Active symmetrical component sequence filter

Details Active symmetrical component sequence filter Active symmetrical component sequence filter

1976-06-03

1978-01-03

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

With phase sequence network analyzer

361 77, H02H 326

Patent

active

040670538

ABSTRACT:
A filter, energized by a polyphase power source, is adapted to detect positive or negative sequence components present in the source. Means are provided for summing a first phase quantity with a second phase quantity which has been shifted by 180 electrical degrees. Additional means are utilized to phase shift the summed resultant itself by 120 electrical degrees and to sum the phase shifted resultant with the phase shifted second quantity and a third quantity. The second summation yields an output quantity proportional to only one of the sequence components, if any, present in the polyphase source.

REFERENCES:
patent: 2854632 (1958-09-01), Lode
patent: 3154737 (1964-10-01), Hodges
patent: 3699441 (1972-10-01), Linders
patent: 3938006 (1976-02-01), Gadwal et al.
patent: 3947728 (1976-03-01), Smith

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