Tap winding configuration method of a high-current generator and high-current generator

Abstract

The present application relates to the technical field of large current generator, disclose a kind of tap winding configuration method of large current generator.The present application method determines the winding division of the secondary side of three-phase transformer by the output level number threshold of output current, and installs tap on the two sides of the independent winding divided, and then adjusts the connection mode of each tap according to the required output current;The present application realizes the shunt of multiple windings, can reduce the design line diameter of winding to reduce the weight of winding, the configuration of tap enables to adjust the output current of large current generator by adjusting the connection mode of tap, solves the technical problem that the adaptability and flexibility of existing large current generator is poor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of large current generator, in particular to a tap winding configuration method of large current generator and large current generator. BACKGROUND

[0002] The currently widely used large current generator does not have the function of output current adjustment, which may cause energy loss due to too large output current or cannot meet the application needs due to too small output current in actual use; and the design line diameter of the secondary side winding of the large current generator transformer is too large, resulting in too large winding weight.

[0003] The above shortcomings greatly limit the adaptability and flexibility of the current large current generator. SUMMARY

[0004] The present application provides a tap winding configuration method of large current generator and large current generator, which solves the technical problem of poor adaptability and flexibility of the existing large current generator.

[0005] The first aspect of the present application provides a tap winding configuration method of large current generator, comprising:

[0006] determining the total number of turns of the secondary side winding of the three-phase transformer in the large current generator;

[0007] determining the number of independent windings of the secondary side of the three-phase transformer according to the output stage number threshold of the output current, and the number of turns of each independent winding is equal to the total number of turns divided by the output stage number threshold;

[0008] installing a tap on both sides of each independent winding;

[0009] adjusting the connection mode of each tap according to the required output current.

[0010] According to an implementable manner of the first aspect of the present application, the determination of the total number of turns of the secondary side winding of the three-phase transformer in the large current generator comprises:

[0011] determining the minimum magnetic flux density and cross-sectional area of the core of the three-phase transformer;

[0012] determining the secondary side electromotive force of the three-phase transformer according to the minimum magnetic flux density and cross-sectional area;

[0013] calculating the total number of turns according to the secondary side electromotive force, the power supply voltage and the rated transformation ratio of the three-phase transformer.

[0014] According to an implementable manner of the first aspect of the present application, the secondary side electromotive force is calculated according to the following formula:

[0015] e t = 4.44fBA

[0016] In the formula, f is the working frequency of the three-phase transformer, B is the minimum magnetic flux density of the iron core, and A is the cross-sectional area of the iron core.

[0017] According to an implementable manner of the first aspect of the application, the total number of turns of the winding is calculated according to the following formula:

[0018]

[0019] In the formula, N represents the total number of turns of the winding, U represents the power supply voltage, k represents the rated transformation ratio, e t represents the secondary side turn electromotive force.

[0020] According to an implementable manner of the first aspect of the application, the method further comprises:

[0021] If the N is not an integer, the total number of turns of the winding of the secondary side of the three-phase transformer is re-determined as int(N)+1, and int(N) represents the integer part of N.

[0022] According to an implementable manner of the first aspect of the application, the method further comprises:

[0023] If the N is not an integer, the iron core of the three-phase transformer is replaced according to the re-determined total number of turns of the winding.

[0024] According to an implementable manner of the first aspect of the application, the connection mode of each tap according to the required output current comprises:

[0025] determining the output stage of the output current according to the required output current;

[0026] connecting the corresponding tap according to the determined output stage.

[0027] According to an implementable manner of the first aspect of the application, the connecting the corresponding tap according to the determined output stage comprises:

[0028] when the required output current is the maximum value, connecting each tap so that all the independent windings are connected in series.

[0029] According to an implementable manner of the first aspect of the application, the connecting the corresponding tap according to the determined output stage further comprises:

[0030] when the required output current is the minimum value, connecting each tap so that all the independent windings are connected in parallel.

[0031] The second aspect of the present application provides a large current generator, the large current generator comprising a three-phase transformer, the secondary winding of the three-phase transformer being configured with the tap winding configuration method of the large current generator according to any one of the above embodiments.

[0032] From the above technical solutions, the present application has the following advantages:

[0033] In the embodiment of the present application, the number threshold of the output stage of the output current is used to determine the winding division of the secondary side of the three-phase transformer, and the tap is installed on both sides of the divided independent winding, and then the connection mode of each tap is adjusted according to the required output current; the present application realizes multi-winding shunt, which can reduce the design line diameter of the winding to reduce the weight of the winding, and the configuration of the tap enables the output current of the large current generator to be adjusted by adjusting the connection mode of the tap, solving the technical problem of poor adaptability and flexibility of the existing large current generator, which is beneficial to reduce the transformer loss, prolong the service life, improve the use efficiency and economy, so that it is better applied to various fields of power system, ensuring the safe and stable operation of the entire power system, reducing the economic loss and social influence caused by the disaster shutdown of the power system. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0035] Figure 1 The flow chart of the tap winding configuration method of the large current generator for an optional embodiment of the present application;

[0036] Figure 2 The winding schematic diagram after installing the tap for an optional embodiment of the present application. DETAILED DESCRIPTION

[0037] The embodiment of the present application provides a tap winding configuration method of a large current generator and a large current generator, which are used to solve the technical problem of poor adaptability and flexibility of the existing large current generator.

