CN217306292U - Combined three-phase transformer - Google Patents

Abstract

The utility model provides a modular three-phase transformer, its first iron core of first single-phase transformer, the second iron core of second single-phase transformer is the same with the third iron core structure of third single-phase transformer, and 120 degrees ground rotational symmetry arrange each other around the longitudinal central axis of modular three-phase transformer, make the first plane of first iron core, the second plane of second iron core and the third plane of third iron core intersect each other to become 60 degrees ground and enclose into positive triangular prism shape as three side, wherein, first iron core, every in second iron core and the third iron core is located the corresponding one in the three side of positive triangular prism shape, and the iron core post of first iron core, second iron core and third iron core is all oriented into being on a parallel with longitudinal central axis. According to the utility model discloses a combination formula three-phase transformer has improved occupation space, can adapt to the confined space that has roughly the same extension along two horizontal directions of mutually perpendicular.

Description

Combined three-phase transformer

Technical Field

The utility model relates to a power transformer field, especially a modular three-phase transformer.

Background

Three-phase transformers are the main electrical devices in an electrical power network, which are used for transforming, in particular raising and lowering, an alternating voltage.

The existing three-phase transformer generally includes a three-phase three-limb type or three-phase five-limb type iron core and a three-phase winding wound on the iron core. Such a core is elongated, so that the three-phase transformer has a "I" profile. Such a "straight" profile is relatively elongated in one horizontal direction and relatively short in another horizontal direction perpendicular to the one horizontal direction within the same horizontal plane. This results in that the existing three-phase transformers are not suitable for being arranged in confined spaces having substantially the same extension in two horizontal directions perpendicular to each other, in particular in the tower or nacelle space of a wind power tower.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides a novel combined three-phase transformer for providing a three-phase transformer having an improved occupied space so as to accommodate a limited space having substantially the same extension along two horizontal directions perpendicular to each other.

On the one hand, the utility model provides a modular three-phase transformer, a serial communication port, modular three-phase transformer has longitudinal center to the line includes:

a first single-phase transformer including a first core of dual limb type defining a first plane, a core leg and a yoke of the first core each lying in the first plane;

a second single-phase transformer disposed adjacent to the first single-phase transformer, the second single-phase transformer including a dual-limb second core defining a second plane, the core limb and the yoke of the second core both lying in the second plane; and

a third single-phase transformer disposed adjacent to the first single-phase transformer and the second single-phase transformer, the third single-phase transformer including a double-limb third core defining a third plane, the core limb and the yoke of the third core both lying in the third plane;

the first, second and third cores are identical in structure and are rotationally symmetrically arranged about the longitudinal center axis at 120 degrees from each other such that the first, second and third planes intersect each other at 60 degrees and enclose as three sides a right triangular prism shape, wherein each of the first, second and third cores is located within a respective one of the three sides of the right triangular prism shape and the core legs of the first, second and third cores are each oriented parallel to the longitudinal center axis;

the modular three-phase transformer also includes an electrical connection assembly electrically connecting the first, second, and third single-phase transformers together to form a three-phase transformer.

According to an embodiment of the present invention, the first single-phase transformer includes a first low-voltage winding and a first high-voltage winding, the first low-voltage winding includes a first low-voltage coil and a second low-voltage coil respectively arranged around an iron core column of the first iron core, the first high-voltage winding includes a first high-voltage coil and a second high-voltage coil respectively arranged around the first low-voltage coil and the second low-voltage coil, the first high-voltage coil includes a first high-voltage incoming end and a first high-voltage outgoing end led out from the first high-voltage coil, and the second high-voltage coil includes a second high-voltage incoming end and a second high-voltage outgoing end led out from the second high-voltage coil; the second single-phase transformer comprises a second low-voltage winding and a second high-voltage winding, the second low-voltage winding comprises a third low-voltage coil and a fourth low-voltage coil which are respectively arranged around an iron core column of the second iron core, the second high-voltage winding comprises a third high-voltage coil and a fourth high-voltage coil which are respectively arranged around the third low-voltage coil and the fourth low-voltage coil, the third high-voltage coil comprises a third high-voltage wire inlet end and a third high-voltage wire outlet end which are led out from the third high-voltage coil, and the fourth high-voltage coil comprises a fourth high-voltage wire inlet end and a fourth high-voltage wire outlet end which are led out from the fourth high-voltage coil; and the third single-phase transformer includes a third low-voltage winding and a third high-voltage winding, the third low-voltage winding includes a fifth low-voltage coil and a sixth low-voltage coil respectively arranged around an iron core column of the third iron core, the third high-voltage winding includes a fifth high-voltage coil and a sixth high-voltage coil respectively arranged around the fifth low-voltage coil and the sixth low-voltage coil, the fifth high-voltage coil includes a fifth high-voltage incoming end and a fifth high-voltage outgoing end led out from the fifth high-voltage coil, and the sixth high-voltage coil includes a sixth high-voltage incoming end and a sixth high-voltage outgoing end led out from the sixth high-voltage coil; wherein the first single-phase transformer, the second single-phase transformer and the third single-phase transformer enclose a first space around the longitudinal center axis, and each of the first high-voltage wire inlet end, the first high-voltage wire outlet end, the second high-voltage wire inlet end, the second high-voltage wire outlet end, the third high-voltage wire inlet end, the third high-voltage wire outlet end, the fourth high-voltage wire inlet end, the fourth high-voltage wire outlet end, the fifth high-voltage wire inlet end, the fifth high-voltage wire outlet end, the sixth high-voltage wire inlet end, and the sixth high-voltage wire outlet end is led out into the first space from a portion of a corresponding one of the first high-voltage coil, the second high-voltage coil, the third high-voltage coil, the fourth high-voltage coil, the fifth high-voltage coil, and the sixth high-voltage coil, which faces the first space.

According to an embodiment of the present invention, the first high voltage incoming line end and the first high voltage outgoing line end are spaced apart in a direction parallel to the longitudinal central axis and aligned with each other; the second high voltage inlet end and the second high voltage outlet end are spaced apart in a direction parallel to the longitudinal central axis and are aligned with each other; the third high pressure inlet wire end and the third high pressure outlet wire end are spaced apart and aligned with each other in a direction parallel to the longitudinal central axis; the fourth high voltage inlet end and the fourth high voltage outlet end are spaced apart in a direction parallel to the longitudinal central axis and are aligned with each other; the fifth high voltage inlet end and the fifth high voltage outlet end are spaced apart and aligned with each other in a direction parallel to the longitudinal central axis; and the sixth high voltage inlet end and the sixth high voltage outlet end are spaced apart and aligned with each other in a direction parallel to the longitudinal central axis.

