Equivalent method and device for transformer winding amplitude stress failure test model during short circuit

Abstract

The application discloses a transformer short-circuit winding amplitude force 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 amplitude force failure test on the winding equivalent model based on a pre-defined amplitude force failure mode, obtains a first amplitude force failure characteristic value, carries out an amplitude force failure test on the transformer to be tested based on the amplitude force failure mode, obtains a second amplitude force failure characteristic value, and judges whether the winding equivalent model is used as a winding amplitude force failure test model according to the first amplitude force failure characteristic value and the second amplitude force failure characteristic value. The winding amplitude force failure test model can be established for the transformer to be tested, which is beneficial to accurately reflecting the winding amplitude force failure condition of the transformer to be tested and guaranteeing the equivalence and correctness of the winding amplitude force stability research.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transformer short-circuit resistance test, and in particular to a transformer winding amplitude stress failure test model equivalent method and device. BACKGROUND

[0002] When the transformer is short-circuited, the winding is mainly subjected to the amplitude stress from the two ends of the winding to the middle part and the radial stress which has a compression effect on the inner winding and an expansion effect on the outer winding. The winding amplitude stress stability is a key factor affecting the transformer short-circuit resistance, and the damage is mainly distributed in the inner winding, and the failure mode is manifested as winding deformation.

[0003] At present, in order to study the winding amplitude stress stability of the 220kV transformer, considering that the winding deformation cannot be directly measured and compared, the winding amplitude stress failure test of the transformer when short-circuited is mainly carried out by theoretical calculation or simulation test, the winding deformation is indirectly reflected to reflect the winding amplitude stress of the transformer to be tested, and the depth and accuracy of the test research need to be improved. The winding amplitude stress failure test of the 220kV transformer must be completed in a specific high-voltage strong-current test center, and all test researches cannot be completed by using a 1:1 model, so it is difficult to accurately reflect the winding amplitude stress failure of the transformer to be tested, and the equivalence and correctness of the winding amplitude stress stability research cannot be guaranteed. SUMMARY

[0004] In order to overcome the defects of the prior art, the present application provides a transformer winding amplitude stress failure test model equivalent method and device, which can establish a winding amplitude stress failure test model equivalent to the transformer to be tested, and is beneficial to accurately reflect the winding amplitude stress failure of the transformer to be tested, and guarantee the equivalence and correctness of the winding amplitude stress stability research.

[0005] In order to solve the above technical problems, in a first aspect, an embodiment of the present application provides a transformer winding amplitude stress failure test model equivalent method, comprising:

[0006] determining a winding prototype and a specification of the winding prototype according to a transformer to be tested, and establishing a winding equivalent model in combination with the winding prototype and the specification of the winding prototype;

[0007] performing an amplitude stress failure test on the winding equivalent model based on a pre-defined amplitude stress failure mode, and obtaining a first amplitude stress failure characteristic value;

[0008] performing an amplitude stress failure test on the transformer to be tested based on the amplitude stress failure mode, and obtaining a second amplitude stress failure characteristic value;

[0009] determine whether to take the winding equivalent model as a winding amplitude stress failure test model according to the first amplitude stress failure characteristic value and the second amplitude stress failure characteristic value.

[0010] Further, the winding prototype is determined according to the transformer to be tested, and the specification of the winding prototype specifically comprises:

[0011] The winding prototype is determined according to the structure of the winding of the transformer to be tested.

[0012] The specification of the winding prototype is determined based on a predefined amplitude stress failure test condition, wherein the specification of the winding prototype comprises a size ratio.

[0013] Further, the winding equivalent model is subjected to an amplitude stress failure test based on the predefined amplitude stress failure mode to obtain a first amplitude stress failure characteristic value, specifically comprising:

[0014] The winding equivalent model is subjected to an amplitude stress failure test based on the amplitude stress failure mode according to an amplitude stress failure test standard of the transformer to be tested to obtain the first amplitude stress failure characteristic value, wherein the amplitude stress failure test standard of the transformer to be tested comprises standard operating parameters and standard structure parameters of the transformer to be tested.

