Global patent index - EP 0694937 B1

EP 0694937 B1 2000-03-29 - Method and apparatus for determining the residual life of contacts in switching devices

Title (en)

Method and apparatus for determining the residual life of contacts in switching devices

Title (de)

Verfahren zur Bestimmung der Restlebensdauer von Kontakten in Schaltgeräten und zugehörige Anordnung

Title (fr)

Procédé et dispositif pour déterminer la vie résiduelle de contacts dans les appareils de commutation

Publication

EP 0694937 B1 (DE)

Application

EP 95111202 A

Priority

DE 4427006 A

Abstract (en)

[origin: EP0694937A2] The opening time of the main contacts is measured by rectification and limiting of the circuit-breaking arc voltage in a circuit contg. an opto-coupler with a DC source and measuring resistance. The time signals (t0,t1) are applied to a controller (40) which also records the elapsed operating time (T), the number of switching operations (N) and an averaged time difference (t1 minus t0) over a given number of cycles. The measurements and evaluated quantities are stored in non-volatile memory (41) and displayed (45). <IMAGE>

IPC 1-7 (main, further and additional classification)

H01H 1/00

IPC 8 full level (invention and additional information)

H01H 1/00 (2006.01); H01H 3/00 (2006.01)

CPC (invention and additional information)

H01H 1/0015 (2013.01); H01H 3/001 (2013.01); H01H 2071/044 (2013.01)

Designated contracting state (EPC)

CH DE ES FR IT LI SE

EPO simple patent family

EP 0694937 A2 19960131; EP 0694937 A3 19970813; EP 0694937 B1 20000329; DE 4427006 A1 19960201; ES 2145185 T3 20000701

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