Electricity: electrical systems and devices – Safety and protection of systems and devices – With phase sequence network analyzer
Patent
1976-03-25
1977-11-29
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With phase sequence network analyzer
361 89, 361 92, H02H 324
Patent
active
040608433
ABSTRACT:
A protection circuit for use with circuit breakers for electrical apparatus operated by multiple phase, alternating current power systems characterized by a plurality of electrical distribution lines for transmitting electrical energy, with the electrical energy in the lines having a spaced phase relationship. The protection circuit includes a first sensor coupled to the lines for detecting an undesirable phase imbalance between two or more of the lines, and for detecting a low voltage on one or more of the lines, and initiating a first signal responsive to either or both of these conditions. The protection circuit also includes a second sensor coupled to the lines for detecting a phase reversal between two or more of the lines and initiating a second signal responsive thereto. A circuit breaker operating circuit is coupled to the second sensor for operating the circuit breaker responsive to the second signal. Time delay circuitry is coupled between the first sensor and the circuit breaker operating circuit for initiating the second signal responsive to the first signal being received thereby for a predetermined period of time. An over-voltage sensor is also coupled to at least one of the lines for detecting an over-voltage condition thereon and initiating the second signal responsive thereto, with the second signal being coupled to the circuit breaker operating circuit for activation thereof.
REFERENCES:
patent: 2486305 (1949-10-01), Mahnke
patent: 3156848 (1964-11-01), Wood
patent: 3535591 (1970-10-01), Holmquest
patent: 3743889 (1973-07-01), Lopez-Batiz
patent: 3875463 (1975-04-01), Reuter et al.
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