According to the utility model discloses an embodiment, first high pressure inlet wire end the high pressure inlet wire end of second the high pressure inlet wire end of third high pressure inlet wire end the high pressure inlet wire end of fourth fifth high pressure inlet wire end with the high pressure inlet wire end of sixth winds vertical central axis separates 60 degrees ground rotational symmetry each other and arranges, and first high pressure outlet wire end the high pressure outlet wire end of second the high pressure outlet wire end of third high pressure outlet wire end the high pressure outlet wire end of fourth fifth high pressure outlet wire end with the high pressure outlet wire end of sixth winds vertical central axis separates 60 degrees ground rotational symmetry each other and arranges.

According to an embodiment of the utility model, combination formula three-phase transformer is step up transformer, first high-voltage coil is close to sixth high-voltage coil, second high-voltage coil is close to third high-voltage coil, and fourth high-voltage coil is close to fifth high-voltage coil, electric connection component includes high-pressure side electric connection component, high-pressure side electric connection component will first high-pressure inlet wire end with second high-pressure inlet wire end, third high-pressure inlet wire end with fourth high-pressure inlet wire end, fifth high-pressure inlet wire end with sixth high-pressure inlet wire end, first high-pressure leading-out terminal with sixth high-pressure leading-out terminal, second high-pressure leading-out terminal with third high-pressure inlet wire end, fourth high-pressure leading-out terminal with fifth high-pressure leading-out terminal electricity is connected, thereby will first high-voltage coil with second high-voltage coil, The third high-voltage coil and the fourth high-voltage coil, and the fifth high-voltage coil and the sixth high-voltage coil are connected in series, and the first high-voltage winding, the second high-voltage winding, and the third high-voltage winding are electrically connected in a delta connection manner.

According to an embodiment of the utility model, first single phase transformer second single phase transformer with third single phase transformer is resin type dry-type single phase transformer, first high voltage coil second high voltage coil third high voltage coil fourth high voltage coil fifth high voltage coil with every in the sixth high voltage coil is by the resin cladding and be formed with and outstanding to resin boss in the first space, first high voltage inlet wire end, first high voltage outlet terminal, second high voltage inlet wire end, second high voltage outlet terminal, third high voltage inlet wire end, third high voltage outlet wire end, fourth high voltage inlet wire end, fourth high voltage outlet wire end, fifth high voltage inlet wire end, fifth high voltage outlet wire end, sixth high voltage inlet wire end with every in the sixth high voltage outlet wire end is followed first high voltage coil, A respective one of the second high-voltage coil, the third high-voltage coil, the fourth high-voltage coil, the fifth high-voltage coil, and the sixth high-voltage coil is led out into the first space through a respective one of the resin bosses.

According to an embodiment of the present invention, the electric connection component includes a low voltage side electric connection component, the low voltage side electric connection component will first low voltage coil with second low voltage coil third low voltage coil with fourth low voltage coil fifth low voltage coil with sixth low voltage coil parallel connection, and first single phase transformer second single phase transformer with the top of third single phase transformer round first space extends and connects with star connection's mode electricity first low voltage winding second low voltage winding with third low voltage winding.

According to the utility model discloses an embodiment, first low pressure coil the second low pressure coil third low pressure coil fourth low pressure coil fifth low pressure coil with low pressure inlet wire end and the low pressure outlet terminal of every in the sixth low pressure coil are all followed first low pressure coil second low pressure coil third low pressure coil fourth low pressure coil fifth low pressure coil with corresponding low pressure coil in the sixth low pressure coil is drawn forth corresponding low pressure coil's top to be qualified for the next round of competitions on inlet wire and the low pressure in the realization low pressure.

According to the utility model discloses an embodiment, combination formula three-phase transformer still includes insulating board subassembly, insulating board subassembly will first high tension coil the second high tension coil the third high tension coil the fourth high tension coil the fifth high tension coil with in the sixth high tension coil every to two adjacent high tension coils separate and every to provide between two adjacent high tension coils and strengthen insulating.

According to the utility model discloses an embodiment, first single phase transformer second single phase transformer with third single phase transformer structure is the same.

It can be seen from the above-mentioned scheme that according to the utility model discloses a combination formula three-phase transformer has improved occupation space, can adapt to the restricted space that has roughly the same extension along two horizontal directions of mutually perpendicular.

Drawings

The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail preferred embodiments thereof with reference to the attached drawings, in which:

fig. 1 is a perspective view of one version of a modular three-phase transformer according to the present invention.

Fig. 2 is another perspective view of the combined three-phase transformer shown in fig. 1, viewed from a different angle than fig. 1.

Fig. 3 is a further perspective view of the combined three-phase transformer shown in fig. 1, viewed from a different angle than fig. 1.

Fig. 4 is a front view of the combined three-phase transformer shown in fig. 1.

Fig. 5 is a top view of the combined three-phase transformer shown in fig. 1.

Fig. 6 is a left side view of the combined three-phase transformer shown in fig. 1.

Fig. 7 is a right side view of the combined three-phase transformer shown in fig. 1.

Fig. 8 is a rear view of the combined three-phase transformer shown in fig. 1.

Fig. 9 is a cross-sectional view of the combined three-phase transformer shown in fig. 1 along line I-I of fig. 4.

Fig. 10 is a cross-sectional view of the combined three-phase transformer shown in fig. 1 along line II-II of fig. 4.

Fig. 11 is a perspective view of cores of a single-phase transformer of the combined three-phase transformer shown in fig. 1.

Fig. 12 is a perspective view of another version of a modular three-phase transformer according to the present invention.

