Protection device of the electrical device against voltage drop or power failure in the power distribution network

摘要

The invention relates to a system (1) for protecting an electrical device (10) from a power failure or voltage drop in the power distribution network, which is connected between the mains connection (3) and the power line (11) to the electrical device (10), and a reserve power source (2 ), the system further comprising an electrical circuit unit (8) with an inverter (9), a thyristor switching unit (5) for switching the power supply of the electrical device (10) from the power distribution network to the reserve power source (2) and vice versa, a measuring and evaluation unit (7) for measuring the failure or decline of the voltage and / or the current at the mains connection (3), and a control unit (4), and wherein the reserve current source (2) consists of an assembly of supercapacitors (12) consists.