EP 0404143 B1 19940914 - Load monitoring circuit with alternating current working in railway systems.
Title (en)
Load monitoring circuit with alternating current working in railway systems.
Title (de)
Schaltungsanordnung zur Überwachung von Wechselstromverbrauchern in Eisenbahnsignalanlagen.
Title (fr)
Circuit pour surveiller des charges à courant alternatif dans des installations de chemin de fer.
Publication
Application
Priority
DE 3920430 A 19890622
Abstract (en)
[origin: EP0404143A1] A circuit arrangement for monitoring AC loads, fed via capacitive cable feedlines, in railway signalling systems is disclosed which permits the current flow through the respective load to be reliably monitored by evaluating the current (I) fed into the cable feedline, independently of the length of the cable feedline. The current (I) flowing into the cable feedline flows through a monitoring element (G), which responds to the mean value with respect to time of the current flowing through it, only during one of the half cycles of the feed voltage (U). During the other half cycle of the feed voltage it is bypassed in a low-impedance fashion by a switch (S) controlled synchronously with the feed voltage. Since the capacitive reactive current has the mean value 0 during one half cycle of the feed voltage, the circuit arrangement detects only the real current component, which reproduces the load current, of the current fed into the cable feedline. <IMAGE>
IPC 1-7
IPC 8 full level
B61L 7/10 (2006.01); G01R 31/02 (2006.01)
CPC (source: EP)
B61L 7/10 (2013.01)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI NL SE
DOCDB simple family (publication)
EP 0404143 A1 19901227; EP 0404143 B1 19940914; AT E111405 T1 19940915; DE 3920430 A1 19910103; DE 59007106 D1 19941020; DK 0404143 T3 19941017; ES 2063863 T3 19950116
DOCDB simple family (application)
EP 90111741 A 19900621; AT 90111741 T 19900621; DE 3920430 A 19890622; DE 59007106 T 19900621; DK 90111741 T 19900621; ES 90111741 T 19900621