Method and apparatus for disconnection of a fault current which has occurred 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 disconnecting command in the synchronization controller until the circuit breaker can be opened in synchronism with the AC 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, andforming 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 the supplying 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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Accused Products
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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Citations
11 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 disconnecting command in the synchronization controller until the circuit breaker can be opened in synchronism with the AC 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 the supplying 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, 7, 8, 9, 10, 11)
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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 disconnected 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, wherein the failure protective device comprises; a first protective apparatus comprising; a first input for detection of the disconnection command; a second input for detection of a fault-current signal or of a status signal; a first delay element, which is connected downstream from the first input and has a first delay time which is areater than the sum of the natural response time of the circuit breaker and the time for quenching of a switching arc which can be produced on opening of the circuit breaker; a first AND element which logically links the delayed disconnection command and the fault-current signal or the status signal (S) with one another; and a first input which acts on the circuit breaker and at which the first emergency disconnection command is present once the first delay time has elapsed. - View Dependent Claims (6)
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Specification