Reactor type selection method, type selection auxiliary tool and readable storage medium

Abstract

The application provides a reactor selection method, a selection auxiliary tool and a readable storage medium. The reactor selection method provided by the embodiment of the application comprises: obtaining a single-section inductance value; obtaining an equivalent inductance value of a preset reactor with the single-section inductance value in a preset combination mode; calculating a corresponding ground capacitance coverage range according to the equivalent inductance value; if the ground capacitance of a test piece is in the ground capacitance coverage range, configuring the reactor corresponding to the ground capacitance coverage range as the configuration of a test transformer. The reactor configuration comprises a preset reactor type, a preset section number and a preset combination mode. Through the method, the reactor configuration matched with the preset test transformer can be obtained, so that it is not necessary to repeatedly verify after the on-site configuration, thereby helping to reduce the configuration difficulty of the test transformer and improving the application range of the test transformer test method.

Description

Technical Field

[0001] This invention relates to the field of power frequency AC withstand voltage testing of electrical equipment, and more specifically, to a reactor selection method, selection aid tool, and readable storage medium. Background Technology

[0002] Currently, on-site AC withstand voltage testing for electrical equipment is divided into variable frequency series resonant withstand voltage testing and test transformer withstand voltage testing. Variable frequency series resonant withstand voltage testing uses an adjustable variable frequency power supply to bring the LC circuit to a resonant state, allowing for AC withstand voltage testing of test objects with large capacitance and high test voltage with a relatively small power supply capacity. With proper reactor configuration, it can be used flexibly on-site. However, it also has disadvantages such as complex wiring and high cost, making it difficult for variable frequency series resonant withstand voltage testing to become standard equipment for every project, given the characteristics of multi-project construction. Test transformer withstand voltage testing, on the other hand, has advantages such as simple wiring, convenient operation and portability, and an output voltage frequency closer to the equipment's operating conditions. As an essential AC withstand voltage testing device for construction companies, it is particularly suitable for on-site operation. However, when conducting AC withstand voltage tests on test objects with large capacitance (such as long-distance medium-voltage cables and medium-voltage motors), the capacity of the test transformer configured on-site is often insufficient to meet the test requirements, highlighting the increasing limitation of its applicability due to capacity constraints.

[0003] To address the aforementioned issues and improve the field applicability of test transformers, it is necessary to enhance their load-carrying capacity. Currently, a proposed iterative technical solution involves using parallel resonant reactors to increase the load-carrying capacity of the test transformers. However, the parameters and number of these parallel resonant reactors significantly influence the applicability of this testing method. Nevertheless, this technology currently suffers from difficulties in reactor selection, requiring repeated on-site configuration and verification. Summary of the Invention

[0004] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0005] The purpose of this invention is to provide a reactor selection method, selection aid tool, and readable storage medium, which can effectively improve the problem of reactor selection requiring repeated on-site configuration and verification, and the difficulty in selection.

[0006] Embodiments of the present invention can be implemented in the following ways:

[0007] A reactor selection method, the reactor selection method comprising:

[0008] Obtain the preset single-cell inductance value;

[0009] Obtain the equivalent inductance value of a preset number of reactors with the single-section inductance value under a preset combination method;

[0010] The corresponding ground capacitance coverage range is calculated based on the equivalent inductance value and the parameters of the preset test transformer.

[0011] If the ground capacitance of the test specimen is within the coverage area of ​​the ground capacitance, then the reactor corresponding to the ground capacitance coverage area is configured as a configuration that matches the preset test transformer; wherein, the reactor configuration includes a preset reactor type, a preset number of sections, and a preset combination method.

[0012] Optionally, the parameters of the preset test transformer include the output voltage and rated current of the preset test transformer; the step of calculating the corresponding ground capacitance coverage range based on the equivalent inductance value and the parameters of the preset test transformer includes: calculating the corresponding ground capacitance coverage range based on the equivalent inductance value under the output voltage, satisfying the condition that the output current of the preset test transformer is less than or equal to the rated current.

