved gas concentration at the time of the i-th concentration detection in the total number of historical concentration detections. Indicates all s i The average value, s imax Indicates all s i The maximum value in .

[0075] Preferably, according to this formula, the historical dissolved gas concentration growth index corresponding to any concentration detection before it can be calculated. If it is necessary to calculate the historical dissolved gas concentration growth index before the current concentration detection, the parameter k in the formula is a That is, it represents the above historical dissolved gas concentration growth index before the current concentration detection.

[0076] In this preferred embodiment, the historical dissolved gas concentration growth index is calculated based on the historical dissolved gas concentration data.

[0077] Step S103: Calculating a current operating state impact coefficient based on a preset operating years impact index, the air humidity, the electric power load, the operating temperature, and the historical dissolved gas concentration growth index;

[0078] Specifically, after assigning a value of 1 to the operating age of the transformer to be tested, several operating age impact indices are generated, with values ​​ranging from 1 to 1.2 and increasing as the operating age of the transformer increases. The current corresponding operating age impact index is then extracted from the indices and used as the preset operating age impact index. For example, the corresponding operating age impact indices under different operating ages are shown in the following table:

[0079]

[0080] Specifically, the operating status influence coefficient is calculated using the following formula:

[0081]

[0082] Where w a Indicates the operating status influence coefficient at the ath concentration detection, fz a represents the electric power load at the ath concentration detection, fz y Indicates the preset electric power load, wd a Indicates the operating temperature at the ath concentration test, wd y Indicates the preset operating temperature, sd a Indicates the air humidity at the ath concentration test, sd y Indicates the preset air humidity. It represents the impact index of preset operating years, x1 represents the weight coefficient corresponding to the electric power load, which is used to represent the degree of influence of the value range of the electric power load at the a-th concentration detection on the operating state of the transformer to be tested, and is obtained based on the test, x2 represents the weight coefficient corresponding to the operating temperature, which is used to represent the degree of influence of the value range of the operating temperature at the a-th concentration detection on the operating state of the transformer to be tested, and is obtained based on the test, x3 represents the weight coefficient corresponding to the air humidity, which is used to represent the degree of influence of the value range of the air humidity at the a-th concentration detection on the operating state of the transformer to be tested, and is obtained based on the test.

[0083] Step S104: determining a current gas concentration detection threshold according to the current operating state influence coefficient and a preset gas concentration detection threshold;

[0084] In a preferred embodiment, the above-mentioned determination of the current gas concentration detection threshold value based on the current operating state influence coefficient and the preset gas concentration detection threshold value includes:

[0085] If the current operating state influence coefficient is less than the preset minimum influence coefficient threshold, or greater than the preset maximum influence coefficient threshold, the current gas concentration detection threshold is calculated according to the threshold calculation formula, the current operating state influence coefficient, and the preset gas concentration detection threshold; otherwise, the preset gas concentration detection threshold is used as the current gas concentration detection threshold;

[0086] The above threshold calculation formula is:

[0087]

[0088] Where, v a Indicates the gas concentration detection threshold at the ath concentration detection, yz y Indicates the preset gas concentration detection threshold, f c Represents the preset adjustment coefficient comparison table function, f c (w a ) means that when the operating state influence coefficient is w a The adjustment coefficient when , w1 represents the preset minimum influence coefficient threshold, and w2 represents the preset maximum influence coefficient threshold.

[0089] Specifically, the specific value of the above-mentioned preset adjustment coefficient reference table function is selected and set according to the different value ranges of the operating status influence coefficient and the degree of influence on the gas concentration detection threshold of the dissolved gas in oil. In the existing technology, it is usually obtained by processing the numerical value of the operating status influence coefficient by a deep learning model.

[0090] Schematically, the above-mentioned preset maximum influence coefficient threshold and the preset minimum influence coefficient threshold generate a threshold interval. If the current operating state influence coefficient is within this threshold interval, it indicates that the generation of H2 will not increase under the current operating state of the transformer to be tested, so there is no need to adjust the preset gas concentration detection threshold; if the current operating state influence coefficient is less than the above-mentioned preset minimum influence coefficient threshold, it indicates that the transformer to be tested will reduce the generation of H2 under the current operating state, so it is necessary to increase the current gas concentration detection threshold to avoid false alarms; if the current operating state influence coefficient is greater than the above-mentioned preset maximum influence coefficient threshold, it indicates that the transformer to be tested will increase the generation of H2 under the current operating state, so it is necessary to lower the current gas concentration detection threshold to improve the detection sensitivity.