Wherein the reference numbers are as follows:

1 combined three-phase transformer 3 longitudinal central axis 100 first single-phase transformer

101 first core leg 101b second core leg

101c first yoke 101d second yoke 103 first plane

104 first clamping assembly 104a, an upper clamping member 104b, and a lower clamping member

105 first low-voltage coil 105a first low-voltage coil incoming terminal 105b first low-voltage coil outgoing terminal

107 second low-voltage coil 107a second low-voltage coil inlet end 107b second low-voltage coil outlet end

109 first high-voltage coil 109a first high-voltage wire inlet end 109b first high-voltage wire outlet end

111 second high-voltage coil 111a second high-voltage wire inlet end 111b second high-voltage wire outlet end

200 second single-phase transformer 201 second iron core 203 second plane

204 second clamping assembly 205 third low voltage coil 205a third low voltage coil incoming terminal

205b third low voltage coil outlet terminal 207 fourth low voltage coil inlet terminal 207a fourth low voltage coil outlet terminal

207b fourth low-voltage winding outlet terminal 209, third high-voltage winding 209a third high-voltage inlet terminal

209b third high voltage line outlet end 211 fourth high voltage coil 211a fourth high voltage line inlet end

211b fourth high-voltage outlet terminal 300, third single-phase transformer 301 and third core

303 third plane 304 third clamping assembly 305 fifth low voltage coil

305a fifth low voltage coil inlet terminal 305b a fifth low voltage coil outlet terminal 307a sixth low voltage coil

307a sixth low voltage winding inlet terminal 307b sixth low voltage winding outlet terminal 309 fifth high voltage winding

309a fifth high voltage inlet terminal 309b fifth high voltage outlet terminal 311 sixth high voltage winding

311a sixth high voltage inlet terminal 311b sixth high voltage outlet terminal 400 electrical connection assembly

401 high voltage side electric connection assembly 403a low voltage coil incoming line connector 403b low voltage coil outgoing line connector

500 resin boss 600a-600f insulating board 700a-700b fastener

S first space

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail by referring to the following embodiments.

It will be understood by those skilled in the art that these examples are illustrative only and are not meant to form any limitation on the present invention. Furthermore, features in the embodiments of the present invention may be combined with each other without conflict. In the drawings, other components have been omitted for the sake of brevity, but this does not indicate that the combined three-phase and single-phase transformer of the invention may not include other structures and components. It is to be understood that the size, proportion and number of elements of each structure and component illustrated in the drawings are not to be considered limiting.

Fig. 1 to 10 schematically show a version of a combined three-phase transformer 1 according to the invention. Fig. 1 is a perspective view of a combined three-phase transformer 1, fig. 2 is another perspective view of the combined three-phase transformer 1 as seen from a different angle than fig. 1, fig. 3 is yet another perspective view of the combined three-phase transformer 1 as seen from a different angle than fig. 1, fig. 4 to 8 are respectively a front view, a top view, a left view, a right view, and a rear view of the combined three-phase transformer 1, and fig. 9 and 10 are respectively cross-sectional views of the combined three-phase transformer 1 along line I-I and line II-II of fig. 4. As shown in fig. 1 to 10, the combined three-phase transformer 1 includes three single-phase transformers: a first single-phase transformer 100, a second single-phase transformer 200, and a third single-phase transformer 300. Each of the first, second, and third single- phase transformers 100, 200, and 300 has a capacity that is one-third of that of the combined three-phase transformer 1. The first single-phase transformer 100, the second single-phase transformer 200, and the third single-phase transformer 300 are arranged adjacent to each other. That is, the second single-phase transformer 200 is disposed adjacent to the first single-phase transformer 100, and the third single-phase transformer 300 is disposed adjacent to the first single-phase transformer 100 and the second single-phase transformer 200. The first single-phase transformer 100 includes a first core 101 of a double limb type, the second single-phase transformer 200 includes a second core 201 of a double limb type, and the third single-phase transformer 300 includes a third core 301 of a double limb type. The first core 101, the second core 201 and the third core 301 have the same structure. Further reference is made to fig. 11, which schematically shows a first core 101 of a first single-phase transformer 100 of the combined three-phase transformer 1. As shown in fig. 11, the first core leg 101 is of a double column type and includes a first core leg 101a, a second core leg 101b extending parallel to the first core leg 101a and spaced apart from the first core leg 101a, a first yoke 101c extending perpendicular to the first and second core legs 101a and 101b and connecting a first end of the first core leg 101a and a first end of the second core leg 101b, and a second yoke 101d extending parallel to the first yoke 101c and spaced apart from the first yoke 101c and connecting a second end opposite to the first end of the first core leg 101a and a second end opposite to the first end of the second core leg 101 b. In this way, the magnetic path of the first core 101 can be formed. As is well known in the art, for a single-phase double limb core, the limb and the yoke lie in the same plane. That is, the core limb and the yoke of the single-phase double limb core are substantially coplanar. Therefore, for the first core 101 of the first single-phase transformer 100, the first leg 101a, the second leg 101b, the first yoke 101c, and the second yoke 101d are all in the same plane. In other words, the first core leg 101 defines a first plane 103 (as indicated by the dashed lines in fig. 5), and the first core leg 101a, the second core leg 101b, the first yoke 101c, and the second yoke 101d are all within the first plane 103. As described above, the second core 201 of the second single-phase transformer 200 and the third core 301 of the third single-phase transformer 300 have the same structure as the first core 101 of the first single-phase transformer 100. Similarly, the second core 201 defines a second plane 203 (as indicated by the dashed line in fig. 5), and both the core limb and the yoke (not specifically labeled in the figure) of the second core 201 are located in the second plane 203; the third core 301 defines a third plane 303 (as indicated by the dashed lines in fig. 5), and the core leg and the yoke (not specifically identified in the figures) of the third core 301 are located in the third plane 303.

Referring back to fig. 4 and 5, the combined three-phase transformer 1 has a longitudinal central axis 3, and the first, second and third cores 101, 201, 301 are rotationally symmetrically arranged at 120 degrees from each other around the longitudinal central axis 3 of the combined three-phase transformer 1 such that the first, second and third planes 103, 203, 303 intersect each other at 60 degrees and enclose as three sides a right triangular prism (as schematically indicated by the dashed lines in fig. 5), wherein each of the first, second and third cores 101, 201, 301 is located within a respective one of the three sides of the right triangular prism, and the core legs of the first, second and third cores 101, 201, 301 are each oriented parallel to the longitudinal central axis 3. It will be understood that in this case the longitudinal centre axis of the right triangular prism coincides with the longitudinal centre axis 3 of the combined three-phase transformer 1.