[0013] Alternatively, the corresponding ground capacitance coverage area can be calculated using the following formula:

[0014]

[0015] Among them, C X U is the capacitance to ground; U is the output voltage of the preset test transformer; L is the equivalent inductance value; f is the grid frequency; and I is the rated current of the preset test transformer.

[0016] Optionally, the step of obtaining the equivalent inductance value of a preset number of reactors with the single-section inductance value under a preset combination method includes:

[0017] Set the preset number of reactors;

[0018] The predetermined number of reactors can be determined through a series-parallel connection of all possible combinations; the predetermined combination includes all the aforementioned combinations.

[0019] Calculate the equivalent inductance value for each of the aforementioned combinations.

[0020] Optionally, the step of calculating the corresponding ground capacitance coverage area based on the equivalent inductance value and the parameters of the preset test transformer includes:

[0021] The coverage range of the multiple ground capacitances is calculated based on the equivalent inductance values ​​corresponding to all of the aforementioned combination methods.

[0022] After calculating the corresponding ground capacitance coverage area based on the equivalent inductance value, the reactor selection method further includes drawing a capacitance coverage diagram based on the multiple ground capacitance coverage areas; wherein the capacitance coverage diagram uses capacitance as the horizontal axis.

[0023] A reactor selection auxiliary tool is provided, which is used to perform the above-described reactor selection method.

[0024] A reactor selection aid tool, the reactor selection aid tool comprising:

[0025] The acquisition module is used to acquire a preset single-cell inductance value;

[0026] The calculation module is used to calculate the equivalent inductance value based on the preset single-section inductance value, and to calculate the corresponding ground capacitance coverage range based on the equivalent inductance value and the parameters of the preset test transformer; wherein, the equivalent inductance value is calculated based on a preset number of preset reactors in a preset combination mode; the preset reactor is a reactor having the preset single-section inductance value;

[0027] The output module is used to output the calculation results; if the ground capacitance of the test specimen is within the ground capacitance coverage area, the reactor corresponding to the ground capacitance coverage area is configured as a configuration that matches the preset test transformer; wherein, the reactor configuration includes a preset reactor type, a preset number of sections, and a preset combination method.

[0028] Optionally, the calculation module calculates the ground capacitance coverage area according to the following formula:

[0029]

[0030] Among them, C X U is the capacitance to ground; U is the output voltage of the preset test transformer; L is the equivalent inductance value; f is the grid frequency; and I is the rated current of the preset test transformer.

[0031] Optionally, the acquisition module is used to acquire multiple equivalent inductance values ​​of the same preset reactor under different combination methods; the reactor selection auxiliary tool also includes a drawing module, which is used to draw a capacitance coverage diagram based on the calculated capacitance coverage range to ground; wherein, the capacitance coverage diagram uses capacitance as the horizontal axis.

[0032] A readable storage medium storing a computer program for execution by a processor to implement the reactor selection method described above.

[0033] The beneficial effects of the reactor selection method, selection aid tool, and readable storage medium provided in the embodiments of the present invention include:

[0034] An embodiment of the present invention provides a reactor selection method, which includes obtaining the inductance value of a single section; obtaining the equivalent inductance value of a preset number of reactors with single-section inductance values ​​under a preset combination; calculating the corresponding ground capacitance coverage range based on the equivalent inductance value; if the ground capacitance of the test specimen is within the ground capacitance coverage range, then configuring the reactor corresponding to the ground capacitance coverage range as the configuration of the test transformer. The reactor configuration includes a preset reactor type, a preset number of sections, and a preset combination method. This method enables the acquisition of reactor configurations that match a pre-set test transformer. Specifically, when a test transformer is already available on-site, it is used as the pre-set test transformer, and reactor selection is obtained using the reactor selection method provided by this invention. In this way, by adopting a suitable reactor configuration, the existing test transformer can be applied to the testing of different test objects, thus improving applicability. When no test transformer is available on-site, this reactor selection method can provide a selection reference for test transformers and reactors without the need for repeated verification after configuration, thereby helping to reduce the configuration difficulty of test transformers and expand the applicability of the test transformer testing method.

