Winding system and power transformer

Abstract

The invention discloses a winding system and a power transformer. The winding system comprises a winding module which comprises a plurality of windings, and each winding comprises an external connection port located at the head end and an internal connection port located at the tail end; the winding tap selection module is provided with a tap connection port, and the tap connection port is electrically connected with one of the taps of the corresponding winding; the winding connection switching module is provided with a connection switching port which is electrically connected with the external connection port and / or the internal connection port of each winding of the corresponding winding module; and the connection group switching module comprises a head end connection group switching port, a neutral point connection port, a tail end connection group switching port and connection leads, each connection lead connects two of the head end connection group switching port, the neutral point connection port and the tail end connection group switching port, and each connection lead is electrically connected to the common bus. Smooth adjustment and range expansion of the voltage are realized by changing a winding connection mode and tap selection.

Description

Technical Field

[0001] The present invention relates to the field of electricity, and particularly to an adjustable winding system. In addition, the present invention also relates to a power transformer employing the aforementioned winding system. Background Art

[0002] As a key device in the performance testing of electrical equipment, test transformers are widely used in fields such as electricity, electrical engineering, scientific research, metrology, and safety supervision. Their main function is to generate high voltage for insulation strength and withstand voltage tests on electrical equipment and lines. A test transformer includes a high-voltage winding, a low-voltage winding, insulating oil, an oil tank, high- and low-voltage bushings, a cooling system, etc. Among them, the winding is the main part of the test transformer, usually including an iron core, a high-voltage winding, and a low-voltage winding. The iron core is of a multi-column structure, and the winding is wound around the iron core to form a multi-stage coil. The voltage output range and characteristics can be changed by adjusting the winding connection method. The winding connection methods include delta connection, star connection, zigzag connection, etc., and the connection group change can be achieved between them through an electronic switch or a mechanical switch. For windings with a multi-tap design, multiple voltage values can be output simultaneously, and smooth voltage adjustment and range expansion can be achieved by changing the winding connection method and tap selection.

[0003] However, the existing winding connection methods of test transformers have the following disadvantages:

[0004] 1. The winding connection group is fixed. For example, the winding structure of a special transformer is fixed, and the connection group change can only be achieved through a mechanical switch. The disadvantage of this design is that the structure of the primary winding is fixed and the capacity is limited, and the output voltage range cannot be expanded by increasing the number of primary windings and primary winding taps.

[0005] 2. The winding connection function is single. For example, the winding connection function of some test transformers is single and only suitable for small-current tests, not for large-current tests. The disadvantage of this design is that the primary winding structure is limited by the current level and the use environment, and the output voltage range cannot be expanded by increasing the number of primary windings and primary winding taps. Summary of the Invention

[0006] This application aims to solve at least one of the technical problems in the related art to some extent.

[0007] According to one aspect of the present invention, there is provided a winding system, characterized in that the winding system includes:

[0008] A plurality of winding modules, each of the winding modules is wound around a separate core column, each of the winding modules includes a plurality of windings, and each of the windings includes an external connection port at the head end and an internal connection port at the tail end;

[0009] Multiple winding tap selection modules, with a separate winding tap selection module provided for each winding in each of the winding modules. The winding tap selection module has a tap connection port, and the tap connection port is electrically connected to one of the multiple taps of the corresponding winding;

[0010] Multiple winding connection switching modules, with a separate winding connection switching module provided for each winding module. The winding connection switching module has multiple connection switching ports, and each connection switching port is electrically connected to the external connection port and / or the internal connection port of each winding of the corresponding winding module; and

[0011] A connection group switching module, including multiple head-end connection group switching ports, multiple neutral point connection ports, multiple tail-end connection group switching ports, and multiple connection leads. A separate head-end connection group switching port, neutral point connection port, tail-end connection group switching port, and connection lead are provided for each winding module. Each head-end connection group switching port is electrically connected to the head end of one of the multiple winding modules, each tail-end connection group switching port is electrically connected to the tail end of one of the multiple winding modules, each neutral point connection port is electrically connected to the neutral point of the winding system, each connection lead connects two of the head-end connection group switching port, neutral point connection port, and tail-end connection group switching port to each other, and each connection lead is electrically connected to a common bus.