As shown in fig. 1 to 10, the combined type three-phase transformer 1 further includes an electrical connection assembly 400 configured to electrically connect the first single-phase transformer 100, the second single-phase transformer 200, and the third single-phase transformer 300 together to constitute a three-phase transformer, which will be described in detail below.

In the above manner, the first single-phase transformer 100, the second single-phase transformer 200, and the third single-phase transformer 300 are combined together to constitute the combined three-phase transformer 1. Since the overall profile of a three-phase transformer depends mainly on its core shape and orientation, this overall profile in turn determines the footprint of the three-phase transformer. With the combined three-phase transformer 1 according to the present invention, since the combined three-phase transformer 1 is composed of three single-phase transformers of the first single-phase transformer 100, the second single-phase transformer 200, and the third single-phase transformer 300, and the stud cores of the three single-phase transformers are positioned and oriented around the longitudinal central axis 3 of the combined three-phase transformer 1 in the manner as described above, the ranges in which the combined three-phase transformer 1 extends in the respective horizontal directions perpendicular to the longitudinal central axis 3 are made approximately equal. For example, the profile of the combined three-phase transformer 1 in each horizontal direction perpendicular to the longitudinal center axis 3 may lie entirely or substantially entirely within a circle that is centered on the longitudinal center axis 3 and that is a circumscribed circle of an equilateral triangle in which the regular triangular prism is sectioned by a plane perpendicular to the longitudinal center axis 3. In this way, the combined three-phase transformer 1 has an improved footprint, and is thus able to accommodate confined spaces having substantially the same extension in two horizontal directions perpendicular to each other. Such a confined space is in particular the tower or nacelle space of a wind power tower.

In addition, since the combined three-phase transformer 1 is composed of three single-phase transformers, when any one of the three single-phase transformers fails, the failed single-phase transformer can be easily replaced, so that rapid troubleshooting is realized, and the maintenance and repair of the three-phase transformer are facilitated. This is particularly advantageous for applications where the three-phase transformer is arranged in a confined space, as the confined space increases the complexity of maintenance and repair.

With continued reference to fig. 1, the first core 101 of the first single-phase transformer 100 is held by the first clamping assembly 104. The first clamping assembly 104 includes an upper clamping piece 104a and a lower clamping piece 104b that clamp the first core 101 at opposite ends of the first core 101 along the longitudinal central axis 3 of the combined three-phase transformer 1, respectively. Referring to fig. 1 and with further reference to fig. 2-10, a first single-phase transformer 100 includes a first low-voltage winding and a first high-voltage winding. The first low voltage winding comprises a first low voltage coil 105 and a second low voltage coil 107, respectively, arranged around the core leg of the first core 101. The first high voltage winding comprises a first high voltage coil 109 and a second high voltage coil 111 arranged around the first low voltage coil 105 and the second low voltage coil 107, respectively. As shown in fig. 1, 2, 3, 9 and 10, the first high voltage coil 109 includes a first high voltage incoming terminal 109a and a first high voltage outgoing terminal 109b that are led out from the first high voltage coil 109. As shown in fig. 1, 2, 3, 9 and 10, the second high voltage coil 111 includes a second high voltage incoming terminal 111a and a second high voltage outgoing terminal 111b led out from the second high voltage coil 111. It should be understood that the first low-voltage winding and the first high-voltage winding of the first single-phase transformer 100 may be held stationary relative to the first core 101 in the manner described above by various suitable means known in the art.

Similar to the first single-phase transformer 100, as shown in fig. 1, the second core 201 of the second single-phase transformer 200 and the third core 301 of the third single-phase transformer 300 may also be held fixed by a second clamping assembly 204 and a third clamping assembly 304, respectively, similar to the first clamping assembly 104. It should also be understood that the high and low voltage windings of second single phase transformer 200 and the high and low voltage windings of third single phase transformer 300 may also be held stationary with respect to second and third cores 201 and 301, respectively, in a manner similar to the first low and high voltage windings of first single phase transformer 100, in a variety of suitable manners known in the art. The combined three-phase transformer 1 may also have other suitable holding mechanisms to hold the core and the windings fixed relative to each other.

Similar to the first single-phase transformer 100, the second single-phase transformer 200 includes a second low-voltage winding and a second high-voltage winding. The second low-voltage winding includes a third low-voltage coil 205 and a fourth low-voltage coil 207 respectively arranged around the core legs of the second core 201. The second high voltage winding comprises a third high voltage coil 209 and a fourth high voltage coil 211 arranged around the third low voltage coil 205 and the fourth low voltage coil 207, respectively. As shown in fig. 1, 2, 9 and 10, the third high voltage coil 209 includes a third high voltage inlet terminal 209a and a third high voltage outlet terminal 209b that are led out from the third high voltage coil 209. As shown in fig. 1, 2, 9 and 10, the fourth high voltage coil 211 includes a fourth high voltage incoming terminal 211a and a fourth high voltage outgoing terminal 211b that are led out from the fourth high voltage coil 211.

Further, the third single-phase transformer 300 includes a third low-voltage winding and a third high-voltage winding, similar to the first single-phase transformer 100 and the second single-phase transformer 200. The third low voltage winding comprises a fifth low voltage coil 305 and a sixth low voltage coil 307, respectively, arranged around the core leg of the third core 301. The third high voltage winding comprises a fifth high voltage coil 309 and a sixth high voltage coil 311 arranged around the fifth low voltage coil 305 and the sixth low voltage coil 307, respectively. As shown in fig. 1, 3, 9 and 10, the fifth high-voltage coil 309 includes a fifth high-voltage incoming terminal 309a and a fifth high-voltage outgoing terminal 309b that are led out from the fifth high-voltage coil 309. As shown in fig. 1, 3, 9 and 10, the sixth high voltage coil 311 includes a sixth high voltage incoming terminal 311a and a sixth high voltage outgoing terminal 311b led out from the sixth high voltage coil 311.

