Electrical transmission or interconnection systems – Switching systems – Condition responsive
Reexamination Certificate
2003-03-24
2009-12-01
Fleming, Fritz M (Department: 2836)
Electrical transmission or interconnection systems
Switching systems
Condition responsive
C307S131000, C361S001000, C361S002000, C361S003000, C361S005000, C361S006000, C361S007000
Reexamination Certificate
active
07626286
ABSTRACT:
The method for mains-synchronous switching of circuit breakers comprises the following method steps: measurement of the current flowing through a circuit breaker (9) and measurement of a mains voltage on a first side of the circuit breaker (9), additional voltage measurement on a second side of the circuit breaker (9), feeding of all the measurement signals to a control device (18), deciding in the control device (18), on the basis of the characteristic data stored there, which measurement signal will be used as the reference value for the mains-synchronous tripping of the circuit breaker (9), generating a switching command, which initiates the mains-synchronous switching of the circuit breaker (9) on the basis of this decision, and carrying out the switching command by the circuit breaker (9).
REFERENCES:
patent: 5563459 (1996-10-01), Kurosawa et al.
patent: 6282499 (2001-08-01), Andersen
patent: 6845020 (2005-01-01), Deng et al.
patent: 2003/0015977 (2003-01-01), Lee et al.
patent: 1565995 (1970-06-01), None
ABB Technology AG
Buchanan & Ingersoll & Rooney PC
Fleming Fritz M
Parries Dru M
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