[0012] Preferably, the multiple winding modules include: a first winding module wound around a first core column. The first winding module includes a first winding and a second winding. The first winding includes a first external connection port at the head end and a first internal connection port at the tail end. The second winding includes a second external connection port at the head end and a second internal connection port at the tail end;

[0013] A second winding module wound around a second core column. The second winding module includes a third winding and a fourth winding. The third winding includes a third external connection port at the head end and a third internal connection port at the tail end. The fourth winding includes a fourth external connection port at the head end and a fourth internal connection port at the tail end; and

[0014] A third winding module wound around a third core column. The third winding module includes a fifth winding and a sixth winding. The fifth winding includes a fifth external connection port at the head end and a fifth internal connection port at the tail end. The sixth winding includes a sixth external connection port at the head end and a sixth internal connection port at the tail end.

[0015] Preferably, the multiple winding tap selection modules include:

[0016] A first winding tap selection module provided for the first winding, the first winding tap selection module having a tap connection port electrically connected to one of a plurality of taps of the first winding;

[0017] A second winding tap selection module provided for the second winding, the second winding tap selection module having a tap connection port electrically connected to one of a plurality of taps of the second winding;

[0018] A third winding tap selection module provided for the third winding, the third winding tap selection module having a tap connection port electrically connected to one of a plurality of taps of the third winding;

[0019] A fourth winding tap selection module provided for the fourth winding, the fourth winding tap selection module having a tap connection port electrically connected to one of a plurality of taps of the fourth winding;

[0020] A fifth winding tap selection module provided for the fifth winding, the fifth winding tap selection module having a tap connection port electrically connected to one of a plurality of taps of the fifth winding; and

[0021] A sixth winding tap selection module provided for the sixth winding, the sixth winding tap selection module having a tap connection port electrically connected to one of a plurality of taps of the sixth winding.

[0022] Preferably, the plurality of winding connection switching modules include: a first winding connection switching module provided for the first winding module, the first winding connection switching module having one or more first connection switching ports electrically connected to the external connection port and / or the internal connection port of the first winding of the first winding module, the first winding connection switching module having one or more second connection switching ports electrically connected to the external connection port and / or the internal connection port of the second winding of the first winding module, and the first winding connection switching module having a first winding connection switching lead for connecting at least two of the plurality of first connection switching ports and the plurality of second connection switching ports to each other;

[0023] A second winding connection switching module provided for the second winding module, the second winding connection switching module having one or more third connection switching ports electrically connected to the external connection port and / or the internal connection port of the third winding of the second winding module, and the second winding connection switching module having one or more fourth connection switching ports electrically connected to the external connection port and / or the internal connection port of the fourth winding of the second winding module, the second winding connection switching module having a second winding connection switching lead for connecting at least two of the plurality of third connection switching ports and the plurality of fourth connection switching ports to each other; and

[0024] A third winding connection switching module provided for the third winding module, the third winding connection switching module having one or more fifth connection switching ports electrically connected to the external connection port and / or the internal connection port of the fifth winding of the third winding module, and the third winding connection switching module having one or more sixth connection switching ports electrically connected to the external connection port and / or the internal connection port of the sixth winding of the third winding module, the third winding connection switching module having a third winding connection switching lead for connecting at least two of the plurality of fifth connection switching ports and the plurality of sixth connection switching ports to each other.

[0025] Preferably, the connection group switching module includes:

[0026] A first head end connection group switching port, a first neutral point connection port, a first tail end connection group switching port, and a first connection lead provided for the first winding module;

[0027] A second head end connection group switching port, a second neutral point connection port, a second tail end connection group switching port, and a second connection lead provided for the second winding module;

[0028] A third head end connection group switching port (208-B”), a third neutral point connection port, a third tail end connection group switching port, and a second connection lead provided for the third winding module,

[0029] Each of the first neutral point connection port, the second neutral point connection port, and the third neutral point connection port is connected to the neutral point of the winding system,

[0030] Each of the first connection lead, the second connection lead, and the second connection lead is connected to the common bus,

[0031] The first head-end connection group switching port is connected to the head end of the third winding module, the second head-end connection group switching port is connected to the head end of the first winding module, and the third head-end connection group switching port is connected to the head end of the second winding module.

[0032] The first tail-end connection group switching port is connected to the tail end of the first winding module, the second tail-end connection group switching port is connected to the tail end of the second winding module, and the third head-end connection group switching port is connected to the tail end of the third winding module.

[0033] Preferably, the first winding module, the second winding module, and the third winding module are connected to each other in a first connection group mode or a second connection group mode.

