Zero phase sequence current filter with adjustable impedance
US5406437A · kind A · utility
4Cited by
13References
16Claims
0Family size
Inventor
Key dates
| Filing date | Apr 14, 1994 |
| Grant date | Apr 11, 1995 |
| Priority date | — |
| Expiry date | Apr 14, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E40/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention provides a zero phase sequence current zig-zag filter with adjustable zero phase sequence impedance and a method for adjusting the impedance of the filter. Impedance is adjusted in discrete increments by detuning the filter one phase at a time. Detuning is accomplished using taps or auxiliary windings, whereby the ratio of the effective number of turns of the first winding relative to the second winding on the same core leg is changed independently for each phase of a three phase power supply.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.