Electrical circuit arrangement and method for coupling an insulation monitoring device to an unearthed power supply system

摘要

The invention relates to an electrical circuit arrangement and a method for coupling an insulation monitoring device to an ungrounded power supply system via an effective for each active conductor of the power supply system, formed as ohmic resistance circuit Ankoppelimpedanz, wherein the ohmic resistance circuit has an adjustable variable resistance value and a shutdown for network decoupling of the insulation monitoring device and as a bidirectional cascade, consisting of a series connection of two mirror-inverted transistors, each with a parallel diode is formed, wherein for adjusting the variable resistance value, a controlled change in resistance of the transistors is effected by a control circuit and the Abschaltfunktion is performed for network decoupling by setting a maximum resistance value ,