CN-224203928-U - Oil immersed transformer

CN224203928UCN 224203928 UCN224203928 UCN 224203928UCN-224203928-U

Abstract

The utility model belongs to the field of transformers, and particularly relates to an oil immersed transformer which comprises a base, an oil tank and a winding assembly, wherein the oil tank comprises a tank bottom, a tank wall, a tank edge and a tank cover, a bending part is arranged on the outer side of the tank cover, a welding part extending out of the tank wall is arranged at the tail part of the bending part, the welding part is welded on the tank edge, a containing space is formed between the outer side of the tank cover and the tank edge, a sealing piece in sealing fit with the tank cover and the tank edge is arranged in the containing space, the sealing piece separates the welding part from hydraulic oil in the oil tank, the sealing piece is made of high-temperature resistant silicone rubber, welding slag can not enter the oil tank during welding, transformer oil can not enter a welding area, acetylene can be separated out from the transformer oil due to high temperature, and the oil-up test qualification rate of the transformer can be ensured.

Inventors

MOU SHUAI
XIANG BINGFU
Jin Xiaoxu
WU LONG
XUE LI
LOU ZHAOHUI
YE QUANTI
SUN LONGYU

Assignees

浙江电力变压器有限公司

Dates

Publication Date: 20260505
Application Date: 20250530

Claims (10)

1. The oil immersed transformer comprises a base, an oil tank arranged on the base and a winding assembly arranged in the oil tank, and is characterized in that the oil tank comprises a tank bottom, a tank wall, a tank edge and a tank cover, a bending part is arranged on the outer side of the tank cover, a welding part extending out of the tank wall is arranged at the tail part of the bending part, the welding part is welded on the tank edge, an accommodating space is formed between the outer side of the tank cover and the tank edge, and sealing elements in sealing fit with the tank cover and the tank edge are arranged in the accommodating space and separate the welding part from hydraulic oil in the oil tank.
2. The oil-immersed transformer of claim 1, wherein the inner side of the tank edge is provided with a limiting part bent and extended into the tank wall, and the accommodating space is formed between the limiting part and the bent part of the tank cover.
3. The oil-immersed transformer of claim 2, wherein the outer side of the tank edge is provided with an outer edge part extending outwards of the tank wall, and the welding part is welded on the outer edge part.
4. The oil-immersed transformer according to claim 3, wherein the width of the outer edge portion is larger than the width of the welded portion.
5. The oil-immersed transformer of claim 1, wherein a plurality of radiating fins are arranged on the outer wall of the tank wall at intervals, and support columns are arranged at two ends of each radiating fin.
6. The oil-immersed transformer of claim 1, wherein the base comprises two supporting plates symmetrically arranged on the bottom of the tank, and reinforcing ribs are arranged on the two supporting plates.
7. The oil-immersed transformer of claim 1, wherein the winding assembly comprises two upper clamping plates, two lower clamping plates, an iron core and three windings, wherein the two upper clamping plates are clamped on two sides of one end of the iron core, a first bolt is connected between the two upper clamping plates, the two lower clamping plates are clamped on two sides of the other end of the iron core, a second bolt is connected between the two lower clamping plates, and the three windings are arranged on the iron core at intervals.
8. The oil-immersed transformer of claim 7, wherein insulating isolation plates are arranged between two adjacent windings corresponding to the two upper clamping plates and the two lower clamping plates.
9. The oil-immersed transformer of claim 8, wherein a plurality of raised lines are distributed on two sides of the insulating isolation plate facing the winding, and flow passages for flowing transformer oil are formed between the raised lines.
10. The oil-immersed transformer of claim 8 or 9, wherein positioning grooves are respectively formed in the two upper clamping plates and the two lower clamping plates at two ends of the corresponding insulating isolation plates, the two ends of the insulating isolation plates are respectively clamped in the positioning grooves, and the insulating isolation plates are clamped and matched with the two upper clamping plates and the two lower clamping plates.

Description

Oil immersed transformer Technical Field The utility model belongs to the technical field of transformers, and particularly relates to an oil immersed transformer. Background An oil immersed transformer is a power transformer using insulating oil as a cooling and insulating medium, and is widely applied to a power system. The oil immersed transformer comprises an iron core, windings, an insulation system, an oil tank and a cooling device. The existing oil tank of the oil immersed transformer is formed by welding a tank bottom, tank walls, tank edges and a tank cover, in the production process, the tank cover and the tank edges are easy to deform, gaps are reserved between the tank cover and the tank edges, welding slag is easy to enter the oil tank during welding, the insulating property of the transformer is reduced, even the transformer is burnt out, and acetylene is separated out from a welding area due to the fact that transformer oil enters the welding area under high temperature, so that the oiling test of the transformer is unqualified. Disclosure of Invention The utility model aims to overcome the defects and the shortcomings of the prior art, and provides an oil immersed transformer which can effectively solve the problem that welding slag enters an oil tank. The oil immersed transformer comprises a base, an oil tank arranged on the base and a winding assembly arranged in the oil tank, wherein the oil tank comprises a tank bottom, a tank wall, a tank edge and a tank cover, a bending part is arranged on the outer side of the tank cover, a welding part extending out of the tank wall is arranged at the tail part of the bending part, the welding part is welded on the tank edge, a containing space is formed between the outer side of the tank cover and the tank edge, and a sealing element in sealing fit with the tank cover and the tank edge is arranged in the containing space and separates the welding part from hydraulic oil in the oil tank. In some embodiments, the inner side of the box edge is provided with a limiting part bent and extended into the box wall, and the accommodating space is formed between the limiting part and the bending part of the box cover. In some embodiments, the outside of the tank rim has an outer rim portion extending outwardly of the tank wall, and the weld is welded to the outer rim portion. In some embodiments, the width of the outer rim is greater than the width of the weld. In some embodiments, a plurality of heat dissipation fins are arranged on the outer wall of the box wall at intervals, and support columns are arranged at two ends of the multi-heat dissipation fins respectively. In some embodiments, the base comprises two supporting plates symmetrically arranged on the bottom of the box, and reinforcing ribs are arranged on the two supporting plates. In some embodiments, the winding assembly include two punch holder, two lower plates, iron core, three winding, two punch holder centre gripping on the both sides of iron core one end, and be connected with first bolt between two punch holder, two lower plates centre gripping on the both sides of the iron core other end, and be connected with the second bolt between two lower plates, three winding interval arrangement set up on the iron core. In some embodiments, an insulating isolation plate is arranged between two adjacent windings corresponding to the two upper clamping plates and the two lower clamping plates. In some embodiments, the insulation isolation board is provided with a plurality of raised strips distributed on two sides facing the winding, and a flow channel for the transformer oil to circulate is formed between the raised strips. In some embodiments, positioning grooves are respectively formed at two ends of the two upper clamping plates and two lower clamping plates, which correspond to the insulating isolation plates, the two ends of the insulating isolation plates are respectively clamped in the positioning grooves, and the insulating isolation plates are matched with the two upper clamping plates and the two lower clamping plates in a clamping way. The utility model has the beneficial effects that the outside of the box cover adopts a bending structure design, a containing space is formed between the bending part of the box cover and the box edge, the containing space is internally provided with the sealing piece, the sealing piece is made of high-temperature resistant silicon rubber, the sealing piece can separate the welding part from hydraulic oil in the oil tank, welding slag cannot enter the oil tank during welding, transformer oil cannot enter the welding area, acetylene precipitation of the transformer oil due to high temperature can be avoided, and the qualification rate of the oiling test of the transformer can be ensured. Drawings In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are required in the descript