Electric reactor type selection method, type selection auxiliary tool and readable storage medium

Abstract

The invention provides an electric reactor type selection method, a type selection auxiliary tool and a readable storage medium. The electric reactor type selection method provided by the embodiment of the invention comprises the following steps: acquiring a single-section inductance value; obtaining the equivalent inductance value of a preset reactor with a preset section number and a single-section inductance value in a preset combination mode; calculating to obtain a corresponding ground capacitance coverage range according to the equivalent inductance value; and if the ground capacitance of the tested piece is within the coverage range of the ground capacitance, taking the reactor configuration corresponding to the coverage range of the ground capacitance as the configuration of the test transformer. The electric reactor configuration comprises a preset electric 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 repeated verification after field configuration is not needed, the configuration difficulty of the test transformer is reduced, and the application range of the test method of the test transformer is widened.

Description

Technical Field

[0001] The present invention relates to the field of power frequency AC withstand voltage test of electrical equipment, and in particular to a reactor selection method, a selection auxiliary tool and a readable storage medium. Background Art

[0002] At present, the AC withstand voltage test of electrical equipment on site is divided into variable frequency series resonant withstand voltage and test transformer withstand voltage. The variable frequency series resonant withstand voltage can make the LC circuit reach the resonant state through the adjustable variable frequency power supply, so that the AC withstand voltage test can be carried out on the test product with larger capacitance and higher test voltage with a smaller power supply capacity. Through the reasonable configuration of the reactor, it can be used flexibly on site, but it also has the disadvantages of complex wiring and high price. For the characteristics of multi-project construction, the variable frequency series resonant withstand voltage is difficult to become the standard debugging equipment for each project. The test transformer withstand voltage method has the characteristics of simple wiring, convenient operation and use, and the output voltage frequency is closer to the operating conditions of the equipment. As a necessary AC withstand voltage test equipment for construction units, it is particularly suitable for on-site operation. However, when conducting AC withstand voltage tests on test products with larger capacitance (such as long-distance medium-voltage cables, medium-voltage motors, etc.), the capacity of the test transformer configured on site is often difficult to meet the test requirements, and its applicability is increasingly limited by capacity.

[0003] In order to improve the above problems and improve the on-site applicability of the test transformer, it is necessary to improve the load capacity of the test transformer. At present, a technical iteration scheme for the withstand voltage of the test transformer is proposed, that is, to improve the load capacity of the test transformer by using a parallel resonant reactor. The parameters and quantity of the parallel resonant reactor will greatly affect the scope of application of the test method. However, the current technology has the problem that the selection of the reactor needs to be repeatedly verified after on-site configuration, and the selection is difficult. Summary of the invention

[0004] A brief summary of one or more aspects is given below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceived aspects, and is neither intended to identify the key or critical elements of all aspects nor to define the scope of any or all aspects. Its only purpose is to give some concepts of one or more aspects in a simplified form as a prelude to a more detailed description that will be given later.

[0005] The object of the present invention is to provide a method for selecting a reactor, a selection auxiliary tool and a readable storage medium, which can effectively improve the problem that the selection of the reactor requires repeated verification after on-site configuration and the selection is difficult.

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

[0007] A method for selecting a reactor, the method comprising:

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

[0009] Obtaining an equivalent inductance value of a preset reactor having a preset number of nodes and the single node inductance value in a preset combination mode;

[0010] The corresponding capacitance coverage range to ground is calculated according to the equivalent inductance value and the parameters of the preset test transformer;

[0011] If the capacitance to ground of the test piece is within the capacitance to ground coverage range, the reactor configuration corresponding to the capacitance to ground coverage range is used as the configuration matching the preset test transformer; wherein the reactor configuration includes a preset reactor type, a preset number of nodes, 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 condition that the output current of the preset test transformer is less than or equal to the rated current under the output voltage according to the equivalent inductance value.

[0013] Optionally, the corresponding ground capacitance coverage range is calculated according to the following formula:

[0014]

[0015] 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; I is the rated current of the preset test transformer.

[0016] Optionally, the step of obtaining an equivalent inductance value of a preset reactor having a preset number of nodes and a single node inductance value in a preset combination mode includes:

[0017] Setting the preset number of nodes of the preset reactor;

[0018] Determine all possible combinations of the preset reactors with a preset number of nodes that can be obtained by connecting them in series or in parallel; the preset combinations include all the combinations;

[0019] The equivalent inductance values ​​corresponding to all the combinations are calculated respectively.