[0034] Preferably, in the first connection group mode, the first connection lead in the connection group switching module connects the first neutral point connection port and the first tail-end connection group switching port to each other, the second connection lead in the connection group switching module connects the second neutral point connection port and the second tail-end connection group switching port to each other, and the third connection lead in the connection group switching module connects the third neutral point connection port and the third tail-end connection group switching port to each other.

[0035] Preferably, in the second connection group mode, the first connection lead in the connection group switching module connects the first head-end connection group switching port and the first tail-end connection group switching port to each other, the second connection lead in the connection group switching module connects the second head-end connection group switching port and the second tail-end connection group switching port to each other, and the third connection lead in the connection group switching module connects the third head-end connection group switching port and the third tail-end connection group switching port to each other.

[0036] Preferably, according to another aspect of the present invention, a power transformer is provided, which includes the winding system described in any one of the foregoing items.

[0037] Preferably, the power transformer is a test transformer.

[0038] Through the technical solution of the present invention, the following technical effects are achieved: By changing the winding connection method and tap selection, smooth adjustment and range expansion of the voltage can be realized. Description of the Drawings

[0039] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0040] Figure 1 is a schematic block diagram showing a winding system according to an embodiment of the present invention.

[0041] Figure 2A , Figure 2B , Figure 2C , Figure 2D are respectively schematic diagrams of the electrical connections of a winding system according to an embodiment of the present invention.

[0042] Reference numerals:

[0043] First winding module 200

[0044] Second winding module 400

[0045] Third winding module 600

[0046] First winding A01

[0047] Second winding A02

[0048] Third winding B01

[0049] Fourth winding B02

[0050] Fifth winding C01

[0051] Sixth winding C02

[0052] First external connection port A00

[0053] Second external connection port A30

[0054] Third external connection port B00

[0055] Fourth external connection port B30

[0056] Fifth external connection port C00

[0057] Sixth external connection port C30

[0058] First internal connection port A10

[0059] Second internal connection port A20

[0060] Third internal connection port B10

[0061] Fourth internal connection port B20

[0062] Fifth internal connection port C10

[0063] Sixth internal connection port C20

[0064] First winding tap selection module 204A

[0065] Second winding tap selection module 204A'

[0066] Third winding tap selection module 204B

[0067] Fourth winding tap selection module 204B'

[0068] Fifth winding tap selection module 204C

[0069] Sixth winding tap selection module 204C'

[0070] First winding connection switching module 206A

[0071] First winding connection switching lead 206-L

[0072] Second winding connection switching module 206B

[0073] Second winding connection switching lead 206-L'

[0074] Third winding connection switching module 206C

[0075] Third winding connection switching lead 206-L”

[0076] First neutral point connection port 208-N

[0077] First terminal connection group switching port 208-X

[0078] First head end connection group switching port 208-C

[0079] First connection lead 208-L

[0080] Second neutral point connection port 208-N'

[0081] Second terminal connection group switching port 208-Y'

[0082] Second head end connection group switching port 208-A'

[0083] Second connection lead 208-L'

[0084] Third neutral point connection port 208-N”

[0085] Third terminal connection group switching port 208-Z”

[0086] Third head end connection group switching port 208-B”

[0087] Third connection lead 208-L”

[0088] Common bus 208C

[0089] Taps: O3A, O4A, O5A, O6A, O7A, O8A, U3A, U4A, U5A, U6A, U7A, U8A

[0090] O3B, O4B, O5B, O6B, O7B, O8B, U3B, U4B, U5B, U6B, U7B, U8B, O3C, O4C, O5C, O6C, O7C, O8C, U3C, U4C, U5C, U6C, U7C, U8C

[0091] Connection switching ports: A00', A00", A10', A20', A30', B00', B00", B10', B20', B30', C00', C00", C10', C20', C30' Detailed implementation manners

[0092] In order to enable those skilled in the art of this technology to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0093] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order different from those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0094] For the sake of easy understanding, the function of the high-voltage test transformer will be briefly introduced first:[[]]

[0095] The high-voltage test transformer is a special transformer dedicated to high-voltage tests on power systems, electrical equipment and electrical products. Its main function is to provide a high-voltage output during the test to test the insulation performance, withstand voltage level and electrical strength of electrical equipment. The design of the high-voltage test transformer is different from that of ordinary transformers, and it usually has the following characteristics:

[0096] High voltage output capacity: It can output high voltages ranging from several thousand volts to tens of thousands of volts, or even higher, to meet the test requirements of different electrical equipment.