[0015] Further, the winding equivalent model is determined whether to take the winding equivalent model as a winding amplitude stress failure test model according to the first amplitude stress failure characteristic value and the second amplitude stress failure characteristic value, specifically comprising:

[0016] For each characteristic quantity, the first value of the characteristic quantity and the second value of the characteristic quantity are compared with a preset control range of the characteristic quantity, respectively, wherein the first amplitude stress failure characteristic value comprises a plurality of first values of the characteristic quantity, and the second amplitude stress failure characteristic value comprises a plurality of second values of the characteristic quantity.

[0017] If the first value of each characteristic quantity and the second value of each characteristic quantity are both within the preset control range of each characteristic quantity, it is determined that the winding equivalent model is taken as the winding amplitude stress failure test model.

[0018] If the first value of any characteristic quantity or the second value of any characteristic quantity is outside the preset control range of any characteristic quantity, it is determined that the winding equivalent model is not taken as the winding amplitude stress failure test model.

[0019] Further, for each characteristic quantity, the first value of the characteristic quantity and the second value of the characteristic quantity are compared with the preset control range of the characteristic quantity, specifically comprising:

[0020] According to the weight order of the respective feature quantities, one of the feature quantities is selected in turn, and the first value of the feature quantity and the second value of the feature quantity are compared with the preset control range of the feature quantity, respectively.

[0021] Further, the transformer short-circuit winding amplitude direction stress failure test model equivalent method further comprises:

[0022] When it is determined that the winding equivalent model is not used as the winding amplitude direction stress failure test model, the winding equivalent model is adjusted to establish a new winding equivalent model.

[0023] In a second aspect, an embodiment of the present application provides a transformer short-circuit winding amplitude direction stress failure test model equivalent device, comprising:

[0024] The winding equivalent model establishing module is configured to determine a winding prototype and a specification of the winding prototype according to the transformer to be tested, and establish a winding equivalent model in combination with the winding prototype and the specification of the winding prototype.

[0025] The first amplitude direction stress failure test module is configured to perform an amplitude direction stress failure test on the winding equivalent model based on a predefined amplitude direction stress failure mode, and obtain a first amplitude direction stress failure characteristic value.

[0026] The second amplitude direction stress failure test module is configured to perform an amplitude direction stress failure test on the transformer to be tested based on the amplitude direction stress failure mode, and obtain a second amplitude direction stress failure characteristic value.

[0027] The winding equivalent model judging module is configured to determine whether to use the winding equivalent model as a winding amplitude direction stress failure test model according to the first amplitude direction stress failure characteristic value and the second amplitude direction stress failure characteristic value.

[0028] Further, the winding equivalent model establishing module comprises:

[0029] The winding prototype determining unit is configured to determine the winding prototype according to the structure of the winding of the transformer to be tested.

[0030] The winding prototype specification determining unit is configured to determine the specification of the winding prototype based on a predefined amplitude direction stress failure test condition, wherein the specification of the winding prototype comprises a size ratio.

[0031] Further, the first amplitude stress failure test module is specifically used for performing amplitude stress failure test on the winding equivalent model based on the amplitude stress failure mode according to the amplitude stress failure test standard of the transformer to be tested, so as to obtain the first amplitude stress failure characteristic value; wherein the amplitude stress failure test standard of the transformer to be tested comprises standard operating parameters and standard structure parameters of the transformer to be tested.

[0032] Further, the winding equivalent model judgment module comprises:

[0033] The comparison unit is configured to compare the first value of each characteristic quantity and the second value of each characteristic quantity with a preset control range of the characteristic quantity respectively; wherein the first amplitude stress failure characteristic value comprises first values of a plurality of characteristic quantities, and the second amplitude stress failure characteristic value comprises second values of the plurality of characteristic quantities.

[0034] The judgment unit is configured to determine that the winding equivalent model is used as the winding amplitude stress failure test model if the first value of each characteristic quantity and the second value of each characteristic quantity are both within the preset control range of each characteristic quantity.