[0020] Optionally, the step of calculating the corresponding ground capacitance coverage range according to the equivalent inductance value and the parameters of the preset test transformer includes:

[0021] Calculate the equivalent inductance values ​​corresponding to all the combinations to obtain multiple ground capacitance coverage ranges;

[0022] After the step of calculating the corresponding ground capacitance coverage range according to the equivalent inductance value, the reactor selection method further includes drawing a capacitance coverage map according to the multiple ground capacitance coverage ranges; wherein the capacitance coverage map uses capacitance as the horizontal coordinate.

[0023] A reactor selection auxiliary tool is provided, wherein the reactor selection auxiliary tool is used to execute the above reactor selection method.

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

[0025] An acquisition module, the acquisition module is used to acquire a preset single-section inductance value;

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

[0027] An output module, the output module is used to output the calculation results; if the capacitance to ground of the test piece is within the capacitance to ground coverage range, the reactor configuration corresponding to the capacitance to ground coverage range is used as the configuration matching 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 range according to the following formula:

[0029]

[0030] 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; I is the rated current of the preset test transformer.

[0031] Optionally, the acquisition module is used to obtain multiple equivalent inductance values ​​of the same preset inductor in different combinations; the inductor selection auxiliary tool also includes a drawing module, which is used to draw a capacitance coverage map based on the calculated ground capacitance coverage range; wherein the capacitance coverage map uses capacitance as the horizontal coordinate.

[0032] A readable storage medium stores a computer program, wherein the computer program is used to be executed by a processor to implement the reactor selection method as described above.

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

[0034] An embodiment of the present invention provides a method for selecting a reactor, which includes obtaining a single-section inductance value; obtaining an equivalent inductance value of a preset reactor with a preset number of sections and a 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 the test piece is within the ground capacitance coverage range, then using the reactor configuration 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 mode. The method can obtain a reactor configuration that matches a preset test transformer. Specifically, when a test transformer is already available on site, the test transformer is used as a preset test transformer and the reactor selection is obtained according to the reactor selection method provided by the present invention. In this way, the existing test transformer can be adapted to tests of different test products by adopting a suitable reactor configuration, thereby improving applicability. When a test transformer is not configured on site, the reactor selection method can serve as a reference for the selection of test transformers and reactors without the need for repeated verification after configuration, thereby helping to reduce the difficulty of configuring the test transformer and improving the scope of application of the test transformer test method.

[0035] An embodiment of the present invention also provides a reactor selection auxiliary tool, which is used to execute the above-mentioned reactor selection method. Therefore, it also has the beneficial effect of being able to obtain a reactor configuration that matches a preset test transformer without the need for repeated verification on site, thereby helping to reduce the difficulty of configuring the test transformer and improving the scope of application 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 an 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 result; if the ground capacitance of the test piece 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; wherein the reactor configuration includes a preset reactor type, a preset number of sections, and a preset combination method.

[0037] An embodiment of the present invention also provides a readable storage medium, through which the above-mentioned reactor selection method can be implemented, and therefore it also has the beneficial effect of not requiring repeated verification on site, thereby helping to reduce the difficulty of configuring the test transformer and improving the scope of application of the test transformer test method. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0041] Figure 3 It shows a plurality of capacitance coverage diagrams when the preset voltage is 10kV and the single-section inductance is 50H to 160H according to one aspect of the present invention;

[0042] Figure 4 It shows a plurality of capacitance coverage diagrams when the preset voltage is 16kV and the single-section inductance is 50H to 160H according to one aspect of the present invention;

[0043] Figure 5 It shows a plurality of capacitance coverage diagrams when the preset voltage is 24kV and the single-section inductance is 50H to 160H according to one aspect of the present invention;

[0044] Figure 6 A table showing the analysis results of the ground capacitance coverage range 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 shown. DETAILED DESCRIPTION

[0045] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. Note that the aspects described below in conjunction with the accompanying drawings and specific embodiments are only exemplary and should not be construed as limiting the scope of protection of the present invention in any way.