[0035] Embodiments of the present invention also provide a reactor selection auxiliary tool, which is used to perform the above-described reactor selection method. Therefore, it can obtain a reactor configuration that matches the preset test transformer without repeated verification on site, thereby helping to reduce the configuration difficulty of the test transformer and improve the applicability of the test transformer test method.

[0036] An embodiment of the present invention also provides a reactor selection auxiliary tool, which includes an acquisition module for acquiring the equivalent inductance value; a calculation module for calculating the corresponding ground capacitance coverage range based on the equivalent inductance value; and an output module for outputting the calculation results. If the ground capacitance of the test specimen is within the ground capacitance coverage range, the reactor configuration corresponding to the ground capacitance coverage range is used as the configuration of the test transformer. The reactor configuration includes a preset reactor type, a preset number of sections, and a preset combination method.

[0037] Embodiments of the present invention also provide a readable storage medium through which the above-described reactor selection method can be implemented. Therefore, it also has the beneficial effect of eliminating the need for repeated verification on site, thereby helping to reduce the configuration difficulty of the test transformer and expand the applicability of the test transformer test method. Attached Figure Description

[0038] The above-described features and advantages of the present invention will be better understood after reading the following detailed description of embodiments of the present disclosure in conjunction with the accompanying drawings. In the drawings, components are not necessarily drawn to scale, and components having similar related characteristics or features may have the same or similar reference numerals.

[0039] Figure 1 A schematic diagram of the test transformer and reactor in parallel for withstand voltage compensation provided according to one aspect of the present invention is shown;

[0040] Figure 2 A schematic diagram of a capacitance coverage diagram according to one aspect of the present invention is shown;

[0041] Figure 3 A diagram showing multiple capacitor coverages with a preset voltage of 10kV and a single-cell inductance of 50H to 160H, according to one aspect of the present invention, is provided.

[0042] Figure 4 A diagram showing multiple capacitor coverages with a preset voltage of 16kV and a single-cell inductance of 50H to 160H, according to one aspect of the present invention, is provided.

[0043] Figure 5 A diagram showing multiple capacitor coverages with a preset voltage of 24kV and a single-cell inductance of 50H to 160H, according to one aspect of the present invention, is provided.

[0044] Figure 6 A table showing the analysis results of the ground capacitance coverage of 2-section, 4-section, 5-section, 6-section, 7-section, and 8-section reactors in different combinations according to one aspect of the present invention is provided. Detailed Implementation

[0045] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the aspects described below with reference to the accompanying drawings and specific embodiments are merely exemplary and should not be construed as limiting the scope of protection of the present invention in any way.

[0046] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," "outer," or "vertical" appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use, and does not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0047] At the same time, it should be noted that the terms "first" and "second" are used only for distinguishing descriptions and should not be interpreted as indicating or implying relative importance.

[0048] In the description of this invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an integral connection, or a detachable connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components, etc. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] Figure 1 The diagram illustrates the operating principle of a test transformer and reactor connected in parallel for voltage compensation. Based on the parallel resonance principle of LC circuits, the test transformer can effectively reduce its output current and thus improve its load-carrying capacity by connecting reactors in parallel. Figure 1 As shown, in the test transformer of the parallel reactor, reactor 10 is connected in parallel with test piece 20 and test transformer 30, where f is the power supply frequency in Hz; f0 is the parallel resonant frequency of the LC circuit in Hertz (Hz); I O I L I C These represent the output current of the test transformer, the inductor branch current, and the capacitor branch current, respectively, in amperes (A); L is the inductance of the reactor, in henries (H); R is the equivalent resistance of the reactor, in ohms (Ω); Cx is the capacitance of the test object, in farads (F); and U is the test voltage, in volts (V).