[0035] The judgment unit is further configured to determine that the winding equivalent model is not used as the winding amplitude stress failure test model if the first value of any characteristic quantity or the second value of any characteristic quantity is outside the preset control range of the characteristic quantity.

[0036] Compared with the prior art, the embodiment of the present application has the following beneficial effects:

[0037] By determining the winding prototype and the specification of the winding prototype according to the transformer to be tested, establishing the winding equivalent model in combination with the winding prototype and the specification of the winding prototype, performing amplitude stress failure test on the winding equivalent model based on the pre-defined amplitude stress failure mode to obtain the first amplitude stress failure characteristic value, performing amplitude stress failure test on the transformer to be tested based on the amplitude stress failure mode to obtain the second amplitude stress failure characteristic value, and determining whether to use the winding equivalent model as the winding amplitude stress failure test model according to the first amplitude stress failure characteristic value and the second amplitude stress failure characteristic value, the winding amplitude stress failure test model can be established for the transformer to be tested, which is beneficial to accurately reflecting the winding amplitude stress failure of the transformer to be tested and guaranteeing the equivalence and correctness of the winding amplitude stress failure stability research. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 It is a flowchart of a transformer short-circuit winding amplitude stress failure test model equivalence method in the first embodiment of the present application.

[0039] Figure 2 Figure 1 is a structural schematic diagram of a transformer short-circuit winding amplitude force failure test model equivalent device according to a second embodiment of the present application. DETAILED DESCRIPTION

[0040] The technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0041] It should be noted that the step numbers in the text are only for the convenience of explaining the specific embodiments, and do not serve as the function of limiting the execution sequence of the steps. The method provided in the present embodiment can be executed by the related terminal device, and the processor is taken as an example for description hereinafter.

[0042] As shown in Figure 1 The first embodiment provides a transformer short-circuit winding amplitude force failure test model equivalent method, which comprises steps S1-S4:

[0043] S1, determining a winding prototype and a specification of the winding prototype according to a transformer to be tested, and establishing a winding equivalent model in combination with the winding prototype and the specification of the winding prototype;

[0044] S2, performing an amplitude force failure test on the winding equivalent model based on a predefined amplitude force failure mode, to obtain a first amplitude force failure characteristic value;

[0045] S3, performing an amplitude force failure test on the transformer to be tested based on the amplitude force failure mode, to obtain a second amplitude force failure characteristic value;

[0046] S4, judging whether to take the winding equivalent model as a winding amplitude force failure test model according to the first amplitude force failure characteristic value and the second amplitude force failure characteristic value.

[0047] As an example, in step S1, in the process of establishing a winding amplitude force failure test model for the transformer to be tested, the cumulative superposition problem of the amplitude force should be considered, and the winding prototype and the specification of the winding prototype should be determined first. The determined winding prototype should have appeared the amplitude force stability problem in engineering, and its failure form and failure phenomenon are consistent with the theoretical analysis. In combination with the winding prototype and the specification of the winding prototype, the winding equivalent model is established.

[0048] In step S2, according to the actual research target of the winding axial force stability research, the axial force failure mode is defined in advance, such as defining the axial force failure mode as the forced warping mode when researching the axial instability mechanism or guiding the new transformer design, the forced warping mode can be simulated by using the mode of multiple support points and strong support, defining the axial force failure mode as the free warping mode when researching the characteristics and performance improvement of the old transformer winding, the free warping mode can be simulated by using the mode of few support points and weak support, when researching the axial instability mechanism and other axial force mechanisms, the axial force failure mode can be defined as multiple axial force failure modes such as forced warping mode, free warping mode and the like at the same position of the three-phase winding, or multiple axial force failure modes such as forced warping mode, free warping mode and the like at different positions of the three-phase winding. Based on the pre-defined axial force failure mode, the axial force failure test of the winding equivalent model is carried out to obtain the first axial force failure characteristic value.

[0049] In step S3, similarly, according to the actual research target of the winding axial force stability research, the axial force failure mode is defined in advance, based on the pre-defined axial force failure mode, the axial force failure test of the to-be-tested transformer is carried out to obtain the second axial force failure characteristic value.

