Test method and system for analyzing the influence of transformer coil pre-tightening force on cumulative effect

Abstract

The application discloses a kind of test method and system for analyzing the influence of transformer coil pre-tightening force on cumulative effect.The method comprises: cutting a section from a transformer coil as a coil sample, respectively under each preset pre-tightening force, static bending test and dynamic bending test are carried out on the coil sample, and the static bending test results and dynamic bending test results of the coil sample under each preset pre-tightening force are obtained; collate the static bending test results and dynamic bending test results of the coil sample under all preset pre-tightening forces, obtain test results, and analyze the relationship between the pre-tightening force on the transformer coil and the cumulative effect according to the test results.The application can carry out static bending test and dynamic bending test on the coil sample under different pre-tightening forces, accurately reflect the short-circuit resistance performance of the transformer coil under different pre-tightening forces, and provide effective data for considering the influence of the pre-tightening force on the transformer coil on the cumulative effect and evaluating the short-circuit resistance of the transformer.

Description

Technical Field

[0001] This invention relates to the field of transformer short-circuit withstand capability assessment technology, and in particular to a test method and system for analyzing the influence of transformer coil preload on cumulative effects. Background Technology

[0002] After long-term operation, transformers often experience short-circuit faults, affecting their safe and stable operation and causing significant economic losses to the power grid. To ensure the safe and stable operation of transformers, it is usually necessary to assess their short-circuit withstand capability. However, existing methods for assessing transformer short-circuit withstand capability lack consideration of the cumulative effect of preload on the transformer coils. This makes it difficult to accurately reflect the transformer's short-circuit withstand performance under different preload conditions during testing, hindering effective assessment of the transformer's short-circuit withstand capability. Summary of the Invention

[0003] To overcome the shortcomings of existing technologies, this invention provides a test method and system for analyzing the influence of transformer coil preload on cumulative effects. This method can accurately reflect the short-circuit withstand performance of transformers under different preload conditions, providing a data basis for effectively evaluating the short-circuit withstand capability of transformers.

[0004] To address the aforementioned technical problems, in a first aspect, an embodiment of the present invention provides a test method for analyzing the effect of transformer coil preload on cumulative effects, comprising:

[0005] A section of the transformer coil is cut as a coil sample. Static bending test and dynamic bending test are performed on the coil sample under each preset preload to obtain the static bending test results and dynamic bending test results of the coil sample under each preset preload.

[0006] The static bending test results and dynamic bending test results of the coil specimens under the preset preload are compiled to obtain test results, and the relationship between the preload and cumulative effect on the transformer coil is analyzed based on the test results.

[0007] Furthermore, the static bending test results include static shear strength, and the dynamic bending test results include dynamic plasticity accumulation effect.

[0008] Furthermore, the static bending test and dynamic bending test are performed on the coil sample under each preset preload to obtain the static bending test results and dynamic bending test results of the coil sample under each preset preload, specifically as follows:

[0009] For each preset preload, a preload adjustment device is used to adjust the preload on the coil sample to the preset preload, and static bending test and dynamic bending test are performed on the coil sample respectively to obtain the static bending test results and dynamic bending test results of the coil sample under the preset preload.

[0010] Furthermore, the preload adjustment device includes a first coil positioning pin, a second coil positioning pin, a preload bolt, a spring force gauge, and a cable;

[0011] The first coil positioning pin is inserted into the opening at one end of the coil sample, and the second coil positioning pin is inserted into the opening at the other end of the coil sample. The first coil positioning pin is threadedly connected to the pre-tightening bolt, and the second coil positioning pin is fixedly connected to one end of the spring force gauge. The other end of the spring force gauge is fixedly connected to one end of the cable, and the other end of the cable is fixedly connected to the pre-tightening bolt.

[0012] Furthermore, the static bending test and dynamic bending test are performed on the coil sample respectively to obtain the static bending test results and dynamic bending test results of the coil sample under the preset preload, specifically as follows:

[0013] A universal testing machine was used to perform static bending tests and dynamic bending tests on the coil sample to obtain the static bending test results and dynamic bending test results of the coil sample under the preset preload.

