Equivalent method and device for axial stress failure test model of transformer winding under short circuit

Abstract

The application discloses a transformer short-circuit winding axial stress failure test model equivalent method and device. The application determines a winding prototype and a winding prototype specification according to a transformer to be tested, establishes a winding equivalent model in combination with the winding prototype and the winding prototype specification, carries out an axial stress failure test on the winding equivalent model based on a pre-defined axial stress failure mode, obtains a first axial stress failure characteristic value, carries out an axial stress failure test on the transformer to be tested based on the axial stress failure mode, obtains a second axial stress failure characteristic value, and judges whether the winding equivalent model is taken as a winding axial stress failure test model according to the first axial stress failure characteristic value and the second axial stress failure characteristic value. The winding axial stress failure test model can be established in equivalent for the transformer to be tested, which is favorable for accurately reflecting the winding axial stress failure condition of the transformer to be tested and guaranteeing the equivalence and correctness of the winding axial stress stability research.

Description

Technical Field

[0001] This invention relates to the field of transformer short-circuit withstand testing technology, and in particular to an equivalent method and apparatus for a transformer winding axial force failure test model during a short circuit. Background Technology

[0002] When a transformer is short-circuited, the windings are mainly subjected to axial forces that compress from both ends towards the center and radial forces that compress the inner windings and expand the outer windings. The axial stress stability of the windings is a key factor affecting the transformer's short-circuit withstand capability. Failure mainly occurs with ordinary paper-insulated flat copper wire or composite conductors, and its failure modes include failure between conductors, failure of the coil, and failure of end supports and clamping structures.

[0003] Currently, to study the axial stress stability of 220kV transformer windings, scaled-down models are mainly used to conduct axial stress failure tests on transformer windings under short circuits. Since the equivalent winding model uses an elastic system composed of conductors and spacers, its axial stress is affected by this elastic system. Therefore, it is impossible to complete the equivalent simulation by reducing the number of segments, making it difficult to accurately reflect the axial stress failure of the transformer windings under test, and thus failing to guarantee the equivalence and accuracy of the study on the axial stress stability of the windings. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides an equivalent method and apparatus for a test model of axial stress failure of transformer windings under short circuit. This method can establish an equivalent test model of axial stress failure of the windings for the transformer under test, which is beneficial to accurately reflect the axial stress failure of the windings of the transformer under test and ensure the equivalence and correctness of the study on the stability of axial stress of windings.

[0005] To address the aforementioned technical problems, in a first aspect, an embodiment of the present invention provides an equivalent method for a test model of axial force failure of transformer windings during short circuits, comprising:

[0006] Based on the transformer to be tested, determine the winding prototype and its specifications, and then establish an equivalent winding model by combining the winding prototype and its specifications.

[0007] Based on a predefined axial stress failure mode, an axial stress failure test is performed on the equivalent model of the winding to obtain the first axial stress failure characteristic value.

[0008] Based on the axial stress failure mode, an axial stress failure test was conducted on the transformer under test to obtain the second axial stress failure characteristic value.

[0009] Based on the first axial force failure characteristic value and the second axial force failure characteristic value, determine whether to use the winding equivalent model as the winding axial force failure test model.

[0010] Furthermore, determining the winding prototype and its specifications based on the transformer under test specifically includes:

[0011] The prototype of the winding is determined based on the structure and number of segments of the winding of the transformer to be tested;

[0012] The specifications of the winding prototype are determined based on predefined axial stress failure test conditions; wherein, the specifications of the winding prototype include dimensional proportions.

[0013] Furthermore, based on a predefined axial stress failure mode, an axial stress failure test is conducted on the equivalent model of the winding to obtain a first axial stress failure characteristic value, specifically including:

[0014] According to the axial force failure test standard of the transformer under test, based on the axial force failure mode, the winding equivalent model is subjected to axial force failure test to obtain the first axial force failure characteristic value; wherein, the axial force failure test standard of the transformer under test includes the standard operating parameters and standard structural parameters of the transformer under test.

[0015] Further, the step of determining whether to use the winding equivalent model as the winding axial force failure test model based on the first axial force failure characteristic value and the second axial force failure characteristic value specifically involves:

[0016] The first axial force failure characteristic value and the second axial force failure characteristic value are compared with the preset control range respectively;

[0017] If both the first axial force failure characteristic value and the second axial force failure characteristic value are within the preset control range, then the winding equivalent model is determined to be the winding axial force failure test model.