[0050] In step S4, according to the first axial force failure characteristic value and the second axial force failure characteristic value, it is judged whether the winding equivalent model is used as the winding axial force failure test model, if it is determined that the winding equivalent model is used as the winding axial force failure test model, 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 to-be-tested transformer in the subsequent process, and the winding axial force failure of the to-be-tested transformer can be reflected.

[0051] The embodiment is suitable for transformers of different voltage grades, and can establish the winding axial force failure test model for the equivalent of the to-be-tested transformer, which is beneficial to accurately reflecting the winding axial force failure of the to-be-tested transformer and ensuring the equivalence and correctness of the winding axial force stability research.

[0052] In the preferred embodiment, the winding prototype and the specification of the winding prototype are determined according to the to-be-tested transformer, specifically including: determining the winding prototype according to the structure of the winding of the to-be-tested transformer; determining the specification of the winding prototype based on the pre-defined axial force failure test condition; wherein the specification of the winding prototype includes the size ratio.

[0053] As an example, according to the structure of the winding of the transformer to be tested, the winding prototype is determined, such as for the transformer with a voltage grade of 110 kV or above, a double-winding transformer or a three-winding transformer with universality and representativeness can be selected as the transformer to be tested, and the winding prototype is determined according to the structure of the winding of the transformer to be tested.

[0054] According to the actual research target of the winding amplitude force stability research, the amplitude force failure test condition is defined in advance, and the size ratio of the winding prototype is determined based on the pre-defined amplitude force failure test condition, such as the size ratio of the winding prototype can be determined as 1 / 8-1 / 4 within the allowable range of the amplitude force failure test condition.

[0055] After the winding prototype and the size of the winding prototype are determined, the winding equivalent model is established in combination with the winding prototype and the size of the winding prototype.

[0056] In a preferred embodiment of the present embodiment, the winding prototype and the size of the winding prototype are determined according to the transformer to be tested, and specifically, the size of the winding prototype is determined based on the pre-defined winding equivalent rule.

[0057] As an example, the winding equivalent rule is defined in advance according to the amplitude force characteristics of the winding structure, and the size of the winding prototype is determined based on the pre-defined winding equivalent rule. For example, the winding equivalent rule includes at least one of the following:

[0058] 1. The winding equivalent model uses a combination of conductors, and the ampere-turn arrangement of the winding equivalent model is consistent or close to that of the transformer to be tested;

[0059] 2. The ratio of the thickness of the copper conductor to the thickness of the pad of the winding equivalent model is close to that of the transformer to be tested; preferably, the thickness of the copper conductor is 1.4-2.42 mm;

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

[0061] 4. The mechanical boundary and magnetic field boundary of the winding equivalent model have similarity with those of the transformer to be tested;

[0062] 5. The insulating material of the winding equivalent model is a commonly used material.

[0063] After the winding prototype and the size of the winding prototype are determined, the winding equivalent model is established in combination with the winding prototype and the size of the winding prototype.

[0064] The present embodiment can establish a winding equivalent model based on the pre-defined amplitude force failure test condition and the winding equivalent rule, which is beneficial to better establish a winding amplitude force failure test model for the transformer to be tested.

[0065] In the preferred embodiment, the first amplitude stress failure characteristic value is obtained by performing an amplitude stress failure test on the winding equivalent model based on the predefined amplitude stress failure mode, specifically comprising: performing an amplitude stress failure test on the winding equivalent model based on the amplitude stress failure mode according to the amplitude stress failure test standard of the transformer to be tested, to obtain the first amplitude stress failure characteristic value; wherein the amplitude stress failure test standard of the transformer to be tested comprises standard operating parameters and standard structural parameters of the transformer to be tested.

