作者: Josef Dipl Ing Spindler , Herbert Dr Ing Meyer
DOI:
关键词: Short circuit 、 Constant current 、 Overcurrent 、 Current (fluid) 、 Electronic engineering 、 Electrical engineering 、 Signal 、 Engineering 、 Circuit breaker 、 Current sensor 、 Tripping
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.