Method and apparatus for disconnection of a fault current...

Details Method and apparatus for disconnection of a fault current... Method and apparatus for disconnection of a fault current...

2006-11-06

2008-11-11

Sherry, Michael J (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

C307S143000

Reexamination Certificate

active

07450362

ABSTRACT:
A method and an apparatus are disclosed for disconnection of a fault current which has occurred in an AC power supply system. A disconnection command which is produced in a protective device is supplied to a synchronization controller in order to open a circuit breaker, in which synchronization controller a command is delayed until the circuit breaker can be opened in synchronism with the power supply system. The method includes monitoring of the disconnection command emitted from the protective device and monitoring a fault-current signal, or a status signal emitted from the circuit breaker, and formation of an emergency disconnection command if the fault-current signal or the status signal is still present following a delay time after emission of the disconnection command, which delay time is greater than a sum of a natural response time of the circuit breaker and a time for quenching of a switching arc produced on opening of the circuit breaker.

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International Preliminary Report of Patentability for PCT/CH2005/000232 dated Mar. 29, 2007.
International Search Report.

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