[0066] For example, when performing the amplitude stress failure test on the winding equivalent model, the above-mentioned amplitude stress failure test conditions and winding equivalent rules should be considered. First, the standard operating parameters such as capacity, voltage and short-circuit current of the transformer to be tested are determined, then the standard structural parameters such as the unit action force of the pre-pressure of the transformer to be tested are determined. Since the boundary structure such as the compression system and the tension structure of the winding equivalent model is similar to that of the transformer to be tested, the unit action force of the pre-pressure of the winding equivalent model is close to that of the transformer to be tested, and the unit action force of the pre-pressure of the winding equivalent model can be determined according to the unit action force of the pre-pressure of the transformer to be tested. Finally, the standard operating parameters and standard structural parameters of the transformer to be tested are sorted out to obtain the amplitude stress failure test standard of the transformer to be tested.

[0067] After obtaining the amplitude stress failure test standard of the transformer to be tested, the winding equivalent model is tested based on the amplitude stress failure mode according to the amplitude stress failure test standard of the transformer to be tested, to obtain the first amplitude stress failure characteristic value.

[0068] It can be understood that, without affecting the winding leakage magnetic field distribution and overall stress, local changes can be made to better simulate the winding amplitude stress failure of the transformer to be tested.

[0069] Similarly, the second amplitude stress failure characteristic value is obtained by performing an amplitude stress failure test on the transformer to be tested based on the predefined amplitude stress failure mode according to the amplitude stress failure test standard of the transformer to be tested.

[0070] The embodiment can ensure that the first amplitude stress failure characteristic value and the second amplitude stress failure characteristic value can be used as data basis for subsequent effective judgment of whether to use the winding equivalent model as a winding amplitude stress failure test model, which is conducive to better establishing a winding amplitude stress failure test model for the equivalent of the transformer to be tested.

[0071] In the preferred embodiments, the judging whether to take the winding equivalent model as the winding amplitude stress failure test model according to the first amplitude stress failure characteristic value and the second amplitude stress failure characteristic value specifically comprises: for each characteristic value, comparing the first value of the characteristic value and the second value of the characteristic value with a preset control range of the characteristic value respectively; wherein the first amplitude stress failure characteristic value comprises first values of a plurality of characteristic values, and the second amplitude stress failure characteristic value comprises second values of a plurality of characteristic values; if the first values of the characteristic values and the second values of the characteristic values are all within the preset control range of the characteristic values, it is determined that the winding equivalent model is taken as the winding amplitude stress failure test model; if the first value of any characteristic value or the second value of any characteristic value is out of the preset control range of any characteristic value, it is determined that the winding equivalent model is not taken as the winding amplitude stress failure test model.

[0072] In the preferred embodiments, the transformer short-circuit winding amplitude stress failure test model equivalent method further comprises step S5:

[0073] S5, when it is determined that the winding equivalent model is not taken as the winding amplitude stress failure test model, adjusting the winding equivalent model to establish a new winding equivalent model.

[0074] For example, after obtaining the first amplitude stress failure characteristic value and the second amplitude stress failure characteristic value, because the first amplitude stress failure characteristic value comprises first values of a plurality of characteristic values, and the second amplitude stress failure characteristic value comprises second values of a plurality of characteristic values, for each characteristic value, the first value of the characteristic value is compared with the preset control range of the characteristic value, and the second value of the characteristic value is compared with the preset control range of the characteristic value, to obtain the comparison result of the first value of the characteristic value with the preset control range of the characteristic value, and the comparison result of the second value of the characteristic value with the preset control range of the characteristic value, thereby obtaining the comparison result of the first value of each characteristic value with the preset control range of each characteristic value, and the comparison result of the second value of each characteristic value with the preset control range of each characteristic value; if the first values of the characteristic values and the second values of the characteristic values are all within the preset control range of the characteristic values, it is considered that the equivalence and correctness of the winding equivalent model established this time meet the requirements, and it is determined that the winding equivalent model established this time is taken as the winding amplitude stress failure test model; if the first value of any characteristic value or the second value of any characteristic value is out of the preset control range of any characteristic value, it is considered that the equivalence and correctness of the winding equivalent model established this time do not meet the requirements, and it is determined that the winding equivalent model established this time is not taken as the winding amplitude stress failure test model, and the winding equivalent model should be adjusted to establish a new winding equivalent model, so as to perform corresponding operations according to steps S1-S4 again until the winding amplitude stress failure test model is obtained.

