阅读说明：本技术 一种大电流发生器的分接头绕组配置方法及大电流发生器 (Configuration method of tap winding of large-current generator and large-current generator ) 是由 刘智勇 张耿斌 李艳飞 张滔 周靖钧 刘珮瑶 李昭红 蒋兴良 吴达 邓茂村 吕泽 于 2021-10-15 设计创作，主要内容包括：本发明涉及大电流发生器技术领域,公开了一种大电流发生器的分接头绕组配置方法。本发明方法通过输出电流的输出级数量阈值来确定三相变压器二次侧的绕组划分,并在所分的独立绕组的两侧安装分接头,进而根据所需输出电流来调节各所述分接头的连接方式；本发明实现了多绕组分流,可以减小绕组的设计线径以减轻绕组重量,分接头的配置使得能够通过调整分接头的连接方式来调节大电流发生器的输出电流,解决了现有大电流发生器适应性与灵活性差的技术问题。(The invention relates to the technical field of large-current generators and discloses a configuration method of a tap winding of a large-current generator. The method determines the winding division of the secondary side of the three-phase transformer through the output stage quantity threshold of the output current, and the taps are arranged on the two sides of the divided independent windings, so that the connection mode of each tap is adjusted according to the required output current; the invention realizes multi-winding shunt, can reduce the designed wire diameter of the winding to lighten 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, thereby solving the technical problem that the existing large current generator has poor adaptability and flexibility.)

1. A method of configuring a tap winding for a high current generator, comprising:

determining the total number of turns of a winding on the secondary side of a three-phase transformer in a large-current generator;

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

installing taps at both sides of each of the independent windings;

and adjusting the connection mode of each tap according to the required output current.

2. The tap winding configuration method for a high current generator of claim 1, wherein said determining the total number of winding turns on the secondary side of the three-phase transformer in the high current generator comprises:

determining the minimum magnetic flux density and the cross-sectional area of an iron core of the three-phase transformer;

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

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

3. The tap winding arrangement method for a high current generator according to claim 2, wherein the secondary side turn electromotive force is calculated according to the following formula:

e_t＝4.44fBA

wherein 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 sectional area of the iron core.

4. The tap winding configuration method for a high current generator of claim 2, wherein the total number of winding turns is calculated according to the following formula:

wherein N represents the total number of turns of the winding, U represents the power supply voltage, k represents the rated transformation ratio, e_tRepresenting the secondary side turn emf.

5. The method for tap winding configuration of a high current generator according to claim 4, further comprising:

if the N is not an integer, re-determining the total number of turns of the winding on the secondary side of the three-phase transformer to be int (N) +1, int (N), and representing to carry out rounding on the N.

6. The method for tap winding configuration of a high current generator according to claim 5, further comprising:

and if the N is not an integer, correspondingly replacing the iron core of the three-phase transformer according to the redetermined total number of turns of the winding.

7. The method for configuring the tap winding of the high current generator as claimed in claim 1, wherein said adjusting the connection manner of each of the taps according to the required output current comprises:

determining an output stage of the output current according to the required output current;

the corresponding tap is connected according to the determined output stage.

8. The tap winding configuration method of claim 7, wherein said connecting the corresponding taps according to the determined output stage comprises:

each of the taps is connected such that all of the independent windings are connected in series when the required output current is at a maximum.

9. The tap winding configuration method for a high current generator according to claim 7, wherein said connecting the corresponding tap according to the determined output stage further comprises:

when the required output current is at a minimum, each of the taps is connected such that all of the independent windings are connected in parallel.

10. A large current generator comprising a three-phase transformer, wherein secondary windings of said three-phase transformer are tapped by the tap winding arrangement method of the large current generator as claimed in any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of large-current generators, in particular to a configuration method of a tap winding of a large-current generator and the large-current generator.

Background

The current commonly adopted large current generator does not have the function of output current regulation, and energy loss caused by overlarge output current or the situation that the output current is too small to meet the application requirement can be caused during actual use; and the design wire diameter of the secondary side winding of the transformer of the large current generator is overlarge, so that the weight of the winding is overlarge.

The above disadvantages greatly limit the adaptability and flexibility of current large current generators.

Disclosure of Invention

The invention provides a tap winding configuration method of a large-current generator and the large-current generator, and solves the technical problem that the existing large-current generator is poor in adaptability and flexibility.

The present invention provides, in a first aspect, a method for configuring a tap winding of a high current generator, including:

determining the total number of turns of a winding on the secondary side of a three-phase transformer in a large-current generator;

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

installing taps at both sides of each of the independent windings;

and adjusting the connection mode of each tap according to the required output current.