[0046] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", "vertical" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

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

[0048] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified or limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, an integral connection, or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or the internal communication of two components, etc. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] Figure 1 The schematic diagram of the test transformer and reactor parallel compensation withstand voltage operation is shown. Based on the parallel resonance principle of the LC circuit, the test transformer can effectively reduce the transformer output current by connecting a parallel reactor, thereby improving its load capacity, such as Figure 1 As shown, in the test transformer of the parallel reactor, the reactor 10 is arranged in parallel with the test object 20 and the test transformer 30, wherein f is the power supply frequency, Hz; f0 is the parallel resonance frequency of the LC loop, unit: Hertz (Hz); I O ,I L ,I C They are the output current of the test transformer, the inductance branch current, and the capacitance branch current, respectively, in ampere (A); L is the inductance value of the reactor, in henry (H); R is the equivalent resistance value of the reactor, in ohm (Ω); Cx is the capacitance of the test product, in farad (F); U is the test voltage, in volt (V).

[0050] The present invention provides a reactor selection method, a selection auxiliary tool and a readable storage medium. By using the above-mentioned reactor selection method, selection auxiliary 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 the present invention is further introduced below:

[0052] The reactor selection method provided by the present invention adopts a capacitance coverage method, which selects the reactor inductance value according to the existing reactor parameter range on the market, analyzes the equivalent inductance value under various combinations of a certain number of reactors, and calculates the range of the test piece's capacitance value to ground that can be covered under the conditions of over-compensation and under-compensation, thereby determining the reactor parameters with a relatively ideal coverage range, which in turn helps to integrate a set of withstand voltage test devices suitable for all test pieces. Specifically, the reactor selection method includes the following steps:

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

[0054] The single-section inductance value can be selected from the inductance value of the reactor that is available on the market and is more commonly used. The single-section inductance value is the inductance value L0 of the single-section reactor.

[0055] S02: Obtaining an equivalent inductance value of a preset reactor with a preset number of nodes and a single node inductance value in a preset combination mode.

[0056] The reactor having the single-section inductance value in step S01 is used as the preset reactor, and the preset number of sections of the preset reactor is set according to the requirements. The preset reactor of the preset number of sections has m combinations in series-parallel mode, and the preset combination mode includes the m combinations. The corresponding equivalent inductance values ​​are calculated for the m combinations respectively. Specifically, the equivalent inductance value under the first combination mode can be expressed as L1, the equivalent inductance value under the second combination mode can be expressed as L2... The equivalent inductance value under the mth combination mode can be expressed as Lm.

[0057] Specifically, the following Table 1 shows the combination modes when the preset number of nodes is 2 to 8 and the ratio of the equivalent inductance value corresponding to the combination mode to the single node inductance value. As shown in Table 1 above, when the preset number of nodes is 2, there are 3 combination modes, when the preset number of nodes is 3, there are 5 combination modes, and when the preset number of nodes is 6, there are 13 combination modes.

[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 in different combinations in Table 1 above, the combinations with the same ratio of equivalent inductance value to single-section inductance value are displayed in the same row.

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

[0063] The parameters of the preset test transformer include the output voltage and rated current of the preset test transformer. Specifically, if a test transformer is already available on site, the test transformer available on site is used as the preset transformer, or if there is no test transformer on site, the preset test transformer can be one of the test transformers to be selected. During calculation, the corresponding capacitance coverage range to ground 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 when the equivalent inductance value satisfies the output voltage.

[0064] Specifically, the preconditions are:

[0065] I0=|I C -IL |≤I;

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

[0067] The above preconditions are simplified to:

[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 preset condition formula is:

[0071]

[0072] After simplification, we get:

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

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

[0075] Furthermore, in order to more clearly show the coverage range of the ground capacitance corresponding to the equivalent inductance under different combinations, the reactor selection method provided by the present invention also includes: drawing a capacitance coverage map according to multiple ground capacitance coverage ranges, wherein the capacitance coverage map uses capacitance C as the horizontal axis. Specifically, the capacitance coverage map is as follows: Figure 2 shown.

[0076] S04: If the capacitance to ground of the test piece is within the capacitance to ground coverage range, the reactor configuration corresponding to the capacitance to ground coverage range is used as the configuration of the test transformer.

[0077] If the capacitance to ground of the test piece falls within the above-mentioned capacitance to ground coverage range, it means that the reactor configuration corresponding to the capacitance to ground coverage range can be used as the configuration matched with 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 piece. The reactor configuration includes the preset reactor type, the preset number of nodes, and the preset combination mode.

[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 the above 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 more optimal, steps S01 to S04 can be repeatedly executed to iterate the preset single-section inductance value, the preset number of sections and the preset voltage, and a better one can be selected from the obtained reactor configurations that can be used as the preset test transformer configuration as the test transformer configuration during the test.