[0018] If the first axial force failure characteristic value or the second axial force failure characteristic value is not within the preset control range, then it is determined that the winding equivalent model will not be used as the winding axial force failure test model.

[0019] Furthermore, the equivalent method for the transformer winding axial force failure test model during short circuit also includes:

[0020] When it is determined that the winding equivalent model should not be used as the winding axial force failure test model, the winding equivalent model is adjusted and a new winding equivalent model is established.

[0021] Secondly, an embodiment of the present invention provides an equivalent device for a test model of axial force failure of a transformer winding during a short circuit, comprising:

[0022] The winding equivalent model establishment module is used to determine the winding prototype and its specifications based on the transformer under test, and to establish a winding equivalent model in combination with the winding prototype and its specifications.

[0023] The first axial stress failure test module is used to perform axial stress failure tests on the winding equivalent model based on a predefined axial stress failure mode to obtain the first axial stress failure characteristic value.

[0024] The second axial force failure test module is used to conduct an axial force failure test on the transformer under test based on the axial force failure mode, and obtain the second axial force failure characteristic value.

[0025] The winding equivalent model judgment module is used to determine whether to use the winding equivalent model as the winding axial force failure test model based on the first axial force failure characteristic value and the second axial force failure characteristic value.

[0026] Furthermore, the winding equivalent model establishment module includes:

[0027] The winding prototype determination unit is used to determine the winding prototype based on the structure and number of segments of the winding of the transformer under test.

[0028] A winding prototype specification determination unit is used to determine the specifications of the winding prototype based on predefined axial stress failure test conditions; wherein, the specifications of the winding prototype include dimensional proportions.

[0029] Furthermore, the first axial force failure test module is specifically used to conduct an axial force failure test on the winding equivalent model based on the axial force failure mode according to the axial force failure test standard of the transformer under test, and obtain the first axial force failure characteristic value; wherein, the axial force failure test standard of the transformer under test includes the standard operating parameters and standard structural parameters of the transformer under test.

[0030] Furthermore, the winding equivalent model determination module includes:

[0031] The comparison unit is used to compare the first axial force failure characteristic value and the second axial force failure characteristic value with the preset control range, respectively.

[0032] The judgment unit is used to determine that if both the first axial force failure characteristic value and the second axial force failure characteristic value are within the preset control range, the winding equivalent model shall be used as the winding axial force failure test model.

[0033] The judgment unit is further configured to determine that if the first axial force failure characteristic value or the second axial force failure characteristic value is not within the preset control range, the winding equivalent model shall not be used as the winding axial force failure test model.

[0034] Furthermore, the equivalent device for the transformer winding axial force failure test model during short circuit also includes:

[0035] The winding equivalent model adjustment module is used to adjust the winding equivalent model and establish a new winding equivalent model when it is determined that the winding equivalent model should not be used as the winding axial force failure test model.

[0036] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0037] By determining the winding prototype and its specifications based on the transformer under test, and combining these specifications, an equivalent winding model is established. Based on a predefined axial force failure mode, an axial force failure test is conducted on the equivalent winding model to obtain the first axial force failure characteristic value. Based on the axial force failure mode, an axial force failure test is conducted on the transformer under test to obtain the second axial force failure characteristic value. Based on the first and second axial force failure characteristic values, it is determined whether the equivalent winding model should be used as the winding axial force failure test model. This allows for the establishment of an equivalent winding axial force failure test model for the transformer under test, which is beneficial for accurately reflecting the winding axial force failure situation of the transformer under test and ensuring the equivalence and correctness of the study on the stability of winding axial force. Attached Figure Description

[0038] Figure 1 This is a flowchart illustrating an equivalent method for a transformer winding axial force failure test model in the first embodiment of the present invention.

[0039] Figure 2 This is a schematic diagram of the equivalent device of a transformer winding axial force failure test model according to the second embodiment of the present invention. Detailed Implementation

[0040] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0041] It should be noted that the step numbers in this document are only for the convenience of explaining the specific embodiments and are not intended to limit the order in which the steps are executed. The method provided in this embodiment can be executed by relevant terminal devices, and the following description uses a control processor as the execution subject.

[0042] like Figure 1 As shown, the first embodiment provides an equivalent method for a test model of axial force failure of transformer windings during short circuit, including steps S1 to S4:

[0043] S1. Determine the winding prototype and its specifications based on the transformer to be tested, and establish an equivalent winding model based on the winding prototype and its specifications.