[0075] For example, all the characteristic quantities can be divided into a plurality of direct characteristic quantities and a plurality of indirect characteristic quantities, the comparison results of the first values of each direct characteristic quantity and the preset control range corresponding to each direct characteristic quantity, and the comparison results of the second values of each direct characteristic quantity and the preset control range corresponding to each direct characteristic quantity are shown in Table 1, and the comparison results of the first values of each indirect characteristic quantity and the preset control range corresponding to each indirect characteristic quantity, and the comparison results of the second values of each indirect characteristic quantity and the preset control range corresponding to each indirect characteristic quantity are shown in Table 2.

[0076] Table 1

[0077]

[0078] Table 2

[0079]

[0080] In Table 2, the calculation formula of the radial deformation ratio is:

[0081] δ = Δx / R0 x 100% (1);

[0082] In formula (1), Δx is the maximum deformation along the width direction, and R0 is the average radius of the winding.

[0083] As can be seen from Tables 1 and 2, the first width direction stress failure characteristic value includes the first values of a plurality of characteristic quantities, the second width direction stress failure characteristic value includes the second values of a plurality of characteristic quantities, and the first value of each characteristic quantity and the second value of each characteristic quantity are both within the preset control range of each characteristic quantity. At this time, it is considered that the equivalence and correctness of the winding equivalent model established this time meet the requirements, and it is determined that the winding equivalent model established this time is used as the winding width direction stress failure test model.

[0084] The embodiment can fully consider the multi-dimensional characteristic quantities of the winding width direction stress failure test by judging whether to use the winding equivalent model as the winding width direction stress failure test model according to the comparison results of the first width direction stress failure characteristic value and the second width direction stress failure characteristic value and the preset control range, which is beneficial to better establish the winding width direction stress failure test model for the equivalent transformer to be tested.

[0085] In the preferred embodiment, for each characteristic quantity, the first value of the characteristic quantity and the second value of the characteristic quantity are compared with the preset control range of the characteristic quantity, specifically: according to the weight order of each characteristic quantity, a characteristic quantity is selected in turn, and the first value of the characteristic quantity and the second value of the characteristic quantity are compared with the preset control range of the characteristic quantity.

[0086] As an example, the degree of influence of each feature quantity on the winding width direction stress stability is combined, different weights are set for each feature quantity, each feature quantity is sorted according to the order from high to low weight, one feature quantity is selected in sequence, and the first value of the feature quantity and the second value of the feature quantity are compared with the preset control range of the feature quantity respectively, so as to divide each feature quantity for layer-by-layer research.

[0087] According to the weight order of each feature quantity, one feature quantity is selected in sequence, and the first value of the feature quantity and the second value of the feature quantity are compared with the preset control range of the feature quantity respectively, so as to realize the layer-by-layer research of the winding width direction stress stability.

[0088] Based on the same inventive concept as the first embodiment, the second embodiment provides a transformer short-circuit winding width direction stress failure test model equivalent device as shown in Figure 2 The transformer short-circuit winding width direction stress failure test model equivalent device comprises: a winding equivalent model establishing module 21, configured to determine a winding prototype and a specification of the winding prototype according to a to-be-tested transformer, and establish a winding equivalent model in combination with the winding prototype and the specification of the winding prototype; a first width direction stress failure test module 22, configured to perform a width direction stress failure test on the winding equivalent model based on a predefined width direction stress failure mode, and obtain a first width direction stress failure characteristic value; a second width direction stress failure test module 23, configured to perform a width direction stress failure test on the to-be-tested transformer based on the width direction stress failure mode, and obtain a second width direction stress failure characteristic value; and a winding equivalent model judgment module 24, configured to judge whether to take the winding equivalent model as a winding width direction stress failure test model according to the first width direction stress failure characteristic value and the second width direction stress failure characteristic value.