[0014] Secondly, an embodiment of the present invention provides a test system for analyzing the effect of transformer coil preload on cumulative effects, comprising:

[0015] The coil sample testing module is used to cut a section from the transformer coil as a coil sample, and to perform static bending test and dynamic bending test on the coil sample under each preset preload, so as to obtain the static bending test results and dynamic bending test results of the coil sample under each preset preload.

[0016] The test data analysis module is used to organize the static bending test results and dynamic bending test results of the coil specimens under the preset preload to obtain test results, so as to analyze the relationship between the preload and cumulative effect on the transformer coil based on the test results.

[0017] Furthermore, the static bending test results include static shear strength, and the dynamic bending test results include dynamic plasticity accumulation effect.

[0018] Furthermore, the coil sample testing module is specifically used to adjust the preload on the coil sample to the preset preload using a preload adjustment device for each preset preload, and to perform static bending test and dynamic bending test on the coil sample respectively, so as to obtain the static bending test result and dynamic bending test result of the coil sample under the preset preload.

[0019] Furthermore, the preload adjustment device includes a first coil positioning pin, a second coil positioning pin, a preload bolt, a spring force gauge, and a cable;

[0020] The first coil positioning pin is inserted into the opening at one end of the coil sample, and the second coil positioning pin is inserted into the opening at the other end of the coil sample. The first coil positioning pin is threadedly connected to the pre-tightening bolt, and the second coil positioning pin is fixedly connected to one end of the spring force gauge. The other end of the spring force gauge is fixedly connected to one end of the cable, and the other end of the cable is fixedly connected to the pre-tightening bolt.

[0021] Furthermore, the coil sample testing module is specifically used to apply a universal testing machine to perform static bending tests and dynamic bending tests on the coil sample, respectively, to obtain the static bending test results and dynamic bending test results of the coil sample under the preset preload.

[0022] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0023] By cutting a section from the transformer coil as a coil sample, static and dynamic bending tests are conducted on the coil sample under each preset preload. The static and dynamic bending test results of the coil sample under each preset preload are obtained. The test results are then compiled to obtain the test results. Based on the test results, the relationship between the preload on the transformer coil and the cumulative effect can be analyzed. Static and dynamic bending tests can be conducted on the coil sample under different preloads, accurately reflecting the short-circuit withstand performance of the transformer coil under different preloads. This provides effective data for evaluating the transformer's short-circuit withstand capability by considering the influence of the preload on the cumulative effect of the transformer coil. Attached Figure Description

[0024] Figure 1 This is a flowchart illustrating a test method for analyzing the effect of transformer coil preload on cumulative effect according to the first embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram illustrating the curve of axial force on a transformer coil varying with axial preload in the first embodiment of the present invention.

[0026] Figure 3 This is a schematic diagram of the preload adjustment device exemplified in the first embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of a test system for analyzing the effect of transformer coil preload on cumulative effect according to the second embodiment of the present invention. Detailed Implementation

[0028] 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.

[0029] 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 processor as the execution subject.

[0030] like Figure 1 As shown, the first embodiment provides a test method for analyzing the effect of transformer coil preload on cumulative effect, including steps S1 to S2:

[0031] S1. Cut a section from the transformer coil as a coil sample, and conduct static bending test and dynamic bending test on the coil sample under each preset preload to obtain the static bending test results and dynamic bending test results of the coil sample under each preset preload.

[0032] S2. Compile the static bending test results and dynamic bending test results of all coil samples under the preset preload to obtain the test results, and analyze the relationship between the preload and cumulative effect on the transformer coil based on the test results.

[0033] In a preferred embodiment, the static bending test results include static shear strength, and the dynamic bending test results include dynamic plasticity cumulative effect.

[0034] As an example, in step S1, considering that the overall size of the transformer coil is large, a section is cut from the transformer coil as a coil sample for the convenience of subsequent tests.

