Dual-ratio transformer

Abstract

The embodiment of the application provides a double transformation ratio transformer, which comprises a first primary winding, a second primary winding, a first shielding cover, a second shielding cover, a third shielding cover and a connecting wire; the first primary winding and the second primary winding are respectively provided with an incoming wire joint and an outgoing wire joint, the three shielding covers are respectively provided with three shielding spaces and two openings, and the connecting wire comprises two connecting joints. The incoming wire joint and the outgoing wire joint of the first primary winding and the second primary winding and the connecting joint of the connecting wire are connected in different connection modes to realize the series connection and the parallel connection of the first primary winding and the second primary winding, and the connection is realized in the shielding space of the three shielding covers. The three shielding covers ensure the uniform electric field at the connection position of the first primary winding and the second primary winding in series connection and parallel connection. Therefore, by the arrangement of the shielding cover and the connection of the connecting wire, the series connection or the parallel connection of the two primary windings of the double transformation ratio transformer is realized, and the electric field balance at the connection position is ensured.

Description

Technical Field

[0001] This invention relates to the field of electrical technology, and more specifically to a dual-ratio transformer. Background Technology

[0002] Transformers utilize the principle of electromagnetic induction to change alternating current voltage. They are fundamental equipment for power transmission and distribution, widely used in industry, agriculture, transportation, and urban communities. A two-turn transformer can connect its two windings in series or parallel according to changes in the input voltage, changing the effective number of turns in the windings and thus altering the turns ratio of the primary and secondary windings. This allows for adjustment of the ratio of the transformer's input and output voltages. Commonly, the series and parallel connection of the two windings in a two-turn transformer is achieved through conductors and switches. This connection can create an uneven electric field at the junction, affecting the normal operation of the equipment. Summary of the Invention

[0003] In view of this, the present invention provides a dual-ratio transformer, which at least partially solves the above-mentioned technical problems.

[0004] To achieve the above objectives, embodiments of the present invention provide a dual-ratio transformer, comprising: a first primary winding having a first inlet connector and a first outlet connector; a second primary winding having a second inlet connector and a second outlet connector; a first shielding cover configured to have a first shielding space, a first opening, and a second opening; a second shielding cover configured to have a second shielding space, a third opening, and a fourth opening; a third shielding cover configured to have a third shielding space, a fifth opening, and a sixth opening; and a connecting wire comprising a first connector and a second connector; wherein the first connector enters the third shielding space through the fifth opening and is electrically connected to the second inlet connector entering the third shielding space through the sixth opening; the third shielding cover shields the electric field generated at the connection point between the first connector and the second inlet connector; the first inlet connector enters the first shielding space through the first opening; and the first outlet connector enters the second shielding space through the third opening.

[0005] The second connector enters the second shielding space through the fourth opening and is electrically connected to the first outgoing connector, so that the first primary winding and the second primary winding are connected in series. The second shield shields the electric field generated at the connection position of the second connector and the first outgoing connector. Alternatively, the second connector enters the first shielding space through the second opening and is electrically connected to the first incoming connector. The second outgoing connector enters the second shielding space through the fourth opening and is electrically connected to the first outgoing connector, so that the first primary winding and the second primary winding are connected in parallel. The first shield shields the electric field generated at the connection position of the second connector and the first incoming connector. The second shield shields the electric field generated at the connection position of the second outgoing connector and the first outgoing connector.

[0006] In the dual-ratio transformer provided in this embodiment of the invention, the input and output terminals of the first and second primary windings, as well as the connectors of the connecting wires, achieve series and parallel connections between the first and second primary windings through different connection methods. Moreover, all connections are made within the three shielding spaces of the three shielding covers. The three shielding covers ensure a uniform electric field at the connection point when the first and second primary windings are connected in series and parallel. Therefore, through the setting of the shielding covers and the connection of the connecting wires, the electric field balance at the connection point is ensured while achieving series or parallel connections between the two primary windings of the dual-ratio transformer.