[0050] This invention provides a reactor selection method, selection aid tool, and readable storage medium. By using the above-mentioned reactor selection method, selection aid tool, and readable storage medium, the work of repeated on-site verification can be greatly reduced, and the applicability of the test transformer can be maximized.

[0051] The reactor selection method provided by this invention will be further described below:

[0052] The reactor selection method provided by this invention adopts the capacitance coverage method. Based on the parameter range of existing reactors on the market, it selects the reactor inductance value, analyzes the equivalent inductance values ​​of various combinations of a certain number of reactors, and calculates the range of test specimen capacitance values ​​to ground that can be covered under overcompensation and undercompensation conditions. This determines the reactor parameters with a more ideal coverage range, thereby facilitating the integration of a withstand voltage testing device suitable for testing all test specimens. Specifically, this reactor selection method includes the following steps:

[0053] S01: Obtain the preset single-cell inductance value.

[0054] The single-section inductance value can be selected from the inductance values ​​of commonly used reactors available on the market. The single-section inductance value is the inductance value L0 of a single-section reactor.

[0055] S02: Obtain the equivalent inductance value of a preset number of reactors with single-section inductance values ​​under a preset combination mode.

[0056] The reactor with the single-section inductance value obtained in step S01 is used as the preset reactor, and the preset number of sections of the preset reactor is set according to requirements. The preset number of preset reactors can be combined in m ways through series and parallel connections, and the preset combination methods include these m combinations. The corresponding equivalent inductance value is calculated for each of the m combinations. Specifically, the equivalent inductance value under the first combination method can be represented as L1, the equivalent inductance value under the second combination method can be represented as L2, and so on, with the equivalent inductance value under the m-th combination method being represented as Lm.

[0057] Specifically, Table 1 below shows the combination methods when the preset number of sections is 2 to 8, and the ratio of the equivalent inductance value to the single section inductance value corresponding to the combination method. As shown in Table 1 above, there are 3 combination methods when the preset number of sections is 2, 5 combination methods when the preset number of sections is 3, and 13 combination methods when the preset number of sections is 6.

[0058] Table 1

[0059]

[0060]

[0061] It should be noted that, in order to facilitate the representation of the ratio of equivalent inductance value to single-section inductance value under different combination methods, the combination methods with the same ratio of equivalent inductance value to single-section inductance value are displayed in the same row in Table 1 above.

[0062] S03: Calculate the corresponding ground capacitance coverage range based on the equivalent inductance value and the parameters of the preset test transformer.

[0063] The parameters of the preset test transformer include its output voltage and rated current. Specifically, if a test transformer is already available on-site, it is used as the preset transformer; otherwise, if no test transformer is available on-site, it can be one of the candidate test transformers. During calculation, the corresponding ground capacitance coverage area is calculated based on the preset condition that the output current of the preset test transformer is less than or equal to the rated current at the output voltage, according to the equivalent inductance value.

[0064] Specifically, the preset conditions are:

[0065] I0=|I C -IL |≤I;

[0066] Where I is the rated current of the preset test transformer.

[0067] After simplifying the above preset conditions, we get:

[0068]

[0069] Among them, C X is the capacitance to ground; U is the output voltage of the preset test transformer; L is the equivalent inductance value; f is the grid frequency.

[0070] Optionally, in this embodiment, I is 0.3, so the above-mentioned preset condition formula is:

[0071]

[0072] After simplification, we get:

[0073] It should be noted that the specific value range of the output current I0 of the test transformer in the preset conditions is not limited here. It is understood that in some other embodiments, the value range of the output current I0 of the test transformer can also be set according to the requirements. That is, in other embodiments, the specific value of I can be determined according to the preset parameters of the test transformer.

