Electrical monitoring device and method for safeguarding the protective function of a type A residual current device (RCD)

摘要

A monitoring device and a method safeguards the function of a type A residual current device (RCD) in a power supply system. The monitoring device includes a measuring current transformer circuit for detecting a DC fault current (IF), an evaluation unit for processing the current detected by the measuring current transformer circuit, and a communication interface connected to the output of evaluation unit. In one embodiment, the monitoring device forms part of an electrical protection device with a type A residual current device (RCD) for ensuring the function of the type A residual current device (RCD).

主权项

1. An electrical protection device comprising:
a type A residual current device (RCD) in an electricity supply system; a monitoring device safeguarding the function of the type A residual current device (RCD), the monitoring device being connected in series to the type A residual current device (RCD), said monitoring device comprising: a measuring current transformer circuit detecting a DC fault current (IF) that impairs the function of the type A residual current device (RCD); an evaluation unit processing the current detected by the measuring current transformer circuit; a communication interface connected to an output of the evaluation unit; and a separate shutoff device shutting off a faulty outgoing power feed.