[0007] In another embodiment of the present invention, the first shielding cover, the second shielding cover, and the third shielding cover each include a circular shielding cover. Each circular shielding cover includes multiple rings and multiple connecting strips. The multiple rings are parallel to each other and of equal size, and their axes coincide. The connecting strips connect adjacent rings along the axial direction of the circular shielding cover. The rings at both ends of the three circular shielding covers respectively form the first opening and the second opening, the third opening and the fourth opening, and the fifth opening and the sixth opening. In this embodiment, the shielding cover structure is simple and the shielding effect is good.

[0008] In another embodiment of the present invention, the first shielding cover, the second shielding cover, and the third shielding cover each include a spiral shielding cover, wherein the spiral shielding cover is spiral-shaped and surrounds a baseline; the two ends of the three spiral shielding covers respectively have the first opening and the second opening, the third opening and the fourth opening, and the fifth opening and the sixth opening. In this embodiment, the shielding cover is easy to manufacture and has good heat dissipation performance.

[0009] In another implementation of the present invention, the first shielding cover, the second shielding cover, and the third shielding cover each include a cylindrical shielding cover; the two ends of the three cylindrical shielding covers respectively have the first opening and the second opening, the third opening and the fourth opening, and the fifth opening and the sixth opening. In this implementation, the shielding cover not only ensures a uniform electric field but also prevents foreign objects from entering and affecting the connection.

[0010] In another embodiment of the invention, the first shielding cover, the second shielding cover, and the third shielding cover each comprise an aluminum alloy shielding cover. In this embodiment, the shielding cover is easy to manufacture and has low cost.

[0011] In another embodiment of the invention, the first shielding cover, the second shielding cover, and the third shielding cover each include a copper shielding cover. In this embodiment, the shielding cover has higher strength and is less prone to deformation and damage.

[0012] In another embodiment of the invention, the connecting wire includes a copper conductor, with the first connector and the second connector at its two ends. In this embodiment, the connecting wire has lower resistance and generates less heat, which helps to reduce the temperature rise of the device.

[0013] In another implementation of the invention, the first primary winding and the second primary winding have the same number of turns. In this implementation, the effective number of turns is easy to calculate when the two windings are connected in series and in parallel.

[0014] In another implementation of the invention, the dual-ratio transformer comprises three phases, wherein each phase includes a first primary winding, a second primary winding, a first shield, a second shield, a third shield, and a connecting wire. In this implementation, the dual-ratio transformer comprises three phases, and the turns ratio of the three-phase windings can be adjusted as needed.

[0015] In another implementation of the invention, the input voltage of the dual-ratio transformer is 110 kV or 220 kV. In this implementation, the dual-ratio transformer has a wider range of applications in the power grid.

[0016] In another implementation of the invention, the dual-ratio transformer is a step-down transformer. In this implementation, the secondary winding of the dual-ratio transformer has fewer turns, and the connection of the two primary windings is more convenient.

[0017] In another implementation of the present invention, the dual-ratio transformer further includes a first voltage regulating winding and a second voltage regulating winding, wherein the first voltage regulating winding is connected in series with the first primary winding, and the second voltage regulating winding is connected in series with the second primary winding. In this implementation, adjusting the number of turns connected to the voltage regulating winding can change the effective number of turns of the primary winding, thereby ensuring the stability of the output voltage during grid fluctuations. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 A schematic structural diagram of a dual-ratio transformer provided for an embodiment of the present invention;

[0020] Figure 2 A schematic structural diagram of a dual-ratio transformer provided for an embodiment of the present invention, wherein the first primary winding and the second primary winding are connected in series;

[0021] Figure 3 A schematic structural diagram of a dual-ratio transformer provided for an embodiment of the present invention, wherein the first primary winding and the second primary winding are connected in parallel;

[0022] Figure 4 A schematic perspective view of a shielding cover provided for an embodiment of the present invention;

[0023] Figure 5 A schematic perspective view of a shielding cover provided for an embodiment of the present invention;

[0024] Figure 6 A schematic perspective view of a shielding cover provided for an embodiment of the present invention;

[0025] Figure 7 A schematic structural diagram of a dual-ratio transformer provided for an embodiment of the present invention.

