Bus-compatible amplifier for drive of electromagnetic switchgear

摘要

The electromagnetic or electronic amplifier (60) is connected by an interface circuit (52) to bus terminals (32,34). Other connections are provided for current supply (28,30) and drive (24,26). Alarm connections (44,46) are taken to terminals of an auxiliary switching unit. The interface may be bidirectional or unidirectional and conveys signals from the bus to a selector (56), time delay circuit (58) and switching relay (60). The delay circuit has an input (68) for adjustment parameters of the amplifier, and an output (70) for status parameters.