Device and method for detecting a neutral wire break

摘要

the invention relates to a device for recognizing a neutralleiterbruches in the inlet to a drehstromnetz (1) with phasenleitern (l1, l2, l3) and a neutralleiter (n) operated device (100), characterised by the fact that in the device, a virtual sternpunkt (2) the purpose of the triple phase conductor (l1, l2, l3) and the neutralleiters (n) (3)4, 5, 6, 7, 8, 9) is formed in the device, a measuring device (12) with a messeingang has to capture at least the messsignalverlaufs of neutralleiters (n) on mittelabgriff of the neutralleiter (n) assigned spannungsteilers (9, 10), the device a resistive un d gleichrichtende properties (abbildungsschaltung (11).in the device between the three phases (l1, l2, l3) and the neutralleiter (n) is switched, and with interruption of the neutralleiters (n) of the messsignal neutralleiters based on virtual sternpunkt is a gleichanteil.