0177879-A2 is referenced by 1 patents and cites 4 patents.

A fault current protection circuit (1) with a summing current transformer (4) having two primary windings (5, 6) and one secondary winding (7) is shown and described, which circuit (1) has one trip circuit (8), which has a trip transistor (9) and two control inputs (10, 11) and is connected downstream of the secondary winding (7) of the summing current transformer (4).; In the fault current protection circuit (1) according to the invention, the response sensitivity is increased in that a rectifier circuit (12) is connected to the secondary winding (7) of the summing current transformer (4), in that the rectifier circuit (12) contains a semiconductor valve (13) and a storage or smoothing capacitor (14), in that the positive pole (15) of the rectifier circuit (12) is connected to the first control input (10) of the trip circuit (8), and in that an auxiliary impedance (17), through which an auxiliary current flows, is provided between the negative pole (16) of the rectifier circuit (12) and the second control input (11) of the trip circuit (8). The rectifier circuit (12) is preferably configured as a Villard circuit and the auxiliary impedance (17) is preferably an auxiliary diode.

Title
Circuit responsive to fault current.
Application Number
EP19850112402 19851001
Publication Number
0177879 (A2)
Application Date
October 1, 1985
Publication Date
April 16, 1986
Inventor
Kullik Guenter
DE
Hafemann Klaus
DE
Assignee
Wik Elektro Hausgeraete
DE
IPC
H02H 03/33
H02H 03/32
H02H 03/33
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