CN-224217341-U - Three-phase combined transformer

CN224217341UCN 224217341 UCN224217341 UCN 224217341UCN-224217341-U

Abstract

The utility model discloses a three-phase combined transformer, which relates to the technical field of transformers, wherein the three-phase combined transformer comprises a base, a low-voltage outlet device, a neutral point outlet device and three single-phase transformers, wherein the low-voltage outlet device is provided with three low-voltage bushings, the neutral point outlet device is provided with neutral point bushings, each single-phase transformer comprises an oil tank, the three single-phase transformers are arranged on the base at intervals along a second horizontal direction, high-voltage outlet interfaces and neutral point outlet interfaces are respectively arranged on tank walls on two opposite sides of each oil tank along a first horizontal direction, and a top tank wall of each oil tank is provided with a low-voltage outlet interface. The high-voltage outlet interface, the neutral point outlet interface and the low-voltage outlet interface of the single-phase transformer are not mutually interfered and do not affect the interval arrangement of the three single-phase transformers, so that the line crossing condition of the three-phase combined transformer during the outlet is reduced, the wiring is simple, the structure of the three-phase combined transformer is more compact, the layout is reasonable, and the occupied area is effectively saved.

Inventors

YANG LEI
MA YONG
MA WENLU
FAN HEQUN
ZHENG GANG
NIU ZHIXIONG

Assignees

特变电工超高压电气有限公司
特变电工股份有限公司新疆变压器厂

Dates

Publication Date: 20260508
Application Date: 20250409

Claims (10)

1. A three-phase combination transformer, comprising: A base; The low-voltage outlet device is provided with three low-voltage bushings; the neutral point outlet device is provided with a neutral point sleeve; The three single-phase transformers are arranged on the base at intervals along the second horizontal direction, high-voltage outlet interfaces and neutral point outlet interfaces are respectively arranged on tank walls on two opposite sides of each oil tank along the first horizontal direction, and low-voltage outlet interfaces are arranged on top tank walls of each oil tank; The three neutral point outlet interfaces of the three oil tanks are all connected to the neutral point outlet device, and are led out of the three-phase combined transformer through the neutral point bushings together, the three low-voltage outlet interfaces are all connected to the low-voltage outlet device, the three low-voltage bushings are respectively corresponding to the three low-voltage outlet interfaces, and the three low-voltage outlet interfaces are led out of the three-phase combined transformer through the corresponding low-voltage bushings.
2. The three-phase combined transformer of claim 1, wherein the low-voltage outlet device further comprises a housing and copper bars arranged in the housing, each low-voltage bushing is arranged on the housing, three low-voltage connection terminals are respectively arranged on the housing corresponding to the three low-voltage outlet interfaces, the three low-voltage connection terminals are respectively connected with the corresponding low-voltage outlet interfaces, and the copper bars connect each low-voltage connection terminal with the corresponding low-voltage bushing.
3. The three-phase combined transformer according to claim 2, wherein the housing is provided with three independently arranged outlet chambers, two adjacent outlet chambers are separated by an insulating partition plate, three low-voltage bushings are respectively arranged corresponding to the three outlet chambers, and three low-voltage terminals are respectively arranged corresponding to the three outlet chambers.
4. The three-phase combined transformer of claim 2, wherein each of the neutral outlet interfaces is connected to the neutral outlet device by a first flange, and each of the low voltage terminals is connected to the corresponding low voltage outlet interface by a second flange.
5. The three-phase combination transformer of claim 1, wherein the neutral point outlet device further comprises a junction cable and three neutral point connection terminals, the three neutral point connection terminals being connected to the three neutral point outlet interfaces, respectively, the junction cable connecting each of the neutral point connection terminals with the neutral point bushing.
6. The three-phase combined transformer according to any one of claims 1 to 5, wherein the high-voltage outlet, the low-voltage outlet and the neutral outlet are each provided with a sealing gasket.
7. The three-phase combined transformer according to any one of claims 1 to 5, wherein the low-voltage bushing and the neutral point bushing are both ceramic bushings, and an outer surface of the ceramic bushings is coated with an anti-flashover paint.
8. The three-phase combined transformer according to any one of claims 1 to 5, further comprising a cooling device mounted on the base and disposed offset from each of the single-phase transformers, the three single-phase transformers sharing the cooling device.
9. The three-phase combination transformer according to claim 8, wherein the cooling device includes a radiator and a circulation pipe that communicates the radiator and each of the oil tanks as a circulation oil path to radiate heat of the oil body in each of the oil tanks through the radiator.
10. A three-phase combined transformer according to any one of claims 1 to 5, characterized in that the base is a steel base, which is connected to the foundation by means of anchor bolts.

