High speed protection for phase balancer with zig-zag transformer
US12266937B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 2, 2022 |
| Grant date | Apr 1, 2025 |
| Priority date | — |
| Expiry date | Nov 28, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/48
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A zero-sequence current balancer for a controlling zero-sequence current in a three-phase power system includes a zig-zag transformer coupled to the three-phase power system, an inverter coupled to an output of the zig-zag transformer, and at least one of: (i) a clamp device operating as a normally open switch, the clamp device being provided in between the output of the zig-zag transformer and a neutral conductor (which may be grounded) and being connected in parallel with the inverter, and (ii) a load-break switch provided between the output end of the zig-zag transformer and an input of inverter. A controller is structured and configured to detect a fault condition in the three-phase power system, and in response cause at least one of the closing of the clamp device or the opening of the load-break switch in order to protect the system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.