Transformer inrush current elimination system
US7095139B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 8, 2003 |
| Grant date | Aug 22, 2006 |
| Priority date | — |
| Expiry date | Feb 24, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H9/002
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A closing phase that produces the smallest energization flux error at a connection input point is calculated based upon a residual flux of the first closing phase and the preliminarily given pre-arc characteristic and closing time deviation characteristic of a three-phase circuit breaker, so that the calculated phase value is set as a target closing phase of the first closing phase. A closing phase that produces the smallest energization flux error when a residual flux of zero is calculated, so that the calculated phase value is set as a target closing phase of the remaining two phases. The total time required from the reference point to the target closing phases of the remaining two phases and a delay time corresponding to an integer multiple of a given cycle of the three-phase power supply is set as a target closing time of the remaining two phases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.