[0080] Furthermore, in order to simplify the above-mentioned calculation process and drawing process, the above-mentioned calculation process and drawing process can be performed by writing Matlab code.

[0081] The reactor selection method provided by the embodiment of the present invention can achieve the following: first, based on the test transformers and reactors configured on site, it can be determined by searching the capacitance coverage map whether the test product can be tested or whether the test can be performed in a certain combination; second, based on the configured test transformers, the reactor selection is completed without repeated verification, thereby improving the applicability of the configured test transformers; third, without repeated verification, a test transformer and reactor selection reference is provided for units that are not configured with test transformers and reactors, thereby reducing the difficulty of configuring the test transformers.

[0082] The present invention also provides a reactor selection auxiliary tool, which is used to execute the reactor selection method. The reactor selection auxiliary tool can greatly reduce the work of repeated verification on site, which is conducive to integrating a set of withstand voltage test devices suitable for all test pieces.

[0083] The present invention also provides a reactor selection auxiliary tool, which includes an acquisition module, a calculation module and an output module. The acquisition module is used to obtain a preset inductance value. The calculation module is used to calculate the equivalent inductance value based on the preset single-section inductance value, and calculate the corresponding ground capacitance coverage range based on the equivalent inductance value and the parameters of the preset test transformer. Among them, the equivalent inductance value is calculated according to the preset reactor with a preset number of sections in a preset combination method; the preset reactor is a reactor with a preset single-section inductance value. The output module is used to output the calculation result. According to the calculation result, if the ground capacitance of the test piece is within the ground capacitance coverage range, the reactor configuration corresponding to the ground capacitance coverage range is used as the configuration matching the preset test transformer. Among them, the reactor configuration includes a preset reactor type, a preset number of sections and a preset combination method.

[0084] Optionally, in this embodiment, the condition that the selected reactor meets the test requirements under the test voltage U is: I0=|I C -I L |≤I, therefore, the calculation module calculates the ground capacitance coverage range according to the following formula:

[0085]

[0086] 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. 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 in different combinations. The reactor selection auxiliary tool also includes a drawing module, which is used to draw a capacitance coverage map based on the calculated ground capacitance coverage range, wherein the capacitance coverage map uses capacitance C as the horizontal coordinate.

[0088] The embodiment of the present invention also provides a readable storage medium. Based on such an understanding, the present invention implements all or part of the processes in the above method, which can also be completed by computer program instructions. The computer program is stored in a readable storage medium. When the computer program is executed by the processor, it can implement at least some of the steps in the above reactor selection method. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium. It should be noted that the content contained in the computer readable medium can be appropriately increased or decreased 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 electric carrier signal and telecommunication signal.

[0089] Example 1

[0090] In this embodiment 1, the Matlab code tool is used to calculate and draw different ground capacitance coverage ranges and capacitance coverage diagrams of three reactors in five series-parallel combinations according to the reactor selection method.

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

[0092]

[0093]

[0094] It should be noted that in the above code, "U=[10e3,16e3,24e3]" means that the preset test voltage output voltage is 10kV, 16kV and 24kV. It can be understood that the specific data of the preset test voltage output voltage in the code can be adjusted according to the needs; in the above code, "L0=50:10:160" means that the preset single-section inductance L0 is 50~160, and the iteration step is 10. It can be understood that the specific data of the preset single-section inductance in the code can be adjusted according to the needs; in the above code, "L_inde 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 the code can be confirmed and adjusted according to the preset number of nodes.

[0095] Figure 3 It shows multiple capacitance coverage diagrams when the preset voltage is 10kV and the single-section inductance is 50H to 160H; Figure 4 It shows multiple capacitance coverage diagrams when the preset voltage is 16kV and the single-section inductance is 50H to 160H; Figure 5 The figure shows multiple capacitance coverage diagrams when the preset voltage is 24kV and the single-section inductance is 50H to 160H. Figure 3 to Figure 5 It can be seen from the capacitance coverage diagram that under the test voltage of 10kV, the 50H-160H capacitance to ground of the three-section reactor can cover the range of 0-200nF. Under the test voltage of 16kV, 0-200nF cannot be covered at 50H and 80H. Under the test voltage of 24kV, the 50H-160H capacitance to ground cannot meet the requirement of covering 0-400nF.