[0044] S2. Based on the predefined axial stress failure mode, conduct axial stress failure tests on the equivalent model of the winding to obtain the first axial stress failure characteristic value.

[0045] S3. Based on the axial stress failure mode, an axial stress failure test is performed on the transformer under test to obtain the second axial stress failure characteristic value.

[0046] S4. Based on the first axial force failure characteristic value and the second axial force failure characteristic value, determine whether to use the winding equivalent model as the winding axial force failure test model.

[0047] As an example, in step S1, when establishing an equivalent winding axial force failure test model for the transformer under test, considering the cumulative superposition of axial forces, the specifications of the winding prototype and the winding prototype should be determined first, and the equivalent winding model should be established by combining the specifications of the winding prototype and the winding prototype.

[0048] In step S2, based on the actual research objectives of the winding axial stress stability study, axial stress failure modes are predefined. For example, when studying the axial instability mechanism, the axial stress failure mode is predefined as the middle collapse mode; when studying the axial bending mechanism, the axial stress failure mode is predefined as the end bending deformation mode. When studying multiple axial stress mechanisms such as axial instability and axial bending, the axial stress failure modes can be predefined as setting multiple axial stress failure modes such as the middle collapse mode and the end bending deformation mode at the same position of the three-phase winding, or setting multiple axial stress failure modes such as the middle collapse mode and the end bending deformation mode at different positions of the three-phase winding. Based on the predefined axial stress failure modes, an axial stress failure test is conducted on the equivalent model of the winding to obtain the first axial stress failure characteristic value.

[0049] In step S3, similarly, according to the actual research objective of the study on the axial stress stability of the winding, an axial stress failure mode is predefined. Based on the predefined axial stress failure mode, an axial stress failure test is carried out on the transformer under test to obtain the second axial stress failure characteristic value.

[0050] In step S4, based on the first axial force failure characteristic value and the second axial force failure characteristic value, it is determined whether to use the winding equivalent model as the winding axial force failure test model. If it is determined that the winding equivalent model should be used as the winding axial force failure test model, then the winding equivalent model is used as the winding axial force failure test model, so that the winding axial force failure test model can be directly applied to simulate the winding axial force failure of the transformer under test and reflect the winding axial force failure situation of the transformer under test.

[0051] This embodiment is applicable to transformers of different voltage levels and can establish an equivalent winding axial force failure test model for the transformer under test. This is beneficial for accurately reflecting the winding axial force failure of the transformer under test and ensuring the equivalence and correctness of the study on winding axial force stability.

[0052] In a preferred embodiment, determining the winding prototype and its specifications based on the transformer under test specifically includes: determining the winding prototype based on the structure and number of segments of the winding of the transformer under test; and determining the specifications of the winding prototype based on predefined axial stress failure test conditions; wherein the specifications of the winding prototype include dimensional proportions.

[0053] As an example, the winding prototype is determined according to the structure and number of segments of the winding of the transformer to be tested. For example, for transformers with voltage levels above 220kV, a universal and representative three-winding transformer with low voltage, medium voltage and high voltage can be selected as the transformer to be tested, and the winding prototype is determined according to the structure and number of segments of the winding of the transformer to be tested.

[0054] Based on the actual research objectives of the study on the axial stress stability of the winding, the axial stress failure test conditions are predefined. Based on the predefined axial stress failure test conditions, the size ratio and other specifications of the winding prototype are determined. For example, within the allowable range of the axial stress failure test conditions, the size ratio of the winding prototype can be determined to be 1 / 8 to 1 / 4, but the height of the winding prototype should be less than 1 / 3.

[0055] After determining the winding prototype and its specifications, an equivalent winding model is established based on the winding prototype and its specifications.

[0056] In a preferred embodiment of this example, the step of determining the winding prototype and its specifications based on the transformer to be tested further includes: determining the specifications of the winding prototype based on predefined winding equivalence rules.

[0057] As an example, based on the axial force characteristics of the winding structure, winding equivalence rules are predefined, and the specifications of the winding prototype are determined based on these predefined rules. For example, the winding equivalence rules include at least one of the following:

[0058] 1. The conductors of the winding equivalent model are composite conductors, and the ampere-turn arrangement of the winding equivalent model is consistent with or close to that of the transformer under test;

[0059] 2. The ratio of the pad thickness to the copper wire thickness in the winding equivalent model is close to that of the transformer under test; preferably, the copper wire thickness ranges from 1.4 to 2.42 mm.

