Transformer cooling system and transformer installation

Patent metadata

Field	Value
Publication number	US-12308159-B2
Application number	US-201917297690-A
Country	US
Kind code	B2
Filing date	Oct 22, 2019
Priority date	Nov 29, 2018
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

A transformer cooling system is described. The transformer cooling system includes a dry transformer and a housing for the dry transformer. The dry transformer includes a core including a leg. Additionally, the dry transformer includes a winding body arranged around the leg. Further, a cooling channel extending in a direction of a longitudinal axis of the winding body is provided. Additionally, the transformer cooling system includes a heat exchanger adapted to dissipate heat from the housing. Further, the transformer cooling system includes a flow generating device arranged in the housing for providing a cooling flow in the cooling channel. The flow generating device is connected to the heat exchanger.

First claim

The invention claimed is:

1. A transformer cooling system, comprising:
a dry transformer, comprising:
a core comprising a leg,
a winding body arranged around the leg,
a cooling channel extending in a direction of a longitudinal axis of the winding body, the cooling channel being disposed between an inner part of the winding body and an outer part of the winding body, and the cooling channel having a first opening provided at a first end of the cooling channel and a second opening provided at a second end of the cooling channel,

a flow generating device for providing a cooling flow in the cooling channel, the flow generating device being connected to a heat exchanger,
a flow guiding device for guiding the flow generated by the flow generating device to enhance the cooling flow in the cooling channel, the flow guiding device comprising an enclosure containing the flow generating device, the enclosure having an opening towards the cooling channel,
a housing containing the dry transformer, the flow generating device, and the flow guiding device, and
the heat exchanger adapted to dissipate heat from the housing.

2. The transformer cooling system of claim 1 , wherein the flow generating device comprises a first flow generating unit arranged underneath the dry transformer, and wherein the first flow generating unit is connected via a first pipe to a low temperature portion of the heat exchanger.

3. The transformer cooling system of claim 1 , wherein the flow generating device comprises a second flow generating unit arranged above the dry transformer, and wherein the second flow generating unit is connected via a second pipe to a high temperature portion of the heat exchanger.

4. The transformer cooling system of claim 1 , wherein the flow generating device comprises a first flow opening and a second flow opening, wherein the first flow opening is arranged on an opposite side of the core of the dry transformer than the second flow opening.

5. The transformer cooling system of claim 1 , wherein the winding body comprises two winding body segments arranged separately in the longitudinal direction of the leg, each winding body segment having an inner part and an outer part, wherein segment cooling channels are provided there between, and wherein the flow generating device comprises a third flow generating unit is arranged between the two winding body segments.

6. The transformer cooling system of claim 1 , wherein the flow generating device includes at least one element selected from the group consisting of: a fan, a cross-flow fan, a pump, and a pressure chamber.

7. The transformer cooling system of claim 1 , wherein the dry transformer is a three-phase transformer comprising three legs and three windings.

8. A transformer installation, comprising:
first dry transformer and a second dry transformer, each comprising:
a core comprising a leg,
a winding body arranged around the leg, and
a cooling channel in a direction of a longitudinal axis of the winding body, the cooling channel being disposed between an inner part of the winding body and an outer part of the winding body, and the cooling channel having a first opening provided at a first end of the cooling channel and a second opening provided at a second end of the cooling channel,

a first flow generating device for providing a cooling flow in the cooling channel of the first dry transformer, the first flow generating device being connected to the cooling apparatus,
a second flow generating device for providing a cooling flow in the cooling channel of the second dry transformer, the second flow generating device being connected to the cooling apparatus,
a first housing containing the first dry transformer and the first flow generating device,
a second housing containing the second dry transformer and the second flow generating device, and
a cooling apparatus in fluid communication with the first housing and with the second housing, the cooling apparatus being adapted to dissipate heat from the first housing and from the second housing.

9. The transformer installation of claim 8 , wherein the cooling apparatus is a stand-alone heat exchanger or a HVAC (Heating, Ventilation and Air Conditioning) System.

Assignees

• Hitachi Energy Ltd

Inventors

• Wang Yong
• Tepper Jens
• Wu Wei
• Xu Ava-Ye

Classifications

• H01F27/20

  Cooling by special gases or non-ambient air · CPC title

• H01F2027/329

  Insulation with semiconducting layer, e.g. to reduce corona effect · CPC title

• H01F27/322

  the insulation forming channels for circulation of the fluid · CPC title

• H01F27/2876 Primary

  Cooling (cooling transformers and inductances in general H01F27/08) · CPC title

• H01F27/025 Primary

  Constructional details relating to cooling · CPC title