[0097] High insulation level: To ensure safety under high voltages, the insulation materials and structural designs of test transformers are required to be very strict to prevent internal short circuits and external discharges.

[0098] Adjustability: Many high voltage test transformers are designed with a voltage regulation function, allowing users to adjust the output voltage within a certain range to meet different test standards and requirements.

[0099] Stability: When conducting high voltage tests, the transformer needs to provide a stable and reliable high voltage source to ensure the accuracy and consistency of test results.

[0100] Safety protection: Built-in safety measures such as overload protection and overvoltage protection can immediately cut off the power supply once abnormalities are detected, protecting the safety of the equipment and operators.

[0101] High voltage test transformers are widely used in fields such as equipment detection in power systems, factory tests of electrical products, and performance research of materials and equipment in research institutions.

[0102] Figure 1 It is a schematic block diagram showing a winding system according to an embodiment of the present invention. As Figure 1As shown, the winding system 10 includes a winding module 102, a winding tap selection module 104, a winding connection switching module 106, and a connection group switching module 108. The winding module 102 may include multiple windings, each winding wound around a separate core column, and each winding includes multiple windings, each winding including an external connection port at the head end and an internal connection port at the tail end. For each winding in each winding, a separate winding tap selection module is provided. The winding tap selection module has a tap connection port, and the tap connection port is electrically connected to one of the multiple taps of the corresponding winding. For each winding, a separate winding connection switching module is provided. The winding connection switching module has multiple connection switching ports, and each connection switching port is electrically connected to the external connection port and / or the internal connection port of each winding of the corresponding winding module. The connection group switching module 108 includes multiple head end connection group switching ports, multiple neutral point connection ports, multiple tail end connection group switching ports, and multiple connection leads. For each winding, a separate head end connection group switching port, neutral point connection port, tail end connection group switching port, and connection lead are provided. Each head end connection group switching port is electrically connected to the head end of one of the multiple windings, each tail end connection group switching port is electrically connected to the tail end of one of the multiple windings, each neutral point connection port is electrically connected to the neutral point of the winding system, each connection lead connects two of the head end connection group switching port, neutral point connection port, and tail end connection group switching port to each other, and each connection lead is electrically connected to a common bus.

[0103] Figures 2A through 2D It is a schematic diagram of the electrical connection of a winding system according to an embodiment of the present invention.

[0104] As Figure 2A shown, the winding system may include:

[0105] A first winding module 200, the first winding module is wound around a first core column. The first winding module includes a first winding A01 and a second winding A02. The first winding A01 includes a first external connection port A00 at the head end and a first internal connection port A10 at the tail end. The second winding A02 includes a second external connection port A30 at the head end and a second internal connection port A20 at the tail end. Among them, the first winding A01 may include taps O3A, O4A, O5A, O6A, O7A, O8A, and the second winding A02 may include taps U3A, U4A, U5A, U6A, U7A, U8A;

[0106] The second winding module 400 is wound around the second core column. The second winding module includes a third winding B01 and a fourth winding B02. The third winding B01 includes a third external connection port B00 at the head end and a third internal connection port B10 at the tail end. The fourth winding B02 includes a fourth external connection port B30 at the head end and a fourth internal connection port B20 at the tail end. Among them, the third winding B01 may include taps O3B, O4B, O5B, O6B, O7B, O8B, and the fourth winding B02 may include taps U3B, U4B, U5B, U6B, U7B, U8B; and

[0107] The third winding module 600 is wound around the third core column. The third winding module includes a fifth winding C01 and a sixth winding C02. The fifth winding C01 includes a fifth external connection port C00 at the head end and a fifth internal connection port C10 at the tail end. The sixth winding C02 includes a sixth external connection port C30 at the head end and a sixth internal connection port C20 at the tail end. Among them, the fifth winding C01 may include taps O3C, O4C, O5C, O6C, O7C, O8B, and the sixth winding C02 may include taps U3C, U4C, U5C, U6C, U7C, U8C.

