Electronic tripping device for switches (circuit breakers) which limit the short-circuit current

作者: Josef Dipl Ing Spindler , Herbert Dr Ing Meyer

DOI:

关键词: Short circuitConstant currentOvercurrentCurrent (fluid)Electronic engineeringElectrical engineeringSignalEngineeringCircuit breakerCurrent sensorTripping

摘要: Electronic overcurrent tripping devices for switches which limit the short-circuit current are intended to detect a and switch off as early possible in order protect systems be protected against excessive thermal dynamic loads. In achieve this, sensors (1, 2, 3) detecting gradient at relatively short time intervals provided each main path, measurements from digitised via analog digital converters (4, 5, 6) is calculated, downstream microprocessors or signal processors (7), by summation of products constant time. If predetermined threshold value exceeded, tripped without any delay.