[0038] In order to make the application purposes, features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the following described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0039] Please refer to Figure 1 , Figure 1 The flow chart of the tap winding configuration method of the large-current generator provided by the embodiments of the present application.

[0040] The tap winding configuration method of the large-current generator provided by the present application comprises:

[0041] S1 determines the total number of turns of the winding at the secondary side of the three-phase transformer in the large-current generator.

[0042] In an implementable manner, the determination of the total number of turns of the winding at the secondary side of the three-phase transformer in the large-current generator comprises:

[0043] determining the minimum magnetic flux density and the cross-sectional area of the core of the three-phase transformer;

[0044] determining the secondary side turn electromotive force of the three-phase transformer according to the minimum magnetic flux density and the cross-sectional area;

[0045] calculating the total number of turns of the winding according to the secondary side turn electromotive force, the power supply voltage and the rated transformation ratio of the three-phase transformer.

[0046] Wherein, for small transformers, the cross section of the core is usually rectangular or square, and for large transformers, the cross section of the core is usually stepped to make full use of the space. When selecting the core material, the structure and size of the core material can be determined according to the space available for winding of the three-phase transformer.

[0047] Further, when configuring the winding of the three-phase transformer, the concentric coaxial inner and outer double-layer winding or coaxial upper and lower single-layer winding mode of the primary and secondary windings can be selected according to the structure and size of the core.

[0048] In an implementable manner, the secondary side turn electromotive force is calculated according to the following formula:

[0049] e t =4.44fBA

[0050] Wherein, f is the working frequency of the three-phase transformer, B is the minimum magnetic flux density of the core, and A is the cross-sectional area of the core.

[0051] In one feasible manner, the total number of turns of the winding is calculated according to the following formula:

[0052]

[0053] In the formula, N represents the total number of turns in the winding, U represents the power supply voltage, k represents the rated turns ratio, and e t This represents the electromotive force of the secondary turn.

[0054] In this embodiment of the invention, the total number of turns of the winding is determined in the above manner, which is simple and convenient.

[0055] In one feasible implementation, the method further includes:

[0056] If N is not an integer, then the total number of turns of the winding on the secondary side of the three-phase transformer is redefined as int(N)+1, where int(N) represents rounding down N.

[0057] Considering that the calculated total number of turns of the winding is not an integer, this embodiment of the invention takes an integer greater than N as the value of the total number of turns of the winding.

[0058] In one feasible implementation, the method further includes:

[0059] If N is not an integer, the core of the three-phase transformer is replaced according to the newly determined total number of winding turns to change the value of minimum magnetic flux density and / or cross-sectional area.

[0060] S2 determines the number of independent windings on the secondary side of the three-phase transformer based on the output stage number threshold of the output current. The number of turns of each independent winding is equal to the total number of turns of the winding divided by the output stage number threshold.

[0061] The threshold number of output stages can be set according to actual needs. This output stage is commonly referred to as a "stage". When the current applied to the rated load requires multiple output stages, and the adjacent output stages satisfy an arithmetic progression relationship, the transformer output voltage also correspondingly satisfies an arithmetic progression relationship with multiple output stages.

[0062] Wherein, the number of independent windings on the secondary side of the three-phase transformer is greater than or equal to the threshold number of output stages for the output current. Preferably, the number of independent windings on the secondary side of the three-phase transformer is equal to the threshold number of output stages for the output current.

[0063] For example, if the current of the high current generator needs to have M outputs, then the threshold for the number of output stages is set to M, and correspondingly, the number of independent windings on the secondary side of the three-phase transformer is determined to be M.

[0064] S3 installs taps on both sides of each of the independent windings.

[0065] likeFigure 2 As shown, there are 6 independent windings, each of which is connected to 2 taps, namely "Tap 1-1", "Tap 1-2", "Tap 2-1", "Tap 2-2", "Tap 3-1", "Tap 3-2", "Tap 4-1", "Tap 4-2", "Tap 5-1", "Tap 5-2", "Tap 6-1", and "Tap 6-2".

[0066] S4 adjusts the connection method of each tap according to the required output current.

[0067] Because multiple independent windings are set up, multiple different current outputs can be achieved depending on the tap connection method, that is, multiple output stages.

[0068] In one feasible manner, adjusting the connection method of each tap according to the required output current includes:

[0069] Determine the output stage based on the required output current;

[0070] Connect the corresponding taps according to the determined output stage.