[0026] List of reference numerals in the attached diagram:

[0027] 100: First primary winding; 110: First incoming connector; 120: First outgoing connector;

[0028] 200: Second primary winding; 210: Second incoming connector; 220: Second outgoing connector;

[0029] 310: First shielding cover; 311: First shielding space; 312: First opening; 313: Second opening;

[0030] 320: Second shielding cover; 321: Second shielding space; 322: Third opening; 323: Fourth opening;

[0031] 330: Third shielding cover; 331: Third shielding space; 332: Fifth opening; 333: Sixth opening;

[0032] 301: Circular shielding cover; 302: Circular ring; 303: Connecting strip; 304: Spiral shielding cover; 305: Cylindrical shielding cover;

[0033] 400: Conductor; 410: First connector; 420: Second connector.

[0034] 510: First voltage regulating winding; 520: Second voltage regulating winding; 600: Secondary winding; and 700: Iron core. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art should fall within the protection scope of the present invention.

[0036] like Figure 1-3 As shown, an embodiment of the present invention provides a dual-ratio transformer, comprising: a first primary winding 100 having a first inlet connector 110 and a first outlet connector 120; a second primary winding 200 having a second inlet connector 210 and a second outlet connector 220; a first shielding cover 310 configured to have a first shielding space 311, a first opening 312, and a second opening 313; a second shielding cover 320 configured to have a second shielding space 321, a third opening 322, and a fourth opening 323; and a third shielding cover 330 configured to have a first shielding space 321, a third opening 322, and a fourth opening 323; and a third shielding cover 330 configured to have a second shielding space 321, a third opening 322, and a fourth opening 323; and a third shielding cover 330 configured to have a second shielding space 321, a third opening 322, and a fourth opening 323; The shielding covers 331, 332, and 333; and 400, including a first connector 410 and a second connector 420. The first connector 410 enters the third shielding space 331 through the fifth opening 332 and is electrically connected to a second inlet connector 210 that enters the third shielding space 331 through the sixth opening 333. The third shielding covers 330 shield the electric field generated at the connection point between the first connector 410 and the second inlet connector 210. The first inlet connector 110 enters the first shielding space 311 through the first opening 312. The first outlet connector 120 enters the second shielding space 321 through the third opening 322.

[0037] The second connector 420 enters the second shielding space 321 through the fourth opening 323 and is electrically connected to the first output connector 120, so that the first primary winding 100 and the second primary winding 200 are connected in series. The second shielding cover 320 shields the electric field generated at the connection position of the second connector 420 and the first output connector 120. Alternatively, the second connector 420 enters the first shielding space 311 through the second opening 313 and is electrically connected to the first input connector 110, and the second output connector 220 enters the second shielding space 321 through the fourth opening 323 and is electrically connected to the first output connector 120, so that the first primary winding 100 and the second primary winding 200 are connected in parallel. The first shielding cover 310 shields the electric field generated at the connection position of the second connector 420 and the first input connector 110, and the second shielding cover 320 shields the electric field generated at the connection position of the second output connector 220 and the first output connector 120.

[0038] In the dual-ratio transformer provided in this embodiment of the invention, the inlet and outlet terminals of the first primary winding 100 and the second primary winding 200, as well as the connector of the connecting wire 400, are connected in series and in parallel through different connection methods. Moreover, all connections are made within the shielded space of three shielding covers. The three shielding covers ensure that the electric field at the connection point between the first primary winding 100 and the second primary winding 200 is uniform when they are connected in series and in parallel. Therefore, through the setting of the shielding covers and the connection of the connecting wires, the electric field balance at the connection point is ensured while realizing the series or parallel connection of the two primary windings of the dual-ratio transformer.