According to a manner that can be realized by the first aspect of the present invention, the determining the total number of winding turns on the secondary side of the three-phase transformer in the high-current generator includes:

determining the minimum magnetic flux density and the cross-sectional area of an iron core of the three-phase transformer;

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

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

According to one possible implementation of the first aspect of the present invention, the secondary side turn electromotive force is calculated according to the following formula:

e_t＝4.44fBA

wherein 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 sectional area of the iron core.

According to one possible implementation of the first aspect of the invention, the total number of winding turns is calculated as follows:

wherein N represents the total number of turns of the winding, U represents the power supply voltage, k represents the rated transformation ratio, e_tTo representSecondary side turn electromotive force.

According to an enabling aspect of the first aspect of the invention, the method further comprises:

if the N is not an integer, re-determining the total number of turns of the winding on the secondary side of the three-phase transformer to be int (N) +1, int (N), and representing to carry out rounding on the N.

According to an enabling aspect of the first aspect of the invention, the method further comprises:

and if the N is not an integer, correspondingly replacing the iron core of the three-phase transformer according to the redetermined total number of turns of the winding.

According to a possible implementation manner of the first aspect of the present invention, the adjusting the connection manner of each of the taps according to the required output current includes:

determining an output stage of the output current according to the required output current;

the corresponding tap is connected according to the determined output stage.

According to a possible implementation form of the first aspect of the invention, the connecting the corresponding tap according to the determined output stage comprises:

each of the taps is connected such that all of the independent windings are connected in series when the required output current is at a maximum.

According to a possible implementation manner of the first aspect of the present invention, the connecting the corresponding tap according to the determined output stage further comprises:

when the required output current is at a minimum, each of the taps is connected such that all of the independent windings are connected in parallel.

A second aspect of the present invention provides a large current generator including a three-phase transformer whose secondary side windings are configured with taps using the tap winding configuration method of the large current generator as described in any one of the above embodiments.

According to the technical scheme, the invention has the following advantages:

according to the embodiment of the invention, the winding division of the secondary side of the three-phase transformer is determined through the output stage number threshold of the output current, the taps are arranged on two sides of the divided independent windings, and the connection mode of each tap is adjusted according to the required output current; the invention realizes multi-winding shunt, can reduce the designed wire diameter of the winding to lighten the weight of the winding, and the configuration of the tap enables the output current of the heavy current generator to be adjusted by adjusting the connection mode of the tap, thereby solving the technical problem of poor adaptability and flexibility of the existing heavy current generator, being beneficial to reducing the loss of the transformer, prolonging the service life and improving the use efficiency and the economical efficiency, thereby being better applied to various fields of a power system, ensuring the safe and stable operation of the whole power system and reducing the economic loss and social influence caused by disaster shutdown of the power system.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a flow chart of a method of configuring a tap winding of a high current generator according to an alternative embodiment of the present invention;

fig. 2 is a schematic diagram of a tap-mounted winding according to an alternative embodiment of the present invention.

Detailed Description

The embodiment of the invention provides a tap winding configuration method of a large-current generator and the large-current generator, which are used for solving the technical problem that the existing large-current generator is poor in adaptability and flexibility.

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, fig. 1 is a flowchart illustrating a method for configuring a tap winding of a high current generator according to an embodiment of the present invention.

The invention provides a method for configuring a tap winding of a high-current generator, which comprises the following steps:

s1 determines the total number of winding turns on the secondary side of the three-phase transformer in the high current generator.

In one implementation, the determining total number of winding turns on the secondary side of the three-phase transformer in the high-current generator includes:

determining the minimum magnetic flux density and the cross-sectional area of an iron core of the three-phase transformer;

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

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

Wherein, for small transformers, the cross-section of the iron core is usually rectangular or square, and for large transformers, the cross-section of the iron core is usually stepped to fully utilize the space. When selecting the core material, the structure and size of the core material may be determined according to the space available for winding of the three-phase transformer.

Further, when the three-phase transformer is configured with windings, a concentric coaxial inner-outer double-layer winding or coaxial upper-lower single-layer winding mode of the secondary side winding can be selected according to the structural size of the iron core.

In one implementation, the secondary side turn emf is calculated as:

e_t＝4.44fBA

wherein 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 sectional area of the iron core.

