# US 12,770,771 B2 · Prefabricated transformer station, oil-immersed transformer, and photovoltaic system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,770,771 B2 - Document ID: US12770771B2 - Status: Granted - Kind: B2 - Application number: 18/319,007 - Filed: 2023-05-17 - Published: 2023-09-14 - Granted: 2026-10-20 - Earliest claimed: 2020-11-19 - Assignees: Huawei Digital Power Technologies Co., Ltd. - Applicants: Huawei Digital Power Technologies Co., Ltd. - Inventors: Gewen Wang; Haiyang Pan; Peng Zhou - Web page: https://patentgrep.com/patent/US12770771B2 ## CPC - H01F 27/14: Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling - H01F 27/025: {Constructional details relating to cooling} - H01F 2027/404 - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract A prefabricated transformer station, an oil-immersed transformer, and a photovoltaic system, and relates to the field of power distribution technologies. The prefabricated transformer station includes a container housing and the oil-immersed transformer. A transformer room is provided inside the container housing, and a top cover of the transformer room is opened. The oil-immersed transformer is installed in the transformer room, and a height of a top of an oil conservator of the oil-immersed transformer is higher than a height of a side wall of the transformer room. The prefabricated transformer station can provide more space for a fuel tank, so as to improve a capacity of the oil-immersed transformer. ## Claims ### Claim 1 A prefabricated transformer station, the prefabricated transformer station comprising a container housing and an oil-immersed transformer; a transformer room is provided inside the container housing, and a top cover of the transformer room is opened; and the oil-immersed transformer is installed in the transformer room, and a height of a top of an oil conservator of the oil-immersed transformer is higher than a height of a side wall of the transformer room, wherein the oil conservator further comprises a capsule, an air tube, and an oil conservator body, and the prefabricated transformer station further comprises a moisture absorber; the oil conservator body is filled with the transformer oil and the capsule; the capsule is connected to the moisture absorber outside the oil conservator body through the air tube; and the moisture absorber is configured to maintain a balance between pressure of the oil conservator and a fuel tank and outside pressure. ### Claim 2 (depends on 1) The prefabricated transformer station according to claim 1, wherein the fuel tank and the oil conservator are connected through a pipe, and a gas relay is disposed on the pipe; and the gas relay is configured to: when an internal fault occurs in the oil-immersed transformer, generate an alarm or cut off the oil-immersed transformer. ### Claim 3 (depends on 2) The prefabricated transformer station according to claim 2, further comprising: a first butterfly valve; a second butterfly valve; and a third butterfly valve, wherein the pipe further comprises a first pipe and a second pipe; the first butterfly valve is connected between a port on a fuel tank side of the gas relay and a first end of the first pipe, and a second end of the first pipe is connected to the fuel tank; the second butterfly valve is connected between a port on an oil conservator side of the gas relay and a first end of the third butterfly valve, a second end of the third butterfly valve is connected to a first end of the second pipe, and a second end of the second pipe is connected to the oil conservator; and the first butterfly valve, the second butterfly valve, and the third butterfly valve are configured to avoid transformer oil leakage of the oil-immersed transformer when being closed, to enable the second butterfly valve and the third butterfly valve to be disconnected. ### Claim 4 (depends on 1) The prefabricated transformer station according to claim 1, wherein a base and a grid door of the transformer room are provided with air holes. ### Claim 5 (depends on 1) The prefabricated transformer station according to claim 1, wherein a medium voltage used for the prefabricated transformer station ranges from 10 kV to 35 kV. ### Claim 6 (depends on 1) The prefabricated transformer station according to claim 1, wherein a low voltage used for the prefabricated transformer station ranges from 0.4 kV to 1.5 kV. ### Claim 7 (depends on 1) The prefabricated transformer station according to claim 1, wherein a specification for the container housing is a 20-foot marine container. ### Claim 8 (depends on 1) The prefabricated transformer station according to claim 1, wherein the oil conservator and the fuel tank of the oil-immersed transformer are connected by using a bracket. ### Claim 9 (depends on 1) The prefabricated transformer station according to claim 1, wherein a height of a bottom of the oil conservator is higher than the height of the side wall of the transformer room. ### Claim 10 An oil-immersed transformer, used in a prefabricated transformer station, the prefabricated transformer station comprising a container housing, a transformer room configured to install the oil-immersed