[0039] It is important to note that Figure 1-3 This is merely a schematic diagram of a dual-ratio transformer. The positional relationship between the first shield 310, the second shield 320, and the third shield 330 is not intended to limit the structure of the dual-ratio transformer. In practical applications, the three shields can be arranged arbitrarily, as long as it is convenient for connection and installation.

[0040] To facilitate installation and series-parallel switching, dual-ratio transformers can be installed according to... Figure 7 The configuration shown is as follows: from the inside out, the components are: iron core 700, secondary winding 600, and two primary windings 100 and 200. This way, the connections of the two primary windings and connecting wires inside the shield are made on the outside of the transformer, unaffected by the iron core 700 and secondary winding 600.

[0041] Optionally, the incoming and outgoing cable connectors, as well as the connectors between the incoming and outgoing cable connectors and the connecting wires, can be connected by bolts. Bolted connections are simple, reliable, and have low contact resistance.

[0042] like Figure 4As shown, in another implementation of the present invention, the first shielding cover 310, the second shielding cover 320, and the third shielding cover 330 each include an annular shielding cover 301. The annular shielding cover 301 includes multiple rings 302 and multiple connecting strips 303. The multiple rings 302 are parallel to each other and of equal size, and their axes coincide. The connecting strips 303 connect adjacent rings 302 along the axial direction of the annular shielding cover 301. The rings 302 at both ends of the three annular shielding covers 301 respectively form a first opening 312 and a second opening 313, a third opening 322 and a fourth opening 323, and a fifth opening 332 and a sixth opening 333. This shielding cover structure is simple and has a good shielding effect.

[0043] Optionally, one of the connecting strips of the shielding cover has an extension extending toward the axis of the shielding cover, and the shielding cover can be fixed by the extension and the inlet / outlet connectors or joints therein. For example, when the inlet / outlet connectors are connected by bolts, and when the inlet / outlet connectors and the joints of the connecting wires are connected by bolts, the extension has a through hole near the axis of the shielding ring, so that it can be fixed to the bolt connection.

[0044] like Figure 5 As shown, in another implementation of the present invention, the first shielding cover 310, the second shielding cover 320, and the third shielding cover 330 each include a spiral shielding cover 304, which is spirally shaped around a reference line; the two ends of the three spiral shielding covers 304 respectively have a first opening 312 and a second opening 313, a third opening 322 and a fourth opening 323, and a fifth opening 332 and a sixth opening 333. This shielding cover is easy to manufacture and has good heat dissipation performance.

[0045] like Figure 6 As shown, in another implementation of the present invention, the first shielding cover 310, the second shielding cover 320, and the third shielding cover 330 each include a cylindrical shielding cover 305; the two ends of the three cylindrical shielding covers 305 respectively have a first opening 312 and a second opening 313, a third opening 322 and a fourth opening 323, and a fifth opening 332 and a sixth opening 333. This type of shielding cover, in addition to ensuring a uniform electric field, can also prevent foreign objects from entering and affecting the connection.

[0046] Optionally, the first shielding cover 310, the second shielding cover 320, and the third shielding cover 330 each include an aluminum alloy shielding cover. Such shielding covers are easy to process and manufacture, and are inexpensive.

[0047] Optionally, the first shielding cover 310, the second shielding cover 320, and the third shielding cover 330 each include a copper shielding cover. This type of shielding cover has higher strength and is less prone to deformation and damage.

[0048] In another embodiment of the invention, the connecting line 400 includes a copper conductor, with its two ends being a first connector 410 and a second connector 420, respectively. In this embodiment, the connecting line has lower resistance and generates less heat, which helps to reduce the temperature rise of the device.