[0071] When the required output current is at its maximum value, the output stage needs to be adjusted to its maximum. In this case, all the taps need to be connected so that all the independent windings are connected in series. When the required output current is at its minimum value, the output stage needs to be adjusted to its minimum value. In this case, all the taps need to be connected so that all the independent windings are connected in parallel.

[0072] For the same load, the output current of other output stages can also be achieved by adjusting the connection method of each of the aforementioned taps.

[0073] For example, when there are 6 independent windings, by adjusting the connection method of each tap, the current of the first output stage (maximum output current) can be obtained by connecting the 6 independent windings in series; by connecting 5 windings in series and discarding 1 winding, the current of the second output stage (5 / 6 of the first output stage) can be obtained; by connecting 4 windings in series and discarding 2 windings, the current of the third output stage (2 / 3 of the first output stage) can be obtained; by connecting 3 windings in series into 2 groups and then connecting them in parallel between the groups, the current of the fourth output stage (1 / 2 of the first output stage) can be obtained; by connecting 2 windings in series into 3 groups and then connecting them in parallel between the groups, the current of the fifth output stage (1 / 3 of the first output stage) can be obtained; and by connecting all 6 windings in parallel, the current of the sixth output stage (1 / 6 of the first output stage) can be obtained.

[0074] In one feasible embodiment, after adjusting the connection method of each tap according to the required output current, the method further includes:

[0075] The output terminal of the three-phase transformer is connected to a three-phase rectifier circuit, and the rectified output is sent to the load.

[0076] The present invention also provides a high current generator, the high current generator including a three-phase transformer, wherein the secondary winding of the three-phase transformer is configured with taps using the tap winding configuration method of the high current generator as described in any of the above embodiments.

[0077] The above embodiments of the present invention realize multi-winding shunt, which can reduce the design wire diameter of the winding to reduce the winding weight. The configuration of the taps allows the output current of the high current generator to be adjusted by adjusting the connection method of the taps. This solves the technical problem of poor adaptability and flexibility of existing high current generators, which is conducive to reducing transformer losses, extending service life, improving efficiency and economy, and thus enabling it to be better applied to various fields of the power system, ensuring the safe and stable operation of the entire power system, and reducing the economic losses and social impact caused by power system disasters and outages.

[0078] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for configuring the tap winding of a high-current generator, characterized in that, include: Determine the total number of turns of the secondary winding of the three-phase transformer in the high current generator; The number of independent windings on the secondary side of the three-phase transformer is determined based on the output stage number threshold of the output current. The number of turns of each independent winding is equal to the total number of turns of the winding divided by the output stage number threshold. Taps are installed on both sides of each of the independent windings; Adjust the connection method of each tap according to the required output current; The determination of the total number of turns of the secondary winding of the three-phase transformer in the high-current generator includes: Determine the minimum magnetic flux density and cross-sectional area of ​​the core of the three-phase transformer; The secondary turn electromotive force of the three-phase transformer is determined based on the minimum magnetic flux density and cross-sectional area. Calculate the total number of turns of the winding based on the secondary side electromotive force, the power supply voltage of the three-phase transformer, and the rated turns ratio; The secondary turn electromotive force is calculated according to the following formula: And t =4.44fBA In the formula, f is the operating frequency of the three-phase transformer, B is the minimum magnetic flux density of the iron core, and A is the cross-sectional area of ​​the iron core. The total number of turns of the winding is calculated using the following formula: In the formula, N represents the total number of turns in the winding, U represents the power supply voltage, k represents the rated turns ratio, and e t This represents the electromotive force of the secondary turn.

2. The tap winding configuration method for a high-current generator according to claim 1, characterized in that, The method further includes: If N is not an integer, then the total number of turns of the winding on the secondary side of the three-phase transformer is redefined as int(N)+1, where int(N) represents rounding down N.

3. The tap winding configuration method for a high-current generator according to claim 2, characterized in that, The method further includes: If N is not an integer, the core of the three-phase transformer shall be replaced according to the newly determined total number of winding turns.

4. The tap winding configuration method for a high-current generator according to claim 1, characterized in that, The method of adjusting the connection mode of each tap according to the required output current includes: Determine the output stage based on the required output current; Connect the corresponding taps according to the determined output stage.

5. The tap winding configuration method for a high-current generator according to claim 4, characterized in that, The step of connecting the corresponding tap according to the determined output stage includes: When the required output current is at its maximum, connect each of the taps so that all the independent windings are connected in series.

6. The tap winding configuration method for a high-current generator according to claim 4, characterized in that, The step of connecting the corresponding tap according to the determined output stage also includes: When the required output current is at its minimum, connect each of the taps so that all the independent windings are connected in parallel.

7. A high-current generator, said high-current generator comprising a three-phase transformer, characterized in that, The secondary winding of the three-phase transformer is configured with taps using the tap winding configuration method of the high current generator as described in any one of claims 1-6.

Images