Band-pass sequence filters for symmetrical components of multiphase AC power systems
US4479160A · kind A · utility
7Cited by
11References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 2, 1983 |
| Grant date | Oct 23, 1984 |
| Priority date | — |
| Expiry date | May 2, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R29/16
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A three-phase symmetrical component active band-pass filter includes three 120.degree. phase shift circuits which are connected in a closed loop fashion such that each phase shift circuit receives an input signal from one phase of an associated power system and a second signal from the output of one of the other phase shift circuits. A voltage tunable filter is formed by using multipliers to couple some fraction of the output of each phase shift circuit to a summing point at the input of another phase shift circuit. Phase comparators and an integrator can be added to achieve a self-tracking tuning arrangement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.