Axial double-split dry-type transformer

Abstract

The application discloses an axial double-split dry-type transformer, which comprises a high-voltage winding and a low-voltage winding, wherein the high-voltage winding and the low-voltage winding are both provided with an upper winding and a lower winding which are axially split; a plurality of first bosses are arranged on the upper end of the upper winding along a circumference, a metal voltage-sharing pad is embedded in the boss, and the boss is compressed by a compression part of an upper clamp of the transformer; a plurality of second bosses are arranged on the lower end of the lower winding along a circumference, a fastener is embedded in the second boss, and the fastener is fixed in a lower clamp of the transformer. The axial double-split dry-type transformer is provided with integrated positioning and compression bosses which are cast on the winding, thereby replacing the upper compression block and the lower pad block of a similar conventional dry-type transformer, and the axial double-split dry-type transformer has the advantages of simple structure, easier body assembly, more stable winding fixation and effectively improved short-circuit resistance.

Description

Technical Field

[0001] This invention relates to an axially double-split dry-type transformer, belonging to the technical field of dry-type transformers. Background Technology

[0002] Axially split dry-type transformers are commonly used in photovoltaic power generation, wind power generation, and subway traction power distribution, and are mainly epoxy-cast encapsulated dry-type transformers. This type of transformer uses an axially split structure, with each phase coil placed vertically; that is, the high-voltage coil and the low-voltage coil are each split into two coils, resulting in a three-phase transformer with 4 × 3 phases = 12 coils, making assembly complex. Furthermore, this type of transformer requires high short-circuit withstand capability, making coil clamping and securing crucial. Common clamping devices often loosen after transportation and hoisting. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide an axial double-split dry-type transformer.

[0004] To solve the above technical problems, the present invention provides an axially double-split dry-type transformer, comprising: a high-voltage winding and a low-voltage winding, wherein both the high-voltage winding and the low-voltage winding have an axially split upper winding and a lower winding.

[0005] The upper end of the upper winding is provided with several first protrusions along the circumference. The protrusions are embedded with metal pressure equalizing pads and are pressed by the clamping parts of the upper clamp of the transformer.

[0006] The lower end of the lower winding is provided with several second protrusions along the circumference. The second protrusions are embedded with fasteners and are fixed in the lower clamp of the transformer by the fasteners.

[0007] Furthermore, the first boss and the upper winding coil are integrally cast and formed.

[0008] Furthermore, the clamping element is a clamping pin.

[0009] Furthermore, the fastener is a metal bolt.

[0010] Furthermore, the upper winding and the lower winding are integrally cast into a single winding.

[0011] Furthermore, the upper winding and the lower winding are cast separately, and the lower end face of the upper winding and the upper end face of the lower winding are coupled together.

[0012] Furthermore, the lower end face of the upper winding is provided with a coupling groove, and the upper end face of the lower winding is provided with a coupling boss corresponding to the coupling groove.

[0013] Furthermore, an intermediate pad is provided at the junction of the coupling groove and the coupling boss.

[0014] Furthermore, the intermediate pad includes a hard pad, a soft pad, and a pin. Two soft pads are fixed on the upper and lower sides of the hard pad. The pin passes through the hard pad and the soft pad and is fixedly connected to the hard pad and the soft pad. The pin is also used to be inserted into the winding air passage during winding assembly.

[0015] The beneficial effects achieved by this invention are as follows:

[0016] This invention provides an integrated cast positioning and clamping boss on the winding of an axial double-split dry-type transformer, which replaces the upper pressure block and lower pad block of a traditional dry-type transformer. It has the advantages of simple structure, easier assembly of transformer body, more stable winding fixation, and effectively improves the short-circuit resistance of this type of product. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the high-voltage winding according to an embodiment of the present invention;

[0018] Figure 2 This is a top view of the high-voltage winding according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the intermediate pad block according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the integral casting of the axial split winding according to an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the low-voltage winding according to an embodiment of the present invention.

[0022] In the figure, 1 is the high-voltage upper winding; 2 is the high-voltage lower winding; 1-1 is the high-voltage upper winding boss; 1-2 is the first equalizing pad; 1-3 is the first coupling groove; 2-1 is the high-voltage lower winding boss; 2-2 is the first positioning bolt; 2-3 is the first coupling boss; 3 is the first intermediate pad; 3-1 is the hard pad; 3-2 is the soft pad; 3-3 is the pin; 4 is the low-voltage upper winding; 5 is the low-voltage lower winding; 4-1 is the low-voltage upper winding boss; 4-2 is the equalizing pad; 4-3 is the second coupling groove; 5-1 is the low-voltage lower winding boss; 5-2 is the second positioning bolt; 5-3 is the second coupling boss; 6 is the second intermediate pad. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0024] like Figure 1 The present invention discloses an axial double-split transformer high-voltage winding, which includes two windings: a high-voltage upper winding 1 and a high-voltage lower winding 2 distributed along the axial direction.

[0025] Furthermore, such as Figure 1 and Figure 2 The high-voltage upper winding 1 has four high-voltage upper winding bosses 1-1 along its circumference at its upper end. The high-voltage upper winding bosses 1-1 are integrally cast with the wire turns, and a first equalizing pad 1-2 made of metal is embedded in the upper surface of the high-voltage upper winding bosses 1-1. The high-voltage upper winding bosses 1-1 of the high-voltage upper winding 1 are pressed together by the pressure pins of the transformer upper clamp, which plays a similar role to the upper pressure block used in traditional dry transformers, thereby pressing the winding together.