As shown in fig. 1 to 3, 5 and 9 to 10, the first single-phase transformer 100, the second single-phase transformer 200 and the third single-phase transformer 300 enclose a first space S around the longitudinal central axis 3 of the combined three-phase transformer 1, and each of the first high voltage wire inlet end 109a, the first high voltage wire outlet end 109b, the second high voltage wire inlet end 111a, the second high voltage wire outlet end 111b, the third high voltage wire inlet end 209a, the third high voltage wire outlet end 209b, the fourth high voltage wire inlet end 211a, the fourth high voltage wire outlet end 211b, the fifth high voltage wire inlet end 309a, the fifth high voltage wire outlet end 309b, the sixth high voltage wire inlet end 311a, and the sixth high voltage wire outlet end 311b is led out from a portion of a corresponding one of the first high voltage coil 109, the second high voltage coil 111, the third high voltage coil 209, the fourth high voltage coil 211, the fifth high voltage coil 309, and the sixth high voltage coil 311, which faces the first space S, into the first space S. Leading out each of the high voltage incoming terminal and the high voltage outgoing terminal from the portion of the corresponding high voltage coil facing the first space S into the first space S makes it possible to perform high voltage incoming and outgoing in the first space S, thereby further reducing the occupied space of the combined three-phase transformer 1.

In some examples, as shown in fig. 1 to 3 and 5, the first high voltage wire inlet end 109a and the first high voltage wire outlet end 109b are spaced apart from and aligned with each other in a direction parallel to the longitudinal central axis 3, the second high voltage wire inlet end 111a and the second high voltage wire outlet end 111b are spaced apart from and aligned with each other in a direction parallel to the longitudinal central axis 3, the third high voltage wire inlet end 209a and the third high voltage wire outlet end 209b are spaced apart from and aligned with each other in a direction parallel to the longitudinal central axis 3, the fourth high voltage wire inlet end 211a and the fourth high voltage wire outlet end 211b are spaced apart from and aligned with each other in a direction parallel to the longitudinal central axis 3, the fifth high voltage wire inlet end 309a and the fifth high voltage wire outlet end 309b are spaced apart from and aligned with each other in a direction parallel to the longitudinal central axis 3, and the sixth high voltage inlet end 311a and the sixth high voltage outlet end 311b are spaced apart in a direction parallel to the longitudinal center axis 3 and are aligned with each other. In this way, high voltage incoming and outgoing lines of the combined three-phase transformer 1 are facilitated. It should be understood that in other examples, the respective high voltage inlet and outlet terminals of the combined three-phase transformer 1 can be arranged in other suitable manners, and the application is not limited thereto.

In some examples, as shown in fig. 5 and 9 to 10, the first high voltage inlet terminal 109a, the second high voltage inlet terminal 111a, the third high voltage inlet terminal 209a, the fourth high voltage inlet terminal 211a, the fifth high voltage inlet terminal 309a, and the sixth high voltage inlet terminal 311a are rotationally symmetrically arranged around the longitudinal central axis 3 at an interval of 60 degrees from each other, and the first high voltage outlet terminal 109b, the second high voltage outlet terminal 111b, the third high voltage outlet terminal 209b, the fourth high voltage outlet terminal 211b, the fifth high voltage outlet terminal 309b, and the sixth high voltage outlet terminal 311b are rotationally symmetrically arranged around the longitudinal central axis 3 at an interval of 60 degrees from each other. In this way, a loop connection can be formed in the first space S to facilitate wiring. It should be understood that in other partial examples, the respective high voltage inlet and outlet terminals of the combined three-phase transformer 1 can also be arranged around the longitudinal central axis 3 at other suitable angles to each other, and the application is not limited thereto.

It should be understood that the various embodiments of the combined three-phase transformer 1 described above may be used as both a step-up transformer and a step-down transformer.

In some examples, as shown in fig. 1-10, the combined three-phase transformer 1 is a step-up transformer, the first high voltage winding 109 is adjacent to the sixth high voltage winding 311, the second high voltage winding 111 is adjacent to the third high voltage winding 209, and the fourth high voltage winding 211 is adjacent to the fifth high voltage winding 309. As shown in fig. 5, 9 and 10, the electrical connection assembly 400 includes a high voltage side electrical connection assembly 401, which electrically connects a first high voltage wire inlet end 109a and a second high voltage wire inlet end 111a, a third high voltage wire inlet end 209a and a fourth high voltage wire inlet end 211a, a fifth high voltage wire inlet end 309a and a sixth high voltage wire inlet end 311a, a first high voltage wire outlet end 109b and a sixth high voltage wire outlet end 311b, a second high voltage wire outlet end 111b and a third high voltage wire outlet end 209b, and a fourth high voltage wire outlet end 211b and a fifth high voltage wire outlet end 309b, so as to connect the first high voltage coil 109 and the second high voltage coil 111, the third high voltage coil 209 and the fourth high voltage coil 211, and the fifth high voltage coil 309 and the sixth high voltage coil 311 in series, and electrically connect the first high voltage winding, the second high voltage winding and the third high voltage winding in a delta connection (i.e., D connection) manner. Through this kind of mode, two high-voltage coil of each in first high-voltage winding, second high-voltage winding and the third high-voltage winding are established ties for can reduce high-voltage coil's internal electric field, satisfy the requirement of internal insulation, be favorable to further reducing combined type three-phase transformer 1's occupation space. In addition, first high-voltage winding, second high-voltage winding and third high-voltage winding are connected with the mode electricity of triangular connection and are favorable to forming annular connection in first space S so that facilitate the wiring for modular three-phase transformer 1 structure is compacter, thereby is favorable to further reducing modular three-phase transformer 1' S occupation space. The high side electrical connection assembly 401 may comprise a plurality of copper bars, for example. It should be understood that in other partial examples, the respective high-voltage coils and the respective high-voltage windings of the combined three-phase transformer 1 can also be connected in other suitable manners, and the application is not limited thereto.