[0060] 3. The pad coverage ratio of the winding equivalent model is close to that of the transformer under test;

[0061] 4. The mechanical and magnetic field boundaries of the winding equivalent model are similar to those of the transformer under test;

[0062] 5. The insulation material of the winding equivalent model is a conventionally used material.

[0063] After determining the winding prototype and its specifications, an equivalent winding model is established based on the winding prototype and its specifications.

[0064] This embodiment can establish a winding equivalent model based on predefined axial stress failure test conditions and winding equivalence rules, which is beneficial for better establishing a winding axial stress failure test model for the transformer under test.

[0065] In a preferred embodiment, the step of conducting an axial force failure test on the winding equivalent model based on a predefined axial force failure mode to obtain a first axial force failure characteristic value specifically includes: conducting an axial force failure test on the winding equivalent model based on the axial force failure mode according to the axial force failure test standard of the transformer under test to obtain a first axial force failure characteristic value; wherein, the axial force failure test standard of the transformer under test includes the standard operating parameters and standard structural parameters of the transformer under test.

[0066] As an example, when conducting axial stress failure tests on the equivalent winding model, the aforementioned axial stress failure test conditions and winding equivalence rules should be considered. First, determine the standard operating parameters of the transformer under test, such as capacity, voltage, and short-circuit current. Next, determine the standard structural parameters of the transformer under test, such as the preload unit force. Since the clamping system of the equivalent winding model is similar to that of the transformer under test, the preload unit force of the equivalent winding model is close to that of the transformer under test. The preload unit force of the equivalent winding model can be determined based on the preload unit force of the transformer under test. Finally, organize the standard operating parameters and standard structural parameters of the transformer under test to obtain the axial stress failure test standard for the transformer under test.

[0067] After obtaining the axial force failure test standard for the transformer under test, an axial force failure test is conducted on the winding equivalent model based on the axial force failure mode, in accordance with the axial force failure test standard for the transformer under test, to obtain the first axial force failure characteristic value.

[0068] Understandably, without affecting the winding leakage flux distribution and overall stress, local modifications can be made to better simulate the axial stress failure of the transformer under test.

[0069] Similarly, in accordance with the axial stress failure test standard for the transformer under test, based on the predefined axial stress failure mode, the transformer under test is subjected to an axial stress failure test to obtain the second axial stress failure characteristic value.

[0070] This embodiment conducts axial force failure tests on the winding equivalent model and the transformer under test in accordance with the axial force failure test standard of the transformer under test. This ensures that the first and second axial force failure characteristic values ​​can be used as the data basis for subsequent effective judgment on whether to use the winding equivalent model as the winding axial force failure test model. This is beneficial for better establishing the winding axial force failure test model for the transformer under test.

[0071] In a preferred embodiment, the step of determining whether to use the winding equivalent model as the winding axial force failure test model based on the first axial force failure characteristic value and the second axial force failure characteristic value specifically involves: comparing the first axial force failure characteristic value and the second axial force failure characteristic value with a preset control range; if both the first axial force failure characteristic value and the second axial force failure characteristic value are within the preset control range, then it is determined that the winding equivalent model will be used as the winding axial force failure test model; if either the first axial force failure characteristic value or the second axial force failure characteristic value is not within the preset control range, then it is determined that the winding equivalent model will not be used as the winding axial force failure test model.

[0072] In a preferred embodiment, the equivalent method for the transformer winding axial force failure test model during a short circuit further includes the following steps:

[0073] S4. When it is determined that the winding equivalent model should not be used as the winding axial force failure test model, the winding equivalent model should be adjusted and a new winding equivalent model should be established.

[0074] As an example, after obtaining the first axial force failure characteristic value and the second axial force failure characteristic value, the first axial force failure characteristic value is compared with the preset control range, and the second axial force failure characteristic value is compared with the preset control range. If both the first axial force failure characteristic value and the second axial force failure characteristic value are within the preset control range, the equivalence and correctness of the winding equivalent model established this time are considered to meet the requirements, and the winding equivalent model established this time is determined to be used as the winding axial force failure test model. If the first axial force failure characteristic value or the second axial force failure characteristic value is not within the preset control range, the equivalence and correctness of the winding equivalent model established this time are considered to not meet the requirements, and the winding equivalent model is determined not to be used as the winding axial force failure test model. The winding equivalent model should be adjusted, and a new winding equivalent model should be established so that the corresponding operations are repeated according to steps S1 to S4 until the winding axial force failure test model is obtained.

