Phase monitor and protection apparatus

Details Phase monitor and protection apparatus Phase monitor and protection apparatus

1995-05-11

1996-10-29

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 76, H02H 326

Patent

active

055702589

ABSTRACT:
A phase monitor and protection circuit is shown in which an impedance network (21, 23, 25) in a respective branch (20, 22, 24) connected to a neutral (26) is coupled to each phase of a three phase power supply (L1, L2, L3) to create a known voltage profile across the respective networks. A relay network (36) is coupled to one branch (20) and a control network (30) is coupled to a second branch (24) to monitor the voltage levels and deenergize the relay (R1) upon the occurrence of the reversal of any two phases or the loss of a phase. The control circuit can also be used to detect low voltage conditions and in a second embodiment provides a time delay network (44) to avoid nuisance tripping due to transient low voltage or brown out condition.

REFERENCES:
patent: 4023075 (1977-05-01), Reuter
patent: 4199798 (1980-04-01), Leppke et al.
Copending, Coassigned U.S. Patent Application Serial No. 08/176,754 filed Jan. 3, 1994 Inventor(s): William R. Manning et al. Title: Phase Sequence Wiring Protection Apparatus.

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