[0035] Based on the actual test requirements, several preset preloads are obtained. For each preset preload, static bending test and dynamic bending test are performed on the coil sample under the preset preload to obtain the static bending test results and dynamic bending test results of the coil under the preset preload. Thus, the static bending test results and dynamic bending test results of the coil sample under each preset preload are obtained.

[0036] In step S2, the static bending test results and dynamic bending test results of all coil samples under the preset preload are compiled to obtain the test results. This allows for subsequent analysis of the relationship between the preload on the transformer coil and the cumulative effect based on the test results, and determination of the influence of the preload on the transformer coil on the cumulative effect.

[0037] It is understandable that the relationship between the preload on the transformer coil and the cumulative effect is very significant, primarily affecting the safety and reliability factor under a single short-circuit impact. The curve showing the change in axial force on the transformer coil with axial preload is shown below. Figure 2 As shown, by Figure 2 It can be seen that as the axial preload of the transformer coil increases, the axial force on the transformer coil increases to varying degrees. The engineering applicability of this phenomenon can be studied by conducting static and dynamic bending tests on coil samples under different preset preloads.

[0038] This embodiment can perform static and dynamic bending tests on coil samples under different preloads, accurately reflecting the short-circuit withstand performance of transformer coils under different preloads. It provides effective data for evaluating the transformer's short-circuit withstand capability by considering the influence of preload on the cumulative effect of the transformer coil.

[0039] In a preferred embodiment, the step of performing static bending tests and dynamic bending tests on the coil sample under each preset preload to obtain the static bending test results and dynamic bending test results of the coil sample under each preset preload specifically involves: for each preset preload, using a preload adjustment device to adjust the preload on the coil sample to the preset preload, and performing static bending tests and dynamic bending tests on the coil sample to obtain the static bending test results and dynamic bending test results of the coil sample under the preset preload.

[0040] In a preferred embodiment, the preload adjustment device includes a first coil positioning pin, a second coil positioning pin, a preload bolt, a spring force gauge, and a cable; the first coil positioning pin is inserted into an opening at one end of the coil sample, the second coil positioning pin is inserted into an opening at the other end of the coil sample, the first coil positioning pin is threadedly connected to the preload bolt, the second coil positioning pin is fixedly connected to one end of the spring force gauge, the other end of the spring force gauge is fixedly connected to one end of the cable, and the other end of the cable is fixedly connected to the preload bolt.

[0041] As an example, a schematic diagram of the preload adjustment device is shown below. Figure 3 As shown, the preload adjustment device includes a first coil positioning pin 101, a second coil positioning pin 102, a preload bolt 103, a spring force gauge 104, and a cable 105. The first coil positioning pin 101 is inserted into an opening at one end of the coil sample 106, and the second coil positioning pin 102 is inserted into an opening at the other end of the coil sample 106. The first coil positioning pin 101 is threadedly connected to the preload bolt 103. The hook on one end of the spring force gauge 104 hooks the second coil positioning pin 102, so that the second coil positioning pin 102 is fixedly connected to one end of the spring force gauge 104. The hook on the other end of the spring force gauge 104 is connected to the hook on one end of the cable 105, so that the other end of the spring force gauge 104 is fixedly connected to one end of the cable 105. The other end of the cable 105 is fixedly connected to the preload bolt 103.

[0042] For each preset preload, apply as follows: Figure 3 The preload adjustment device shown adjusts the preload on the coil sample 106 to the preset preload. Specifically, a rotational torque is continuously applied to the preload bolt 103, tightening or loosening it, causing the spring force gauge 104 to measure the preload on the coil sample 106. When the preload displayed on the spring force gauge 104 equals the preset preload, the rotational torque applied to the preload bolt 103 is stopped. Under the preset preload condition, a static bending test is performed on the coil sample 106 according to the three-point bending test standard GB / T 232-2021. The static shear strength of the coil sample 106 is used as the result of the static bending test. A dynamic bending test is also performed on the coil sample 106, with the dynamic load being P. max / 2+sin(200πt)P max / 2,P max The dynamic plastic cumulative effect of the test coil specimen 106 was taken as the result of the dynamic bending test, with a pressure of 10-80 MPa, a duration of 100-250 ms, and a cumulative number of 20 tests.

