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1. (WO1999008301) METHOD FOR DETERMINING SWITCHGEAR-RELATED DATA IN SWITCHGEAR CONTACTS AND/OR OPERATION-RELATED DATA IN A CONNECTED NETWORK

Pub. No.:    WO/1999/008301    International Application No.:    PCT/DE1998/002247
Publication Date: Fri Feb 19 00:59:59 CET 1999 International Filing Date: Thu Aug 06 01:59:59 CEST 1998
IPC: H01H 1/00
Applicants: SIEMENS AKTIENGESELLSCHAFT
POHL, Fritz
ELSNER, Norbert
Inventors: POHL, Fritz
ELSNER, Norbert
Title: METHOD FOR DETERMINING SWITCHGEAR-RELATED DATA IN SWITCHGEAR CONTACTS AND/OR OPERATION-RELATED DATA IN A CONNECTED NETWORK
Abstract:
The invention relates to a method in which the contact spring action at the break is detected, in particular for earthing contacts, as a replacement criterion for the erosion of contacts. Erosion can be determined by measuring the change in contact spring action during the switching off process, and converted to give the residual life of the contacts. This requires precise measurement of the armature path from the beginning of the armature movement to the beginning of the contact opening. In accordance with the invention, the switching conditions in the switchgear and in the electric network can also be detected from the signals used for determining the contact spring action.