Phase shifting transformer with low zero phase sequence impedance
US5801610A · kind A · utility
Inventor
Key dates
| Filing date | Apr 20, 1994 |
| Grant date | Sep 1, 1998 |
| Priority date | — |
| Expiry date | Apr 20, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F30/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A phase shifting transformer or autotransformer for a three phase power distribution network has a secondary winding including a plurality of windings distributed amongst the three core legs such that on each core leg the number of turns of windings generating a flux in the positive direction is substantially equal to the number of turns of windings generating a flux in the negative direction. Thus, according to the invention, the transformer may be provided with any necessary phase shifting angles between different harmonic sources, with outputs each having a very low zero phase sequence impedance to reduce voltage distortion created by zero phase sequence harmonics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.