Current transformer
US6028422A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 19, 1999 |
| Grant date | Feb 22, 2000 |
| Priority date | — |
| Expiry date | Apr 19, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F38/32
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A current transformer for mains alternating current with dc components is formed of at least one transformer core with a primary winding and at least one secondary winding, of load resistor is connected in parallel to the secondary winding and terminates the secondary circuit in low-impedance fashion. A semiconductor component that opens during a suitable time span within every cycle and is in turn closed is provided in the secondary circuit. During this time span, the secondary circuit is in a no-load condition. As a result thereof, the build-up of the core magnetization generated by the dc components is collapsed, and thus the transformer core cannot be driven into saturation, so that an over-dimensioning of the transformer cores is unnecessary.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.