[0075] For example, the comparison results of the first axial force failure characteristic value and the second axial force failure characteristic value with the preset control range are shown in Table 1:

[0076] Table 1

[0077]

[0078]

[0079] As shown in Table 1, the first axial force failure characteristic value includes the values ​​of multiple characteristic quantities. Only when the values ​​of all characteristic quantities are within the corresponding preset control range will the first axial force failure characteristic value be within the preset control range. Similarly, the second axial force failure characteristic value includes the values ​​of multiple characteristic quantities. Only when the values ​​of all characteristic quantities are within the corresponding preset control range will the second axial force failure characteristic value be within the preset control range.

[0080] This embodiment determines whether to use the winding equivalent model as the winding axial force failure test model by comparing the first axial force failure characteristic value and the second axial force failure characteristic value with the preset control range. This can fully consider the multidimensional characteristic quantities of the winding axial force failure test, which is conducive to better establishing the winding axial force failure test model for the transformer under test.

[0081] Based on the same inventive concept as the first embodiment, the second embodiment provides as follows: Figure 2 The device shown is an equivalent device for a transformer winding axial force failure test model during short circuit, comprising: a winding equivalent model establishment module 21, used to establish a winding equivalent model based on the winding prototype and specifications of the transformer under test; a first axial force failure test module 22, used to conduct an axial force failure test on the winding equivalent model based on a predefined axial force failure mode to obtain a first axial force failure characteristic value; a second axial force failure test module 23, used to conduct an axial force failure test on the transformer under test based on the axial force failure mode to obtain a second axial force failure characteristic value; and a winding equivalent model judgment module 24, used to determine whether to use the winding equivalent model as the winding axial force failure test model based on the first and second axial force failure characteristic values.

[0082] In a preferred embodiment, the winding equivalent model establishment module 21 includes: a winding prototype determination unit, used to determine the winding prototype according to the structure and number of segments of the winding of the transformer to be tested; and a winding prototype specification determination unit, used to determine the specifications of the winding prototype based on predefined axial force failure test conditions; wherein the specifications of the winding prototype include dimensional proportions.

[0083] In a preferred embodiment, the first axial force failure test module 22 is specifically used to perform an axial force failure test on the winding equivalent model based on the axial force failure mode according to the axial force failure test standard of the transformer under test, and obtain the first axial force failure characteristic value; wherein, the axial force failure test standard of the transformer under test includes the standard operating parameters and standard structural parameters of the transformer under test.

[0084] In a preferred embodiment, the winding equivalent model determination module 24 includes: a comparison unit, used to compare the first axial force failure characteristic value and the second axial force failure characteristic value with a preset control range; a determination unit, used to determine that the winding equivalent model is used as the winding axial force failure test model if both the first axial force failure characteristic value and the second axial force failure characteristic value are within the preset control range; and a determination unit, also used to determine that the winding equivalent model is not used as the winding axial force failure test model if either the first axial force failure characteristic value or the second axial force failure characteristic value is not within the preset control range.

[0085] In a preferred embodiment, the equivalent device for the axial force failure test model of the transformer winding during a short circuit further includes: a winding equivalent model adjustment module, used to adjust the winding equivalent model and establish a new winding equivalent model when it is determined that the winding equivalent model should not be used as the winding axial force failure test model.

[0086] In summary, implementing the embodiments of the present invention has the following beneficial effects:

[0087] By determining the winding prototype and its specifications based on the transformer under test, and combining these specifications, an equivalent winding model is established. Based on a predefined axial force failure mode, an axial force failure test is conducted on the equivalent winding model to obtain the first axial force failure characteristic value. Based on the axial force failure mode, an axial force failure test is conducted on the transformer under test to obtain the second axial force failure characteristic value. Based on the first and second axial force failure characteristic values, it is determined whether the equivalent winding model should be used as the winding axial force failure test model. This allows for the establishment of an equivalent winding axial force failure test model for the transformer under test, which is beneficial for accurately reflecting the winding axial force failure situation of the transformer under test and ensuring the equivalence and correctness of the study on the stability of winding axial force.

[0088] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

[0089] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes described in the above embodiments. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc.