Description

Three-phase combined transformer Technical Field The utility model relates to the technical field of transformers, in particular to a three-phase combined transformer. Background The three-phase combined transformer is usually formed by combining three single-phase transformers, in the existing three-phase combined transformer, a high-voltage outlet interface, a low-voltage outlet interface and a neutral point outlet interface are usually concentrated on the same side of the single-phase transformer, and the concentrated outlet structure leads to mutual cross interference of lines and complex wiring of the three-phase combined transformer when the three-phase combined transformer is used for outgoing lines. In addition, the centralized outgoing line structure can cause interference to the arrangement of three single-phase transformers, and the three single-phase transformers are required to be arranged away from each other in order to avoid the outgoing line structure, so that the length of the three-phase combined transformer in a certain direction is obviously increased, the occupied area of the three-phase combined transformer is increased, and the structure is not compact enough. Disclosure of utility model The utility model mainly aims to provide a three-phase combined transformer, and aims to solve the technical problems that in the prior art, outgoing lines of the three-phase combined transformer are mutually interfered, wiring is complex, occupied area is increased, and the structure is not compact enough. The three-phase combined transformer comprises a base, a low-voltage outlet device, a neutral point outlet device and three single-phase transformers, wherein the low-voltage outlet device is provided with three low-voltage bushings, the neutral point outlet device is provided with neutral point bushings, each single-phase transformer comprises an oil tank, the length direction, the width direction and the height direction of each oil tank are respectively in a first horizontal direction, a second horizontal direction and a vertical direction, the first horizontal direction is perpendicular to the second horizontal direction, the three single-phase transformers are arranged on the base at intervals along the second horizontal direction, high-voltage outlet interfaces and neutral point outlet interfaces are respectively arranged on tank walls of the oil tanks on two sides opposite to the first horizontal direction, the top tank wall of each oil tank is provided with a low-voltage outlet interface, the three neutral point outlet interfaces of each oil tank are respectively connected with the neutral point outlet device and jointly led out of the three-phase combined transformer, the three low-voltage outlet interfaces are respectively corresponding to the low-voltage bushings, and the three low-voltage outlet interfaces are respectively connected with the low-voltage bushings. In an embodiment, the low-voltage outlet device further includes a housing and a copper bar disposed in the housing, each low-voltage sleeve is disposed on the housing, three low-voltage terminals are disposed on the housing corresponding to the three low-voltage outlet interfaces, the three low-voltage terminals are connected to the corresponding low-voltage outlet interfaces, and each low-voltage terminal is connected to the corresponding low-voltage sleeve by the copper bar. In one embodiment, the shell is internally provided with three independently arranged outlet cavities, two adjacent outlet cavities are separated by an insulating partition board, the three low-voltage bushings are respectively arranged corresponding to the three outlet cavities, and the three low-voltage terminals are respectively arranged corresponding to the three outlet cavities. In one embodiment, each of the neutral outlet interfaces is connected to the neutral outlet device through a first flange, and each of the low-voltage terminals is connected to the corresponding low-voltage outlet interface through a second flange. In an embodiment, the neutral point outlet device further includes a connection cable and three neutral point connection terminals, the three neutral point outlet terminals are respectively connected to the three neutral point outlet interfaces, and the connection cable connects each neutral point connection terminal with the neutral point sleeve. In an embodiment, the high-voltage outlet, the low-voltage outlet and the neutral outlet are each provided with a sealing gasket. In one embodiment, the low voltage bushing and the neutral bushing are both ceramic bushings, and the outer surface of the ceramic bushing is coated with an anti-fouling flashover coating. In an embodiment, the three-phase combined transformer further includes a cooling device, and the cooling device is mounted on the base and is arranged in a dislocation manner with each single-phase transformer, and the three single-phase transformers share the cooling devi