[0026] like Figure 1 The high-voltage lower winding 2 has four high-voltage lower winding bosses 2-1 along its lower circumference. These bosses 2-1 are integrally cast with the winding coils, and a first metal positioning bolt 2-2 is embedded in the lower end face of each boss 2-1. The high-voltage lower winding bosses 2-1 are fixed to the lower clamp of the transformer by the second positioning bolts 2-2, functioning similarly to the lower pad used in traditional dry-type transformers, thereby locking and fixing the winding.

[0027] As a preferred option, such as Figure 1 The high-voltage upper winding 1 and high-voltage lower winding 2 of the aforementioned high-voltage winding can be cast into two windings respectively. Four first coupling grooves 1-3 arranged circumferentially are provided on the lower end face of the high-voltage upper winding 1, and first coupling bosses 2-3 corresponding to the first coupling grooves 1-3 are provided on the upper end face of the high-voltage lower winding 2. This serves both to connect with each other and to effectively prevent lateral displacement of the windings.

[0028] Specifically, a first intermediate pad 3 is provided at the junction of the first coupling groove 1-3 and the first coupling boss 2-3. For example... Figure 3 As shown, the first intermediate pad 3 is composed of a hard pad 3-1, a soft pad 3-2, and a pin 3-3. When assembling the winding, the pin 3-3 is inserted into the winding air passage to play a positioning and shock absorption role.

[0029] As a preferred option, such as Figure 4 Alternatively, the high-voltage upper winding 1 and the high-voltage lower winding 2 can be cast into a single integral winding.

[0030] Furthermore, such as Figure 2 and 5The axially split low-voltage winding can also contain two windings: a low-voltage upper winding 4 and a low-voltage lower winding 5 distributed axially. The low-voltage upper winding 4 has four low-voltage upper winding bosses 4-1 along its upper circumference. These bosses 4-1 are integrally cast with the coil, and a metal equalizing pad 4-2 is embedded in the upper surface of each boss 4-1. The high-voltage upper winding bosses 4-1 of the low-voltage upper winding 4 are pressed together by pressure pins on the transformer's upper clamps, functioning similarly to the upper pressure block used in traditional dry-type transformers, thereby pressing the winding together. The low-voltage lower winding 5 has four low-voltage lower winding bosses 5-1 along its lower circumference. These bosses 5-1 are integrally cast with the coil, and a metal second positioning bolt 5-2 is embedded in the lower surface of each boss 5-1. The low-voltage lower winding boss 5-1 of the low-voltage lower winding 5 is fixed to the lower clamp of the transformer by the second positioning bolt 5-2, serving a similar function to the lower pad used in traditional dry transformers, thereby locking and fixing the winding. Four circumferentially arranged coupling grooves 4-3 are provided on the lower end face of the low-voltage upper winding 4, and a second coupling boss 5-3 corresponding to the second coupling grooves 4-3 is provided on the upper end face of the low-voltage lower winding 5. This serves both as a mating mechanism and effectively prevents lateral displacement of the winding. A second intermediate pad 6 is provided at the junction of the second coupling groove 4-3 and the second coupling boss 5-3, serving a positioning and vibration damping function.

[0031] In summary, by setting integrated cast positioning and clamping bosses on the windings of axial double-split dry-type transformers, the positioning and clamping bosses replace the upper pressure blocks and lower pads of traditional dry-type transformers. This results in a simpler structure, easier assembly of the transformer body, more stable winding fixation, and effectively improved short-circuit withstand capability of this type of product.

[0032] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An axially double-split dry-type transformer, characterized in that, include: High-voltage winding and low-voltage winding, both of which have axially split upper and lower windings; The upper end of the upper winding is provided with several first protrusions along the circumference. The protrusions are embedded with metal pressure equalizing pads and are pressed by the clamping parts of the upper clamp of the transformer. The lower end of the lower winding is provided with several second protrusions along the circumference. Fasteners are embedded in the second protrusions and are fixed in the lower clamp of the transformer by the fasteners. The upper winding and the lower winding are cast separately, and the lower end face of the upper winding and the upper end face of the lower winding are coupled together. The lower end face of the upper winding is provided with a coupling groove, and the upper end face of the lower winding is provided with a coupling boss corresponding to the coupling groove; An intermediate pad is provided at the junction of the coupling groove and the coupling boss.

2. The axially double-split dry-type transformer according to claim 1, characterized in that, The first boss and the upper winding are integrally cast.

3. The axially double-split dry-type transformer according to claim 1, characterized in that, The clamping element is a clamping pin.

4. The axially double-split dry-type transformer according to claim 1, characterized in that, The fastener is a metal bolt.

5. The axially double-split dry-type transformer according to claim 1, characterized in that, The upper and lower windings are cast together as a single integral winding.

6. The axially double-split dry-type transformer according to claim 1, characterized in that, The intermediate pad includes a hard pad, a soft pad, and a pin. Two soft pads are fixed on the upper and lower sides of the hard pad. The pin passes through the hard pad and the soft pad and is fixedly connected to the hard pad and the soft pad. The pin is also used to be inserted into the winding air passage during winding assembly.

Images