[0089] In the preferred embodiment, the winding equivalent model establishing module 21 comprises: a winding prototype determining unit, configured to determine a winding prototype according to the structure of the winding of the to-be-tested transformer; and a winding prototype specification determining unit, configured to determine the specification of the winding prototype based on a predefined width direction stress failure test condition; wherein the specification of the winding prototype comprises a size ratio.

[0090] In the preferred embodiment, the first width direction stress failure test module 22 is specifically configured to perform a width direction stress failure test on the winding equivalent model based on the width direction stress failure mode according to the width direction stress failure test standard of the to-be-tested transformer, and obtain the first width direction stress failure characteristic value; wherein the width direction stress failure test standard of the to-be-tested transformer comprises standard operating parameters and standard structure parameters of the to-be-tested transformer.

[0091] In a preferred embodiment, the winding equivalent model determination module 24 includes: a comparison unit, used to compare the first value and the second value of each feature quantity with a preset control range of the feature quantity; wherein the first radial stress failure feature value includes the first values ​​of several feature quantities, and the second radial stress failure feature value includes the second values ​​of several feature quantities; a determination unit, used to determine that the winding equivalent model is used as the winding radial stress failure test model if the first value and the second value of each feature quantity are both within the preset control range of each feature quantity; the determination unit is also used to determine that the winding equivalent model is not used as the winding radial stress failure test model if the first value or the second value of any feature quantity is outside the preset control range of any feature quantity.

[0092] In a preferred embodiment, the comparison unit is specifically used to sort each feature quantity according to its weight, select one feature quantity in sequence, and compare the first value and the second value of the feature quantity with the preset control range of the feature quantity.

[0093] In a preferred embodiment, the equivalent device for the test model of the winding radial stress failure during transformer 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 test model for winding radial stress failure.

[0094] In summary, implementing the embodiments of the present invention has the following beneficial effects:

[0095] 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 radial stress failure mode, a radial stress failure test is conducted on the equivalent winding model to obtain the first radial stress failure characteristic value. Based on the radial stress failure mode, a radial stress failure test is conducted on the transformer under test to obtain the second radial stress failure characteristic value. Based on the first and second radial stress failure characteristic values, it is determined whether the equivalent winding model should be used as the radial stress failure test model. This allows for the establishment of an equivalent radial stress failure test model for the transformer under test, which is beneficial for accurately reflecting the radial stress failure situation of the transformer under test and ensuring the equivalence and correctness of the study on the radial stress stability of the winding.

[0096] 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.

[0097] Those skilled in the art can understand that all or part of the processes in the above embodiments can be completed by a computer program instructing related hardware, and the program can be stored in a computer readable storage medium. When the program is executed, the processes of the above embodiments can be included. The storage medium can be a magnetic disc, an optical disc, a Read-Only Memory (ROM) or a Random Access Memory (RAM).

Claims

1. A transformer winding amplitude stress failure test model equivalent method when short-circuiting, characterized in that, The method comprises the following steps: determining a winding prototype and a specification of the winding prototype according to a transformer to be tested, combining the winding prototype and the specification of the winding prototype, and establishing a winding equivalent model; performing a radial force failure test on the winding equivalent model based on a predefined radial force failure mode to obtain first radial force failure characteristic values; performing a radial force failure test on the transformer to be tested based on the radial force failure mode to obtain second radial force failure characteristic values; determining whether to use the winding equivalent model as a winding radial force failure test model according to the first radial force failure characteristic values and the second radial force failure characteristic values; the step of determining whether to use the winding equivalent model as the winding radial force failure test model according to the first radial force failure characteristic values and the second radial force failure characteristic values specifically comprises: for each characteristic value, the first value of the characteristic value and the second value of the characteristic value are compared with a preset control range of the characteristic value; wherein the first radial force failure characteristic values include first values of a plurality of characteristic values, and the second radial force failure characteristic values include second values of a plurality of characteristic values; if the first values of each characteristic value and the second values of each characteristic value are within the preset control range of each characteristic value, it is determined that the winding equivalent model is used as the winding radial force failure test model; if any first value of the characteristic value or any second value of the characteristic value is outside the preset control range of any characteristic value, it is determined that the winding equivalent model is not used as the winding radial force failure test model.