[0043] This embodiment designs a preload adjustment device to adjust the preload on the coil sample to a preset preload, which can accurately adjust the preload on the coil sample and efficiently improve test efficiency in different situations.

[0044] This embodiment utilizes a first testing device to perform static and dynamic tensile tests on the first device at each preset temperature. This allows for precise control of the testing temperature and efficient static and dynamic bending tests on coil samples under different preloads.

[0045] In a preferred embodiment, the step of performing static bending tests and dynamic bending tests on the coil sample to obtain the static bending test results and dynamic bending test results of the coil sample under a preset preload is specifically as follows: a universal testing machine is used to perform static bending tests and dynamic bending tests on the coil sample to obtain the static bending test results and dynamic bending test results of the coil sample under a preset preload.

[0046] As an example, a universal testing machine is a material testing machine that integrates functions such as tension, bending, compression, shear, and ring stiffness testing, and is mainly used for mechanical property testing of metallic and non-metallic materials.

[0047] This embodiment utilizes a universal testing machine to perform static and dynamic bending tests on coil samples, enabling efficient static and dynamic bending tests on coil samples under different preloads.

[0048] Based on the same inventive concept as the first embodiment, the second embodiment provides as follows: Figure 4 The test system shown is for analyzing the influence of transformer coil preload on cumulative effect. It includes: a coil sample test module 21, used to cut a section from the transformer coil as a coil sample, and perform static bending test and dynamic bending test on the coil sample under each preset preload to obtain the static bending test results and dynamic bending test results of the coil sample under each preset preload; and a test data analysis module 22, used to organize the static bending test results and dynamic bending test results of all coil samples under preset preload to obtain test results, so as to analyze the relationship between preload and cumulative effect on transformer coil based on the test results.

[0049] In a preferred embodiment, the static bending test results include static shear strength, and the dynamic bending test results include dynamic plasticity cumulative effect.

[0050] In a preferred embodiment, the coil sample test module 21 is specifically used to adjust the preload on the coil sample to the preset preload using a preload adjustment device for each preset preload, and to perform static bending test and dynamic bending test on the coil sample respectively, so as to obtain the static bending test result and dynamic bending test result of the coil sample under the preset preload.

[0051] In a preferred embodiment, the preload adjustment device includes a first coil positioning pin, a second coil positioning pin, a preload bolt, a spring force gauge, and a cable; the first coil positioning pin is inserted into an opening at one end of the coil sample, the second coil positioning pin is inserted into an opening at the other end of the coil sample, the first coil positioning pin is threadedly connected to the preload bolt, the second coil positioning pin is fixedly connected to one end of the spring force gauge, the other end of the spring force gauge is fixedly connected to one end of the cable, and the other end of the cable is fixedly connected to the preload bolt.

[0052] In a preferred embodiment, the coil sample testing module 21 is specifically used to apply a universal testing machine to perform static bending tests and dynamic bending tests on the coil sample, respectively, to obtain the static bending test results and dynamic bending test results of the coil sample under a preset preload.

[0053] In summary, implementing the embodiments of the present invention has the following beneficial effects:

[0054] By cutting a section from the transformer coil as a coil sample, static and dynamic bending tests are conducted on the coil sample under each preset preload. The static and dynamic bending test results of the coil sample under each preset preload are obtained. The test results are then compiled to obtain the test results. Based on the test results, the relationship between the preload on the transformer coil and the cumulative effect can be analyzed. Static and dynamic bending tests can be conducted on the coil sample under different preloads, accurately reflecting the short-circuit withstand performance of the transformer coil under different preloads. This provides effective data for evaluating the transformer's short-circuit withstand capability by considering the influence of the preload on the cumulative effect of the transformer coil.

[0055] 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.