[0091] Preferably, the gas concentration detection threshold value during the a-th concentration detection is calculated based on the operating status influence coefficient during the a-th concentration detection, and the operating status influence coefficient during the a-th concentration detection is calculated based on diversified data, including a preset operating years impact index, a historical dissolved gas concentration growth index prior to the a-th concentration detection, electric power load, air humidity, and operating temperature. Therefore, diversified data can improve data accuracy and reliability, thereby improving the accuracy of the calculation result of the gas concentration detection threshold value during the a-th concentration detection and enabling dynamic adjustment of the threshold value, providing accurate and reliable data for subsequent analysis of whether there is a fault in transformer operation.

[0092] In this preferred embodiment, the current gas concentration detection threshold is calculated based on the influence coefficient comparison result, the current operating state influence coefficient, and the preset gas concentration detection threshold.

[0093] Step S105: comparing the current dissolved gas concentration with the current gas concentration detection threshold, and judging whether the transformer to be tested has an operating fault based on the comparison result of the gas concentration detection threshold.

[0094] In a preferred embodiment, judging whether the transformer under test has an operating fault based on the comparison result of the gas concentration detection threshold value includes:

[0095] If the current dissolved gas concentration is less than the current gas concentration detection threshold, it is determined that there is no operating fault in the transformer to be tested;

[0096] Otherwise, it is determined that the transformer under test has an operating fault.

[0097] Preferably, the current dissolved gas concentration is compared with the current gas concentration detection threshold. Since the gas concentration detection threshold during the a-th concentration detection is determined based on the dynamic changes in the transformer operating state, the reliability of the data is relatively high. On this basis, through this comparison method, an accurate judgment can be made on the current dissolved gas concentration, and further an accurate judgment can be made on whether there is a fault in the operation of the transformer, thereby avoiding misjudgment.

[0098] In this preferred embodiment, the result of judging whether there is a fault in the transformer to be tested is obtained by comparing the gas concentration detection threshold value results.

[0099] Based on the above method embodiments, the present invention provides corresponding device embodiments.

[0100] like Figure 2 As shown, an embodiment of the present invention provides a transformer fault diagnosis device based on monitoring of dissolved gas concentration in oil, comprising:

[0101] Data acquisition module, historical dissolved gas concentration growth index calculation module, operation status influence coefficient calculation module, gas concentration detection threshold calculation module and transformer fault judgment module;

[0102] The data acquisition module is used to obtain the current air humidity, the current dissolved gas concentration of the transformer to be tested, the current electric power load of the transformer to be tested, the current operating temperature of the transformer to be tested, and the historical dissolved gas concentration data of the transformer to be tested;

[0103] The historical dissolved gas concentration growth index calculation module is used to calculate the historical dissolved gas concentration growth index based on the historical dissolved gas concentration data;

[0104] The operating state influence coefficient calculation module is used to calculate the current operating state influence coefficient based on the preset operating years influence index, the air humidity, the electric power load, the operating temperature and the historical dissolved gas concentration growth index;

[0105] The gas concentration detection threshold calculation module is used to determine the current gas concentration detection threshold based on the current operating state influence coefficient and the preset gas concentration detection threshold;

[0106] The transformer fault judgment module is used to compare the current dissolved gas concentration with the current gas concentration detection threshold, and judge whether the transformer to be tested has an operating fault based on the comparison result of the gas concentration detection threshold.

[0107] In a preferred embodiment, the historical dissolved gas concentration growth index calculation module includes:

[0108] Total historical concentration detection times acquisition unit, average historical dissolved gas concentration calculation unit, maximum historical dissolved gas concentration extraction unit, data calculation unit;

[0109] The total historical concentration detection times acquisition unit is used to acquire the total historical concentration detection times corresponding to the historical dissolved gas concentration data; wherein each historical dissolved gas concentration corresponds to one historical concentration detection times;

[0110] The above-mentioned average historical dissolved gas concentration calculation unit is used to calculate the average historical dissolved gas concentration based on the above-mentioned historical dissolved gas concentration data;

[0111] The maximum historical dissolved gas concentration extraction unit is used to extract the maximum historical dissolved gas concentration from the historical dissolved gas concentration data;

[0112] The data calculation unit is used to calculate the historical dissolved gas concentration growth index based on the total number of historical concentration detection times, the average historical dissolved gas concentration and the maximum historical dissolved gas concentration.

[0113] In another preferred embodiment, the gas concentration detection threshold calculation module includes:

[0114] an operating state influence coefficient comparison unit, configured to calculate the current gas concentration detection threshold according to a threshold calculation formula, the current operating state influence coefficient, and the preset gas concentration detection threshold if the current operating state influence coefficient is less than a preset minimum influence coefficient threshold, or greater than a preset maximum influence coefficient threshold; otherwise, use the preset gas concentration detection threshold as the current gas concentration detection threshold;

[0115] The above threshold calculation formula is:

[0116]

[0117] Where, v a Indicates the gas concentration detection threshold at the ath concentration detection, yz y Indicates the preset gas concentration detection threshold, f c Represents the preset adjustment coefficient comparison table function, f c (w a ) means that when the operating state influence coefficient is w a The adjustment coefficient when , w1 represents the preset minimum impact coefficient threshold, and w2 represents the preset maximum impact coefficient threshold.