In a further example, as shown in fig. 9 and 10, the combined three-phase transformer 1 is a step-up transformer, and the first single-phase transformer 100, the second single-phase transformer 200, and the third single-phase transformer 300 are all resin type dry single-phase transformers. Each of the first, second, third, fourth, fifth, and sixth high-voltage coils 109, 111, 209, 211, 309, and 311 is coated with resin and formed with a resin boss 500 protruding into the first space S. Each of the first high voltage wire inlet end 109a, the first high voltage wire outlet end 109b, the second high voltage wire inlet end 111a, the second high voltage wire outlet end 111b, the third high voltage wire inlet end 209a, the third high voltage wire outlet end 209b, the fourth high voltage wire inlet end 211a, the fourth high voltage wire outlet end 211b, the fifth high voltage wire inlet end 309a, the fifth high voltage wire outlet end 309b, the sixth high voltage wire inlet end 311a, and the sixth high voltage wire outlet end 311b is led out from a corresponding one of the first high voltage coil 109, the second high voltage coil 111, the third high voltage coil 209, the fourth high voltage coil 211, the fifth high voltage coil 309, and the sixth high voltage coil 311 through a corresponding one of the resin bosses 500 into the first space S. By the mode, the requirement of internal insulation can be further met, so that the combined three-phase transformer 1 is more compact in structure, and the occupied space of the combined three-phase transformer 1 is further reduced. It is to be understood that the resin boss 500 may be formed by a suitable process such as resin-filled casting, resin winding, resin vacuum pressure impregnation, or the like.

As shown in fig. 1 to 8, the electrical connection assembly 400 includes a low voltage side electrical connection assembly that connects the first low voltage coil 105 and the second low voltage coil 107, the third low voltage coil 205 and the fourth low voltage coil 207, and the fifth low voltage coil 305 and the sixth low voltage coil 307 in parallel, and extends around the first space S above the first single phase transformer 100, the second single phase transformer 200, and the third single phase transformer 300 and electrically connects the first low voltage winding, the second low voltage winding, and the third low voltage winding in a star connection manner. Specifically, the low side electrical connection assembly includes a low voltage coil incoming connection 403a and a low voltage coil outgoing connection 403 b. As shown in fig. 5 to 8, the first low-voltage coil 105 has a first low-voltage coil incoming end 105a and a first low-voltage coil outgoing end 105b, the second low-voltage coil 107 has a second low-voltage coil incoming end 107a and a second low-voltage coil outgoing end 107b, the third low-voltage coil 205 has a third low-voltage coil incoming end 205a and a third low-voltage coil outgoing end 205b, the fourth low-voltage coil 207 has a fourth low-voltage coil incoming end 207a and a fourth low-voltage coil outgoing end 207b, the fifth low-voltage coil 305 has a fifth low-voltage coil incoming end 305a and a fifth low-voltage coil outgoing end 305b, and the sixth low-voltage coil 307 has a sixth low-voltage coil incoming end 307a and a sixth low-voltage coil outgoing end 307 b. The plurality of low-voltage coil incoming line connectors 403a electrically connect the first low-voltage coil incoming line end 105a with the second low-voltage coil incoming line end 107a, the third low-voltage coil incoming line end 205a with the fourth low-voltage coil incoming line end 207a, and the fifth low-voltage coil incoming line end 305a with the sixth low-voltage coil incoming line end 307a, so as to connect the first low-voltage coil 105 with the second low-voltage coil 107, the third low-voltage coil 205 with the fourth low-voltage coil 207, and the fifth low-voltage coil 305 with the sixth low-voltage coil 307 in parallel. In addition, the low-voltage coil outlet connector 403b electrically connects the first low-voltage coil outlet terminal 105b, the second low-voltage coil outlet terminal 107b, the third low-voltage coil outlet terminal 205b, the fourth low-voltage coil outlet terminal 207b, the fifth low-voltage coil inlet terminal 305a, and the sixth low-voltage coil outlet terminal 307b together, thereby electrically connecting the first low-voltage winding, the second low-voltage winding, and the third low-voltage winding in a star connection manner. In this way, two low-voltage coils of each of the first low-voltage winding, the second low-voltage winding and the third low-voltage winding are connected in parallel, so that the current of the low-voltage coils can be reduced, and therefore thinner wires and low-voltage coil incoming line connecting pieces 403a and low-voltage coil outgoing line connecting pieces 403b with relatively smaller current carrying capacity (correspondingly relatively narrower conductive width) can be selected, so that the combined three-phase transformer 1 is more compact in structure, and the occupied space of the combined three-phase transformer 1 can be further reduced. The low voltage coil inlet connector 403a may comprise a plurality of copper bars, for example, and the low voltage coil outlet connector 403b may be a single piece of copper bar, for example (as shown). It should be understood that in other partial examples, the respective low-voltage coils and the respective low-voltage windings of the combined three-phase transformer 1 can also be connected in other suitable manners, and the application is not limited thereto.

In some examples, as shown in fig. 5 to 8, the first low-voltage coil incoming line end 105a, the first low-voltage coil outgoing line end 105b, the second low-voltage coil incoming line end 107a, the second low-voltage coil outgoing line end 107b, the third low-voltage coil incoming line end 205a, the third low-voltage coil outgoing line end 205b, the fourth low-voltage coil incoming line end 207a, the fourth low-voltage coil outgoing line end 207b, the fifth low-voltage coil incoming line end 305a, the fifth low-voltage coil outgoing line end 305b, the sixth low-voltage coil incoming line end 307a, and the sixth low-voltage coil outgoing line end 307b are all led out from the corresponding low-voltage coil to above the corresponding low-voltage coil, so that low-voltage upper incoming line and low-voltage upper outgoing line are realized. This also contributes to a further reduction of the space occupied by the combined three-phase transformer 1. It should be understood that other low voltage inlet and outlet means are possible and the application is not limited thereto.

In some examples, the first single-phase transformer 100, the second single-phase transformer 200, and the third single-phase transformer 300 may be identical in structure, thereby implementing the modular combined three-phase transformer 1 for easy maintenance and repair.

Fig. 12 schematically shows another version of a combined three-phase transformer 1 according to the invention. The same reference numerals are used in fig. 12 to designate the same or similar parts as those in fig. 1 to 10. Unlike the combined three-phase transformer 1 shown in fig. 1 to 5, the combined three-phase transformer 1 shown in fig. 12 further includes an insulation board assembly. For example, as shown in fig. 11, the insulation plate assembly includes six insulation plates 600a, 600b, 600c, 600d, 600e, and 600f, which may be impregnated with resin varnish. Six insulating plates 600a, 600b, 600c, 600d, 600e, and 600f may be held in place by clips 700a and 700 b. As shown in fig. 12, the insulation plate assembly separates and provides reinforced insulation between each pair of adjacent two high voltage coils of the first high voltage coil 109, the second high voltage coil 111, the third high voltage coil 209, the fourth high voltage coil 211, the fifth high voltage coil 309 and the sixth high voltage coil 311. This makes the combined three-phase transformer 1 more compact, which is advantageous for further reducing the occupied space of the combined three-phase transformer 1.

