CN-115863017-B - Axial double-split dry-type transformer

CN115863017BCN 115863017 BCN115863017 BCN 115863017BCN-115863017-B

Abstract

The invention 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 provided with an upper winding and a lower winding which are axially split, a plurality of first bosses are arranged at the upper end part of the upper winding along the circumference, metal voltage-equalizing base plates are embedded in the bosses, the bosses are tightly pressed by a pressing piece of an upper clamping piece of the transformer, a plurality of second bosses are arranged at the lower end part of the lower winding along the circumference, and fastening pieces are embedded in the second bosses and are fixed in the lower clamping piece of the transformer by the fastening pieces. The axial double-split dry type transformer has the advantages that the integrally cast positioning and pressing boss is arranged on the winding of the axial double-split dry type transformer, so that the axial double-split dry type transformer has the functions of replacing an upper pressing block and a lower cushion block of a traditional dry type transformer, has a simple structure, is easier to assemble, is more stable in winding fixation, and effectively improves the short circuit resistance of the product.

Inventors

ZHANG ZHILI
WU BIN
MA SINING
CAI LONG
LI FENGPAN
SHEN SHANLIN
SHAO CHUANYI
SONG YUNXIANG
XING JUN
PAN MING
GU XIAOHU
YANG QINGFU
ZHANG XIAOTONG

Assignees

上海置信电气有限公司

Dates

Publication Date: 20260505
Application Date: 20220921

Claims (6)

1. The axial double-split dry-type transformer is characterized by comprising a high-voltage winding and a low-voltage winding, wherein the high-voltage winding and the low-voltage winding are provided with an upper winding and a lower winding which are axially split; the upper end part of the upper winding is provided with a plurality of first bosses along the circumference, each boss is embedded with a metal equalizing base plate, and the bosses are tightly pressed by a pressing piece of an upper clamping piece of the transformer; The lower end part of the lower winding is provided with a plurality of second bosses along the circumference, and the second bosses are embedded with fasteners which are fixed in a lower clamping piece of the transformer; The upper winding and the lower winding are cast separately, and the lower end face of the upper winding is coupled with the upper end face of the lower winding; 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; And an intermediate cushion block is arranged at the joint of the coupling groove and the coupling boss.
2. The axial double split dry transformer of claim 1, wherein the first boss is integrally cast with the turns of the upper winding.
3. The axial double split dry transformer of claim 1, wherein the compression member is a compression pin.
4. The axial double split dry transformer of claim 1, wherein the fastener is a metal bolt.
5. The axial double split dry transformer of claim 1, wherein the upper winding and the lower winding are integrally cast as one integral winding.
6. The axial double split dry transformer of claim 1, wherein the middle spacer comprises a hard spacer, a soft spacer and pins, the two soft spacers are fixed on the upper side and the lower side of the hard spacer, the pins penetrate through the hard spacer and the soft spacer and are fixedly connected with the hard spacer and the soft spacer, and the pins are also used for being inserted into a winding air passage during winding assembly.

Description

Axial double-split dry-type transformer Technical Field The invention relates to an axial double-split dry-type transformer, and belongs to the technical field of dry-type transformers. Background The axial double-split dry type transformer is commonly used in photovoltaic power generation, wind power generation, subway traction power distribution and other places, and mainly is an epoxy casting encapsulation type dry type transformer. The transformer structurally adopts an axial splitting mode, each phase coil is placed up and down, namely a high-voltage coil and a low-voltage coil are split into 2 coils respectively, the three-phase transformer has 4 multiplied by 3 phases=12 coils, the transformer body is complex to assemble, the short circuit resistance requirement of the transformer is high, the compression and fixation of the coils are important, and a common cushion block compression device is usually loosened after transportation and hoisting. Disclosure of Invention The invention aims to overcome the defects of the prior art and provide an axial double-split dry-type transformer. In order to solve the technical problems, the invention provides 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 provided with an upper winding and a lower winding which are axially split; the upper end part of the upper winding is provided with a plurality of first bosses along the circumference, each boss is embedded with a metal equalizing base plate, and the bosses are tightly pressed by a pressing piece of an upper clamping piece of the transformer; the lower end part of the lower winding is provided with a plurality of second bosses along the circumference, and the second bosses are embedded with fasteners which are fixed in a lower clamping piece of the transformer. Further, the first boss and the wire turns of the upper winding are integrally cast and molded. Further, the pressing piece is a pressing nail. Further, the fastener is a metal bolt. Further, the upper winding and the lower winding are integrally cast into a whole winding. Further, the upper winding and the lower winding are cast separately, and the lower end face of the upper winding is coupled with the upper end face of the lower winding. Further, a coupling groove is formed in the lower end face of the upper winding, and a coupling boss corresponding to the coupling groove is arranged on the upper end face of the lower winding. Further, a middle cushion block is arranged at the joint of the coupling groove and the coupling boss. The middle cushion block comprises a hard cushion block, a soft cushion block and pins, wherein the two cushion blocks are fixed on the upper side and the lower side of the hard cushion block, the pins penetrate through the hard cushion block and the soft cushion block and are fixedly connected with the hard cushion block and the soft cushion block, and the pins are also used for being inserted into a winding air passage during winding assembly. The invention has the beneficial effects that: the invention has the advantages that the integrally poured positioning and pressing boss is arranged on the winding of the axial double-split dry type transformer, the functions of replacing an upper pressing block and a lower cushion block similar to the traditional dry type transformer are realized, the structure is simple, the assembly of the transformer body is easier, the winding is fixed more stably, and the short circuit resistance of the product is effectively improved. Drawings FIG. 1 is a schematic diagram of a high voltage winding according to an embodiment of the present invention; FIG. 2 is a top view of a high voltage winding according to an embodiment of the present invention; FIG. 3 is a schematic diagram of an intermediate pad according to an embodiment of the present invention; FIG. 4 is an illustration of an integral casting intent of an axially split winding in accordance with an embodiment of the present invention; fig. 5 is a schematic diagram of a low voltage winding according to an embodiment of the present invention. In the figure, 1 high-voltage winding, 2 high-voltage winding, 1-1 high-voltage winding boss, 1-2 first equalizing pad, 1-3 first coupling groove, 2-1 high-voltage winding boss, 2-2 first positioning bolt, 2-3 first coupling boss, 3 first middle pad, 3-1 hard pad, 3-2 soft pad, 3-3 pin, 4 low-voltage winding, 5 low-voltage winding, 4-1 low-voltage winding boss, 4-2 equalizing pad, 4-3 second coupling groove, 5-1 low-voltage winding boss, 5-2 second positioning bolt, 5-3 second coupling boss and 6 second middle pad. Detailed Description The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the pr