Procedure and means for monitoring the phase sequence in a three

Details Procedure and means for monitoring the phase sequence in a three Procedure and means for monitoring the phase sequence in a three

1981-06-24

1984-10-30

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With phase sequence network analyzer

361 77, H02H 326

Patent

active

044802838

ABSTRACT:
Procedure for monitoring the phase sequence in a three-phase network, for instance in lift operation. Between the normal voltage vectors (R,S,T) indicating the phases are added extra vectors (R',S') which are mutually opposed and equal vectors, and that the extra vectors (R',S') and the voltage vectors (R,S,T) are added up and on the basis of the sum thus obtained, necessary steps are taken.

REFERENCES:
patent: 3992651 (1976-11-01), Hodges
patent: 4023075 (1977-05-01), Reuter
patent: 4067053 (1978-01-01), Chow
patent: 4210948 (1980-07-01), Waltz
patent: 4284939 (1981-08-01), Kawada et al.

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