[0074] Substituting the equivalent inductance values ​​of the m combinations into the simplified formula above, we obtain the corresponding capacitance-to-ground coverage range. Specifically, the capacitance-to-ground coverage range obtained by substituting the equivalent inductance value L1 of the first combination into the simplified formula is expressed as: C1min≤C X1 ≤C1max; Similarly, substituting L2, L3...Lm respectively, the resulting ground capacitance coverage range can be expressed as C2min≤C X2 ≤C2max、C3min≤C X3 ≤C3max……Cmmin≤C Xm ≤Cmmax.

[0075] Furthermore, to more clearly demonstrate the ground capacitance coverage range corresponding to the equivalent inductance under different combinations, the reactor selection method provided by this invention further includes: drawing a capacitance coverage diagram based on multiple ground capacitance coverage ranges, wherein the capacitance coverage diagram uses capacitance C as the horizontal axis. Specifically, the capacitance coverage diagram is as follows: Figure 2 As shown.

[0076] S04: If the test specimen's capacitance to ground is within the coverage area of ​​the capacitance to ground, then the reactor configuration corresponding to the coverage area of ​​the capacitance to ground shall be used as the configuration of the test transformer.

[0077] If the capacitance to ground of the test specimen falls within the coverage area of ​​a certain capacitance to ground, it indicates that the reactor configuration corresponding to that capacitance coverage area can be used as the matching configuration for the preset test transformer. That is, the reactor configuration can be applied to the preset test transformer to achieve the purpose of testing the test specimen. The reactor configuration includes the preset reactor type, preset number of sections, and preset combination method.

[0078] For example, if the capacitance to ground of the test piece falls within the range of C3min to C3max, it means that the reactor type corresponding to the single-section inductance value obtained in step S01, the preset number of sections set in step S02, and the third combination method can be used to match the preset test transformer.

[0079] Furthermore, in order to ensure that the reactor selection is optimal, steps S01 to S04 can be repeated to iterate the preset single-section inductance value, preset number of sections, and preset voltage, and select the better one from the reactor configurations that can be used as preset test transformer configurations as the test transformer configuration during the test.

[0080] Furthermore, to simplify the above calculation and plotting processes, these processes can be performed by writing Matlab code.

[0081] The reactor selection method provided by the embodiments of the present invention can achieve the following: First, based on the test transformers and reactors already configured on site, it can be determined whether the test object can be tested or tested in a certain combination by referring to the capacitance coverage diagram; Second, based on the already configured test transformers, reactor selection can be completed without repeated verification, thereby improving the applicability of the already configured test transformers; Third, without repeated verification, it provides test transformer and reactor selection references for units that have not configured test transformers and reactors, thereby reducing the difficulty of configuring test transformers.

[0082] This invention also provides a reactor selection aid tool, which is used to perform the above-described reactor selection method. Using this reactor selection aid tool can greatly reduce the work of repeated on-site verification and facilitate the integration of a single withstand voltage testing device applicable to all test specimens.

[0083] This invention also provides a reactor selection aid tool, which includes an acquisition module, a calculation module, and an output module. The acquisition module acquires a preset inductance value. The calculation module calculates the equivalent inductance value based on the preset single-section inductance value, and calculates the corresponding ground capacitance coverage range based on the equivalent inductance value and the parameters of a preset test transformer. The equivalent inductance value is calculated based on a preset number of preset reactors in a preset combination mode; the preset reactors are reactors with preset single-section inductance values. The output module outputs the calculation results. Based on the calculation results, if the ground capacitance of the test specimen is within the ground capacitance coverage range, the reactor configuration corresponding to that ground capacitance coverage range is selected as the configuration matching the preset test transformer. The reactor configuration includes a preset reactor type, a preset number of sections, and a preset combination mode.

[0084] Optionally, in this embodiment, the condition for the selected reactor to meet the test requirements under the test voltage U is: I0 = |I C -I L Since |≤I, the calculation module calculates the coverage area of ​​the ground capacitance according to the following formula:

[0085]

[0086] Among them, C X For example, is the capacitance to ground; U is the output voltage of the preset test transformer; L is the equivalent inductance value; and f is the grid frequency. The actual value of the output voltage U of the preset test transformer can be set according to requirements.