[0108] The winding tap selection module may include:

[0109] The first winding tap selection module 204A for the first winding A01. The first winding tap selection module has a tap connection port electrically connected to one of the multiple taps of the first winding A01;

[0110] The second winding tap selection module 204A' for the second winding A02. The second winding tap selection module has a tap connection port electrically connected to one of the multiple taps of the second winding A02;

[0111] The third winding tap selection module 204B for the third winding B01. The third winding tap selection module has a tap connection port electrically connected to one of the multiple taps of the third winding B01;

[0112] The fourth winding tap selection module 204B' for the fourth winding B02. The fourth winding tap selection module has a tap connection port electrically connected to one of the multiple taps of the fourth winding B02;

[0113] The fifth winding tap selection module 204C for the fifth winding C01. The fifth winding tap selection module has a tap connection port electrically connected to one of the multiple taps of the fifth winding C01; and

[0114] A sixth winding tap selection module 204C' provided for the sixth winding C02, the sixth winding tap selection module having a tap connection port electrically connected to one of a plurality of taps of the sixth winding C02.

[0115] The winding connection switching module may include:

[0116] A first winding connection switching module 206A provided for the first winding module 200, the first winding connection switching module having two connection switching ports A00', A00'' electrically connected to the external connection port A00 of the first winding A01 of the first winding module 200, the first winding connection switching module having a connection switching port A10' electrically connected to the internal connection port A10 of the first winding A01 of the first winding module 200, the first winding connection switching module having a connection switching port A30' electrically connected to the external connection port A30 of the second winding A02 of the first winding module 200, the first winding connection switching module having a connection switching port A20' electrically connected to the internal connection port A20 of the second winding A02 of the first winding module 200, the first winding connection switching module having a first winding connection switching lead 206-L for connecting at least two of the connection switching ports A00', A00'', A20', A10', A30' to each other;

[0117] A second winding connection switching module 206B provided for the second winding module 400, the second winding connection switching module having two connection switching ports B00', B00'' electrically connected to the external connection port B00 of the third winding B01 of the second winding module 400, the second winding connection switching module 206B having a connection switching port B10' electrically connected to the internal connection port B10 of the third winding B01 of the second winding module 400, the second winding connection switching module 206B having a connection switching port B30' electrically connected to the external connection port B30 of the fourth winding B02 of the second winding module 400, the second winding connection switching module 206B having a connection switching port B20' electrically connected to the internal connection port B20 of the fourth winding B02 of the second winding module 400, the second winding connection switching module having a second winding connection switching lead 206-L' for connecting at least two of the connection switching ports B00', B00'', B20', B10', B30' to each other; and

[0118] The third winding connection switching module 206C provided for the third winding module 600 has two connection switching ports C00', C00'' electrically connected to the external connection port C00 of the fifth winding C01 of the third winding module 600. The third winding connection switching module 206C has a connection switching port C10' electrically connected to the internal connection port C10 of the fifth winding C01 of the third winding module 600. The third winding connection switching module 206C has a connection switching port C30' electrically connected to the external connection port C30 of the sixth winding C02 of the third winding module 600. The third winding connection switching module 206C has a connection switching port C20' electrically connected to the internal connection port C20 of the sixth winding C02 of the third winding module 600. The third winding connection switching module has a third winding connection switching lead 206-L'' for connecting at least two of the connection switching ports C00', C00'', C20', C10', C30' to each other.

[0119] The connection group switching module 208 may include:

[0120] A first head-end connection group switching port 208-C, a first neutral point connection port 208-N, a first terminal connection group switching port 208-X, and a first connection lead 208-L provided for the first winding module 200;

[0121] A second head-end connection group switching port 208-A', a second neutral point connection port 208-N', a second terminal connection group switching port 208-Y', and a second connection lead 208-L' provided for the second winding module 400;

[0122] A third head-end connection group switching port 208-B'', a third neutral point connection port 208-N'', a third terminal connection group switching port 208-Z'', and a second connection lead 208-L'' provided for the third winding module 600,

[0123] Each of the first neutral point connection port 208-N, the second neutral point connection port 208-N', and the third neutral point connection port 208-N'' is connected to the neutral point N of the winding system,

[0124] Each of the first connection lead 208-L, the second connection lead 208-L'', and the third connection lead 208-L' is connected to the common bus 208C,

[0125] The first head-end connection group switching port 208-C is connected to the head-end C of the third winding module. The second head-end connection group switching port 208-A' is connected to the head-end A of the first winding module. The third head-end connection group switching port 208-B'' is connected to the head-end B of the second winding module.

[0126] The first end connection group switching port 208-X is connected to the end X of the first winding module, the second end connection group switching port 208-Y' is connected to the end Y of the second winding module, and the third head end connection group switching port 208-Z” is connected to the end Z of the third winding module.