It will be appreciated that the examples described above can be implemented individually or in combination without departing from the scope of the invention.

Furthermore, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used merely to distinguish one element or section from another element or section, but these sections should not be limited by such terms.

The utility model provides a modular three-phase transformer, its first iron core of first single-phase transformer, the second iron core of second single-phase transformer is the same with the third iron core structure of third single-phase transformer, and 120 degrees ground rotational symmetry arrange each other around the longitudinal central axis of modular three-phase transformer, make the first plane of first iron core, the second plane of second iron core and the third plane of third iron core intersect each other to become 60 degrees ground and enclose into positive triangular prism shape as three side, wherein, first iron core, every in second iron core and the third iron core is located the corresponding one in the three side of positive triangular prism shape, and the iron core post of first iron core, second iron core and third iron core is all oriented into being on a parallel with longitudinal central axis. According to the utility model discloses a combination formula three-phase transformer has improved occupation space, can adapt to the confined space that has roughly the same extension along two horizontal directions of mutually perpendicular.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A combined three-phase transformer (1), characterized in that the combined three-phase transformer (1) has a longitudinal centre axis (3) and comprises:

a first single-phase transformer (100), the first single-phase transformer (100) comprising a first core (101) of dual limb type, the first core (101) defining a first plane (103), a core limb and a yoke of the first core (101) both lying within the first plane (103);

a second single phase transformer (200) arranged adjacent to the first single phase transformer (100), the second single phase transformer (200) comprising a second core (201) of double limb type, the second core (201) defining a second plane (203), the core limb and the yoke of the second core (201) both being located within the second plane (203); and

a third single phase transformer (300) arranged adjacent to the first single phase transformer (100) and the second single phase transformer (200), the third single phase transformer (300) comprising a double limb third core (301), the third core (301) defining a third plane (303), the core limb and the yoke of the third core (301) both being located within the third plane (303);

the first core (101), the second core (201) and the third core (301) are structurally identical and are arranged rotationally symmetrically about the longitudinal center axis (3) at a mutual distance of 120 degrees such that the first plane (103), the second plane (203) and the third plane (303) intersect each other at 60 degrees and enclose as three sides a right triangular prism shape, wherein each of the first core (101), the second core (201) and the third core (301) is located within a respective one of the three sides of the right triangular prism shape and the core legs of the first core (101), the second core (201) and the third core (301) are each oriented parallel to the longitudinal center axis (3);

the combined three-phase transformer (1) further comprises an electrical connection assembly (400), the electrical connection assembly (400) electrically connecting the first single-phase transformer (100), the second single-phase transformer (200) and the third single-phase transformer (300) together to constitute a three-phase transformer.

2. Combined three-phase transformer (1) according to claim 1, characterized in that:

the first single-phase transformer (100) comprises a first low-voltage winding and a first high-voltage winding, the first low-voltage winding comprises a first low-voltage coil (105) and a second low-voltage coil (107) which are respectively arranged around a core leg of the first iron core (101), the first high-voltage winding comprises a first high-voltage coil (109) and a second high-voltage coil (111) which are respectively arranged around the first low-voltage coil (105) and the second low-voltage coil (107), the first high-voltage coil (109) comprises a first high-voltage incoming end (109a) and a first high-voltage outgoing end (109b) which are led out from the first high-voltage coil (109), and the second high-voltage coil (111) comprises a second high-voltage incoming end (111a) and a second high-voltage outgoing end (111b) which are led out from the second high-voltage coil (111);

the second single-phase transformer (200) comprises a second low-voltage winding and a second high-voltage winding, the second low-voltage winding comprises a third low-voltage coil (205) and a fourth low-voltage coil (207) respectively arranged around a core leg of the second core (201), the second high-voltage winding comprises a third high-voltage coil (209) and a fourth high-voltage coil (211) respectively arranged around the third low-voltage coil (205) and the fourth low-voltage coil (207), the third high-voltage coil (209) comprises a third high-voltage inlet end (209a) and a third high-voltage outlet end (209b) led out from the third high-voltage coil (209), and the fourth high-voltage coil (211) comprises a fourth high-voltage inlet end (211a) and a fourth high-voltage outlet end (211b) led out from the fourth high-voltage coil (211); and

the third single-phase transformer (300) comprises a third low-voltage winding and a third high-voltage winding, the third low-voltage winding comprises a fifth low-voltage coil (305) and a sixth low-voltage coil (307) which are respectively arranged around a core leg of the third core (301), the third high-voltage winding comprises a fifth high-voltage coil (309) and a sixth high-voltage coil (311) which are respectively arranged around the fifth low-voltage coil (305) and the sixth low-voltage coil (307), the fifth high-voltage coil (309) comprises a fifth high-voltage wire inlet end (309a) and a fifth high-voltage wire outlet end (309b) which are led out from the fifth high-voltage coil (309), and the sixth high-voltage coil (311) comprises a sixth high-voltage wire inlet end (311a) and a sixth high-voltage wire outlet end (311b) which are led out from the sixth high-voltage coil (311);

wherein the first single-phase transformer (100), the second single-phase transformer (200), and the third single-phase transformer (300) enclose a first space around the longitudinal center axis (3), and the first high-voltage wire inlet end (109a), the first high-voltage wire outlet end (109b), the second high-voltage wire inlet end (111a), the second high-voltage wire outlet end (111b), the third high-voltage wire inlet end (209a), the third high-voltage wire outlet end (209b), the fourth high-voltage wire inlet end (211a), the fourth high-voltage wire outlet end (211b), the fifth high-voltage wire inlet end (309a), the fifth high-voltage wire outlet end (309b), the sixth high-voltage wire inlet end (311a), and the sixth high-voltage wire outlet end (311b) are each surrounded from the first high-voltage coil (109), the second high-voltage coil (111), and the third high-voltage wire outlet end (311b) A portion of a respective one of the third high voltage coil (209), the fourth high voltage coil (211), the fifth high voltage coil (309) and the sixth high voltage coil (311) facing the first space is led out into the first space.