[0118] In another preferred embodiment, the transformer fault judgment module includes:

[0119] The dissolved gas concentration comparison unit is used to determine that the transformer under test does not have an operating fault if the current dissolved gas concentration is less than the current gas concentration detection threshold; otherwise, determine that the transformer under test has an operating fault.

[0120] It should be noted that the device embodiments described above are merely schematic, wherein the modules described above as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, 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 can be specifically implemented as one or more communication buses or signal lines. A person of ordinary skill in the art can understand and implement it without expending creative effort. The above schematic diagram is merely an example of a transformer fault judgment device based on monitoring of dissolved gas concentration in oil, and does not constitute a limitation on a transformer fault judgment device based on monitoring of dissolved gas concentration in oil. It may include more or fewer components than shown in the figure, or a combination of certain components, or different components.

[0121] Based on the above method embodiment, the present invention provides a corresponding terminal device embodiment.

[0122] Another embodiment of the present invention provides a terminal device, including a processor, a memory, and a computer program stored in the above memory and configured to be executed by the above processor. When the above processor executes the above computer program, it implements the transformer fault judgment method based on dissolved gas concentration monitoring in oil described in any embodiment of the present invention.

[0123] For example, in this embodiment, the computer program may be divided into one or more modules, which are stored in the memory and executed by the processor to implement the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program in the device.

[0124] The terminal device may be a computing device such as a desktop computer, a notebook computer, a PDA, or a cloud server. The device may include, but is not limited to, a processor and a memory;

[0125] 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. The general-purpose processor may be a microprocessor or any conventional processor. The processor is the control center of the device, connecting the various parts of the device using various interfaces and lines.

[0126] The above-mentioned memory can be used to store the above-mentioned computer programs and / or modules. The above-mentioned processor realizes various functions of the above-mentioned device by running or executing the computer programs and / or modules stored in the above-mentioned memory, and calling the data stored in the memory. The above-mentioned 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.; 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 (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0127] Based on the above method embodiment, the present invention provides a corresponding storage medium embodiment.

[0128] 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 fault judgment method based on dissolved gas concentration monitoring in oil according to any embodiment of the present invention.

[0129] In this embodiment, the storage medium is a computer-readable storage medium, and the computer program includes computer program code, which may be in source code form, object code form, an executable file, or some intermediate form. The computer-readable medium may include any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a mobile hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunications signal, and a software distribution medium.

[0130] 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 fault diagnosis method based on monitoring of dissolved gas concentration in oil, characterized in that: include: Obtain the current air humidity, the current dissolved gas concentration of the transformer to be tested, the current electric power load of the transformer to be tested, the current operating temperature of the transformer to be tested, and the historical dissolved gas concentration data of the transformer to be tested; Calculating a historical dissolved gas concentration growth index based on the historical dissolved gas concentration data; Calculating a current operating state impact coefficient based on a preset operating years impact index, the air humidity, the electric power load, the operating temperature, and the historical dissolved gas concentration growth index; Determine the current gas concentration detection threshold based on the current operating state influence coefficient and the preset gas concentration detection threshold; The current dissolved gas concentration is compared with the current gas concentration detection threshold, and based on the comparison result of the gas concentration detection threshold, it is determined whether the transformer to be tested has an operating fault.

2. A transformer fault diagnosis method based on monitoring of dissolved gas concentration in oil according to claim 1, characterized in that: The calculating of the historical dissolved gas concentration growth index based on the historical dissolved gas concentration data includes: Obtaining the total number of historical concentration detections corresponding to the historical dissolved gas concentration data; wherein each historical dissolved gas concentration corresponds to one historical concentration detection number; Calculating an average historical dissolved gas concentration based on the historical dissolved gas concentration data; Extracting the maximum historical dissolved gas concentration from the historical dissolved gas concentration data; The historical dissolved gas concentration growth index is calculated based on the total number of historical concentration detections, the average historical dissolved gas concentration, and the maximum historical dissolved gas concentration.