[0049] In another implementation of the present invention, the first primary winding 100 and the second primary winding 200 have the same number of turns. In this implementation, the effective number of turns is easy to calculate when the two windings are connected in series and in parallel. When connected in parallel, the effective number of turns is the same as the number of turns in a single primary winding; when connected in series, the effective number of turns is twice the number of turns in a single primary winding. The calculation of the effective number of turns when the two primary windings are connected in series and in parallel is convenient. That is to say, the input voltage of the two-turn transformer when the two primary windings are connected in series is twice the input voltage when the two primary windings are connected in parallel. For example, the input voltage is 20 kV when the two primary windings are connected in series and 10 kV when connected in parallel. No specific limitation is made to the input voltage of the two-turn transformer here.

[0050] In another implementation of the invention, the dual-ratio transformer comprises three phases, each phase comprising a first primary winding 100, a second primary winding 200, a first shielding cover 310, a second shielding cover 320, a third shielding cover 330, and a connecting wire 400. In this implementation, the dual-ratio transformer comprises three phases, and the turns ratio of the three-phase windings can be adjusted as needed.

[0051] The nine shields for the three phases can be placed on the same side of the three-phase transformer, or the three shields for each phase can be placed near each phase, or the shields for the two outer phases can be placed on the two outer sides, and the shield for the middle phase can be placed on one side.

[0052] In another implementation of this invention, the input voltage of the dual-ratio transformer is 110 kV or 220 kV. That is, the input voltage is 220 kV when the two primary windings of the dual-ratio transformer are connected in series, and 110 kV when they are connected in parallel. The output voltage is the same under both input voltages, and no specific limitation is made to the output voltage of the dual-ratio transformer here. 110 kV and 220 kV are common transmission voltages in power grids; therefore, when the input voltage of the dual-ratio transformer is 110 kV or 220 kV, its application range in the power grid is wider, which is beneficial for product promotion.

[0053] In another implementation of the invention, the dual-ratio transformer is a step-down transformer. In a step-down transformer, the number of turns in the secondary winding is significantly less than that in the primary winding. Since the secondary winding of a dual-ratio transformer has fewer turns, the connection between the two primary windings is more convenient.

[0054] like Figure 7As shown, in another implementation of the present invention, the dual-ratio transformer further includes a first voltage regulating winding 510 and a second voltage regulating winding 520. The first voltage regulating winding 510 and the first primary winding 100 are connected in series, and the second voltage regulating winding 520 and the second primary winding 200 are connected in series. In practical applications, small fluctuations often occur in the power grid, and changes in the input voltage can lead to unstable output voltage. In this implementation, the number of turns in the voltage regulating winding can be adjusted according to changes in the input voltage. Adjusting the number of turns in the voltage regulating winding can change the effective number of turns in the primary winding, thereby ensuring the stability of the output voltage during power grid fluctuations.

[0055] The two voltage regulating windings can be further positioned outside the two primary windings for easy connection and adjustment. Optionally, the two voltage regulating windings are matched with the two primary sub-windings respectively in the height direction, and do not extend beyond the upper and lower ends of the two primary windings in the height direction. This arrangement prevents the dual-ratio transformer from experiencing ampere-turn imbalance due to the additional leakage magnetic field generated by the voltage regulating windings, thus avoiding increased eddy current losses.

[0056] The above embodiments and implementations are merely specific descriptions of feasible embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. All equivalent or modified solutions made based on the technical concept of the present invention are included within the scope of protection of the present invention, such as the segmentation and recombination of features.