2. The transformer short-circuit winding amplitude stress failure test model equivalent method of claim 1, wherein, the step of determining a winding prototype and a specification of the winding prototype according to a transformer to be tested specifically comprises: determining the winding prototype according to the structure of the winding of the transformer to be tested; determining the specification of the winding prototype based on a predefined radial force failure test condition; wherein the specification of the winding prototype includes a size ratio.

3. The transformer short-circuit winding amplitude stress failure test model equivalent method of claim 1, wherein, the step of performing a radial force failure test on the winding equivalent model based on a predefined radial force failure mode to obtain first radial force failure characteristic values specifically comprises: performing a radial force failure test on the winding equivalent model based on the radial force failure mode according to the radial force failure test standard of the transformer to be tested to obtain the first radial force failure characteristic values; wherein the radial force failure test standard of the transformer to be tested includes standard operating parameters and standard structure parameters of the transformer to be tested.

4. The transformer short-circuit winding amplitude stress failure test model equivalent method of claim 1, wherein, the step of comparing the first value of each characteristic value and the second value of each characteristic value with the preset control range of each characteristic value specifically comprises: according to the weight order of each characteristic value, a characteristic value is selected in turn, and the first value of the characteristic value and the second value of the characteristic value are compared with the preset control range of the characteristic value.

5. The transformer short-circuit winding amplitude stress failure test model equivalent method of claim 1, wherein, The method further comprises the following steps: when it is determined that the winding equivalent model is not used as the winding radial force failure test model, adjusting the winding equivalent model to establish a new winding equivalent model.

6. A model equivalent device for transformer winding amplitude stress failure test under short circuit, characterized in that, The method comprises the following steps: A winding equivalent model establishment module is configured to determine a winding prototype and specifications of the winding prototype according to a transformer to be tested, and establish a winding equivalent model in combination with the winding prototype and the specifications of the winding prototype; A first amplitude stress failure test module is configured to perform an amplitude stress failure test on the winding equivalent model based on a predefined amplitude stress failure mode, and obtain first amplitude stress failure characteristic values; A second amplitude stress failure test module is configured to perform an amplitude stress failure test on the transformer to be tested based on the amplitude stress failure mode, and obtain second amplitude stress failure characteristic values; A winding equivalent model judgment module is configured to determine whether to use the winding equivalent model as a winding amplitude stress failure test model according to the first amplitude stress failure characteristic values and the second amplitude stress failure characteristic values. The winding equivalent model judgment module comprises: A comparison unit is configured to compare, for each characteristic value, a first value of the characteristic value and a second value of the characteristic value with a preset control range of the characteristic value. The first amplitude stress failure characteristic values comprise first values of a plurality of characteristic values, and the second amplitude stress failure characteristic values comprise second values of the plurality of characteristic values. A judgment unit is configured to determine to use the winding equivalent model as the winding amplitude stress failure test model if the first values of the characteristic values and the second values of the characteristic values are all within the preset control range of the characteristic values. The judgment unit is further configured to determine not to use the winding equivalent model as the winding amplitude stress failure test model if any first value of the characteristic values or any second value of the characteristic values is outside the preset control range of the characteristic values.

7. The equivalent device of the transformer short-circuit winding amplitude force failure test model according to claim 6, characterized in that, The winding equivalent model establishment module comprises: A winding prototype determination unit is configured to determine the winding prototype according to a structure of a winding of the transformer to be tested. A winding prototype specification determination unit is configured to determine specifications of the winding prototype based on predefined amplitude stress failure test conditions. The specifications of the winding prototype comprise size ratios.

8. The equivalent device of the transformer short-circuit winding amplitude force failure test model according to claim 6, characterized in that, The first amplitude stress failure test module is specifically configured to perform an amplitude stress failure test on the winding equivalent model based on the amplitude stress failure mode according to an amplitude stress failure test standard of the transformer to be tested, and obtain the first amplitude stress failure characteristic values. The amplitude stress failure test standard of the transformer to be tested comprises standard operating parameters and standard structural parameters of the transformer to be tested.

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