Magnetizing inrush restraint method and relay for protection of power transformers
US6483680B1 · kind B1 · utility
14Cited by
18References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 21, 2000 |
| Grant date | Nov 19, 2002 |
| Priority date | — |
| Expiry date | Apr 30, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/0455
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and relay for magnetizing inrush restraint in protective relays for power transformers. The method utilizes the phase angle relation between the fundamental component and the second harmonic in addition to the magnitude ratio. This is accomplished by calculating and utilizing the complex second harmonic ratio. The specially shaped operating characteristic for the complex second harmonic ratio is made dynamic providing for better security without jeopardizing dependability of the transformer protective relay.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.