US 11,757,282 B2
Method and device for controlling at least one circuit breaker of a power system
Michael Stanek, Gebenstorf (CH); and Soumya Kanta, Bangalore (IN)
Assigned to HITACHI ENERGY SWITZERLAND AG, Baden (CH)
Appl. No. 17/278,802
Filed by Hitachi Energy Switzerland AG, Baden (CH)
PCT Filed Sep. 24, 2019, PCT No. PCT/EP2019/075651
§ 371(c)(1), (2) Date Mar. 23, 2021,
PCT Pub. No. WO2020/064699, PCT Pub. Date Apr. 2, 2020.
Claims priority of application No. 201841036616 (IN), filed on Sep. 28, 2018; and application No. 18199596 (EP), filed on Oct. 10, 2018.
Prior Publication US 2022/0037879 A1, Feb. 3, 2022
Int. Cl. H02H 3/06 (2006.01); H02H 11/00 (2006.01); G01R 19/00 (2006.01); H02H 3/44 (2006.01)
CPC H02H 11/007 (2013.01) [G01R 19/003 (2013.01); H02H 3/066 (2013.01); H02H 3/44 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A method of controlling at least one circuit breaker of a power system, the power system further comprising a power source, a transmission line, and a voltage transformer connected to the power source and adapted to sense a source voltage of the power source, the at least one circuit breaker connected in series between the power source and the transmission line, a shunt reactor, and a current transformer connected in series between the transmission line and the shunt reactor to measure a current through the shunt reactor, the method comprising:
processing an output signal of the current transformer comprising determining a time derivative of a current sensed by the current transformer; and
performing a control operation on the at least one circuit breaker based on the determined time derivative of the current sensed by the current transformer, the control operation comprising a controlled reclosing of the circuit breaker after tripping of the circuit breaker based on an output signal of the voltage transformer and on the time derivative of the current sensed by the current transformer.