[0127] At Figure 2A , Figure 2B , Figure 2C , Figure 2D Four winding adjustment methods of the winding system are shown in:

[0128]

[0129] As Figure 2A shown, the tap connection port of each of the first winding tap selection module 204A, the second winding tap selection module 204A’, the third winding tap selection module 204B, the fourth winding tap selection module 204B’, the fifth winding tap selection module 204C, and the sixth winding tap selection module 204C’ is electrically connected to one of the multiple taps of the corresponding winding. For example, the tap of each winding is exemplified by five, so the achievable winding connection modes are: voltage transformation range 1-5. The first winding connection switching lead 206-L of the first winding connection switching module 206A electrically connects the connection switching port A00” to the connection switching port A20', and electrically connects the connection switching port A10' to the connection switching port A30', so that the first winding A01 and the second winding A02 form a parallel connection form with each other. In addition, the first connection lead 208-L connects the first neutral point connection port 208-N and the first end connection group switching port 208-X to each other. The same connection method is adopted for the second winding module 400 and the third winding module 600. Therefore, one ends of the first winding module 200, the second winding module 400, and the third winding module 600 are connected together to form a neutral point, while the other ends are respectively connected to a three-phase power supply or load, thus forming a Y connection (star connection).

[0130] As Figure 2BAs shown, the tap connection port of each of the first winding tap selection module 204A, the second winding tap selection module 204A', the third winding tap selection module 204B, the fourth winding tap selection module 204B', the fifth winding tap selection module 204C, and the sixth winding tap selection module 204C' is electrically connected to one of the multiple taps of the corresponding winding. For example, the number of taps of each winding is five, so the achievable winding connection modes are: voltage transformation range 1 - 5. The first winding connection switching lead 206-L of the first winding connection switching module 206A electrically connects the connection switching ports A00', A00", A20', and A10', so that the first winding A01 and the second winding A02 are connected in series with each other. In addition, the first connection lead 208-L connects the first neutral point connection port 208-N and the first end connection group switching port 208-X to each other. The same connection method is adopted for the second winding module 400 and the third winding module 600. Therefore, one end of the first winding module 200, the second winding module 400, and the third winding module 600 are connected together to form a neutral point (NeutralPoint), while the other ends are respectively connected to a three-phase power supply or load, thus forming a Y connection (star connection).

[0131] As Figure 2C As shown, the tap connection port of each of the first winding tap selection module 204A, the second winding tap selection module 204A', the third winding tap selection module 204B, the fourth winding tap selection module 204B', the fifth winding tap selection module 204C, and the sixth winding tap selection module 204C' is electrically connected to one of the multiple taps of the corresponding winding. For example, the number of taps of each winding is five, so the achievable winding connection modes are: voltage transformation range 1 - 5. The first winding connection switching lead 206-L of the first winding connection switching module 206A electrically connects the connection switching port A00" to the connection switching port A20', and connects the connection switching port A10' to the connection switching port A30', so that the first winding A01 and the second winding A02 are connected in parallel with each other. In addition, the first connection lead 208-L connects the first head end connection group switching port 208-C and the first end connection group switching port 208-X to each other. The same connection method is adopted for the second winding module 400 and the third winding module 600. Therefore, the first winding module 200, the second winding module 400, and the third winding module 600 form a D connection (delta connection). In the D connection, the three winding modules form a closed triangle, that is, the end of each winding module is connected to the start end of another winding module, forming a continuous loop without a neutral point.

[0132] As Figure 2DAs shown, the tap connection ports of each of the first winding tap selection module 204A, the second winding tap selection module 204A', the third winding tap selection module 204B, the fourth winding tap selection module 204B', the fifth winding tap selection module 204C, and the sixth winding tap selection module 204C' are electrically connected to one of the multiple taps of the corresponding winding. For example, the number of taps for each winding is five, so the achievable winding connection modes are: voltage transformation ranges 1 - 5. The first winding connection switching lead 206-L of the first winding connection switching module 206A electrically connects the connection switching ports A00', A00", A20', and A10', so that the first winding A01 and the second winding A02 form a series connection with each other. In addition, the first connection lead 208-L connects the first head-end connection group switching port 208-C and the first end connection group switching port 208-X to each other. The same connection method is adopted for the second winding module 400 and the third winding module 600. Therefore, the first winding module 200, the second winding module 400, and the third winding module 600 form a D connection (delta connection). In a D connection, the three winding modules form a closed triangle, that is, the end of each winding module is connected to the start of another winding module to form a continuous loop without a neutral point.

