# US 2022/0037079 A1 · Transformer cooling system and transformer installation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0037079 A1 - Document ID: US20220037079A1 - Status: Published application - Kind: A1 - Application number: 17/297,690 - Filed: 2019-10-22 - Published: 2022-02-03 - Earliest claimed: 2018-11-29 - Assignees: ABB Power Grids Switzerland AG - Applicants: ABB Power Grids Switzerland AG - Inventors: Yong Wang; Jens Tepper; Wei Wu; Ava-Ye Xu - Web page: https://patentgrep.com/patent/US20220037079A1 ## CPC - H01F 27/025: {Constructional details relating to cooling} - H01F 27/2876: {Cooling (cooling transformers and inductances in general H01F27/08)} - H01F 27/20: Cooling by special gases or non-ambient air - H01F 27/322: {the insulation forming channels for circulation of the fluid} - H01F 2027/329: {Insulation with semiconducting layer, e.g. to reduce corona effect} - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## 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. ## Claims ### Claim 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, wherein the cooling channel is disposed between an inner part of the winding body and an outer part of the winding body, and wherein the cooling channel has 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 housing (50) for the dry transformer, a heat exchanger adapted to dissipate heat from the housing, a flow generating device arranged in the housing for providing a cooling flow in the cooling channel, wherein the flow generating device is connected to the heat exchanger, and 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 of the flow generating device, the enclosure having an opening towards the cooling channel. ### Claim 2 (depends on 1) 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. ### Claim 3 (depends on 1) 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. ### Claim 4 (depends on 1) 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. ### Claim 5 (canceled) ### Claim 6 (canceled) ### Claim 7 (depends on 1) 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. ### Claim 8 (depends on 1) 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. ### Claim 9 (depends on 1) The transformer cooling system of claim 1, wherein the dry transformer is a three-phase transformer comprising three legs and three windings. ### Claim 10 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 extending in a direction of a longitudinal axis of the winding body, wherein the cooling channel is disposed between an inner part of the winding body and an outer part of the winding body, and wherein the cooling channel has 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 housing for the first dry transformer, a second housing for the second dry transformer, cooling apparatus in fluid communication with the first housing and with the second housing, wherein the cooling apparatus is adapted to dissipate heat from the first housing and from the second housing, wherein a first flow generating device is arranged in the first housing 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, and wherein a second flow generating device is arranged in the second housing 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. ### Claim 11 (depends on 10) The transformer installation of claim 10, wherein the cooling apparatus is a stand-alone heat exchanger or a HVAC (Heating, Ventilation and Air Conditioning) System. ### Claim 12 (canceled)