[0096] According to the above process, similarly, the Matlab code tool is used to calculate and draw the analysis results of the ground capacitance coverage range of 2-section, 4-section, 5-section, 6-section, 7-section, and 8-section reactors in different combinations. Figure 6 As shown in the table. Figure 6 From the summary analysis of the results shown, it can be seen that 5, 6, 7, and 8 reactors all meet the selection requirements, among which 7 and 8 reactors have a relatively wide coverage range, far exceeding the requirements of 10kV and 16kV covering 0-200nF, and 13.2kV, 17.4kV, and 24kV covering 0-400nF.

[0097] By selecting different reactor parameters and different numbers of reactor combinations to cover the capacitance to ground, the ideal reactor parameters and number can be determined, thereby achieving accurate selection and configuration of reactors, reducing the time for repeated on-site verification, and improving work efficiency.

[0098] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technology in the field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for selecting a reactor, characterized in that: The reactor selection method includes: Get the preset single-cell inductance value; Obtaining an equivalent inductance value of a preset reactor having a preset number of nodes and the single node inductance value in a preset combination mode; The corresponding capacitance coverage range to ground is calculated according to the equivalent inductance value and the parameters of the preset test transformer; If the capacitance to ground of the test piece is within the capacitance to ground coverage range, the reactor configuration corresponding to the capacitance to ground coverage range is used as the configuration matching the preset test transformer; wherein the reactor configuration includes a preset reactor type, a preset number of nodes, and a preset combination method.

2. The method for selecting a reactor according to claim 1, characterized in that: 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 according to the equivalent inductance value and the parameters of the preset test transformer includes: calculating the corresponding ground capacitance coverage range according to the condition that the output current of the preset test transformer is less than or equal to the rated current under the output voltage based on the equivalent inductance value.

3. The method for selecting a reactor according to claim 2, characterized in that: The corresponding capacitance coverage range to ground is calculated according to the following formula: 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; I is the rated current of the preset test transformer.

4. The method for selecting a reactor according to claim 1, characterized in that: The step of obtaining an equivalent inductance value of a preset reactor having a preset number of nodes and a single node inductance value in a preset combination mode comprises: Setting the preset number of nodes of the preset reactor; Determine all possible combinations of the preset reactors with a preset number of nodes that can be obtained by connecting them in series or in parallel; the preset combinations include all the combinations; The equivalent inductance values ​​corresponding to all the combinations are calculated respectively.

5. The method for selecting a reactor according to claim 4, characterized in that: The step of calculating the corresponding ground capacitance coverage range according to the equivalent inductance value and the parameters of the preset test transformer includes: Calculate the equivalent inductance values ​​corresponding to all the combinations to obtain multiple ground capacitance coverage ranges; After the step of calculating the corresponding ground capacitance coverage range according to the equivalent inductance value, the reactor selection method further includes drawing a capacitance coverage map according to the multiple ground capacitance coverage ranges; wherein the capacitance coverage map uses capacitance as the horizontal coordinate.

6. A reactor selection auxiliary tool, characterized in that: The reactor selection auxiliary tool is used to execute the reactor selection method according to any one of claims 1 to 5.

7. A reactor selection auxiliary tool, characterized in that: The reactor selection aid tool includes: An acquisition module, the acquisition module is used to acquire a preset single-section inductance value; A calculation module, the calculation module is used to calculate an equivalent inductance value according to the preset single-section inductance value, and calculate a corresponding ground capacitance coverage range according to the equivalent inductance value and the parameters of a preset test transformer; wherein the equivalent inductance value is calculated according to a preset reactor with a preset number of sections in a preset combination mode; the preset reactor is a reactor having the preset single-section inductance value; An output module, the output module is used to output the calculation results; if the capacitance to ground of the test piece is within the capacitance to ground coverage range, the reactor configuration corresponding to the capacitance to ground coverage range is used as the configuration matching the preset test transformer; wherein the reactor configuration includes a preset reactor type, a preset number of sections and a preset combination method.

8. The reactor selection auxiliary tool according to claim 7, characterized in that: The calculation module calculates the ground capacitance coverage range according to the following formula: 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; I is the rated current of the preset test transformer.

9. The reactor selection auxiliary tool according to claim 7, characterized in that: The acquisition module is used to obtain multiple equivalent inductance values ​​of the same preset inductor in different combinations; the inductor selection auxiliary tool also includes a drawing module, which is used to draw a capacitance coverage map according to the calculated ground capacitance coverage range; wherein the capacitance coverage map uses capacitance as the horizontal coordinate.

10. A readable storage medium, characterized in that: The readable storage medium stores a computer program, and the computer program is used to be executed by a processor to implement the reactor selection method according to any one of claims 1 to 5.

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