3. The transformer fault judgment method based on monitoring of dissolved gas concentration in oil according to claim 2 is characterized in that: The determining of the current gas concentration detection threshold according to the current operating state influence coefficient and the preset gas concentration detection threshold includes: If the current operating state influence coefficient is less than the preset minimum influence coefficient threshold, or greater than the preset maximum influence coefficient threshold, the current gas concentration detection threshold is calculated according to the threshold calculation formula, the current operating state influence coefficient, and the preset gas concentration detection threshold; otherwise, the preset gas concentration detection threshold is used as the current gas concentration detection threshold; The threshold calculation formula is: Where, v a Indicates the gas concentration detection threshold at the ath concentration detection, yz y Indicates the preset gas concentration detection threshold, f c Represents the preset adjustment coefficient comparison table function, f c (w a ) means that when the operating state influence coefficient is w a The adjustment coefficient when , w1 represents the preset minimum impact coefficient threshold, and w2 represents the preset maximum impact coefficient threshold.

4. A transformer fault diagnosis method based on monitoring of dissolved gas concentration in oil according to claim 3, characterized in that: The step of determining whether the transformer under test has an operating fault based on the comparison result of the gas concentration detection threshold value includes: If the current dissolved gas concentration is less than the current gas concentration detection threshold, it is determined that there is no operating fault in the transformer to be tested; Otherwise, it is determined that the transformer to be tested has an operating fault.

5. A transformer fault diagnosis device based on monitoring of dissolved gas concentration in oil, characterized in that: include: Data acquisition module, historical dissolved gas concentration growth index calculation module, operation status influence coefficient calculation module, gas concentration detection threshold calculation module and transformer fault judgment module; The data acquisition module is used to obtain the current air humidity, the current dissolved gas concentration of the transformer to be tested, the current electric power load of the transformer to be tested, the current operating temperature of the transformer to be tested, and the historical dissolved gas concentration data of the transformer to be tested; The historical dissolved gas concentration growth index calculation module is used to calculate the historical dissolved gas concentration growth index based on the historical dissolved gas concentration data; The operating state influence coefficient calculation module is used to calculate the current operating state influence coefficient based on the preset operating years influence index, the air humidity, the electric power load, the operating temperature and the historical dissolved gas concentration growth index; The gas concentration detection threshold calculation module is used to determine the current gas concentration detection threshold according to the current operating state influence coefficient and the preset gas concentration detection threshold; The transformer fault judgment module is used to compare the current dissolved gas concentration with the current gas concentration detection threshold, and judge whether the transformer to be tested has an operation fault based on the comparison result of the gas concentration detection threshold.

6. The transformer fault diagnosis device based on monitoring of dissolved gas concentration in oil according to claim 5, characterized in that: The historical dissolved gas concentration growth index calculation module includes: Total historical concentration detection times acquisition unit, average historical dissolved gas concentration calculation unit, maximum historical dissolved gas concentration extraction unit, data calculation unit; The total historical concentration detection times acquisition unit is used to acquire the total historical concentration detection times corresponding to the historical dissolved gas concentration data; wherein each historical dissolved gas concentration corresponds to one historical concentration detection times; The average historical dissolved gas concentration calculation unit is used to calculate the average historical dissolved gas concentration based on the historical dissolved gas concentration data; The maximum historical dissolved gas concentration extraction unit is used to extract the maximum historical dissolved gas concentration from the historical dissolved gas concentration data; The data calculation unit is used to calculate the historical dissolved gas concentration growth index according to the total number of historical concentration detection times, the average historical dissolved gas concentration, and the maximum historical dissolved gas concentration.

7. The transformer fault diagnosis device based on monitoring of dissolved gas concentration in oil according to claim 6, characterized in that: The gas concentration detection threshold calculation module includes: an operating state influence coefficient comparison unit, configured to calculate the current gas concentration detection threshold according to a threshold calculation formula, the current operating state influence coefficient, and the preset gas concentration detection threshold if the current operating state influence coefficient is less than a preset minimum influence coefficient threshold, or greater than a preset maximum influence coefficient threshold; otherwise, use the preset gas concentration detection threshold as the current gas concentration detection threshold; The threshold calculation formula is: Where, v a Indicates the gas concentration detection threshold at the ath concentration detection, yz y Indicates the preset gas concentration detection threshold, f c Represents the preset adjustment coefficient comparison table function, f c (w a ) means that when the operating state influence coefficient is w a The adjustment coefficient when , w1 represents the preset minimum influence coefficient threshold, and w2 represents the preset maximum influence coefficient threshold.

8. The transformer fault diagnosis device based on monitoring of dissolved gas concentration in oil according to claim 7, characterized in that: The transformer fault judgment module includes: The dissolved gas concentration comparison unit is used to determine that the transformer under test does not have an operating fault if the current dissolved gas concentration is less than the current gas concentration detection threshold; otherwise, determine that the transformer under test has an operating fault.

9. A terminal device, characterized in that: The invention comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein when the processor executes the computer program, a transformer fault judgment method based on monitoring of dissolved gas concentration in oil as claimed in any one of claims 1 to 4 is implemented.

10. 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 fault judgment method based on monitoring of dissolved gas concentration in oil as described in any one of claims 1 to 4.

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