Method and apparatus for disconnection of a fault current which has occured in an AC power supply system
First Claim
1. A method for disconnection of a fault current (I) which has occurred in an AC power supply system, comprising:
- supplying a disconnection command, which is produced in a protective device, to a synchronization controller to open a circuit breaker;
delaying the switching command in the synchronization controller until the circuit breaker can be opened in synchronism with the power supply system;
monitoring the disconnection command emitted from the protective device and monitoring fault current, or a status signal emitted from the circuit breaker, and forming a first emergency disconnection command which acts on the circuit breaker if the fault current or the status signal is still present following a first delay time after emission of the disconnection command, which first 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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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.
29 Citations
12 Claims
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1. A method for disconnection of a fault current (I) which has occurred in an AC power supply system, comprising:
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supplying a disconnection command, which is produced in a protective device, to a synchronization controller to open a circuit breaker;
delaying the switching command in the synchronization controller until the circuit breaker can be opened in synchronism with the power supply system;
monitoring the disconnection command emitted from the protective device and monitoring fault current, or a status signal emitted from the circuit breaker, and forming a first emergency disconnection command which acts on the circuit breaker if the fault current or the status signal is still present following a first delay time after emission of the disconnection command, which first 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. - View Dependent Claims (2, 3, 4, 8, 9, 10)
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5. An apparatus for disconnection of a fault current which occurs in an AC power supply system, comprising:
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a protective device for production of a disconnection command for a circuit breaker;
a synchronization controller, which detects the disconnection command and in which the switching command is delayed until the circuit breaker can be opened in synchronism with the power supply system; and
a failure protective device which ensures disconnection of a fault current when the synchronization controller is defective, to produce a first emergency disconnection command. - View Dependent Claims (6, 7, 11, 12)
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Specification