CN-122000175-A - Oil flow guiding structure, cooling device and transformer coil

CN122000175ACN 122000175 ACN122000175 ACN 122000175ACN-122000175-A

Abstract

The application relates to an oil flow guiding structure, a cooling device and a transformer coil, which are applied to the field of oil immersed transformers. The oil guiding support bars can extend along a first direction and are attached to at least one side wall of a coil of the transformer, an oil guiding cavity is formed in each oil guiding support bar, an oil inlet used for inputting cooled insulating oil is formed in an oil inlet end of each oil guiding support bar, an oil outlet is formed in one side, close to the closed end, of the surface of each oil guiding support bar, and the oil outlet is used for conveying oil in the oil guiding cavity to an upper coil of the transformer. The cooling device utilizes the semiconductor refrigerating sheet to generate cooled insulating oil, the cooled insulating oil is input into the oil guide cavity from the oil inlet and is conveyed to a hot spot area of an upper coil of the transformer through the oil outlet communicated with the oil guide cavity, so that the cooled insulating oil is mixed with oil flow flowing in the upper coil, the average temperature of the oil flow is reduced, the oil flow is increased, and the heat dissipation capacity of the hot spot area of the upper coil of the coil is enhanced.

Inventors

MA XINZHONG
WANG LIANZHI
YU SHUI
YANG SHOUHUI
HUANG YUZHOU
XIAO WEIJIANG
WANG XINYUAN

Assignees

特变电工股份有限公司
特变电工电气装备集团有限公司

Dates

Publication Date: 20260508
Application Date: 20241031

Claims (10)

1. An oil flow guiding structure for delivering cooled insulating oil to a coil of a transformer, the oil flow guiding structure comprising a plurality of oil guiding struts capable of extending in a first direction and being attached to at least one side wall of the coil of the transformer; the oil guiding support rod is internally provided with an oil guiding cavity, the oil guiding support rod comprises an oil inlet end and a closed end which are oppositely arranged along the first direction, the oil inlet end is provided with an oil inlet for inputting cooled insulating oil into the oil guiding cavity, the closed end is of a closed structure, one side, close to the closed end, of the surface of the oil guiding support rod is provided with an oil outlet, and the oil outlet is used for conveying oil in the oil guiding cavity to an upper area of a transformer coil.
2. The oil flow guiding structure according to claim 1, wherein a plurality of the oil outlets are provided, and all the oil outlets are arranged in an array on a side of the oil guiding stay close to the closed end.
3. A cooling device for insulating oil, characterized by comprising: a heat exchange structure installed in the oil tank filled with insulating oil and used for cooling the insulating oil, and The oil flow guiding structure according to any one of claims 1-2, mounted in said oil tank and communicating with said heat exchange structure.
4. A cooling device according to claim 3, wherein the heat exchange structure comprises a housing, a partition plate provided in the housing and dividing the housing interior space into an external heat release chamber and an internal heat release chamber, and a cooling member mounted to the partition plate for absorbing and releasing heat in the internal heat release chamber to the external heat release chamber.
5. The cooling device according to claim 4, wherein the cooling member includes a dc power outlet and a plurality of semiconductor cooling fins connected in series to the dc power outlet, the dc power outlet is configured to be connected to a dc power source, a surface of the semiconductor cooling fin facing the external heat release chamber is a heat release surface, a surface of the semiconductor cooling fin facing the internal heat release chamber is a heat release surface, and when the semiconductor cooling fin is energized, heat absorbed by the heat release surface can be transferred to the heat release surface.
6. The cooling apparatus of claim 4, wherein the heat exchange structure further comprises a first oil feed pump, a second oil feed pump, a cold oil output pipe, and a hot oil output pipe mounted to the housing; The first oil inlet pump is used for pumping insulating oil in the oil tank to the inner heat absorption chamber, the cold oil output pipe is used for communicating the inner heat absorption chamber with the oil flow guiding structure, the second oil inlet pump is used for pumping insulating oil in the oil tank to the outer heat release chamber, and the hot oil output pipe is used for conveying the insulating oil in the outer heat release chamber to the upper part of the oil tank.
7. A transformer coil, comprising: The coil structure comprises an inner paper tube, an insulating inner stay, a coil, an insulating outer stay and an outer paper tube which are sequentially sleeved from inside to outside; The cooling device according to any one of claims 4 to 6, wherein at least one of the insulating inner stay and the insulating outer stay is the oil guide stay, and The oil guide structure is arranged in the coil, forms an oil duct with the inner paper cylinder and the outer paper cylinder, and is used for conveying insulating oil.
8. The transformer coil of claim 7, wherein the insulating outer struts are provided in plurality and are arranged at intervals along the circumferential direction of the outer paper tube.
9. The transformer coil of claim 7, wherein the insulating inner struts are provided in plurality and are arranged at intervals along the circumferential direction of the inner paper tube.
10. The transformer coil of claim 7, wherein the oil guiding structure comprises a plurality of oil baffles penetrating through the coil, two adjacent oil baffles are alternately arranged left and right, one oil baffle is connected to the inner paper cylinder, the other oil baffle is correspondingly connected to the outer paper cylinder, the oil passage is formed among the inner paper cylinder, the outer paper cylinder and the oil baffles, and the oil passage is arranged in an S shape.

