公开(公告)号：DE102004021978A1

公开(公告)日：2005-11-24

申请号：DE102004021978

申请日：2004-05-04

Applicant: ABB TECHNOLOGY AG ZUERICH

Inventor： MUELLER LORENZ ,  STANEK MICHAEL

IPC: H01H9/56 ,  H01H33/00 ,  H01H47/00 ,  H02H3/05 ,  H01H71/74

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.

公开(公告)号：DE50201990D1

公开(公告)日：2005-02-17

申请号：DE50201990

申请日：2002-04-05

Applicant: ABB TECHNOLOGY AG ZUERICH

Inventor： STANEK MICHAEL

IPC: H01H33/44 ,  H01H9/56 ,  H02J3/04

Abstract: In addition to measuring current flowing through the power circuit breaker (9), and the voltage on one side, an additional voltage measurement is taken on the other side. All measured signals are fed into a controller (18). There, with stored data characterizing all possible switching cases, it is determined which measurement signal shall be taken as the reference value for operation of the power circuit breaker, in synchronism with the grid. A corresponding command is generated by the controller, and executed by the power circuit breaker. An Independent claim is included for corresponding equipment which includes an additional voltage transformer to make the measurement on the other side of the power circuit breaker.