[0087] Furthermore, the acquisition module is used to obtain multiple equivalent inductance values ​​of the same preset reactor under different combination methods. The reactor selection auxiliary tool also includes a drawing module, which is used to draw a capacitance coverage diagram based on the calculated capacitance to ground coverage area, wherein the capacitance coverage diagram uses capacitance C as the horizontal axis.

[0088] Embodiments of the present invention also provide a readable storage medium. Based on this understanding, all or part of the processes in the above-described method can also be implemented by computer program instructions. The computer program resides in the readable storage medium, and when executed by a processor, it can implement at least some steps of the above-described reactor selection method. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0089] Example 1

[0090] In this embodiment 1, the Matlab code tool was used to calculate and draw the different ground capacitance coverage range and capacitance coverage diagram of the three reactors under five series and parallel combination methods, according to the reactor selection method.

[0091] The Matlab code for calculation and plotting is as follows:

[0092]

[0093]

[0094] It should be noted that in the above code, "U=[10e3,16e3,24e3]" indicates that the preset test voltage output voltage is 10kV, 16kV, and 24kV. It is understood that the specific data for the preset test voltage output voltage in this code can be adjusted according to requirements. Similarly, "L0=50:10:160" indicates that the preset single-cell inductance L0 is 50~160, and the iteration step size is 10. It is understood that the specific data for the preset single-cell inductance in this code can be adjusted according to requirements. The "L_inde" in the above code... x = [1 / 3, 1 / 2, 1, 2, 3] represents the equivalent inductance values ​​corresponding to the five combinations. Specifically, the equivalent inductance value L1 in the first combination is 1 / 3L0, the equivalent inductance value L2 in the second combination is 1 / 2L0, the equivalent inductance value L3 in the third combination is 1L0, the equivalent inductance value L4 in the fourth combination is 2L0, and the equivalent inductance value L5 in the fifth combination is 3L0. It can be understood that the specific values ​​and quantities of the equivalent inductance values ​​in this code can be confirmed and adjusted according to the preset number of sections.

[0095] Figure 3 A multi-capacitor coverage diagram is shown when the preset voltage is 10kV and the single-cell inductance is 50H to 160H. Figure 4 A multi-capacitor coverage diagram is shown when the preset voltage is 16kV and the single-cell inductance is 50H to 160H. Figure 5 This diagram shows a coverage pattern of multiple capacitors with a preset voltage of 24kV and a single-cell inductance of 50H to 160H. According to... Figures 3-5 As shown in the capacitance coverage diagram, under a test voltage of 10kV, the capacitance to ground of the three reactors 50H-160H can cover a range of 0-200nF. Under a test voltage of 16kV, the capacitance to ground of 50H and 80H cannot cover 0-200nF. Under a test voltage of 24kV, the capacitance to ground of 50H-160H cannot meet the requirement of covering 0-400nF.

[0096] Based on the above process, similarly, the analysis results of the ground capacitance coverage of 2-section, 4-section, 5-section, 6-section, 7-section, and 8-section reactors under different combinations were calculated and plotted using Matlab code tools, as shown below. Figure 6 As shown in the table below. According to... Figure 6 The summary analysis of the results shows that reactors in sections 5, 6, 7, and 8 all meet the selection requirements. Among them, reactors in sections 7 and 8 have a relatively wide coverage range, which far exceeds the requirements of 0-200nF for 10kV and 16kV, and 0-400nF for 13.2kV, 17.4kV, and 24kV.

[0097] By selecting different reactor parameters and combinations of different numbers of reactors to determine the coverage range of the ground capacitance, the ideal reactor parameters and quantity for the coverage range can be determined. This enables precise selection and configuration of reactors, reduces the time spent on repeated on-site verification, and improves work efficiency.