Claims

1. A dual-ratio transformer, characterized by, The application relates to a transformer, which comprises: a first primary winding (100) having a first input terminal (110) and a first output terminal (120); a second primary winding (200) having a second input terminal (210) and a second output terminal (220); a first shielding cover (310) configured to have a first shielding space (311), a first opening (312) and a second opening (313); a second shielding cover (320) configured to have a second shielding space (321), a third opening (322) and a fourth opening (323); a third shielding cover (330) configured to have a third shielding space (331), a fifth opening (332) and a sixth opening (333); and a connecting wire (400) comprising a first connecting terminal (410) and a second connecting terminal (420); wherein the first connecting terminal (410) is electrically connected with the second input terminal (210) entering the third shielding space (331) through the fifth opening (332) and entering the third shielding space (331) through the sixth opening (333), and the third shielding cover (330) shields the electric field generated at the connecting position of the first connecting terminal (410) and the second input terminal (210); the first input terminal (110) enters the first shielding space (311) through the first opening (312); and the first output terminal (120) enters the second shielding space (321) through the third opening (322); the second connecting terminal (420) is electrically connected with the first output terminal (120) entering the second shielding space (321) through the fourth opening (323), so that the first primary winding (100) and the second primary winding (200) are connected in series, and the second shielding cover (320) shields the electric field generated at the connecting position of the second connecting terminal (420) and the first output terminal (120); or the second connecting terminal (420) is electrically connected with the first input terminal (110) entering the first shielding space (311) through the second opening (313), and the second output terminal (220) is electrically connected with the first output terminal (120) entering the second shielding space (321) through the fourth opening (323), so that the first primary winding (100) and the second primary winding (200) are connected in parallel, the first shielding cover (310) shields the electric field generated at the connecting position of the second connecting terminal (420) and the first input terminal (110), and the second shielding cover (320) shields the electric field generated at the connecting position of the second output terminal (220) and the first output terminal (120).

2. The dual-ratio transformer of claim 1, wherein, The first shield (310), the second shield (320) and the third shield (330) respectively comprise a circular ring shield (301), the circular ring shield (301) comprises a plurality of circular rings (302) and a plurality of connecting strips (303), the plurality of circular rings (302) are parallel to each other and equal in size, the axes of the plurality of circular rings (302) coincide, and the connecting strips (303) connect adjacent circular rings (302) in the axial direction of the circular ring shield (301); the circular rings (302) at both ends of the three circular ring shields (301) form the first opening (312) and the second opening (313), the third opening (322) and the fourth opening (323), and the fifth opening (332) and the sixth opening (333) respectively.

3. The dual-ratio transformer of claim 1, wherein, The first shield (310), the second shield (320) and the third shield (330) respectively comprise a spiral shield (304), the spiral shield (304) is spiral along the reference line; the two ends of the three spiral shields (304) have the first opening (312) and the second opening (313), the third opening (322) and the fourth opening (323), and the fifth opening (332) and the sixth opening (333) respectively.

4. The dual-ratio transformer of claim 1, wherein, The first shield (310), the second shield (320) and the third shield (330) respectively comprise a cylindrical shield (305); the two ends of the three cylindrical shields (305) have the first opening (312) and the second opening (313), the third opening (322) and the fourth opening (323), and the fifth opening (332) and the sixth opening (333) respectively.

5. The dual-ratio transformer of any one of claims 1 to 4, wherein, The first shield (310), the second shield (320) and the third shield (330) respectively comprise an aluminum alloy shield.

6. The dual-ratio transformer of any one of claims 1 to 4, wherein, The first shield (310), the second shield (320) and the third shield (330) respectively comprise a copper shield.

7. The dual-ratio transformer of claim 1, wherein, The connecting line (400) comprises a copper conductor, and the two ends of the copper conductor are the first connecting head (410) and the second connecting head (420) respectively.

8. The dual-ratio transformer of claim 1, wherein, The first primary winding (100) and the second primary winding (200) have the same number of turns.

9. The dual-ratio transformer of claim 1, wherein, The double-ratio transformer comprises three phases, wherein each phase comprises the first primary winding (100), the second primary winding (200), the first shield (310), the second shield (320), the third shield (330) and the connecting line (400) respectively.

10. The dual-ratio transformer of claim 1, wherein, The input voltage of the double-ratio transformer is 110 kilovolts or 220 kilovolts.

11. The dual-ratio transformer of claim 1, wherein, The double-ratio transformer is a step-down transformer.

12. The dual-ratio transformer of claim 1, wherein, The double-ratio transformer further comprises a first voltage regulating winding (510) and a second voltage regulating winding (520), the first voltage regulating winding (510) being in series with the first primary winding (100), the second voltage regulating winding (520) being in series with the second primary winding (200).

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