transformer is provided inside the container housing, and the oil-immersed transformer comprises a fuel tank and an oil conservator; and the oil conservator is disposed above the fuel tank, and a height of a top of the oil conservator is higher than a height of a side wall of the transformer room, wherein the oil conservator further comprises a capsule, an air tube, and an oil conservator body, and the prefabricated transformer station further comprises a moisture absorber; the oil conservator body is filled with the transformer oil and the capsule; the capsule is connected to the moisture absorber outside the oil conservator body through the air tube; and the moisture absorber is configured to maintain a balance between pressure of the oil conservator and the fuel tank and outside pressure. ### Claim 11 (depends on 10) The oil-immersed transformer according to claim 10, wherein the fuel tank and the oil conservator are connected through a pipe, and a gas relay is disposed on the pipe; and the gas relay is configured to: when an internal fault occurs in the oil-immersed transformer, generate an alarm or cut off the oil-immersed transformer. ### Claim 12 (depends on 11) The oil-immersed transformer according to claim 11, wherein the prefabricated transformer station further comprises a first butterfly valve, a second butterfly valve, and a third butterfly valve, and the pipe comprises a first pipe and a second pipe; the first butterfly valve is connected between a port on a fuel tank side of the gas relay and a first end of the first pipe, and a second end of the first pipe is connected to the fuel tank; the second butterfly valve is connected between a port on an oil conservator side of the gas relay and a first end of the third butterfly valve, a second end of the third butterfly valve is connected to a first end of the second pipe, and a second end of the second pipe is connected to the oil conservator; and the first butterfly valve, the second butterfly valve, and the third butterfly valve are configured to avoid transformer oil leakage of the oil-immersed transformer when being closed, to enable the second butterfly valve and the third butterfly valve to be disconnected. ### Claim 13 (depends on 10) The oil-immersed transformer according to a claim 10, wherein the oil conservator and the fuel tank of the oil-immersed transformer are connected by using a bracket. ### Claim 14 A photovoltaic system, wherein the photovoltaic system comprises a prefabricated transformer station and a photovoltaic inverter; and the prefabricated transformer station comprising a container housing and an oil-immersed transformer; a transformer room is provided inside the container housing, and a top cover of the transformer room is opened; and the oil-immersed transformer is installed in the transformer room, and a height of a top of an oil conservator of the oil-immersed transformer is higher than a height of a side wall of the transformer room; and the photovoltaic inverter is configured to convert a direct current into an alternating current and then transmit the alternating current to the prefabricated transformer station, wherein the oil conservator further comprises a capsule, an air tube, and an oil conservator body, and the prefabricated transformer station further comprises a moisture absorber; the oil conservator body is filled with the transformer oil and the capsule; the capsule is connected to the moisture absorber outside the oil conservator body through the air tube; and the moisture absorber is configured to maintain a balance between pressure of the oil conservator and a fuel tank and outside pressure. ### Claim 15 (depends on 14) The photovoltaic system according to claim 14, wherein the photovoltaic inverter is a string inverter or a central inverter. ### Claim 16 (depends on 15) The photovoltaic system according to claim 15, wherein the fuel tank and the oil conservator are connected through a pipe, and a gas relay is disposed on the pipe; and the gas relay is configured to: when an internal fault occurs in the oil-immersed transformer, generate an alarm or cut off the oil-immersed transformer. ### Claim 17 (depends on 16) The photovoltaic system according to claim 16, wherein the prefabricated transformer station further comprises a first butterfly valve, a second butterfly valve, and a third butterfly valve, and the pipe comprises a first pipe and a second pipe; the first butterfly valve is connected between a port on a fuel tank side of the gas relay and a first end of the first pipe, and a second end of the first pipe is connected to the fuel tank; the second butterfly valve is connected between a port on an oil conservator side of the gas relay and a first end of the third butterfly valve, a second end of the third butterfly valve is connected to a first end of the second pipe, and a second end of the second pipe is connected to the oil conservator; and the first butterfly valve, the second butterfly valve, and the third butterfly valve are configured to avoid transformer oil leakage of the oil-immersed transformer when being closed, to enable the second butterfly valve and the third butterfly valve to be disconnected.