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US 2018/0006679 A1Published application
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 winding. The auto-balancing transformer includes a movable to selectively couple primary phases with two or fewer phases of the secondary system.
Claims25
A transformer, comprising:
- a first number of primary windings connectable to at least two phases of an electrical system;
- a second number of secondary windings correctable 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 one or more 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.
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 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 one or more of the at least two primary windings.
3 more elements
A transformer, comprising:
- a stator;
- a plurality of primary windings distributed about the stator wherein the plurality of primary windings provide three phases;
- a movable armature within the stator;
- and
- a secondary winding wound around the armature, wherein the armature is movable to selectively couple the secondary winding with a selected one of the three phases.
2 more elements
A method, comprising:
- detecting at least one of an unbalanced condition and a loss of supply on a phase of a multi-phase electrical system, wherein the phase is connectable to a load via at least one primary winding and at least one secondary winding;
- and
- moving an armature of an auto-balancing transformer to couple the at least one secondary winding to another phase of the multi-phase electrical system in response to the detected one of the unbalanced condition and the loss of supply.
Dependencies are inferred from the claim text.