In one possible implementation, the total number of winding turns is calculated as follows:

wherein N represents the total number of turns of the winding, U represents the power supply voltage, k represents the rated transformation ratio, e_tRepresenting the secondary side turn emf.

According to the embodiment of the invention, the total number of turns of the winding is determined in the above manner, and the method is simple and convenient.

In one implementation, the method further comprises:

if the N is not an integer, re-determining the total number of turns of the winding on the secondary side of the three-phase transformer to be int (N) +1, int (N), and representing to carry out rounding on the N.

In consideration of the case where the calculated total number of winding turns is not an integer, the embodiment of the present invention takes an integer greater than N as the value of the total number of winding turns.

In one implementation, the method further comprises:

and if the N is not an integer, correspondingly replacing the iron core of the three-phase transformer according to the redetermined total number of turns of the winding so as to change the value of the minimum magnetic flux density and/or the sectional area.

S2, determining the number of independent windings on the secondary side of the three-phase transformer according to the threshold value of the number of output stages of the output current, wherein the number of winding turns of each independent winding is equal to the total number of winding turns divided by the threshold value of the number of output stages.

The threshold value of the output stage quantity can be set according to actual needs. The output stage is commonly referred to as a "gear". When the current applied to the rated load needs to have a plurality of output stages and each adjacent output stage meets the relation of increasing the equal difference, the output voltage of the transformer also correspondingly meets the relation of the equal difference and the multiple output stages.

The number of independent windings on the secondary side of the three-phase transformer is greater than or equal to the output stage number threshold of the output current. Preferably, the number of independent windings on the secondary side of the three-phase transformer is equal to the threshold value of the number of output stages of the output current.

For example, if M outputs of the current of the large current generator are required, the threshold value of the number of output stages is set to be M, and accordingly, the number of independent windings on the secondary side of the three-phase transformer is determined to be M.

S3 mounting taps on both sides of each of the independent windings.

As shown in fig. 2, 6 independent windings are provided, each of which connects 2 taps, respectively "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".

S4 adjusting the connection mode of each of the taps according to the required output current.

Due to the fact that the independent windings are arranged, a plurality of different current outputs, namely a plurality of output stages, can be achieved according to different tap connection modes.

In one implementation, the adjusting the connection mode of each of the taps according to the required output current includes:

determining an output stage of the output current according to the required output current;

the corresponding tap is connected according to the determined output stage.

When the required output current is the maximum value, i.e. the output stage is regulated to be the maximum value, it is necessary to connect each of the taps so that all the independent windings are connected in series. When the required output current is at a minimum, i.e. the output stage is to be regulated to a minimum, each of said taps is connected such that all of said separate windings are connected in parallel.

For the same load, the output current of other output stages can be realized by adjusting the connection mode of each tap.

For example, when the number of the independent windings is 6, the current of the first output stage can be obtained as the maximum output current by adjusting the connection mode of each tap and connecting the 6 independent windings in series; 5 windings are connected in series, 1 winding is abandoned, and the current of the second output stage can be obtained, and the value of the current is 5/6 of the first output stage; 4 windings are connected in series, 2 windings are abandoned, and the current of the third output stage can be obtained, and the value of the current is 2/3 of the first output stage; connecting 3 windings in series to form 2 groups, and then connecting the groups in parallel to obtain the current of the fourth output stage, wherein the value of the current is 1/2 of the first output stage; 2 windings are connected in series to form 3 groups, and then the groups are connected in parallel, so that the current of a fifth output stage can be obtained, and the value of the current is 1/3 of the first output stage; by connecting all 6 windings in parallel, the current of the sixth output stage is obtained, which has a value of 1/6 for the first output stage.

In one implementation, after adjusting the connection mode of each of the taps according to the required output current, the method further includes:

and connecting the output end of the three-phase transformer into a three-phase rectifying circuit, and outputting the rectified three-phase transformer to a load.

The invention also provides a large current generator, which comprises a three-phase transformer, wherein the secondary side winding of the three-phase transformer is provided with a tap by adopting the tap winding configuration method of the large current generator in any one of the embodiments.

According to the embodiment of the invention, multi-winding shunt is realized, the designed wire diameter of the winding can be reduced to reduce the weight of the winding, 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, the technical problem that the existing large current generator is poor in adaptability and flexibility is solved, the transformer loss is reduced, the service life is prolonged, the use efficiency and the economical efficiency are improved, and therefore, the transformer is better applied to various fields of a power system, the safe and stable operation of the whole power system is ensured, and the economic loss and social influence caused by disaster shutdown of the power system are reduced.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.