[0056] 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. A test method for analyzing the effect of transformer coil preload on cumulative effect, characterized in that, include: A section of the transformer coil is cut as a coil sample. Static bending test and dynamic bending test are performed on the coil sample under each preset preload to obtain the static bending test results and dynamic bending test results of the coil sample under each preset preload. Specifically, the step of performing static bending tests and dynamic bending tests on the coil sample under each preset preload to obtain the static bending test results and dynamic bending test results of the coil sample under each preset preload is as follows: For each preset preload, a preload adjustment device is used to adjust the preload on the coil sample to the preset preload, and static bending tests and dynamic bending tests are performed on the coil sample to obtain the static bending test results and dynamic bending test results of the coil sample under the preset preload. The preload adjustment device includes a first coil positioning pin, a second coil positioning pin, a preload bolt, a spring force gauge, and a cable. The first coil positioning pin is inserted into an opening at one end of the coil sample, and the second coil positioning pin is inserted into an opening at the other end of the coil sample. The first coil positioning pin is threadedly connected to the preload bolt, and the second coil positioning pin is fixedly connected to one end of the spring force gauge. The other end of the spring force gauge is fixedly connected to one end of the cable, and the other end of the cable is fixedly connected to the preload bolt. The static bending test results and dynamic bending test results of the coil specimens under the preset preload are compiled to obtain test results, and the relationship between the preload and cumulative effect on the transformer coil is analyzed based on the test results.

2. The test method for analyzing the effect of transformer coil preload on cumulative effect as described in claim 1, characterized in that, The static bending test results include static shear strength, and the dynamic bending test results include dynamic plasticity cumulative effect.

3. The test method for analyzing the effect of transformer coil preload on cumulative effect as described in claim 1, characterized in that, The coil sample is subjected to static bending tests and dynamic bending tests respectively to obtain the static bending test results and dynamic bending test results of the coil sample under the preset preload, specifically as follows: A universal testing machine was used to perform static bending tests and dynamic bending tests on the coil sample to obtain the static bending test results and dynamic bending test results of the coil sample under the preset preload.

4. A test system for analyzing the effect of transformer coil preload on cumulative effects, characterized in that, include: The coil sample testing module is used to cut a section from the transformer coil as a coil sample, and to perform static bending test and dynamic bending test on the coil sample under each preset preload, so as to obtain the static bending test results and dynamic bending test results of the coil sample under each preset preload. Specifically, the step of performing static bending tests and dynamic bending tests on the coil sample under each preset preload to obtain the static bending test results and dynamic bending test results of the coil sample under each preset preload is as follows: For each preset preload, a preload adjustment device is used to adjust the preload on the coil sample to the preset preload, and static bending tests and dynamic bending tests are performed on the coil sample to obtain the static bending test results and dynamic bending test results of the coil sample under the preset preload. The preload adjustment device includes a first coil positioning pin, a second coil positioning pin, a preload bolt, a spring force gauge, and a cable. The first coil positioning pin is inserted into an opening at one end of the coil sample, and the second coil positioning pin is inserted into an opening at the other end of the coil sample. The first coil positioning pin is threadedly connected to the preload bolt, and the second coil positioning pin is fixedly connected to one end of the spring force gauge. The other end of the spring force gauge is fixedly connected to one end of the cable, and the other end of the cable is fixedly connected to the preload bolt. The test data analysis module is used to organize the static bending test results and dynamic bending test results of the coil specimens under the preset preload to obtain test results, so as to analyze the relationship between the preload and cumulative effect on the transformer coil based on the test results.

5. The test system for analyzing the effect of transformer coil preload on cumulative effect as described in claim 4, characterized in that, The static bending test results include static shear strength, and the dynamic bending test results include dynamic plasticity cumulative effect.

6. The test system for analyzing the effect of transformer coil preload on cumulative effect as described in claim 4, characterized in that, The coil sample testing module is specifically used to apply a universal testing machine to perform static bending tests and dynamic bending tests on the coil sample, respectively, to obtain the static bending test results and dynamic bending test results of the coil sample under the preset preload.

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