[0133] Through the technical solution of the present invention, the following technical effects are achieved: By means of flexible changes in the winding connection group and voltage regulation function, the adaptability and safety of the transformer under different test conditions are significantly improved. This design is particularly suitable for test environments that require frequent adjustment of the voltage output range and connection group, providing an efficient and safe solution for scientific research and industrial applications. Expansive content: The advantages and application benefits of the solution are not limited to the direct effects of the above technical features, but also reflected in its profound impact on the field of power tests. By improving the intelligent level of the test transformer, the design of this application can promote the progress of power test technology and facilitate the innovation and development of power equipment. For example, in the performance testing of power equipment, the voltage regulation function can precisely control the voltage output and improve the test accuracy; in the dynamic characteristic analysis of power systems, the flexible change of the winding connection can simulate different operating conditions and improve the accuracy of simulation results. Therefore, the design of this application not only solves the limitations of traditional test transformers in terms of flexibility and safety, but also provides new research directions and application possibilities for the field of power tests. Smooth voltage regulation and range expansion can be achieved by changing the winding connection method and tap selection.

[0134] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A winding system, characterized in that, The winding system includes: A plurality of winding modules (200), each winding module is wound around a separate core column, each winding module includes a plurality of windings (A01), and each winding includes an external connection port (A00) at the head end, an internal connection port (A10) at the tail end, and a plurality of taps; A plurality of winding tap selection modules (204A), a separate winding tap selection module is provided for each winding in each winding module, the winding tap selection module has a tap connection port, and the tap connection port is electrically connected to one of the plurality of taps of the corresponding winding; A plurality of winding connection switching modules (206A), a separate winding connection switching module is provided for each winding module, the winding connection switching module has a plurality of connection switching ports, and each connection switching port is electrically connected to the external connection port and / or the internal connection port of each winding of the corresponding winding module; and A connection group switching module (208), including a plurality of head end connection group switching ports, a plurality of neutral point connection ports, a plurality of tail end connection group switching ports, and a plurality of connection leads. A separate head end connection group switching port, a neutral point connection port, a tail end connection group switching port, and a connection lead are provided for each winding module. Each head end connection group switching port is electrically connected to the head end of one of the plurality of winding modules, each tail end connection group switching port is electrically connected to the tail end of one of the plurality of winding modules, each neutral point connection port is electrically connected to the neutral point (N) of the winding system, each connection lead connects two of the head end connection group switching port, the neutral point connection port, and the tail end connection group switching port to each other, and each connection lead is electrically connected to a common bus (208C).

2. The winding system according to claim 1, wherein The plurality of winding modules include: A first winding module (200), the first winding module is wound around a first core column, the first winding module includes a first winding (A01) and a second winding (A02), the first winding (A01) includes a first external connection port (A00) at the head end and a first internal connection port (A10) at the tail end, and the second winding (A02) includes a second external connection port (A30) at the head end and a second internal connection port (A20) at the tail end; A second winding module (400), the second winding module is wound around a second core column, the second winding module includes a third winding (B01) and a fourth winding (B02), the third winding (B01) includes a third external connection port (B00) at the head end and a third internal connection port (B10) at the tail end, and the fourth winding (B02) includes a fourth external connection port (B30) at the head end and a fourth internal connection port (B20) at the tail end; and The third winding module (600) is wound around the third core column. The third winding module includes a fifth winding (C01) and a sixth winding (C02). The fifth winding (C01) includes a fifth external connection port (C00) at the head end and a fifth internal connection port (C10) at the tail end. The sixth winding (C02) includes a sixth external connection port (C30) at the head end and a sixth internal connection port (C20) at the tail end.

3. The winding system according to claim 2, wherein The multiple winding tap selection modules (204A) include: A first winding tap selection module (204A) provided for the first winding (A01). The first winding tap selection module has a tap connection port electrically connected to one of the multiple taps of the first winding (A01); A second winding tap selection module (204A') provided for the second winding (A02). The second winding tap selection module has a tap connection port electrically connected to one of the multiple taps of the second winding (A02); A third winding tap selection module (204B) provided for the third winding (B01). The third winding tap selection module has a tap connection port electrically connected to one of the multiple taps of the third winding (B01); A fourth winding tap selection module (204B') provided for the fourth winding (B02). The fourth winding tap selection module has a tap connection port electrically connected to one of the multiple taps of the fourth winding (B02); A fifth winding tap selection module (204C) provided for the fifth winding (C01). The fifth winding tap selection module has a tap connection port electrically connected to one of the multiple taps of the fifth winding (C01); and A sixth winding tap selection module (204C') provided for the sixth winding (C02). The sixth winding tap selection module has a tap connection port electrically connected to one of the multiple taps of the sixth winding (C02).

