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US 11,309,933 B2Granted
Auto-balancing transformers
AssigneeHitachi Energy Switzerland AG
InventorsParag Upadhyay, Mirrasoul Mousavi
Life of this patent
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Abstract
Auto-balancing transformers are disclosed for balancing a multi-phase electrical system by varying the degree of electromagnetic coupling between primary and secondary windings. The auto-balancing transformer includes a movable armature to selectively couple primary phases with two or fewer phases of the secondary system.
Claims16
A transformer, comprising:
- a first number of primary windings configured to be connected to at least two phases of an electrical system;
- a second number of secondary windings configured to be connected to an electrical load, wherein the second number is less than or equal to the first number;
- a yoke supporting the first number of primary windings and the second number of secondary windings;
- and
- a movable armature to selectively electromagnetically couple the second number of secondary windings to a first winding of the first number of primary windings in response to at least one of an imbalance condition between the phases and a loss of at least one phase of the electrical system while a second winding of the first number of primary windings is disconnected from the electrical system.
2 more elements
A transformer, comprising;
- a yoke;
- a secondary limb and at least two primary limbs peripherally spaced from the secondary limb, the secondary limb and the at least two primary limbs extending from the yoke;
- at least two primary windings configured to be connected to an electrical system extending about respective ones of the at least two primary limbs;
- a secondary winding extending about the secondary limb;
- and
- an armature opposite the yoke and extending outwardly from the secondary limb, the armature being movable to selectively couple the secondary winding with a first winding of the at least two primary windings while a second winding of the at least two primary windings is disconnected from the electrical system.
3 more elements
Dependencies are inferred from the claim text.