Claims

1. An equivalent method for a test model of axial force failure of transformer windings during short circuit, characterized in that, include: Based on the transformer to be tested, determine the winding prototype and its specifications, and then establish an equivalent winding model by combining the winding prototype and its specifications. Based on a predefined axial stress failure mode, an axial stress failure test is performed on the equivalent model of the winding to obtain the first axial stress failure characteristic value. Based on the axial stress failure mode, an axial stress failure test was conducted on the transformer under test to obtain the second axial stress failure characteristic value. Based on the first axial force failure characteristic value and the second axial force failure characteristic value, determine whether to use the winding equivalent model as the winding axial force failure test model; Specifically, determining whether to use the winding equivalent model as the winding axial force failure test model based on the first axial force failure characteristic value and the second axial force failure characteristic value involves: The first axial force failure characteristic value and the second axial force failure characteristic value are compared with the preset control range respectively; If both the first axial force failure characteristic value and the second axial force failure characteristic value are within the preset control range, then the winding equivalent model is determined to be the winding axial force failure test model. If the first axial force failure characteristic value or the second axial force failure characteristic value is not within the preset control range, then it is determined that the winding equivalent model will not be used as the winding axial force failure test model.

2. The equivalent method for the transformer winding axial force failure test model under short circuit as described in claim 1, characterized in that, The process of determining the winding prototype and its specifications based on the transformer under test specifically includes: The prototype of the winding is determined based on the structure and number of segments of the winding of the transformer to be tested; The specifications of the winding prototype are determined based on predefined axial stress failure test conditions; wherein, the specifications of the winding prototype include dimensional proportions.

3. The equivalent method for the transformer winding axial force failure test model under short circuit as described in claim 1, characterized in that, Based on a predefined axial stress failure mode, an axial stress failure test is performed on the equivalent model of the winding to obtain the first axial stress failure characteristic value, specifically including: According to the axial force failure test standard of the transformer under test, based on the axial force failure mode, the winding equivalent model is subjected to axial force failure test to obtain the first axial force failure characteristic value; wherein, the axial force failure test standard of the transformer under test includes the standard operating parameters and standard structural parameters of the transformer under test.

4. The equivalent method for the transformer winding axial force failure test model under short circuit as described in claim 1, characterized in that, Also includes: When it is determined that the winding equivalent model should not be used as the winding axial force failure test model, the winding equivalent model is adjusted and a new winding equivalent model is established.

5. An equivalent device for a test model of axial force failure of transformer windings during short circuit, characterized in that, include: The winding equivalent model establishment module is used to determine the winding prototype and its specifications based on the transformer under test, and to establish a winding equivalent model in combination with the winding prototype and its specifications. The first axial stress failure test module is used to perform axial stress failure tests on the winding equivalent model based on a predefined axial stress failure mode to obtain the first axial stress failure characteristic value. The second axial force failure test module is used to conduct an axial force failure test on the transformer under test based on the axial force failure mode, and obtain the second axial force failure characteristic value. The winding equivalent model judgment module is used to determine whether to use the winding equivalent model as the winding axial force failure test model based on the first axial force failure characteristic value and the second axial force failure characteristic value. The winding equivalent model determination module includes: The comparison unit is used to compare the first axial force failure characteristic value and the second axial force failure characteristic value with the preset control range, respectively. The judgment unit is used to determine that if both the first axial force failure characteristic value and the second axial force failure characteristic value are within the preset control range, the winding equivalent model shall be used as the winding axial force failure test model. The judgment unit is further configured to determine that if the first axial force failure characteristic value or the second axial force failure characteristic value is not within the preset control range, the winding equivalent model shall not be used as the winding axial force failure test model.

6. The equivalent device for the transformer winding axial force failure test model as described in claim 5, characterized in that, The winding equivalent model establishment module includes: The winding prototype determination unit is used to determine the winding prototype based on the structure and number of segments of the winding of the transformer under test. A winding prototype specification determination unit is used to determine the specifications of the winding prototype based on predefined axial stress failure test conditions; wherein, the specifications of the winding prototype include dimensional proportions.

7. The equivalent device for the transformer winding axial force failure test model as described in claim 5, characterized in that, The first axial force failure test module is specifically used to conduct an axial force failure test on the winding equivalent model according to the axial force failure test standard of the transformer under test and based on the axial force failure mode, to obtain the first axial force failure characteristic value; wherein, the axial force failure test standard of the transformer under test includes the standard operating parameters and standard structural parameters of the transformer under test.

8. The equivalent device for the transformer winding axial force failure test model as described in claim 5, characterized in that, Also includes: The winding equivalent model adjustment module is used to adjust the winding equivalent model and establish a new winding equivalent model when it is determined that the winding equivalent model should not be used as the winding axial force failure test model.

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