Integral current transformer shunt resistor
US8315022B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 2010 |
| Grant date | Nov 20, 2012 |
| Priority date | — |
| Expiry date | Apr 19, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H3/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electrical power system may comprise a power source, an electrical load and an interconnection path between the power source and the electrical load. At least one power-source current transformer may be positioned at the power source. At least one remote current transformer may be positioned remotely from the power-source current transformer so that a portion of the interconnection path is between the power-source and the remote current transformer. A control circuit may be interposed between the power-source and remote current transformers and may be responsive to current imbalance between the power-source and remote current transformers to disconnect the power source from the electrical load in the event of such imbalance. The at least one power-source current transformer may comprise a secondary winding having first and second ends, and a resistor connected across the first and second ends. This resistor may provide a path for current transformer secondary current to flow in the event of an open circuit failure in the control circuit or the interconnection path between the current transformer and the control circuit. Consequently voltage across the current transformer seconda…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.