3. Combined three-phase transformer (1) according to claim 2, characterized in that:

the first high voltage inlet end (109a) and the first high voltage outlet end (109b) are spaced apart in a direction parallel to the longitudinal central axis (3) and are aligned with each other;

the second high voltage inlet end (111a) and the second high voltage outlet end (111b) are spaced apart in a direction parallel to the longitudinal central axis (3) and are aligned with each other;

-said third high pressure inlet end (209a) and said third high pressure outlet end (209b) are spaced apart and aligned with each other in a direction parallel to said longitudinal central axis (3);

the fourth high voltage inlet end (211a) and the fourth high voltage outlet end (211b) are spaced apart in a direction parallel to the longitudinal central axis (3) and are aligned with each other;

said fifth high voltage inlet end (309a) and said fifth high voltage outlet end (309b) being spaced apart in a direction parallel to said longitudinal central axis (3) and being aligned with each other; and

the sixth high voltage inlet end (311a) and the sixth high voltage outlet end (311b) are spaced apart in a direction parallel to the longitudinal center axis (3) and are aligned with each other.

4. The combined three-phase transformer (1) according to claim 3, wherein the first high voltage inlet terminal (109a), the second high voltage inlet terminal (111a), the third high voltage inlet terminal (209a), the fourth high voltage inlet terminal (211a), the fifth high voltage inlet terminal (309a) and the sixth high voltage inlet terminal (311a) are arranged rotationally symmetrically with respect to each other at 60 degrees around the longitudinal center axis (3), and the first high voltage outlet terminal (109b), the second high voltage outlet terminal (111b), the third high voltage outlet terminal (209b), the fourth high voltage outlet terminal (211b), the fifth high voltage outlet terminal (309b) and the sixth high voltage outlet terminal (311b) are arranged rotationally symmetrically with respect to each other at 60 degrees around the longitudinal center axis (3).

5. The combined three-phase transformer (1) according to claim 4, wherein the combined three-phase transformer (1) is a step-up transformer, the first high-voltage winding (109) is adjacent to the sixth high-voltage winding (311), the second high-voltage winding (111) is adjacent to the third high-voltage winding (209), and the fourth high-voltage winding (211) is adjacent to the fifth high-voltage winding (309), the electrical connection assembly (400) comprises a high-voltage side electrical connection assembly which electrically connects the first high-voltage line inlet end (109a) and the second high-voltage line inlet end (111a), the third high-voltage line inlet end (209a) and the fourth high-voltage line inlet end (211a), the fifth high-voltage line inlet end (309a) and the sixth high-voltage line inlet end (311a), the first high-voltage line outlet end (109b) and the sixth high-voltage line outlet end (311b), and the electrical connection assembly comprises a high-voltage side electrical connection assembly, The second high-voltage wire outlet end (111b) is electrically connected with the third high-voltage wire outlet end (209b), the fourth high-voltage wire outlet end (211b) is electrically connected with the fifth high-voltage wire outlet end (309b), so that the first high-voltage coil (109) and the second high-voltage coil (111), the third high-voltage coil (209) and the fourth high-voltage coil (211), and the fifth high-voltage coil (309) and the sixth high-voltage coil (311) are connected in series, and the first high-voltage winding, the second high-voltage winding and the third high-voltage winding are electrically connected in a triangular connection mode.

6. The combined three-phase transformer (1) according to claim 5, wherein the first single-phase transformer (100), the second single-phase transformer (200), and the third single-phase transformer (300) are resin-type dry-type single-phase transformers, each of the first high-voltage coil (109), the second high-voltage coil (111), the third high-voltage coil (209), the fourth high-voltage coil (211), the fifth high-voltage coil (309), and the sixth high-voltage coil (311) is coated with resin and is formed with a resin boss protruding into the first space, and the first high-voltage line inlet end (109a), the first high-voltage line outlet end (109b), the second high-voltage line inlet end (111a), the second high-voltage line outlet end (111b), the third high-voltage line inlet end (209a), the third high-voltage line outlet end (209b), and the third high-voltage line outlet end (209b), Each of the fourth high voltage wire inlet end (211a), the fourth high voltage wire outlet end (211b), the fifth high voltage wire inlet end (309a), the fifth high voltage wire outlet end (309b), the sixth high voltage wire inlet end (311a), and the sixth high voltage wire outlet end (311b) is led out from a corresponding one of the first high voltage coil (109), the second high voltage coil (111), the third high voltage coil (209), the fourth high voltage coil (211), the fifth high voltage coil (309), and the sixth high voltage coil (311) through a corresponding one of the resin bosses into the first space.

7. The combined three-phase transformer (1) according to any one of claims 2 to 6, characterized in that the electrical connection assembly (400) comprises a low-voltage side electrical connection assembly connecting the first low-voltage coil (105) and the second low-voltage coil (107), the third low-voltage coil (205) and the fourth low-voltage coil (207), the fifth low-voltage coil (305) and the sixth low-voltage coil (307) in parallel, and extending around the first space above the first single-phase transformer (100), the second single-phase transformer (200) and the third single-phase transformer (300) and electrically connecting the first low-voltage winding, the second low-voltage winding and the third low-voltage winding in a star connection.

8. The combined three-phase transformer (1) according to claim 7, wherein a low voltage incoming end and a low voltage outgoing end of each of the first low voltage coil (105), the second low voltage coil (107), the third low voltage coil (205), the fourth low voltage coil (207), the fifth low voltage coil (305) and the sixth low voltage coil (307) are led out from the corresponding low voltage coil of the first low voltage coil (105), the second low voltage coil (107), the third low voltage coil (205), the fourth low voltage coil (207), the fifth low voltage coil (305) and the sixth low voltage coil (307) to above the corresponding low voltage coil, thereby realizing low voltage incoming and low voltage outgoing lines.

9. The combined three-phase transformer (1) according to any one of claims 2 to 6, characterized in that the combined three-phase transformer (1) further comprises an insulation board assembly separating and providing a reinforced insulation between each pair of adjacent two of the first (109), second (111), third (209), fourth (211), fifth (309) and sixth (311) high voltage coils.

10. The combined three-phase transformer (1) according to any one of claims 1 to 6, characterized in that the first single-phase transformer (100), the second single-phase transformer (200) and the third single-phase transformer (300) are structurally identical.

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