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US 11,480,602 B2Granted
Transformer assembly with medium frequency transformers
AssigneeABB Schweiz AG
InventorsUwe Drofenik, Thomas Gradinger, Francisco Canales
Life of this patent
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Abstract
Transformer assembly including a first transformer stage having a plurality of first-stage transformer cells; and a second transformer stage. An input of the second transformer stage is connected to an output of the first transformer stage. A lightning impulse breakdown voltage of a transformer cell of the second stage is at least double of a lightning impulse breakdown voltage of transformer cells of the first stage.
Claims18
A transformer assembly comprising:
- a first transformer stage having a plurality of first-stage transformer cells, each of the first-stage transformer cells comprising a converter and a medium frequency transformer connected in series to each other, wherein the respective inputs of each of the plurality of first-stage transformer cells are connected in series and the respective outputs of each of the plurality first-stage transformer cells are connected in parallel to form the output of the first transformer stage;
- and
- a second transformer stage comprising at least one second-stage transformer cell, the second-stage transformer cell comprising a medium frequency transformer and a converter connected in series to each other, wherein
- a lightning impulse breakdown voltage of the at least one second-stage transformer cell is at least double of a lightning impulse breakdown voltage of one of the first-stage transformer cells, wherein the lightning impulse breakdown voltage is the peak voltage of a lightning impulse between an input and an output of the respective transformer cell, at which the respective transformer cell breaks down during a lightning impulse test, and wherein
- an input of the second transformer stage is connected to the output of the first transformer stage.
2 more elements
A solid state transformer having a transformer assembly, including:
- a first transformer stage having a plurality of first-stage transformer cells, each of the first-stage transformer cells comprising a converter and a medium frequency transformer connected in series to each other, wherein the respective inputs of each of the plurality of first-stage transformer cells are connected in series and the respective outputs of each of the plurality first-stage transformer cells are connected in parallel to form the output of the first transformer stage;
- and
- a second transformer stage comprising at least one second-stage transformer cell, the second-stage transformer cell comprising a medium frequency transformer and a converter connected in series to each other, wherein
- a lightning impulse breakdown voltage of the at least one second-stage transformer cell is at least double of a lightning impulse breakdown voltage of one of the first-stage transformer cells, wherein the lightning impulse breakdown voltage is the peak voltage of a lightning impulse between an input and an output of the respective transformer cell, at which the respective transformer cell breaks down during a lightning impulse test, and wherein
- an input of the second transformer stage is connected to the output of the first transformer stage.
2 more elements
Dependencies are inferred from the claim text.