4. The winding system according to claim 3, wherein The multiple winding connection switching modules include: A first winding connection switching module (206A) provided for the first winding module. The first winding connection switching module has one or more first connection switching ports (A00') electrically connected to the external connection port and / or the internal connection port of the first winding (A01) of the first winding module. The first winding connection switching module has one or more second connection switching ports (A20') electrically connected to the external connection port and / or the internal connection port of the second winding (A02) of the first winding module. The first winding connection switching module has a first winding connection switching lead (206-L) that connects at least two of the multiple first connection switching ports and the multiple second connection switching ports to each other; A second winding connection switching module (206B) provided for the second winding module, the second winding connection switching module having one or more third connection switching ports (B00') electrically connected to the external connection port and / or the internal connection port of the third winding (B01) of the second winding module, and the second winding connection switching module having one or more fourth connection switching ports (B20') electrically connected to the external connection port and / or the internal connection port of the fourth winding (B02) of the second winding module, the second winding connection switching module having a second winding connection switching lead (206-L') that connects at least two of the plurality of third connection switching ports and the plurality of fourth connection switching ports to each other; and A third winding connection switching module (206C) provided for the third winding module, the third winding connection switching module having one or more fifth connection switching ports (C00') electrically connected to the external connection port and / or the internal connection port of the fifth winding (C01) of the third winding module, and the third winding connection switching module having one or more sixth connection switching ports (C20') electrically connected to the external connection port and / or the internal connection port of the sixth winding (C02) of the third winding module, the third winding connection switching module having a third winding connection switching lead (206-L") that connects at least two of the plurality of fifth connection switching ports and the plurality of sixth connection switching ports to each other.

5. The winding system according to claim 4, wherein The connection group switching module (208) includes: A first head connection group switching port (208-C), a first neutral point connection port (208-N), a first end connection group switching port (208-X), and a first connection lead (208-L) provided for the first winding module; A second head connection group switching port (208-A'), a second neutral point connection port (208-N'), a second end connection group switching port (208-Y'), and a second connection lead (208-L') provided for the second winding module; A third head connection group switching port (208-B"), a third neutral point connection port (208-N"), a third end connection group switching port (208-Z"), and a third connection lead (208-L") provided for the third winding module, Each of the first neutral point connection port, the second neutral point connection port, and the third neutral point connection port is connected to the neutral point of the winding system, Each of the first connection lead, the second connection lead, and the second connection lead is connected to the common bus, The first head connection group switching port is connected to the head (C) of the third winding module, the second head connection group switching port is connected to the head (A) of the first winding module, and the third head connection group switching port is connected to the head (B) of the second winding module, The first terminal connection group switching port is connected to the terminal (X) of the first winding module, the second terminal connection group switching port is connected to the terminal (Y) of the second winding module, and the third head connection group switching port is connected to the terminal (Z) of the third winding module.

6. The winding system according to claim 5, wherein The first winding module (200), the second winding module (400), and the third winding module (600) are connected to each other in a first connection group mode or a second connection group mode. In the first connection group mode, the first winding module (200), the second winding module (400), and the third winding module (600) form a star connection. In the second connection group mode, the first winding module (200), the second winding module (400), and the third winding module (600) form a delta connection.

7. The winding system according to claim 6, wherein In the first connection group mode, the first connection lead in the connection group switching module connects the first neutral point connection port and the first terminal connection group switching port to each other, the second connection lead in the connection group switching module connects the second neutral point connection port and the second terminal connection group switching port to each other, and the third connection lead in the connection group switching module connects the third neutral point connection port and the third terminal connection group switching port to each other.

8. The winding system according to claim 6, wherein In the second connection group mode, the first connection lead in the connection group switching module connects the first head connection group switching port and the first terminal connection group switching port to each other, the second connection lead in the connection group switching module connects the second head connection group switching port and the second terminal connection group switching port to each other, and the third connection lead in the connection group switching module connects the third head connection group switching port and the third terminal connection group switching port to each other.

9. A power transformer, characterized in that, Comprising the winding system according to any one of claims 1 to 8.

10. The power transformer according to claim 9, characterized in that, The power transformer is a test transformer.

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