Description

Oil flow guiding structure, cooling device and transformer coil Technical Field The application relates to the technical field of oil immersed transformers, in particular to an oil flow guiding structure, a cooling device and a transformer coil. Background With the development of economy, the capacity requirements of transformers are increasing, which does present a series of technical challenges, in particular in terms of heat loss of the coils and temperature rise control of the hottest areas of the coils. With the rise of the temperature of the transformer coil, the insulation life, the stability of the insulation oil performance and the operation safety of the transformer coil are affected to a certain extent. In the related art, an oil immersed transformer coil is cooled through insulating oil, and the insulating oil exchanges heat with the transformer coil when flowing through an insulating oil duct, so that heat of the transformer coil is taken away, and cooling and heat dissipation operations of the transformer coil are realized. However, the insulation oil of the existing oil circuit structure flows through the whole coil, so that the oil at the upper part of the coil is heated by the lower part, the oil temperature is increased, the heat dissipation of the upper coil is affected, and meanwhile, the heat generated by a lead wire caused by a leakage magnetic field of the upper coil is more serious, so that the insulation life and the operation safety of the coil are seriously affected. Disclosure of Invention Based on this, it is necessary to provide an oil flow guiding structure, a cooling device and a transformer coil for solving the problems that in the conventional oil path structure, insulating oil flows through the whole coil, the insulating oil flowing through the upper part of the coil is heated by the lower part, the oil temperature is raised, the heat dissipation and the insulating life of the upper coil are affected, and the operation safety is improved. In a first aspect, the present application provides an oil flow guiding structure, which adopts the following technical scheme: The oil flow guiding structure comprises a plurality of oil guiding struts which can extend along a first direction and are attached to at least one side wall of a coil of the transformer, wherein an oil guiding cavity is arranged in the oil guiding struts, the oil guiding struts comprise an oil inlet end and a closed end which are oppositely arranged along the first direction, the oil inlet end is provided with an oil inlet for inputting cooled insulating oil into the oil guiding cavity, the closed end is of a closed structure, an oil outlet is arranged on one side, close to the closed end, of the surface of the oil guiding struts, and the oil outlet is used for conveying oil in the oil guiding cavity to an upper area of the coil of the transformer. In one embodiment, the plurality of oil outlets are arranged, all the oil outlets are arranged on one side of the oil guide stay close to the closed end, and all the oil outlets are arranged in an array mode. In a second aspect, the present application provides a cooling device, which adopts the following technical scheme: The cooling device comprises a heat exchange structure and the oil flow guiding structure, wherein the heat exchange structure is arranged in an oil tank filled with insulating oil and used for cooling the insulating oil, and the oil flow guiding structure is arranged in the oil tank and communicated with the heat exchange structure. In one embodiment, the heat exchange structure comprises a shell, a partition plate and a refrigerating piece, wherein the partition plate is arranged in the shell and divides the internal space of the shell into an external heat release chamber and an internal heat release chamber, and the refrigerating piece is arranged on the partition plate and is used for absorbing and releasing heat in the internal heat release chamber to the external heat release chamber. In one embodiment, the refrigerating piece comprises a direct-current power socket and a plurality of semiconductor refrigerating pieces connected in series with the direct-current power socket, the direct-current power socket is used for being connected with a direct-current power supply, one surface of the semiconductor refrigerating piece facing the external heat release chamber is a heat release surface, one surface of the semiconductor refrigerating piece facing the internal heat release chamber is a heat release surface, and when the semiconductor refrigerating piece is electrified, heat absorbed by the heat release surface can be transferred to the heat release surface. In one embodiment, the heat exchange structure further comprises a first oil inlet pump, a second oil inlet pump, a cold oil output pipe and a hot oil output pipe, wherein the first oil inlet pump is arranged on the shell, the first oil inlet pump is used for pumping insulating oil in the