[0098] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for selecting reactors, characterized in that, The reactor selection method includes: Obtain the preset single-cell inductance value; Obtain the equivalent inductance value of a preset number of reactors with the single-section inductance value under a preset combination method; The corresponding ground capacitance coverage range is calculated based on the equivalent inductance value and the parameters of the preset test transformer. If the ground capacitance of the test specimen is within the coverage area of ​​the ground capacitance, then the reactor corresponding to the ground capacitance coverage area is configured as a configuration that matches the preset test transformer; wherein, the reactor configuration includes a preset reactor type, a preset number of sections, and a preset combination method; The parameters of the preset test transformer include the output voltage and rated current of the preset test transformer; the step of calculating the corresponding ground capacitance coverage range based on the equivalent inductance value and the parameters of the preset test transformer includes: calculating the corresponding ground capacitance coverage range based on the equivalent inductance value under the output voltage, where the output current of the preset test transformer is less than or equal to the rated current.

2. The reactor selection method according to claim 1, characterized in that, The corresponding ground capacitance coverage area can be calculated using the following formula: ； in, Capacitance to ground; U is the output voltage of the preset test voltage converter; L is the equivalent inductance value; The power grid frequency; I The rated current of the preset test transformer.

3. The reactor selection method according to claim 1, characterized in that, The steps for obtaining the equivalent inductance value of a preset number of reactors with the single-cell inductance value under a preset combination method include: Set the preset number of reactors; The predetermined number of reactors can be determined through a series-parallel connection of all possible combinations; the predetermined combination includes all the aforementioned combinations. Calculate the equivalent inductance value for each of the aforementioned combinations.

4. The reactor selection method according to claim 3, characterized in that, The steps for calculating the corresponding ground capacitance coverage range based on the equivalent inductance value and the parameters of the preset test transformer include: The coverage range of the multiple ground capacitances is calculated based on the equivalent inductance values ​​corresponding to all of the aforementioned combination methods. After calculating the corresponding ground capacitance coverage area based on the equivalent inductance value, the reactor selection method further includes drawing a capacitance coverage diagram based on the multiple ground capacitance coverage areas; wherein the capacitance coverage diagram uses capacitance as the horizontal axis.

5. A reactor selection auxiliary tool, characterized in that, The reactor selection auxiliary tool is used to perform the reactor selection method as described in any one of claims 1-4.

6. A reactor selection auxiliary tool, characterized in that, The reactor selection aid includes: The acquisition module is used to acquire a preset single-cell inductance value; The calculation module is used to calculate the equivalent inductance value based on the preset single-section inductance value, and to calculate the corresponding ground capacitance coverage range based on the condition that the output current of the preset test transformer is less than or equal to the rated current of the preset test transformer under the output voltage of the preset test transformer. The equivalent inductance value is calculated based on a preset number of preset reactors in a preset combination. The preset reactors are reactors with the preset single-section inductance value. The output module is used to output the calculation results; if the ground capacitance of the test specimen is within the ground capacitance coverage area, the reactor corresponding to the ground capacitance coverage area is configured as a configuration that matches the preset test transformer; wherein, the reactor configuration includes a preset reactor type, a preset number of sections, and a preset combination method.

7. The reactor selection auxiliary tool according to claim 6, characterized in that, The calculation module calculates the ground capacitance coverage area according to the following formula: ； in, Capacitance to ground; U is the output voltage of the preset test voltage converter; L is the equivalent inductance value; The power grid frequency; I The rated current of the preset test transformer.

8. The reactor selection auxiliary tool according to claim 6, characterized in that, The acquisition module is used to acquire multiple equivalent inductance values ​​of the same preset reactor under different combination methods; the reactor selection auxiliary tool also includes a drawing module, which is used to draw a capacitance coverage diagram based on the calculated capacitance coverage range to ground; wherein, the capacitance coverage diagram uses capacitance as the horizontal axis.

9. A readable storage medium, characterized in that, The readable storage medium stores a computer program that is executed by a processor to implement the reactor selection method as described in any one of claims 1-4.

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