US 11,774,918 B2
Electric circuit arrangement for standard insulation monitoring with emergency shut-down for an ungrounded power supply system upon detection of a ground fault
Dieter Hackl, Fernwald (DE)
Assigned to Bender GmbH & Co. KG, Gruenberg (DE)
Filed by Bender GmbH & Co. KG, Gruenberg (DE)
Filed on Jun. 1, 2022, as Appl. No. 17/829,942.
Prior Publication US 2022/0390907 A1, Dec. 8, 2022
Int. Cl. G05B 9/02 (2006.01); G01R 31/08 (2020.01)
CPC G05B 9/02 (2013.01) [G01R 31/083 (2013.01); G01R 31/088 (2013.01)] 3 Claims
OG exemplary drawing
 
1. An electric circuit arrangement (2) for standard insulation monitoring with emergency shut-down for an ungrounded power supply system (4) upon detection of a ground fault,
having a standard insulation monitoring device (10) configured in accordance with product standard IEC-61557-8 which is coupled to an active conductor (L1, L2, L3) of the power supply system (4) on the network side via a coupling branch (12) each or to a neutral point (S) of the power supply system (4) via a coupling branch (12) and is connected to ground (PE) on the ground side via a ground connection branch (14),
characterized by
an AC/DC sensitive measuring current transformer (20) which detects a fault current on the network side at the active conductors (L1, L2, L3) in the coupling branches (12) or at the neutral point (S) in the coupling branch (12) or on the ground side in the ground connection branch (14) of the insulation monitoring device (10); an evaluator (30) for evaluating the fault current with regard to a fault current thresh-old being exceeded; and a trip device (40) for shutting down the power supply system (4).